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1. 3 Select EXHAUST SOLENOID in Active Test E SUS 4 Touch 5 While operating test item check voltage between air compressor harness connector and ground Air compressor Voltage Connector Terminal C12 4 Ground 9 16V Is the inspection result normal YES gt gt GOTO4 NO gt gt GO TO 2 2 CHECK HARNESS BETWEEN AIR LEVELIZER CONTROL MODULE AND AIR COMPRESSOR 1 Turn ignition switch OFF 2 Disconnect air levelizer control module harness connector Revision 2010 May SCS 74 2011 QX56 C1803 AIR SUSPENSION SOL lt DTC CIRCUIT DIAGNOSIS gt AIR LEVELIZER CONTROL SYSTEM 3 Check continuity between air levelizer control module harness connector and air compressor harness connector Air levelizer control module Air compressor Continuity Connector Terminal Connector Terminal B84 11 C12 4 Existed 4 Check continuity between air levelizer control module harness connector and ground Air levelizer control module Continuity Connector Terminal B84 11 Ground Not existed Are the inspection results normal YES gt gt GOTO3 gt gt Repair or replace damaged part 3 CHECK INTERMITTENT INCIDENT Refer to 40 Intermittent Incident Is the inspection result normal YES gt gt Replace the air levelizer control module Refer to SCS 94 Removal and Installation NO Repair or replace damaged parts 4 CHECK AIR COMPRESSO
2. TOI 40329uuo SOS 3 11 E zio ew oreuon jeusis jeune ws ost vr ADIWSOMM HN MW9IHL ed YIM OL OL swen IN31SAS 1OHINOO H3ZI TA JCEWMO221GB 2011 QX56 SCS 62 2010 May ision Rev AIR LEVELIZER CONTROL SYSTEM AIR LEVELIZER CONTROL SYSTEM YOLOANNOO ANN 1 4 ON 403000 lt WIRING DIAGRAM gt 21 490 1 ed 4035 09 wood ANIONI FINGON INSOTTTLND 00646 757 AV T3H HOSS3HdWOO 104 9 4039euuo STNGOW NOLLNSIYLSIG 1N3OTTT3LNI Y 3 edA 1049 05 4 s M 94M uorjeoyioeds eue euis ido 3naow NOLINGRULSIO 1N39rri31ND OL 1 O1 IN31SAS 1041 09 JCEWM0222GB 2011 QX56 SCS
3. 29 iiis een etie Re 7 DIFFERENCE IN APPEARANCE 29 COMPONENT PARTS 8 AE d PT 29 Component Parts Location 8 nspection Procedure 29 Component Description 8 LARGE ROLL ANGLE e 30 STRUCTURE AND OPERATION NEAR ER TA 9 2 NES E rada DuC Hydraulic Body Motion Control System 9 nspection Procedure SM ADbSOTDOE tete edt deiode 3 REMOVAL AND INSTALLATION 31 11 HYDRAULIC BODY MOTION CONTROL PPM Pipe 11 eer c 31 SYSTEM d ee le Atte System 12 FRONT TUBE ASSEMBLY 31 System Description 1 12 FRONT TUBE ASSEMBLY Exploded View 32 Component Description 22 14 FRONT TUBE ASSEMBLY Removal and Instal PEE 32 BASIC INSPECTION BERR RRR RRR 15 FRONT TUBE ASSEMBLY x Inspection ta hoe 34 Revision 2010 May SCS 1 2011 QX56 ACCUMULATOR 34 ECU DIAGNOSIS INFORMATION 58 ACCUMULATOR Exploded View 35 ACCUMU
4. If malfunction is detected the system enters fail safe mode Refer to SCS 59 Fail safe INPUT OUTPUT SIGNAL Air levelizer control module transmits and receives following signals between each control unit via CAN com munication line Component parts Control signal Transmits the following signal via CAN communication line to air levelizer control module EOM Engine speed signal Receives the following signal via CAN communication line from air levelizer control module Combination meter POM CK SUSP indicator lamp signal ABS actuator and electric unit con Transmits the following signal via CAN communication line to air levelizer control module trol unit Vehicle speed signal OPERATING PRINCIPLE System Time Table Revision 2010 May SCS 54 2011 QX56 SYSTEM lt SYSTEM DESCRIPTION gt AIR LEVELIZER CONTROL SYSTEM 0 59 in 1mm 0 04 in Standard vehicle height position Vehicle height 0 04 in 0 59 in Air compressor ON p OFF i 30sec _ ON J Exhaust solenoid OFF i JSEIA0221GB Vehicle height raises When starting engine if vehicle height of vehicle rear continues for 30 seconds or more in a status that is 15 mm 0 59 in or less than standard vehicle height 1 Vehicle height sensor detects vehicle height status and transmits this information to air levelizer control module Air levelizer control module turns air compressor relay ON
5. Install protector of PPMU Refer to SCS 39 PPMU MIDDLE TUBE ASSEMBLY PPMU PIPE Exploded View JSEIA0193ZZ Revision 2010 May SCS 19 2011 QX56 CHECK INTERNAL LEAKAGE lt BASIC INSPECTION gt HBMC CHECK INTERNAL LEAKAGE Work Procedure INFOID 0000000006256012 CAUTION Clean surrounding areas of oil injection jack using steam before starting operation since there be mud on it Clean oil pressure gauge special service tool KV40108000 jack with steam before use 1 Remove protector of PPMU 2 Remove cap of oil injection jack 3 Install an oil pressure gauge SST KV40108000 A to oil injec tion jack CAUTION Jack must be securely inserted until a click sound can be heard Pressure reducing valve of the oil pressure gauge must be closed JSEIA01862Z 4 Loosen needle valves A C and E of PPMU by approximately 2 rotations CAUTION Never loosen the needle valve more than required 5 Lift up the vehicle CAUTION Check that tires never contact the ground 6 Tighten needle valves C and E of PPMU 7 Loosen lock nut of needle valve D of PPMU and then tighten needle valve D 8 Lift down the vehicle CAUTION Check that the lift is fully lowered 9 Write down a value of the oil pressure gauge after 5 minutes 10 Tighten needle valve A of PPMU 11 Loosen lock nut of needle valve B of PPMU and then tighten needle valve B 12 Loosen needle valve C of PPMU by approx
6. Remove PPMU pipe A from left side middle joint Remove PPMU pipe B from right side middle joint Separate chassis and body Refer to DLK 251 Removal and Installation Remove PPMU pipe B from the vehicle Perform inspection after removal Refer to SCS 43 PPMU MIDDLE TUBE ASSEMBLY PPMU PIPE Inspection 9x gy d Qo wi ct Revision 2010 May SCS 41 2011 QX56 HYDRAULIC BODY MOTION CONTROL SYSTEM lt REMOVAL AND INSTALLATION gt HBMC INSTALLATION PPMU Note the following and install in the reverse order of removal Check connection portion of each piping for dirt or dust Completely engage hooks of bracket on frame when installing PPMU JSEIA0211ZZ Middle Tube Assembly LH from Rear Shock Absorber LH Upper to Left Side Middle Joint Note the following and install in the reverse order of removal Apply genuine NISSAN hydraulic suspension fluid to O ring Check connection portion of each piping for dirt or dust For tightening torque for pipe of rear tube assembly B refer to SCS 44 REAR TUBE ASSEMBLY Exploded View For tightening torque for pipe of accumulator assembly LH refer to SCS 35 ACCUMULATOR Exploded View Completely insert guide A to guide hole on frame when installing left side middle joint JSEIA0215Z2Z Middle Tube Assembly RH from Rear Shock Absorber RH Upper to Right Side Middle Joint O ring must be free of scratches and damage
7. 4 Separate chassis and body Refer to DLK 251 Removal and Installation 5 Remove mounting bolts of each bracket 6 Remove mounting bolts of accumulator assembly LH WARNING Never remove mounting bolts of protector 7 Remove accumulator assembly LH from the vehicle 8 Perform inspection after removal Refer to SCS 38 ACCUMU LATOR Inspection Accumulator Assembly RH WARNING Revision 2010 May SCS 36 2011 QX56 HYDRAULIC BODY MOTION CONTROL SYSTEM lt REMOVAL AND INSTALLATION gt HBMC Never remove mounting bolts of protector 54 NEVER REMOVE THESE BOLTS 1 Reduce system pressure Refer to SCS 17 Work Procedure 2 Disconnect pipe A of accumulator assembly RH from right side 3 way B 3 Remove pipe A of accumulator assembly RH from right side middle joint B 4 Separate chassis and body Refer to DLK 251 Removal and Installation 5 Remove mounting bolts of each bracket 6 Remove mounting bolts of accumulator assembly RH WARNING Never remove mounting bolts of protector 7 Remove accumulator assembly RH from the vehicle 8 Perform inspection after removal Refer to SCS 38 ACCUMU LATOR Inspection INSTALLATION Note the following and install in the reverse order of removal Apply genuine NISSAN hydraulic suspension fluid to O ring Check connection portion of each piping for dirt or dust Revision 2010 May SCS 37 2011 QX56 HYDRAULIC
8. lt SYMPTOM DIAGNOSIS gt AIR LEVELIZER CONTROL SYSTEM CK SUSP INDICATOR LAMP DOES NOT TURN OFF Description INFOID 0000000006256096 CK SUSP indicator lamp turns ON while driving the vehicle CK SUSP indicator lamp does not turn ON after the completion of standard vehicle height setting Diagnosis Procedure INFOID 0000000006256097 1 STANDARD VEHICLE HEIGHT SETTING Perform STANDARD VEHICLE HEIGHT SETTING Refer to SCS 67 Work Procedure Does CK SUSP indicator lamp turn OFF YES gt gt INSPECTION END NO Replace the air levelizer control module Refer to SCS 94 Removal and Installation Revision 2010 May SCS 93 2011 QX56 LEVELIZER CONTROL MODULE lt REMOVAL AND INSTALLATION gt AIR LEVELIZER CONTROL SYSTEM REMOVAL AND INSTALLATION AIR LEVELIZER CONTROL MODULE E X p od ed V ew INFOID 0000000006256098 JSEIA0237GB 1 Air levelizer control module lt u Vehicle front Refer to Gl 4 Components for symbols not described on the above oval a n d n stal lat n INFOID 0000000006256099 REMOVAL CAUTION Never impact on air levelizer control module when removing or installing air levelizer control module 1 Disconnect battery cable from negative terminal 2 Remove luggage side lower finisher LH Refer to INT 33 Exploded View 3 Disconnect air levelizer control module harness connector 4 Remove air levelizer control module INSTALLATION I
9. CAUTION Be careful since oil drains swiftly from oil drain hole 26 Check that reading of oil pressure gauge is 0 MPa 27 Remove oil pressure gauge 28 Tighten needle valves A C and E of PPMU to the specified torque fg 8 3 0 85 kg m 73 in Ib Revision 2010 May SCS 28 2011 QX56 DIFFERENCE APPEARANCE lt SYMPTOM DIAGNOSIS gt HBMC SYMPTOM DIAGNOSIS DIFFERENCE IN APPEARANCE Description INFOID 0000000006256016 While the vehicle is stopped the difference of vehicle height of right side and left side between wheel center and wheel arch is 25 mm 0 98 in or more Inspection Procedure inFo10 0000000006256017 1 APPEARANCE 1 Visually check that the exterior parts e g suspension spring have no malfunctions 2 Visually check tube and pipe for crush or oil leakage Is the check result normal YES gt gt 2 NO gt gt Repair or replace damaged parts 2 CLOGGING OF ORIFICE IN PPMU 1 Install an oil pressure gauge SST KV40108000 A to oil injec tion jack CAUTION Clean surrounding areas of oil injection jack using steam before starting operation since there may be mud on it e Clean oil pressure gauge special service tool KV40108000 jack with steam before use Jack must be securely inserted until a click sound can be heard Pressure reducing valve B of the oil pressure gauge must be closed JSEIA0186ZZ 2 Loosen nee
10. YES gt gt GOTO2 NO Repaire or replace damaged parts 2 CHECK VEHICLE HEIGHT SENSOR Check the vehicle height sensor Refer to SCS 70 Component Inspection 15 the inspection result normal YES gt gt Check intermittent incident Refer to GI 40 Intermittent Incident NO Replace the vehicle height sensor Refer to SCS 98 Removal and Installation Revision 2010 May SCS 81 2011 QX56 C1807 VHCL HEIGHT SEN VOLT lt DTC CIRCUIT DIAGNOSIS gt AIR LEVELIZER CONTROL SYSTEM C1807 VHCL HEIGHT SEN VOLT DTC Logic INFOID 0000000006256078 DTC DETECTION LOGIC DTC Display item Malfunction detected condition Possible cause The sensor power supply is more than 5 5 V or less than 4 5 V continuously for 20 seconds when the ig nition switch is ON Harness or connector C1807 VHCL HEIGHT SEN VOLT Vehicle height sensor Sensor power supply is 0 5 V or more continuously for Air leyelizer control module 1 second during 2 seconds after turning ON the igni tion switch DTC CONFIRMATION PROCEDURE 1 PRECONDITIONING If CONFIRMATION PROCEDURE has been previously conducted always turn ignition switch OFF andwait at least 10 seconds before conducting the next test gt gt GO TO 2 2 CHECK DTC DETECTION A With CONSULT III 1 Turn ignition switch ON and wait 20 seconds or more 2 Perform Self Diagnostic Results in E SUS Is C1807 detected YES gt gt Go
11. PRECAUTIONS aisi cds tcn co 22 Precaution for Supplemental Restraint System Diagnosis Procedure 69 SRS AIR and SEAT BELT PRE TEN Component Inspection 70 SIONER 47 Precaution Necessary for Steering Wheel Rota C1802 AIR SUS COMPRS RELAY 72 tion after Battery Disconnect 47 DING LOGIC UI 72 Precaution for Procedure without Cowl Cover 48 Diagnosis Procedure 72 Precaution for Air Levelizer Control System 48 C1803 AIR SUSPENSION SOL 74 SYSTEM DESCRIPTION 49 DTO esatta ba a c SS OM Uu 74 Diagnosis Procedure 74 DESCHIPTION 26r 49 Component Inspection 75 D eseriptiori ceci eene eite epe gg 49 C1804 VHCL HEIGHT ADJ UP 77 COMPONENT PARTS MEME uot LU 77 Component Parts Location 50 Diagnosis Procedure 77 Component DeSCHDLIOTI 50 Component Inspection Air Compressor Relay 79 Air Levelizer Control Module 51 Component Inspection Air Compressor
12. Remove the exhaust tube from air compressor Remove the air compressor from bracket Rmove the bracket from vehicle 0 Remove the air tube A and B from rear shock absorbers RH and LH according to the procedure in step 4 11 Remove the air tube A and B from vehicle 12 Perform inspection after removal Rfer to SCS 97 Inspection JSEIA02392Z INSTALLATION Note the following and install in the reverse order of the removal When installing air tube 1 to air compressor or shock absorber insert as shown in the figure Dry each component thoroughly before installing to prevent mois ture from entering air compressor JSEIA0240GB Revision 2010 May SCS 96 2011 QX56 AIR COMPRESSOR AIR TUBE lt REMOVAL AND INSTALLATION gt __ AIR LEVELIZER CONTROL SYSTEM Completely engage hooks on frame when installing bracket 8 1 024122 Install exhaust tube 1 according to the figure Perform inspection after installation Rfer to SCS 97 Inspection JSEIA0242ZZ n S p e ct n INFOID 0000000006256103 INSPECTION AFTER REMOVAL Check area 8 mm 0 31 in from front end of air tubes for damage and burrs INSPECTION AFTER INSTALLATION Lightly pull air tubes and check that it is locked Apply some soapy water to each joint Check that there is no leakage of air after the activation of the air compressor during Active Test of CONSULT III CAUTION Never allow soa
13. for example over laden conditions when elec tronic circuit is normal In this case always check that the system returns to normal by starting engine after unloading load DTC Inspection Priority Chart INFOID 0000000006256065 If some DTCs are displayed at the same time perform inspections one by one based on the following priority chart Priority Detected items DTC U1000 CAN COMM CIRCUIT U1010 CONTROL UNIT CAN e 1801 VHCL HEIGHT SENSOR C1802 AIR SUS COMPRS RELAY 2 e C1803 AIR SUS EXH SOL e 1806 VHCL HEIGHT SEN FIX C1807 VHCL HEIGHT SEN VOLT e C1804 VHCL HEIGHT ADJ UP 3 C1805 VHCL HEIGHT ADJ DOWN e 1808 AIR SUS COMPRS 1 D n d ex INFOID 0000000006256056 DTC CONSULT III display Reference page C1801 VHCL HEIGHT SENSOR SCS 69 C1802 AIR SUS COMPRS RELAY SCS 72 C1803 AIR SUS EXH SOL SCS 74 C1804 VHCL HEIGHT ADJ UP SCS 77 C1805 VHCL HEIGHT ADJ DOWN SCS 80 C1806 VHCL HEIGHT SEN FIX SCS 81 C1807 VHCL HEIGHT SEN VOLT SCS 82 C1808 AIR SUS COMPRS FNCTN SCS 84 Revision 2010 May SCS 59 2011 QX56 AIR LEVELIZER CONTROL MODULE lt ECU DIAGNOSIS INFORMATION gt AIR LEVELIZER CONTROL SYSTEM U1000 CAN COMM CIRCUIT SCS 87 U1010 CONTROL UNIT CAN SCS 88 Revision 2010 May SCS 60 2011 QX56 INFOID 0000000006256057 AIR LEVELIZER CONTROL SYSTEM AIR LEVELIZER CONTROL SYSTEM AIR LEVELIZER CONTROL SYSTEM Wiri
14. gt HBMC SYSTEM DESCRIPTION DESCRIPTION D e 5 C ri pt n INFOID 0000000006255998 Hydraulic body motion control system is adopted which makes shock absorber stroke appropriately by hydraulic pressure according to driving scenes The adoption of this system allows the reduction in a roll angle i e vehicle body tilt angle at cornering to improve steering stability and ride quality during travel on level roads Furthermore the use of this system improves the running performance on rough roads by shock absorption and quality tire adhesion through maximized stroke Revision 2010 May SCS 7 2011 QX56 COMPONENT PARTS lt SYSTEM DESCRIPTION gt HBMC COMPONENT PARTS Component Parts Location INFOID 000000000625569 JSEIA0228ZZ 1 Middle tube assembly RH 2 Accumulator assembly RH 3 Front tube assembly 4 Front tube assembly B 5 Accumulator assembly LH 6 PPMU pipe 7 PPMU assembly 8 Middle tube assembly LH 9 PPMU pipe 10 Rear tube assembly 11 Rear tube assembly B lt Vehicle front Component Description INFo10 0000000006256000 Component parts Reference Shock absorber SCS 9 Shock Absorber Accumulator SCS 11 Accumulator PPMU SCS 10 PPMU PPMU pipe A SCS 11 PPMU Pipe PPMU pipe B Revision 2010 May SCS 8 2011 QX56 STRUCTURE AND OPERATION lt SYSTEM DESCRIPTION gt HBMC STRUCTURE AND OPERATION Hydraulic Body Motion Control System InFo10 000000000
15. 63 2010 May ision Rev AIR LEVELIZER CONTROL SYSTEM AIR LEVELIZER CONTROL SYSTEM 15 IAOW IVNSIS 1 6 SGOW TWNOIS NMOG 1514 3GOW IVNSIS TYNNYW NON TWNDIS 1148 193 355 4 1 9 9 3015 TWNOIS HOLIMS 3WONA 1138 1735 8 0 se 5 HOSN3S 13A31 1313 aaa vt WNDIS IAOW MONS ce 351 4 8 WNDIS 03345 3 10IH3A 1 a ANNOYS HOSN3S LN3ISAV 8 o TYN IS NoLLIND0038 ony M A er TVNOSIS HOSN3S LNAIGNY ww PIS Ova wiv wu IVNSIS HOLIMS TOYLNOO Y vr IVNSIS HOLIMS 1OH1NOO NOLLvNIAn TU er IVNSIS HO LIMS 193735 20 1 227 7VNDIS HO LIMS YILNI n TVNOSIS HOLIMS L3S34 did va 8 SGOWMOL af oom 5 Ja fe sS PWNS IS NOLLINDI uo 2 H3MOd AH3LLVG A ord eam owen 8 5 JCEWMO223GB 2011 QX56 SCS 64 HN MdziHi 10399uu00 HN MSOPHL _ edA AVM3IVO NVO 4 W313WN NOLLVNIHWOO lt WIRING DIAGRAM gt WALSAS 1034409 H3ZTT3A31 2010 ision Rev DIAGNOSIS AND REPAIR WO
16. 79 Vehicle Height Sensor 51 rapi o UR T V 51 C1805 VHCL HEIGHT ADJ DOWN 80 Air Compressor Relay 51 DIG 80 CK SUSP Indicator Lamp 51 Diagnosis Procedure 80 STRUCTURE AND OPERATION 52 C1806 VHCL HEIGHT SEN FIX 81 Rear Shock Absorber 52 on ee cdi aes 81 Vehicle Height Sensor 53 Diagnosis Procedure 81 SYSTEM 54 1807 VHCL HEIGHT SEN VOLT 82 System Diagram 2 54 orte ertt 82 System Description sss 54 Diagnosis Procedure 82 Fallsate eben 55 C1808 SUS COMPRS FNCTN 84 DIAGNOSIS SYSTEM AIR LEVELIZER DTG bogic hera e eme ite ene 84 CONTROL MODULE 56 Diagnosis Procedure 84 CONSULT II Function 2 8 56 U1000 CAN COMM CIRCUIL 8 Revision 2010 May 5 5 2 2011 QX56 Description DTC Logic Diagnosis Procedure U1010 CONTROL UNIT CAN D
17. Apply genuine NISSAN hydraulic suspension fluid to O ring Check connection portion of each piping for dirt or dust For tightening torque for pipe of rear tube assembly A refer to SCS 44 TUBE ASSEMBLY Exploded View For tightening torque for pipe of accumulator assembly RH refer to SCS 35 ACCUMULATOR Exploded View Completely insert guide A to guide hole on frame when installing right side middle joint JSEIA0215Z2Z PPMU pipe A and PPMU pipe B Install in the reverse order of removal Revision 2010 May SCS 42 2011 QX56 HYDRAULIC BODY MOTION CONTROL SYSTEM lt REMOVAL AND INSTALLATION gt HBMC PPMU MIDDLE TUBE ASSEMBLY PPMU PIPE Inspection INSPECTION AFTER REMOVAL O ring must be free of scratches and damage Pipe and tube must be free of scratches and damage INSPECTION AFTER INSTALLATION Check oil leakage twists deformation contact with other parts and loose connections ADJUSTMENT AFTER INSTALLATION Perform air bleeding Refer to SCS 18 Work Procedure PPMU MIDDLE TUBE ASSEMBLY PPMU PIPE Disposal INFOID 0000000006256031 CAUTION Always wear safety goggles Always wear safety gloves Be careful since pressure is higher when temperature is high Be careful since metal shavings or oil may be blown away by compressed gas Discard drained oil in accordance with local laws and regulations WORK PROCEDURE 1 Remove both tanks using an oil filter wre
18. COMPONENT PARTS lt SYSTEM DESCRIPTION gt AIR LEVELIZER CONTROL SYSTEM Component parts Reference Air compressor relay SCS 51 Air Compressor Relay CK SUSP indicator lamp SCS 51 CK SUSP Indicator Lamp Air Levelizer Control Module INFOID 0000000006256042 Operates ON OFF of air compressor exhaust solenoid according to signal from vehicle height sensor Transmits CK SUSP indicator lamp signal to the combination meter via CAN communication when setting of standard vehicle height is incomplete If malfunction is detected the system enters fail safe mode Refer to SCS 59 Fail safe Vehicle Height Sensor INFOID 0000000006256045 Measures vehicle height of vehicle rear and transmits this information to air levelizer control module according to electric signal Air Compressor INFOID 0000000006255044 SCS Operates according to signal from air levelizer control module via air compressor relay and charges air in air chamber of rear shock absorber EXHAUST SOLENOID Operates according to signal from air levelizer control module and discharges air in air chamber of rear shock absorber Air Compressor Relay inFo10 0900000006256045 Turns ON according to signal from air levelizer control module and operates air compressor 5 U 5 INFOID 0000000006256046 Turns ON for 2 seconds when ignition switch is turned ON for the purpose of bulb check Turns ON when se
19. adjust ment can be checked by the CK SUSP indicator lamp OFF condition Does CK SUSP indicator lamp turn OFF YES gt gt gt gt Perform step 1 again 3 ADJUST VEHICLE HEIGHT E With CONSULT III Lift down the vehicle CAUTION Check that the lift is fully lowered Select STANDARD HEIGHT LEVEL in Work Support in E SUS Touch Start Touch Revert and wait 120 seconds or more Although CONSULT III continues indicating EXECUTING select VHCL HGT CNVSN VL in Data Mon itor in E SUS Is value within 15 15 mm YES gt gt 4 NO gt gt Perform step 1 again 4 CHECK DTC With CONSULT III Cl Co Revision 2010 May SCS 67 2011 QX56 STANDARD VEHICLE HEIGHT SETTING lt BASIC INSPECTION gt AIR LEVELIZER CONTROL SYSTEM Select Self Diagnostic Results in E SUS Is any DTC detected YES gt gt Refer to SCS 59 DTC Index NO gt gt SETTING END Revision 2010 May SCS 68 2011 QX56 C1801 HEIGHT SENSOR lt DTC CIRCUIT DIAGNOSIS gt AIR LEVELIZER CONTROL SYSTEM DTC CIRCUIT DIAGNOSIS C1801 VHCL HEIGHT SENSOR DTC Logic INFOID 0000000006256062 DTC DETECTION LOGIC DTC Display Malfunction detected condition Possible cause Harness or connectors Sensor circuit is open Vehicle height sensor Air levelizer control module Rear suspension component parts Signal voltage of the vehicle height sen
20. continuity between air levelizer control module harness connector and IPDM E R harness connec tor Air levelizer control module IPDM E R Continuity Connector Terminal Connector Terminal B84 9 E10 5 Existed 4 Check continuity between air levelizer control module harness connector ground Air levelizer control module a Continuity Connector Terminal B84 9 Ground Not existed Is the inspection result normal YES gt gt TO3 NO Repair or replace damaged parts Q CHECK IPDM E R Check the IPDM E R Refer to PCS 10 Diagnosis Description Is the inspection result normal YES gt gt Check intermittent incident Refer to GI 40 Intermittent Incident NO gt gt Repair or replace damaged parts Revision 2010 May 5 5 89 2011 56 CK SUSP INDICATOR LAMP CIRCUIT lt DTC CIRCUIT DIAGNOSIS gt AIR LEVELIZER CONTROL SYSTEM CK SUSP INDICATOR LAMP CIRCUIT D esc ri pti n INFOID 0000000006256089 Air levelizer control module transmits CK SUSP indicator lamp signal to combination meter via CAN communi cation when setting of standard vehicle height is incomplete Based on the signal combination meter turns CK SUSP indicator lamp ON Component Function Check INFOID 0000000006256060 1 CK SUSP INDICATOR LAMP OPERATION CONSULT III 1 Turn ignition switch ON 2 Select WARNING LAMP in Active Test in E SUS 3 While operating test item check that
21. control module gt gt GO TO 2 2 CHECK DTC DETECTION 8 With CONSULT III 1 Start the engine 2 Run engine for at least 2 consecutive seconds at idle speed 3 Perform Self Diagnostic Results in E SUS Is 01010 detected YES gt gt Go to SCS 88 Diagnosis Procedure NO gt gt INSPECTION END Diagnosis Procedure INFOID 0000000006256087 1 CHECK INTERMITTENT INCIDENT Refer to 40 Intermittent Incident Is the inspection result normal YES gt gt Replace the air levelizer control module Refer to SCS 94 Removal and Installation NO Repair or replace damaged parts Revision 2010 May SCS 88 2011 QX56 POWER SUPPLY AND GROUND CIRCUIT lt DTC CIRCUIT DIAGNOSIS gt AIR LEVELIZER CONTROL SYSTEM POWER SUPPLY AND GROUND CIRCUIT Diagnosis Procedure INFo1D 0000000006258088 1 AIR LEVELIZER CONTROL MODULE IGNITION POWER SUPPLY CIRCUIT 1 Disconnect air levelizer control module connector 2 ignition switch ON CAUTION Never start the engine 3 Check voltage between the air levelizer control module harness connector and ground Air levelizer control module Voltage Connector Terminal B84 9 Ground 10 16 V Is the inspection result normal YES gt gt END NO gt gt GO TO 2 2 HARNESS BETWEEN AIR LEVELIZER CONTROL MODULE AND IPDM E R 1 Turn ignition switch OFF 2 Disconnect IPDM E R connector 3 Check
22. during air bleeding operation Clean surrounding areas of oil inlet and air bleeder using steam before starting operation since there may be mud on it Always decrease pressure when removing a system related part since system pressure is high Seal the removed part using vinyl tape for preventing dirt from getting on or entering the removed part Check system pressure again 1 day or more after bleeding operation is complete since system pressure may decrease when air bleeding is insufficient Use Genuine NISSAN Hydraulic Suspension Fluid for suspension fluid Never reuse drained suspension fluid Check for suspension fluid leakage after removing a system related part Revision 2010 May SCS 5 2011 QX56 PREPARATION lt PREPARATION gt HBMC PREPARATION PREPARATION Special Service Tools INFOID 0000000006255997 The actual shapes of Kent Moore tools may differ from those of special service tools illustrated here Tool number Kent Moore No Description Tool name KV40107700 Air bleeding System diagnosis Suspension oil pump JSEIA0183ZZ KV40108000 System pressure check Oil pressure gauge JSEIA0184ZZ KV40108400 Shock absorber leakage check AN M Leak check plug JSEIA0185ZZ Commercial Service Tools INFOID 2000000006414885 Tool name Description Power tool Loosening bolts and nuts PBICO190E Revision 2010 May SCS 6 2011 QX56 DESCRIPTION lt SYSTEM DESCRIPTION
23. gt Goto SCS 72 Diagnosis Procedure NO gt gt INSPECTION END Diagnosis Procedure INFOID o000000006256066 1 AIR COMPRESSOR ON SIGNAL FROM AIR LEVELIZER CONTROL MODULE 8 CONSULT III 1 Disconnect air compressor relay connector Turn ignition switch ON CAUTION Never start the engine 3 Select COMPRESSOR in Active Test in E SUS 4 Touch ON 5 While operating test item check voltage between air compressor relay harness connector and ground Air compressor relay Voltage Connector Terminal E116 2 Ground 9 16V Is the inspection result normal YES gt gt GOTO4 NO gt gt GO TO 2 2 CHECK HARNESS BETWEEN AIR LEVELIZER CONTROL MODULE AND AIR COMPRESSOR RELAY 1 Turn ignition switch OFF 2 Disconnect air levelizer control module connector Revision 2010 May SCS 72 2011 QX56 C1802 AIR SUS COMPRS RELAY lt DTC CIRCUIT DIAGNOSIS gt AIR LEVELIZER CONTROL SYSTEM 3 Check continuity between air levelizer control module harness connector and air compressor relay har ness connector Air levelizer control module Air compressor relay Continuity Connector Terminal Connector Terminal B84 3 E116 2 Existed 4 Check continuity between air levelizer control module harness connector and ground Air levelizer control module Continuity Connector Terminal B84 3 Ground Not existed 5 Check voltage between air lev
24. in the outer side of corner Then pressure increases by action of gas spring of nitrogen gas according to amount of oil that flows in Pressure in the inner side of corner decreases since oil is discharged from accumulator by stroke extending direction of shock absorber The pressure difference generates stabilizer like action to maintain balance in vehicle posture for a steady driving at cornering Revision 2010 May SCS 12 2011 QX56 SYSTEM lt SYSTEM DESCRIPTION gt HBMC Left hand curve Rear shock SEE Rear shock absorber RH 6 absorber LH PPMU Outside Inside Vehicle front 2 f Accumulator LH Accumulator RH Front shock absorber RH Front shock absorber LH JSEIA0177GB During rough road driving Front wheel LH compressing front wheel RH extending rear wheel LH extending rear wheel RH compressing Discharged oil from each shock absorber moves along piping path but oil does not overflow from piping path since oil moves in between each shock absorber Oil does not flow in accumulator and system pressure does not increase Since the oil from the contracted shock absorber flows into the shock absorber upper chamber stabilizer like action is not generated This improves the adhesion level and the running performance on rough roads Revision 2010 May SCS 13 2011 QX56 SYSTEM lt SYSTEM DESCRIPTION gt HBMC Rear shock SESS 7 M absorber
25. rear joint B 7 Remove mounting bolts of bracket of rear tube assembly A and B 8 Remove rear tube assembly A from the vehicle 9 Perform inspection after removal Refer to SCS 46 REAR TUBE ASSEMBLY Inspection Rear Tube Assembly B from Rear Shock Absorber RH Lower to Left Side Rear Joint 1 Reduce system pressure Refer to SCS 17 Work Procedure 2 Remove rear muffler Refer to EX 5 Removal and Installation Revision 2010 May SCS 45 2011 QX56 HYDRAULIC BODY MOTION CONTROL SYSTEM lt REMOVAL AND INSTALLATION gt HBMC 3 Remove lower side pipe A of rear shock absorber RH 4 Remove pipe A from left side rear joint B 5 Remove mounting bolts of bracket of rear tube assembly B 6 Remove mounting bolts of bracket of rear left brake hose and then free hose 7 Remove rear tube assembly B from the vehicle 8 Perform inspection after removal Refer to SCS 46 TUBE ASSEMBLY Inspection 1 JSEIA02042Z INSTALLATION Note the following and install in the reverse order of removal Apply genuine NISSAN hydraulic suspension fluid to O ring Check connection portion of each piping for dirt or dust U B E ASS E M B LY i n specti n INFOID 0000000006256034 INSPECTION AFTER REMOVAL O ring must be free of scratches and damage Pipe and tube must be free of scratches and damage INSPECTION AFTER INSTALLATION Check oil leakage twists
26. the CK SUSP indicator lamp activates ON CK SUSP indicator lamp turns ON OFF CK SUSP indicator lamp turns OFF Is the inspection result normal YES gt gt INSPECTION END NO Refer to SCS 90 Diagnosis Procedure Diagnosis Procedure INFOID 0000000006256091 1 SELF DIAGNOSIS CONSULT III 1 Turn ignition switch ON 2 Select Self Diagnostic Result in 505 Are any DTC detected YES Refer to SCS 59 Index NO gt gt GO TO 2 2 CHECK COMBINATION METER Check combination meter Refer to MWI 29 On Board Diagnosis Function Is the inspection result normal YES gt gt Replace the air levelizer control module Refer to SCS 94 Removal and Installation NO gt gt Repair or replace the combination meter Refer to MWI 85 Removal and Installation Revision 2010 May SCS 90 2011 QX56 VEHICLE HEIGHT CANNOT RAISED lt SYMPTOM DIAGNOSIS gt AIR LEVELIZER CONTROL SYSTEM SYMPTOM DIAGNOSIS VEHICLE HEIGHT CANNOT BE RAISED D e 5 ri pt n INFOID 0000000006256092 Vehicle height remains in low status Diagnosis Procedure INFOID 2000000006256065 1 CHECK APPEARANCE Visually check for fuse malfunction of suspension components installation malfunction or deformation of vehicle height sensor Is the inspection result normal YES gt gt 2 NO Repaire or replace damaged parts 2 PERFORM SELF DIAGNOSIS 1 Turn ig
27. to adjust some devices faster and more accurately Self Diagnostic Results Retrieve DTC from ECU and display diagnostic items Data Monitor Monitor the input output signal of the control unit in real time CAN Diagnosis This mode displays a network diagnosis result about CAN by a diagram CAN Diagnostic Support monitors the status of CAN communication Monitor ECU Identification Display the ECU identification number part number etc of the selected system Active Test Send the drive signal from CONSULT III to the actuator The operation check can be performed WORK SUPPORT CAUTION Perform the procedure when the vehicle is stopped name Description STANDARD HEIGHT LEVEL Forcibly sets vehicle height to the set standard vehicle height ADJUST HEIGHT INI Sets standard vehicle height CLEAR HEIGHT INI Erases standard vehicle height SELF DIAGNOSTIC RESULTS Refer to SCS 59 DTC Index When CRNT is displayed on self diagnosis result The system is presently malfunctioning When PAST is displayed on self diagnosis result System malfunction in the past is detected but the system is presently normal Freeze frame data FFD Item name Description The number of times that ignition switch is turned ON after the DTC is detected is displayed When 0 is displayed It indicates that the system is presently malfunctioning When except 0 is displayed It indicates that
28. 0 ht Se n SO r INFOID 0000000006256048 Vehicle height sensor is installed between rear suspension member 1 and rear lower link 2 Since arm A portion and rod B portion are ball joint type distance between rear suspension member and rear lower link shortens when vehicle height of vehicle rear lowers because of laden or towing con ditions and arm portion changes to the status that is higher in its left side as shown in the figure This angle change in arm portion is transmitted to the air levelizer control module according to electric signal JSEIA0219ZZ Revision 2010 May SCS 53 2011 QX56 SYSTEM lt SYSTEM DESCRIPTION gt AIR LEVELIZER CONTROL SYSTEM SYSTEM Syste D iag ram INFOID 0000000006256049 Air compressor relay Vehicle height Air levelizer Air compressor sensor control module Exhaust solenoid ABS actuator and electric unit control unit gt Electrical signal mcm CAN communication line Air line JSEIA0220GB System Description INFOID O000000006256050 Based on the signal from the vehicle height sensor the air levelizer control module operates the air com pressor exhaust solenoid and controls vehicle height so that it remains at a constant height This operation occurs if vehicle height of vehicle rear is judged to be 15 mm 0 59 in or more or 15 mm 0 59 in or less than standard vehicle height continuously for 30 seconds when engine is started
29. 4 NO gt gt Perform adjustment of system pressure Refer to SCS 18 Work Procedure 4 CHECK INTERNAL LEAKAGE Check internal leakage Refer to SCS 20 Work Procedure Is the inspection result normal YES gt gt INSPECTION END NO gt gt GO TO 5 9 CHECK MALFUNCTIONING PART Identify malfunctioning part Refer to SCS 22 Work Procedure Does the pressure increase YES Replace the PPMU Refer to SCS 39 PPMU MIDDLE TUBE ASSEMBLY PPMU PIPE Removal and Installation NO gt gt GO TO 6 SHOCK ABSORBER Identify malfunctioning shock absorber Refer to SCS 24 Work Procedure gt gt Replace identified shock absorber Refer to 50 10 Removal and Installation front RSU 8 Removal and Installation rear Revision 2010 May SCS 30 2011 QX56 HYDRAULIC BODY MOTION CONTROL SYSTEM lt REMOVAL AND INSTALLATION gt HBMC REMOVAL AND INSTALLATION HYDRAULIC BODY MOTION CONTROL SYSTEM H yd ra n 9 INFOID 0000000006256020 JSEIA0228ZZ 1 Middle tube assembly RH 2 Accumulator assembly RH 3 Front tube assembly 4 Front tube assembly B 5 Accumulator assembly LH 6 PPMU pipe T PPMU assembly 8 Middle tube assembly LH 9 PPMU pipe B 10 Rear tube assembly 11 Rear tube assembly lt Vehicle front FRONT TUBE ASSEMBLY Revision 2010 May SCS 31 2011 QX56 HYDRAULIC BODY MOTION CONTROL SYSTEM lt REMOVAL AND INSTALLATION gt H
30. 6023 INSPECTION AFTER REMOVAL O ring must be free of scratches and damage Pipe and tube must be free of scratches and damage INSPECTION AFTER INSTALLATION Check oil leakage twists deformation contact with other parts and loose connections ADJUSTMENT AFTER INSTALLATION Perform air bleeding Refer to SCS 18 Work Procedure ACCUMULATOR Revision 2010 May SCS 34 2011 QX56 HYDRAULIC BODY MOTION CONTROL SYSTEM lt REMOVAL AND INSTALLATION gt ACCUMULATOR Exploded View I 5 0 0 51 44 9 13 1 3 10 J 13 1 3 10 P 13 1 3 10 HBMC INFOID 0000000006256024 N i 2 5 N N s 491 5 0 0 51 1 0 13 1 3 10 2 13 1 3 10 2 13 1 3 10 aoe 1 O ring 2 Accumulator assembly RH 3 Accumulator assembly LH lt Vehicle front al Apply genuine NISSAN hydraulic suspension fluid Refer to 4 Components for symbols not described on the above ACCUMULATOR Removal and Installation REMOVAL Accumulator Assembly LH WARNING Revision 2010 May SCS 35 INFOID 0000000006256025 2011 QX56 HYDRAULIC BODY MOTION CONTROL SYSTEM lt REMOVAL AND INSTALLATION gt HBMC Never remove mounting bolts of protector 1 Reduce system pressure Refer to SCS 17 Work Procedure 2 Disconnect pipe A of accumulator assembly LH from left side 3 way B JSEIA0195ZZ 3 Disconnect pipe A of accumulator assembly LH from left side middle joint B
31. 6256001 JSEIA0228ZZ 1 Middle tube assembly RH 2 Accumulator assembly RH 3 Front tube assembly 4 Front tube assembly B 5 Accumulator assembly LH 6 PPMU pipe A 7 PPMU assembly 8 Middle tube assembly LH 9 pipe B 10 Rear tube assembly 11 Reartube assembly B lt Vehicle front 5 h ock Abso rber INFOID 0000000006256002 The use of accumulator generated pressure responsive to driving conditions or pressure generated by oil flow to the upper lower chamber improves the steering stability at curving in addition to the running performance and a ride quality during off road travel FRONT SIDE Oil enters from oil inlet outlet hole A and flows into lower chamber 3 via outside oil path of cylinder inside Oil enters from oil inlet outlet hole B and flows into upper chamber 1 With the pressure difference between oil flowed into the upper chamber and lower chamber the piston 2 moves up and down and conveys a force generated through this motion to the tires Revision 2010 May 5 5 9 2011 QX56 STRUCTURE AND OPERATION lt SYSTEM DESCRIPTION gt HBMC JSEIA0173ZZ 1 Upper chamber 2 Piston 3 Lower chamber A inlet outlet hole B Oil inlet outlet hole lt Vehicle upper REAR SIDE Cil enters from oil inlet outlet hole A and flows into upper chamber 1 Cil enters from oil inlet outlet hole B and flows into lower chamber 3 via outside oil path of cylinder
32. 6256010 CAUTION Clean surrounding areas of oil injection jack using steam before starting operation since there may be mud on it Clean oil pressure gauge special service tool KV40108000 jack with steam before use 1 Liftup the vehicle 2 Remove protector of PPMU 3 Remove cap of oil injection jack 4 Install an oil pressure gauge SST KV40108000 A to oil injec tion jack CAUTION Jack must be securely inserted until a click sound can be heard Pressure reducing valve B of the oil pressure gauge must be closed JSEIA0186ZZ 5 Loosen needle valves A C and E of PPMU by approximately 2 rotations CAUTION Never loosen the needle valve more than required 6 Loosen pressure reducing valve A of oil pressure gauge and then lower pressure CAUTION Be careful since oil drains swiftly from oil drain hole B 7 Check that reading of oil pressure gauge is 0 MPa 8 Tighten needle valves A C and E of PPMU to the specified torque Tightening torque 8 3 0 85 kg m 73 in Ib JSEIA0188ZZ Revision 2010 May SCS 17 2011 QX56 AIR BLEEDING METHOD lt BASIC INSPECTION gt HBMC AIR BLEEDING METHOD Work Procedure INFOID 0000000006256011 WARNING Always check the piping for loose connections damage or twists before starting operation since pressure in hydraulic circuit becomes high during operation When repairing or replacing a malfunctioning part always release pressure from hydraul
33. 803 AIR SUSPENSION EXH SOL DTC Logic INFOID 0000000006256067 DTC DETECTION LOGIC DTC Display item Malfunction detected condition Possible cause Output voltage of the exhaust solenoid remains 9 V or less continuously for 5 seconds during exhaust solenoid ON signal output by the air levelizer con 9 put 9y Harness or connector trol module SUS Output voltage of the exhaust solenoid remains 2 V exhaust solenoid Air levelizer control module or more continuously for 10 seconds during ex haust solenoid ON signal output by the air levelizer control module DTC CONFIRMATION PROCEDURE 1 PRECONDITIONING If CONFIRMATION PROCEDURE has been previously conducted always turn ignition switch OFF andwait at least 10 seconds before conducting the next test gt gt GO TO 2 2 DTC DETECTION With CONSULT III 1 Turn ignition switch ON and wait 10 seconds or more 2 Select EXHAUST SOLENOID in Active Test in E SUS 3 Touch and wait 5 seconds or more 4 Select Self Diagnostic Result in E SUS Is 1803 detected YES gt gt Goto SCS 74 Diagnosis Procedure NO gt gt INSPECTION END Diagnosis Procedure INFOID 2000000006256065 1 EXHAUST SOLENOID ON SIGNAL FROM AIR LEVELIZER CONTROL MODULE 8 CONSULT III 1 Disconnect air compressor harness connector Turn ignition switch ON CAUTION Never start the engine
34. BMC FRONT TUBE ASSEMBLY 2 Exploded View INFOID 0000000006256021 SEC 432 5 0 0 51 44 2 13 1 3 10 ig 5 0 0 51 44 A PO a gt 9 13 1 3 10 JSEIA0229GB 1 Protector B 2 Bushing 3 4 Bleeder valve 5 Cap 6 O ring 7 Front tube assembly 8 Front tube assembly B 9 Protector A A To front shock absorber LH B front shock absorber RH lt a Vehicle front al Apply genuine NISSAN hydraulic suspension fluid Refer to GlI 4 Components for symbols not described on the above FRONT TUBE ASSEMBLY Removal and Installation INFOID 0000000006256022 REMOVAL Front Tube Assembly A from Front Shock Absorber RH Upper to Front Shock Absorber LH Lower 1 Reduce system pressure Refer to 5 5 17 Work Procedure Revision 2010 May SCS 32 2011 QX56 HYDRAULIC BODY MOTION CONTROL SYSTEM lt REMOVAL AND INSTALLATION gt HBMC 2 Disconnect lower side pipe A of front shock absorber LH B Upper side pipe 3 Disconnect pipe A of accumulator assembly LH from left side 3 way B gt Disconnect upper side pipe A of front shock absorber B Lower side pipe 5 Remove protector A with power tool 6 Remove mounting bolts of left side 3 way 7 Remove protector B with power tool 8 Remove mounting bolts of each bracket 9 Remove front tube assembly A from the vehicle 10 Perform inspection after removal Refer to SCS 34 FRONT TUBE ASSEMB
35. BODY MOTION CONTROL SYSTEM lt REMOVAL AND INSTALLATION gt HBMC Completely engage hooks on frame when installing accumulator assembly JSEIA02022Z AC U M U LATO R ns pect on INFOID 0000000006256026 INSPECTION AFTER REMOVAL O ring must be free of scratches and damage Pipe and tube must be free of scratches and damage INSPECTION AFTER INSTALLATION Check oil leakage twists deformation contact with other parts and loose connections ADJUSTMENT AFTER INSTALLATION Perform air bleeding Refer to SCS 18 Work Procedure AC U M U LATO R r D isposal INFOID 0000000006256027 CAUTION Always wear safety goggles Always wear safety gloves Be careful since pressure is higher when temperature is high Be careful since metal shavings or oil may be blown away by compressed gas Discard drained oil in accordance with local laws and regulations WORK PROCEDURE 1 Remove both tanks using an oil filter wrench 2 Secure tank using a vise 3 Drill a hole as shown in the figure using an electric drill Drain gas and oil NOTE Gas is colorless odorless and harmless Use an electric drill with a drill bit of approximately 4 mm 0 16 in Drilling a hole is easier when electric drill speed is slow e JSEIA0182Z2Z PPMU MIDDLE TUBE ASSEMBLY PPMU PIPE Revision 2010 May SCS 38 2011 QX56 HYDRAULIC BODY MOTION CONTROL SYSTEM lt REMOVAL AND INSTALLATION gt HBMC PPMU
36. CAUTION Clean surrounding areas of oil injection jack using steam before starting operation since there may be mud on it Clean oil pressure gauge special service tool KV40108000 jack with steam before use 1 Remove protector of PPMU 2 Remove cap of oil injection jack 3 Install an oil pressure gauge SST KV40108000 A to oil injec tion jack CAUTION Jack must be securely inserted until a click sound can be heard Pressure reducing valve B of the oil pressure gauge must be closed JSEIA0186ZZ 4 Loosen needle valves A C and E of PPMU by approximately 2 rotations CAUTION Never loosen the needle valve more than required 5 Lift up the vehicle CAUTION Check that tires never contact the ground 6 Tighten needle valves A C and E of PPMU 7 Lift down the vehicle CAUTION Check that the lift is fully lowered 5 1 018722 8 Loosen pressure reducing valve of pressure gauge and then lower pressure CAUTION Be careful since oil drains swiftly from oil drain hole B 9 Check that reading of oil pressure gauge is 0 MPa Close pres sure reducing valve 10 Loosen needle valve E of PPMU by approximately 2 rotations CAUTION Never loosen the needle valve more than required 11 Write down a value of the oil pressure gauge 12 Tighten needle valve E of PPMU 13 Loosen pressure reducing valve of oil pressure gauge and then lower pressure CAUTION Be careful since oil drains swiftly from oil
37. CLE HEIGHT SETTING Refer to SCS 67 Work Procedure NO gt gt Replace the vehicle height sensor Refer to SCS 98 Removal and Installation Revision 2010 May SCS 71 2011 QX56 C1802 SUS 5 RELAY lt DTC CIRCUIT DIAGNOSIS gt AIR LEVELIZER CONTROL SYSTEM C1802 AIR SUS COMPRS RELAY DTC Logic INFOID 0000000006256065 DTC DETECTION LOGIC DTC Display item Malfunction detected condition Possible cause Output voltage of the air compressor relay remains 9 V or less continuously for 5 seconds during air compressor ON signal output by the air levelizer Harness or connector control module C1802 AIR SUS COMPRS RELAY Air compressor relay Output voltage of the air compressor relay remains Air levelizer control module 2 V or more continuously for 10 seconds during air compressor OFF signal output by the air levelizer control module DTC CONFIRMATION PROCEDURE 1 PRECONDITIONING If CONFIRMATION PROCEDURE has been previously conducted always turn ignition switch OFF andwait at least 10 seconds before conducting the next test gt gt GO TO 2 2 DTC DETECTION E With CONSULT III 1 Turn ignition switch ON and wait 10 seconds or more 2 Select COMPRESSOR in Active Test in 505 3 Touch and wait 5 seconds or more 4 Select Self Diagnostic Result in 505 Is 1802 detected YES gt
38. CS 87 Diagnosis Procedure NO gt gt INSPECTION END Diagnosis Procedure InFo10 0900000008256084 Go to LAN 18 Trouble Diagnosis Flow Chart Revision 2010 May SCS 87 2011 QX56 01010 CONTROL UNIT lt DTC CIRCUIT DIAGNOSIS gt AIR LEVELIZER CONTROL SYSTEM U1010 CONTROL UNIT CAN D esc ri pti n INFOID 0000000006256085 CAN Controller Area Network is a serial communication line for real time application It is an on vehicle mul tiplex communication line with high data communication speed and excellent malfunction detection ability Many electronic control units are equipped onto a vehicle and each control unit shares information and links with other control units during operation not independently In CAN communication control units are con nected with 2 communication lines CAN H line CAN L line allowing a high rate of information transmission with less wiring Each control unit transmits receives data but selectively reads required data only DT C Log ic INFOID 0000000006256086 DTC DETECTION LOGIC DTC Display Malfunction detected condition Possible cause Detecting error during the initial diagnosis of CAN controller of air levelizer control module DTC CONFIRMATION PROCEDURE 1 PRECONDITIONING If DTC CONFIRMATION PROCEDURE is previously conducted always turn ignition switch OFF and wait at least 10 seconds before performing the next test U1010 CONTROL UNIT CAN Air levelizer
39. ECTION gt AIR LEVELIZER CONTROL SYSTEM STANDARD VEHICLE HEIGHT SETTING D e SC ri pt n INFOID 0000000006256060 Air levelizer control module enables precise control by acquiring memorized standard vehicle height and sig nal vehicle height from vehicle height sensor For this reason always set standard vehicle height after per forming the following operations Removal and installation or replacement of vehicle height sensor Replacement of air levelizer control module Wo rk P roced INFOID 0000000006256061 1 CLEAR STANDARD VEHICLE HEIGHT With CONSULT III 1 Lift up the vehicle CAUTION Check that tires never contact the ground Start the engine Select COMPRESSOR in Active Test in 505 Touch and wait 60 seconds or more Touch OFF Select CLEAR HEIGHT INI in Work Support in 505 Touch Start Touch Clear NOTE CONSULT III continues indicating EXECUTING The completion of the standard vehicle height erasing can be checked by the CK SUSP indicator lamp ON condition Does CK SUSP indicator lamp turn ON YES gt gt 2 NO gt gt Perform step 1 again 2 ADJUST STANDARD VEHICLE HEIGHT With CONSULT III 1 Select ADJUST HEIGHT INI in Work Support in E SUS 2 Touch Start 3 Touch Initial 1 NOTE CONSULT III continues indicating EXECUTING The completion of the standard vehicle height
40. GIC DTC Display item Malfunction detected condition Possible cause Harness or connector Vehicle height sensor The vehicle height is 15 mm 0 59 in or more raise than Air compressor exhaust sole the reference height despite the output of exhaust sole 1805 noid ON signal continuously for 120 seconds by the air levelizer control module Rear suspension component parts DTC CONFIRMATION PROCEDURE 1 PRECONDITIONING If CONFIRMATION PROCEDURE has been previously conducted always turn ignition switch OFF andwait at least 10 seconds before conducting the next test gt gt GO TO 2 2 CHECK DTC DETECTION With CONSULT III 1 Start the engine and wait 150 seconds or more 2 Perform Self Diagnostic Result in E SUS 15 1805 detected YES gt gt Goto SCS 80 Diagnosis Procedure NO gt gt INSPECTION END Diagnosis Procedure INFOID 0000000006256075 1 APPEARANCE Visually check for malfunction of suspension components crush of air tube installation malfunction or defor mation of vehicle height sensor Is the inspection result normal YES gt gt 2 NO Repaire or replace damaged parts 2 CHECK INTERMITTENT INCIDENT Refer to 40 Intermittent Incident Is the inspection result normal YES gt gt Perform STANDARD VEHICLE HEIGHT SETTING Refer to SCS 67 Work Proce
41. IG Other than the above STOP When CK SUSP indicator lamp is ON On WARNING LAMP Other than the above Off TERMINAL LAYOUT pod u TERRA 9 101112 3 14 15 16 JSDIA0057ZZ PHYSICAL VALUES Terminal Description Wire color Condition Reference value Signal name Input 9 Output B Ground GND Always Less than 1 Q 3 Air compressor ON 9 16 V Ground Air compressor relay Output IGNON V Air compressor OFF Less than 2 V v Ground height sensor Always Less than 1 Q Revision 2010 May SCS 58 2011 QX56 AIR LEVELIZER CONTROL MODULE lt ECU DIAGNOSIS INFORMATION gt AIR LEVELIZER CONTROL SYSTEM Terminal Description Wire color z Reference value Condition Signal name Input PURIS 9 Output 5 Vehicle height sensor IGN ON 0 2 4 6 V Ground Input W SIGNAL IGN OFF 7 16 Input P D CAN L Output 54 690 9 Air levelizer control module IGN ON 10 16 V Ground Input P L power supply IGN OFF OV 11 Exhaust solenoid 9 16 Ground Exhaust solenoid Output IGN ON V W Exhaust solenoid OFF Less than 2 V i i IGN ON 45 55V 13 Ground Vehicle height sensor Output R Power supply IGN OFF 16 7 Input D P CAN H Output 54 690 l safe INFOID 0000000006256054 If malfunction is detected control stops The system may enter fail safe mode under certain conditions
42. LATOR Removal and Installation 35 AIR LEVELIZER CONTROL MODULE 58 ACCUMULATOR Inspection 38 Reference Value 58 ACCUMULATOR Disposal 38 teile en 59 DTC Inspection Priority Chart 59 PPMU MIDDLE TUBE ASSEMBLY PPMU PIPE 38 DTG de 5 59 PPMU MIDDLE TUBE ASSEMBLY PPMU PIPE Exploded VIEW WIRING DIAGRAM 61 PPMU MIDDLE TUBE ASSEMBLY PPMU PIPE Removal and Installation 39 AIR LEVELIZER CONTROL SYSTEM 61 PPMU MIDDLE TUBE ASSEMBLY PPMU PIPE Wiring Diagram 61 INSPOGCUON eee e sexe dec 43 PPMU MIDDLE TUBE ASSEMBLY PPMU PIPE BASIC INSPECTION 65 Disposal PES 43 DIAGNOSIS AND REPAIR WORKFLOW EX 65 REAR TUBE ASSEMBLY mme 43 Work Flow eii bere etc 65 REAR TUBE ASSEMBLY Exploded View 44 Diagnostic Work Sheet 66 REAR TUBE ASSEMBLY Removal and Sa STANDARD VEHICLE HEIGHT SETTING 67 REAR TUBE ASSEMBLY Inspection 46 2 67 OK Procedure oet re reed 67 LEVELIZER CONTROL SYSTEM PRECAUTION cernens jp soe E 2
43. LY Inspection Front Tube Assembly B from Front Shock Absorber LH Upper to Front Shock Absorber RH Lower 1 Reduce system pressure Refer to SCS 17 Work Procedure 2 Disconnect upper side pipe B of front shock absorber LH A Lower side pipe JSEIA0233ZZ Revision 2010 May SCS 33 2011 QX56 HYDRAULIC BODY MOTION CONTROL SYSTEM lt REMOVAL AND INSTALLATION gt HBMC 3 Disconnect pipe A of accumulator assembly RH from right side 3 way B 4 Disconnect lower side pipe B of front shock absorber RH A 0 side pipe Remove protector A with power tool Remove mounting bolts of right side 3 way Remove protector B with power tool Remove mounting bolts of each bracket Remove front tube assembly B from the vehicle 0 Perform inspection after removal Refer to SCS 34 FRONT TUBE ASSEMBLY Inspection INSTALLATION Note the following and install in the reverse order of removal Apply genuine NISSAN hydraulic suspension fluid to O ring Check connection portion of each piping for dirt or dust Completely insert guide A to guide hole on frame when installing left side 3 way For tightening torque for pipe of accumulator assembly LH refer to SCS 35 ACCUMULATOR Exploded View For tightening torque for pipe of accumulator assembly RH refer to SCS 35 ACCUMULATOR Exploded View JSEIA0198Z2Z FRONT TUBE ASSEMBLY Inspection INFOID 000000000625
44. MIDDLE TUBE ASSEMBLY PPMU PIPE Exploded View NEIE 432 as 8 3 0 85 73 7 12 13 1 3 10 gt gt lt 2 9 13 1 3 10 lt 9 13 1 3 10 2 2 16 2 1 7 12 JSEIA0231GB 1 PPMU pipe B 2 Cap 3 Middle tube assembly RH 4 O ring 5 Bleeder valve 6 Middle tube assembly LH 7 8 9 Protector 10 PPMU pipe A A Torear shock absorber RH B Torear shock absorber LH lt u Vehicle front Fr Apply genuine NISSAN hydraulic suspension fluid Refer to GlI 4 Components for symbols not described on the above PPMU MIDDLE TUBE ASSEMBLY PPMU PIPE Removal and Installation INFOID 0000000006256029 REMOVAL PPMU Revision 2010 May SCS 39 2011 QX56 HYDRAULIC BODY MOTION CONTROL SYSTEM lt REMOVAL AND INSTALLATION gt HBMC Reduce system pressure Refer to SCS 17 Work Procedure Remove protector Disconnect PPMU pipe A and PPMU pipe B from PPMU Remove mounting bolts of PPMU Remove PPMU from the vehicle Perform inspection after removal Refer to SCS 43 PPMU MIDDLE TUBE ASSEMBLY PPMU PIPE Inspection Middle Tube Assembly LH from Rear Shock Absorber LH Upper to Left Side Middle Joint 1 Reduce system pressure Refer to SCS 17 Work Procedure 2 Remove PPMU 3 Disconnect upper side pipe A of rear shock absorber LH D Or B Lower side pipe 4 Disconnect pipe A of rear tube assembly B from left side rear
45. ON status of CK SUSP indicator lamp ACTIVE TEST CAUTION Perform the procedure when the vehicle is stopped careful that battery is not discharged when performing the procedure while engine is stopped Item name Description COMPRESSOR Air compressor can be operated EXHAUST SOLENOID Ehaust solenoid of air compressore can be operated WARNING LAMP CK SUSP indicator lamp can be turned ON or OFF Revision 2010 May SCS 57 2011 QX56 lt ECU DIAGNOSIS INFORMATION gt AIR LEVELIZER CONTROL MODULE AIR LEVELIZER CONTROL SYSTEM ECU DIAGNOSIS INFORMATION AIR LEVELIZER CONTROL MODULE Reference Value VALUES ON DIAGNOSIS TOOL INFOID 0000000006256053 name Condition Value Status Approx IGN VOLT Ignition switch ON 10 16 V Completion of the standard vehicle height setting CMPLT VHCL HT INTLZ STA Other than the above INCMP Completion of the standard vehicle height setting 1 VHCL HT INIT SLCT Other than the above 0 VHCL HEIGHT SEN Lift up the vehicle 2 8 3 8 V VHCL HT CNVSN VL Lift down the vehicle 15 15 mm VHCL HGT FIX TIME Lift up the vehicle Oh Completion of the standard vehicle height setting 2 800 3 800 V VHCL HGT INIT VAL Other than the above OV When the air compressor is operating On COMPRESSOR Other than the above Off When exhaust solenoid is operating On EXH SOLENOID Other than the above Off Engine running RUN ENG SPEED S
46. R GROUND 1 Turn ignition switch OFF 2 Check continuity between air compressor harness connector and ground Air compressor 2 Continuity Connector Terminal C12 3 Ground Existed Are the inspection results normal YES GO TOb NO Repair or replace damaged part 5 CHECK AIR COMPRESSOR EXHAUST SOLENOID Check the air compressor exhaust solenoid Refer to SCS 75 Component Inspection Is the inspection result normal YES gt gt Check intermittent incident Refer 01 40 Intermittent Incident NO Replace the air compressor Refer to SCS 95 Removal and Installation Component Inspection INFOID 0000000006256069 CAUTION Keep the inside of air compressor free of dust Keep the resin stick and resin pipe free of scratches and burrs 1 AIR COMPRESSOR EXHAUST SOLENOID 1 Remove the air compressor Refer to SCS 95 Removal and Installation Revision 2010 May SCS 75 2011 QX56 lt DTC CIRCUIT DIAGNOSIS gt 2 Insert resin stick 4 7 0 185 diameter into either one of the air compressor air tube holes to prevent leakage of air 3 Insert resin pipe 4 7 mm 0 185 in diameter into the other air tube hole and install air gauge C on the tip of the pipe 4 Apply 12 V between air compressor connector terminal 1 and 2 until the air gauge reading reaches approximately 500 mm Hg 0 67 MPa CAUTION Never make t
47. RH N absorber LH Front shock Front shock absorber RH S absorber LH t JSEIA0178GB Component Description INFOID 0000000006256008 Component parts Description Needle valve A Needle valve for oil filling or trouble diagnosis It is usually closed Needle valve B Needle valve for trouble diagnosis It is usually open Needle valve C Needle valve for oil filling or trouble diagnosis It is usually closed Needle valve D Needle valve for trouble diagnosis It is usually open Needle valve E Needle valve for oil filling or trouble diagnosis It is usually closed If system pressure increases then the orifice becomes clogged and oil flow into PPMU be Relief valve comes disrupted resulting in a large pressure difference between PPMU and both pipes In this case the relief valve opens to let the oil flow Oil filling inlet Qil injection jack For basic inspection use Air bleeder For air bleeding use Revision 2010 May SCS 14 2011 QX56 CHECK SYSTEM PRESSURE lt BASIC INSPECTION gt HBMC BASIC INSPECTION CHECK SYSTEM PRESSURE Wo rk P roced INFOID 0000000006256009 CAUTION Clean surrounding areas of oil injection jack using steam before starting operation since there may be mud on it Clean oil pressure gauge special service tool KV40108000 jack with steam before use 1 Liftup the vehicle 2 Remove protector of PPMU 3 Remove cap of oil injection jack 4 In
48. RKFLOW lt BASIC INSPECTION gt AIR LEVELIZER CONTROL SYSTEM BASIC INSPECTION DIAGNOSIS AND REPAIR WORKFLOW Wo rk F OW INFOID 0000000006256058 DETAILED FLOW 1 INTERVIEW FROM THE CUSTOMER Clarify customer complaints before inspection First of all perform an interview utilizing SCS 66 Diagnostic Work Sheet and reproduce the symptom as well as fully understand it Ask customer about his her complaints carefully Check symptoms by driving vehicle with customer if necessary CAUTION Customers are not professional Never guess easily like maybe the customer means that or maybe the customer mentions this symptom gt gt GO TO 2 2 CHECK SYMPTOM Reproduce the symptom that is indicated by the customer based on the information from the customer obtained by interview Also check that the symptom is not caused by fail safe mode Refer to SCS 59 Fail safe CAUTION When the symptom is caused by normal operation fully inspect each portion and obtain the under standing of customer that the symptom is not caused by a malfunction gt gt GO TO 3 3 PERFORM THE SELF DIAGNOSIS With CONSULT III Perform self diagnosis for E SUS Is any DTC detected YES gt gt Record or print self diagnosis results GO TO 4 NO GO TO 6 4 RECHECK THE SYMPTOM B With CONSULT III Erase self diagnostic results for E SUS 5 Perform DTC confirmation procedures for the error detected system NOTE If so
49. SING POWER TOOLS AIR OR ELECTRIC AND HAMMERS WARNING When working near the Air Bag Diagnosis Sensor Unit or other Air Bag System sensors with the ignition ON or engine running DO NOT use air or electric power tools or strike near the sensor s with a hammer Heavy vibration could activate the sensor s and deploy the air bag s possibly causing serious injury When using air or electric power tools or hammers always switch the ignition OFF disconnect the battery and wait at least 3 minutes before performing any service Precaution Necessary for Steering Wheel Rotation after Battery Disconnect INFOID 0000000006256136 NOTE Before removing and installing any control units first turn the push button ignition switch to the LOCK posi tion then disconnect both battery cables After finishing work confirm that all control unit connectors are connected properly then re connect both battery cables Always use CONSULT III to perform self diagnosis as part of each function inspection after finishing work If a DTC is detected perform trouble diagnosis according to self diagnosis results For vehicle with steering lock unit if the battery is disconnected or discharged the steering wheel will lock and cannot be turned If turning the steering wheel is required with the battery disconnected or discharged follow the operation pro cedure below before starting the repair operation OPERATION PROCEDURE 1 Connect both ba
50. SUSPENSION DGD SUSPENSION CONTROL SYSTEM CONTENTS HBMC CHECK SYSTEM PRESSURE 15 Work Procedute 15 PRECAUTION ra i a 4 PRESSURE REDUCING METHOD 17 PRECAUTIONS 4 Work Procedure 17 Precaution for Supplemental Restraint System SRS AIR BAG and SEAT BELT PRE TEN AIR BLEEDING METHOD 18 zie MO VOUS SEN IY 2 4 Work Procedure 18 Precaution Necessary for Steering Wheel Rota tion after Battery Disconnect 4 pese LEAKAGE 2s Precaution for Procedure without Cowl Top Cover 5 Ork Procedure e etes Precaution for Hydraulic Body Motion Control CHECK FOR MALFUNCTION 22 System e ERE DC ESAE EE 5 Work 222222222 22 PREPARATION 6 CHECK SHOCK ABSORBER FOR MAL PREPARATION 6 2 Special Service Tools 6 DIESE E diss aN i Commercial Service Tools 6 CHECK ORIFICE FOR CLOGGING 27 SYSTEM DESCRIPTION 7 Work Procedure 27 DESCRIPTION eesessssssccoccccccccsscccsccccceecseseessesensee SYMPTOM DIAGNOSIS
51. and Installation NO gt gt Repair or replace damaged parts 3 CHECK HARNESS BETWEEN AIR LEVELIZER CONTROL MODULE AND VEHICLE HEIGHT SENSOR 1 Turn ignition switch OFF 2 Disconnect air levelizer control module connector SCS 3 Check continuity between air levelizer control module harness connector and vehicle height sensor har ness connector Air levelizer control module Vehicle height sensor 21 Continuity Connector Terminal Connector Terminal 5 2 B84 C13 Existed 4 3 4 Check continuity between air levelizer control module harness connector and ground Air levelizer control module T Continuity Connector Terminal 5 B84 Ground Not existed Are the inspection results normal YES gt gt GOTO4 NO gt gt Repair or replace damaged parts 4 CHECK VEHICLE HEIGHT SENSOR Check the vehicle height sensor Refer to SCS 70 Component Inspection Is the inspection result normal YES gt gt Check intermittent incident Refer to GI 40 Intermittent Incident NO Replace the vehicle height sensor Refer to SCS 98 Removal and Installation Revision 2010 May SCS 83 2011 QX56 C1808 AIR SUS COMPRS lt DTC CIRCUIT DIAGNOSIS gt AIR LEVELIZER CONTROL SYSTEM C1808 AIR SUS COMPRS FNCTN DTC Logic INFOID 0000000006256080 DTC DETECTION LOGIC DTC Display item Malfunction detected condition Possible cause Harness or connector The cu
52. and operates air compressor Air compressor charges air in air chamber of shock absorber Vehicle height raises and control is complete when status is 1 mm 0 04 in of standard vehicle height value Bom Vehicle height lowers When starting engine if vehicle height of vehicle rear continues for 30 seconds or more in a status that is 15 mm 0 59 in or more of standard vehicle height 1 Vehicle height sensor detects vehicle height status and transmits this information to air levelizer control module 2 Airlevelizer control module turns exhaust solenoid of air compressor ON 3 Air compressor discharges air from air chamber of shock absorber 4 Vehicle height lowers and control is complete when status is 1 mm 40 04 in of standard vehicle height F a e S afe INFOID 0000000006256051 If malfunction is detected control stops The system may enter fail safe mode under certain conditions for example over laden conditions when elec tronic circuit is normal In this case always check that the system returns to normal by starting engine after unloading load Revision 2010 May SCS 55 2011 QX56 DIAGNOSIS SYSTEM AIR LEVELIZER CONTROL MODULE lt SYSTEM DESCRIPTION gt AIR LEVELIZER CONTROL SYSTEM DIAGNOSIS SYSTEM AIR LEVELIZER CONTROL MODULE CONSULT III Function INFOID 0000000006256052 CONSULT III APPLICATION ITEMS Diagnosictestmde Work Support This mode enables a technician
53. be and drain tank to bleeder valve in upper side of rear shock absorber RH Loosen bleeder valve and bleed air while sending oil by applying pressure using suspension oil pump and then quickly tighten air bleeder CAUTION Be careful that oil in suspension oil pump is not at half or JSEIAO1872Z less Repeat step 10 until no air appears in bleeder tube Tighten bleeder valve to the specified torque Refer to SCS 32 FRONT TUBE ASSEMBLY Exploded View front shock absorber SCS 39 PPMU MIDDLE TUBE ASSEMBLY PPMU PIPE Exploded View upper side of rear shock absorber Lower side of rear shock absorber Tightening torque 8 3 N m 0 85 kg m 73 in Ib Perform operation according to steps 9 to 12 in the order of rear shock absorber RH lower side front shock absorber RH upper side and lower side rear shock absorber LH upper side and lower side gt front shock absorber LH upper side and lower side Repeat steps 9 to 13 2nd turn Refer to the figure and send oil by applying pressure 5 10 15 20 25 30 35 40 41 50 59 88 77 86 95 104 Ambient Temp F JSEIA0236GB Tighten needle valves A C and E of PPMU to the specified torque Tightening torque 8 3 0 85 kg m 73 in Ib Set knob A of suspension oil pump to the direction as shown in the figure and check that reading of pressure gauge is 0 MPa Remove hose of suspension oil pump Install cap of oil injection jack
54. deformation contact with other parts and loose connections ADJUSTMENT AFTER INSTALLATION Perform air bleeding Refer to SCS 18 Work Procedure Revision 2010 May SCS 46 2011 QX56 PRECAUTIONS lt PRECAUTION gt AIR LEVELIZER CONTROL SYSTEM PRECAUTION PRECAUTIONS Precaution for Supplemental Restraint System SRS AIR BAG and SEAT BELT PRE TENSIONER INFOID 0000000006256135 The Supplemental Restraint System such as AIR BAG and SEAT BELT PRE TENSIONER used along with a front seat belt helps to reduce the risk or severity of injury to the driver and front passenger for certain types of collision This system includes seat belt switch inputs and dual stage front air bag modules The SRS system uses the seat belt switches to determine the front air bag deployment and may only deploy one front air bag depending on the severity of a collision and whether the front occupants are belted or unbelted Information necessary to service the system safely is included in the SRS AIR BAG and SEAT BELT of this Service Manual WARNING To avoid rendering the SRS inoperative which could increase the risk of personal injury or death in the event of a collision that would result in air bag inflation all maintenance must be performed by an authorized NISSAN INFINITI dealer Improper maintenance including incorrect removal and installation of the SRS can lead to personal injury caused by unintentional activation of the syste
55. dle valves A and C of PPMU by approximately 2 rotations for check changes in vehicle height CAUTION Never loosen the needle valve more than required 3 Tighten needle valve A and C of PPMU to the specified torque after the inspection Tightening torque 8 3 0 85 kg m 73 in Ib Does the vehicle height change 10 mm 0 39 in or more YES gt gt For detailed inspection of clogging of orifice in PPMU refer to SCS 27 Work Procedure gt gt INSPECTION END Revision 2010 May SCS 29 2011 QX56 LARGE ROLL ANGLE lt SYMPTOM DIAGNOSIS gt HBMC LARGE ROLL ANGLE D esc ri pti INFOID 0000000006256018 During cornering inclination of the vehicle to outer side of corner is large Inspection Procedure InFo10 0000000006256019 1 APPEARANCE 1 Visually check that the exterior parts e g suspension spring have no malfunctions 2 Visually check tube and pipe for crush or oil leakage Is the inspection result normal YES gt gt 2 NO gt gt Repair or replace damaged parts 2 CHECK NEEDLE VALVE OF PPMU Check that needle valves A and C are tightened to the specified torque Tightening torque 8 3 N m 0 85 kg m 73 in Ib Is the inspection result normal YES gt gt NO gt gt Tighten to the specified torque JSEIA01872Z 3 SYSTEM PRESSURE CHECK Check system pressure Refer to SCS 15 Work Procedure Is the inspection result normal YES gt gt GOTO
56. drain hole 14 Check that reading of oil pressure gauge is 0 MPa Close pressure reducing valve 15 Loosen needle valve A of PPMU by approximately 2 rotations CAUTION Never loosen the needle valve more than required 16 Read a value of the oil pressure gauge after 5 minutes 17 Compare difference of reading with pressure reading in step 11 JSEIA0188ZZ Revision 2010 May SCS 27 2011 QX56 CHECK ORIFICE FOR CLOGGING lt BASIC INSPECTION gt HBMC Pressure difference 0 2 MPa or more Replace the PPMU Refer to SCS 39 PPMU MIDDLE TUBE ASSEMBLY PPMU PIPE Removal and Installation 0 2 MPa or less Normal 18 Tighten needle valve A of PPMU 19 Loosen pressure reducing valve of oil pressure gauge and then lower pressure CAUTION Be careful since oil drains swiftly from oil drain hole 20 Check that reading of oil pressure gauge is 0 MPa Close pressure reducing valve 21 Loosen needle valve C of PPMU by approximately 2 rotations CAUTION Never loosen the needle valve more than required 22 Read a value of the oil pressure gauge after 5 minutes 23 Compare difference of reading with pressure reading in step 11 Pressure difference 0 2 MPa or more Replace the PPMU Refer to SCS 39 PPMU MIDDLE TUBE ASSEMBLY PPMU PIPE Remov al and Installation 0 2 MPa or less Normal 24 Tighten needle valve C of PPMU 25 Loosen pressure reducing valve of oil pressure gauge and then lower pressure
57. dure NO Repair or replace damaged part Revision 2010 May SCS 80 2011 QX56 C1806 VHCL HEIGHT SEN FIX lt DTC CIRCUIT DIAGNOSIS gt AIR LEVELIZER CONTROL SYSTEM C1806 VHCL HEIGHT SEN FIX DTC Logic INFOID 0000000006256076 DETECTION LOGIC DTC Display item Malfunction detected condition Possible cause The signal voltage of the vehicle height sensor does not change for cumulated time of 100 hours under the C1806 VHCL HEIGHT SEN FIX condition that the air levelizer control module outputs sensor voltage 4 5 5 5 V with vehicle speeds 2 km h 2 MPH or more Harness or connector Vehicle height sensor DTC CONFIRMATION PROCEDURE 1 PRECONDITIONING If CONFIRMATION PROCEDURE has been previously conducted always turn ignition switch OFF andwait at least 10 seconds before conducting the next test GO TO 2 2 CHECK VEHICLE HEIGHT SENSOR FIXATION With CONSULT III 1 Start the engine 2 Select VHCL HEIGHT SEN in Data Monitor in E SUS 3 Drive vehicle and maintain the following conditions for 5 minutes or more Vehicle speed 5 km h 3 MPH or more Does the value of VHCL HEIGHT SEN change YES gt gt INSPECTION END NO Go to SCS 81 Diagnosis Procedure Diagnosis Procedure INFOID O000000006256077 1 APPEARANCE Visually check for installation malfunction or deformation of vehicle height sensor 15 the inspection result normal
58. elizer control module harness connector and ground Air levelizer control module Voltage Connector Terminal B84 3 Ground OV Are the inspection results normal YES gt gt NO gt gt Repair or replace damaged part INTERMITTENT INCIDENT Refer to GI 40 Intermittent Incident Is the inspection result normal YES gt gt Replace the air levelizer control module Refer to SCS 94 Removal and Installation NO Repair or replace damaged parts 4 CHECK AIR COMPRESSOR RELAY GROUND 1 Turn ignition switch OFF 2 Check continuity between air compressor relay harness connector and ground Air compressor relay Continuity Connector Terminal E116 1 Ground Existed Is the inspection result normal YES gt gt 5 gt gt Repair or replace damaged part 5 CHECK AIR COMPRESSOR RELAY 1 Remove the air compressor relay Refer to SCS 50 Component Parts Location 2 Check continuity between air compressor relay harness connector terminals Air compressor relay ontinuity Terminal 1 2 Existed Is the inspection result normal YES gt gt Check intermittent incident Refer to GI 40 Intermittent Incident NO gt gt Replace the air compressor relay Refer to SCS 50 Component Parts Location Revision 2010 May SCS 73 2011 QX56 C1803 AIR SUSPENSION SOL lt DTC CIRCUIT DIAGNOSIS gt AIR LEVELIZER CONTROL SYSTEM C1
59. escription DTC Logic Diagnosis Procedure POWER SUPPLY AND GROUND CIRCUIT Diagnosis Procedure CK SUSP INDICATOR LAMP CIRCUIT Description Component Function Check Diagnosis Procedure SYMPTOM DIAGNOSIS VEHICLE HEIGHT CANNOT BE RAISED Description Diagnosis Procedure VEHICLE HEIGHT CANNOT BE LOWERED Description Revision 2010 May 87 Diagnosis Procedure 92 87 eg CK SUSP INDICATOR LAMP DOES TURN Bo iE 93 88 Descriptio o 93 88 Diagnosis Procedure 93 88 gg REMOVAL AND INSTALLATION 94 89 LEVELIZER CONTROL MODULE 94 89 Exploded View 94 Removal and Installation 94 90 Adjustment cidunt d 94 90 90 AIR COMPRESSOR AIR TUBE 95 90 Exploded 95 Removal and Installation 95 91 gite ed 97 91 VEHICLE HEIGHT SENSOR 98 91 Exploded View 98 91 Removal and Installation 98 Adjustment ih cena a E 99 92 92 SCS 3 2011 QX56 PRECAUTIONS lt PRECAUTION gt HBMC PRECAUTION PRECAUTIONS Precaution for Supplemental Res
60. fuse between the terminals when applying the voltage 3 Check continuity between air compressor relay terminals 3 and 5 o Air compressor relay Condition Continuity Terminal 2 1 Apply 12 V direct current between terminals 2 and 1 Existed Does not apply 12 V direct current between terminals 2 and 1 Not existed Is the inspection result normal YES gt gt INSPECTION END NO Replace the air compressor relay Refer to SCS 50 Component Parts Location Component Inspection Air Compressor INFOID 0000000006256073 CAUTION Keep the inside of air compressor free of dust 1 AIR COMPRESSOR 1 Remove the air compressor Refer to SCS 95 Removal and Installation 2 Apply 12 V direct current between air compressor terminals 1 and 2 CAUTION Never make the terminals short Connect the fuse between the terminals when applying the voltage fuse Air compressor Condition Status Terminal 1 2 Apply 12 V direct current between terminals 1 and 2 Air flows from air exhaust holes Is the inspection result normal YES gt gt INSPECTION END NO gt gt Replace the air compressor Refer to SCS 95 Removal and Installation Revision 2010 May 5 5 79 2011 56 C1805 VHCL HEIGHT ADJ DOWN lt DTC CIRCUIT DIAGNOSIS gt AIR LEVELIZER CONTROL SYSTEM C1805 VHCL HEIGHT ADJ DOWN DTC Logic INFOID 0000000006256074 DTC DETECTION LO
61. g side the gas spring conveys oil from the oil chamber to both front and rear shock absorbers and decreases pressure according to the oil level JSEIA0176ZZ 1 Oil chamber 2 Gas chamber 3 Bellows PPMU Pipe INFOID 0000000006256005 PPMU and right and left tubes are connected When oil increases according to increase of system pressure increased amount of oil is sent to PPMU When system pressure decreases oil discharged from PPMU is sent to right and left tubes Revision 2010 May SCS 11 2011 QX56 SYSTEM lt SYSTEM DESCRIPTION gt HBMC SYSTEM System Diag ram INFOID 0000000006256006 Accumulator RH Front shock absorber RH Air bleeder a Vehicle front Orifice Front shock absorber LH Rear shock absorber LH Needle valve D valve B _ Needle valve C Needle valve Oil injection jack JSEIA0179GB System Description INFOID 0000000006256007 Drivability during cornering and driving on rough road is improved by mechanically generating oil pressure by connecting 4 units of shock absorbers to front rear right and left by piping lines of 2 systems Oil filling and system diagnosis can be performed using PPMU OPERATING PRINCIPLE During cornering Front and rear wheels in the outer side of corner compressing When shock absorber in the outer side of corner is compressed during cornering oil moves along piping path and overflowing oil from piping path flows in accumulator
62. he terminals short Connect the fuse between the terminals when applying the voltage fuse c C1803 AIR SUSPENSION EXH SOL AIR LEVELIZER CONTROL SYSTEM JSEIA02482Z Air compressor Condition Status Terminal Apply 12 V between air compressor connector terminal 1 and 2 Ataauaenesdieremainsat 1 2 until the air gauge reading reaches approximately 500 mm Hg gaug 0 67 MPa the pressurized position 5 Apply 12 V between air compressor connector terminal 3 and 4 for approximately 2 seconds CAUTION Never make the terminals short Connect the fuse between the terminals when applying the voltage 4 fuse Air compressor Terminal Condition Status 4 3 Apply 12 V between air compressor connector terminal 3 and 4 Air gauge reading lowers and for approximately 2 seconds It takes approximately 2 minutes for the air gauge needle to stop moving Is the inspection result normal YES gt gt INSPECTION END NO gt gt Replace the air compressor Refer to Revision 2010 May SCS 76 the needle stops moving SCS 95 Removal and Installation 2011 QX56 C1804 VHCL HEIGHT ADJ UP lt DTC CIRCUIT DIAGNOSIS gt AIR LEVELIZER CONTROL SYSTEM C1804 VHCL HEIGHT ADJ UP DTC Logic INFOID 0000000006256070 DTC DETECTION LOGIC DTC Display item Malfunction detected condition Possible cause Harness or connector Air compressor Ai
63. ic circuit since dangerous conditions may be created when oil leakage occurs during air bleeding operation CAUTION Clean surrounding areas of oil injection jack and air bleeder using steam before starting operation since there may be mud on it Clean suspension oil pump special service tool KV40107700 jack with steam before use Check system pressure again 1 day or more after bleeding operation is complete since system pres sure may decrease when air bleeding is insufficient Lift up the vehicle Remove protector of PPMU Remove cap of oil injection jack Install hose A of a suspension oil pump SST KV40107700 to oil injection jack CAUTION Jack must be securely inserted until a click sound can be heard gt JSEIA01892Z 5 Loosen pressure reducing valve A of hose portion of suspen sion oil pump JSEIA01902Z 6 Setknob A of suspension oil pump to the direction as shown in the figure 7 Close pressure reducing valve of hose portion of suspension oil pump while sending oil by applying pressure using suspension oil pump Air bleeding in hose is complete JSEIA01912Z Revision 2010 May SCS 18 2011 QX56 AIR BLEEDING METHOD lt BASIC INSPECTION gt HBMC 8 10 11 12 13 14 15 16 17 18 19 20 Loosen needle valves A C and E of PPMU by approximately 2 rotations CAUTION Never loosen the needle valve more than required Install bleeder tu
64. imately 2 rotations CAUTION Never loosen the needle valve more than required 13 Read a value of oil pressure gauge 14 Compare difference of reading with pressure reading in step 9 JSEIA0187ZZ Pressure difference 0 1 MPa or more Normal 0 1 MPa or less Malfunction 15 Tighten needle valves A C and E of PPMU to the specified torque 8 3 N m 0 85 kg m 73 in Ib 16 Loosen needle valves B and D of PPMU by approximately 2 rotations and then tighten lock nut to the specified torque CAUTION Never loosen the needle valve more than required Revision 2010 May SCS 20 2011 QX56 CHECK INTERNAL LEAKAGE lt BASIC INSPECTION gt HBMC 0 20 N m 2 0 kg m 15 ft lb 17 Loosen pressure reducing valve A of oil pressure gauge and lower pressure CAUTION Be careful since oil drains swiftly from oil drain hole B 18 Check that reading of oil pressure gauge is 0 MPa 19 Remove oil pressure gauge JSEIA0188ZZ Revision 2010 May SCS 21 2011 QX56 CHECK FOR MALFUNCTION lt BASIC INSPECTION gt HBMC CHECK FOR MALFUNCTION Work Procedure INFOID 0000000006256013 CAUTION Clean surrounding areas of oil injection jack using steam before starting operation since there may be mud on it Clean oil pressure gauge special service tool KV40108000 jack with steam before use 1 Remove protector of PPMU 2 Remove cap of oil injection jack 3 Install an oil pressure gauge SST KV40108000 A t
65. inside With the pressure difference between oil flowed into the upper chamber and lower chamber the piston 2 moves up and down and conveys a force generated through this motion to the tires JSEIA0245ZZ 3 Lower chamber 1 Upper chamber 2 Piston A Oil inlet outlet hole B Oil inlet outlet hole lt Vehicle upper U INFOID 0000000006256003 PPMU stands for Passive Pressure Maintenance Unit System pressure increases according to increase of oil volume due to oil temperature increase Sudden rise in system pressure can be controlled by feeding the increased oil into the PPMU Oil flows into oil chamber via PPMU pipe A and PPMU pipe B by influence of pressure change pushes gas spring of nitrogen gas and pools Revision 2010 May SCS 10 2011 QX56 STRUCTURE AND OPERATION lt SYSTEM DESCRIPTION gt HBMC When system pressure decreases influent oil is distributed to both pipes by gas spring reaction force of nitrogen gas via PPMU pipe A and PPMU pipe B to control sudden decrease in system pressure JSEIA01752Z 1 Oil chamber 2 Bellows 3 Gas chamber Acc lator INFOID 0000000006256004 Influent oil from both front and rear shock absorbers on the outer ring flows simultaneously into the oil cham ber during cornering and gas spring reaction force of nitrogen gas increases pressure according to the influ ent oil level As for inner rin
66. inspection result normal YES gt gt GOTO3 NO Repaire or replace damaged parts AIR COMPRESSOR RELAY POWER SUPPLY 1 Turn ignition switch OFF 2 Check 30A fuse 1 3 Disconnect air compressor relay connector 4 Check voltage between air compressor relay harness connector and ground Revision 2010 May SCS 77 2011 QX56 C1804 VHCL HEIGHT ADJ UP lt DTC CIRCUIT DIAGNOSIS gt Air compressor relay Connector Terminal AIR LEVELIZER CONTROL SYSTEM Voltage E116 Is the inspection result normal YES NO gt gt GO TO 4 gt gt Repair or replace damaged part 5 Ground Battery voltage 4 CHECK AIR COMPRESSOR RELAY OUTPUT CIRCUIT 1 Turn ignition switch OFF 2 Disconnect air compressor connector 3 Check continuity between air compressor relay harness connector and air compressor harness connector Air compressor relay Air compressor M Continuity Connector Terminal Connector Terminal E116 3 C12 1 Existed 4 Check continuity between air compressor relay harness connector and ground Air compressor relay Continuity Connector Terminal E116 3 Ground Not existed Are the inspection results normal YES GO TOb NO Repair or replace damaged part 5 CHECK AIR COMPRESSOR GROUND Check continuity between air compressor harness connector and ground Air compressor AL Continuity Connector Terminal C12 2 Ground E
67. inuity between air compressor harness connector and ground Air compressor M Continuity Connector Terminal C12 2 Ground Existed Are the inspection results normal YES gt gt 6 gt gt Repair or replace damaged part AIR COMPRESSOR RELAY Check the air compressor relay Refer to Is the inspection result normal YES gt gt GOTO7 NO gt gt Replace the air compressor relay T CHECK AIR COMPRESSOR Check the air compressor Refer to SCS 79 Component Inspection Air Compressor Is the inspection result normal YES gt gt GOTO8 NO Replace the air compressor Refer to SCS 95 Removal and Installation INTERMITTENT INCIDENT Refer to 40 Intermittent Incident Is the inspection result normal YES gt gt 1 Perform STANDARD VEHICLE HEIGHT SETTING Refer to SCS 67 Work Procedure 2 If DTC is detected replace the air levelizer control module Refer to SCS 94 Removal and Installation SCS 79 Component Inspection Air Compressor Relay Revision 2010 May SCS 85 2011 QX56 C1808 AIR SUS 5 lt DTC CIRCUIT DIAGNOSIS gt AIR LEVELIZER CONTROL SYSTEM NO gt gt Repair or replace damaged part Revision 2010 May SCS 86 2011 QX56 01000 COMM CIRCUIT lt DTC CIRCUIT DIAGNOSIS gt AIR LEVELIZER CONTROL SYSTEM U1000 CAN COMM CIRCUIT D e 5 ri pt n INFOID 0000000006256082 CAN Controller Area Networ
68. joint B 5 Disconnect pipe of accumulator assembly LH from left side middle joint B JSEIA0199ZZ 6 Disconnect PPMU pipe A A from left side middle joint B 7 Separate chassis and body Refer to DLK 251 Removal and Installation 8 Remove mounting bolts of each bracket 9 Remove middle tube assembly LH from the vehicle 10 Perform inspection after removal Refer to SCS 43 PPMU MIDDLE TUBE ASSEMBLY PPMU PIPE Inspection JSEIA0205ZZ Revision 2010 May 5 5 40 2011 56 HYDRAULIC BODY MOTION CONTROL SYSTEM lt REMOVAL AND INSTALLATION gt HBMC Middle Tube Assembly RH from Rear Shock Absorber RH Upper to Right Side Middle Joint 1 Reduce system pressure Refer to SCS 17 Work Procedure 2 Disconnect upper side pipe A of rear shock absorber RH B Lower side pipe 3 Disconnect pipe A of rear tube assembly A from right side rear joint B 4 Remove pipe A of accumulator assembly RH from right side middle joint B 5 Disconnect PPMU pipe B A from right side middle joint B 6 Separate chassis and body Refer to DLK 251 Removal and Installation 7 Remove mounting bolts of each bracket 8 Remove middle tube assembly RH from the vehicle 9 Perform inspection after removal Refer to SCS 43 PPMU MIDDLE TUBE ASSEMBLY PPMU PIPE Inspection PPMU pipe A and PPMU pipe B Reduce system pressure Refer to SCS 17 Work Procedure
69. k is a serial communication line for real time application It is an on vehicle mul tiplex communication line with high data communication speed and excellent malfunction detection ability Many electronic control units are equipped onto a vehicle and each control unit shares information and links with other control units during operation not independently In CAN communication control units are con nected with 2 communication lines CAN H line CAN L line allowing a high rate of information transmission with less wiring Each control unit transmits receives data but selectively reads required data only D T C Lo INFOID 0000000006256083 DETECTION LOGIC DTC Display Malfunction detected condition Possible cause Harness or connectors CAN communication line is open or shorted Air levelizer control module Air levelizer control module is not transmitting or re U1000 CAN COMM CIRCUIT ceiving CAN communication signal for 2 seconds or more DTC CONFIRMATION PROCEDURE 1 PRECONDITIONING If DTC CONFIRMATION PROCEDURE is previously conducted always turn ignition switch OFF and wait at least 10 seconds before performing the next test gt gt GO TO 2 2 DTC DETECTION With CONSULT III 1 Start the engine 2 Run engine for at least 2 consecutive seconds at idle speed 3 Perform Self Diagnostic Results in E SUS Is U1000 detected YES gt gt Go to S
70. l module connector Revision 2010 May SCS 69 2011 QX56 C1801 VHCL HEIGHT SENSOR lt DTC CIRCUIT DIAGNOSIS gt AIR LEVELIZER CONTROL SYSTEM 3 Check continuity between air levelizer control module harness connector and vehicle height sensor har ness connector Air levelizer control module Vehicle height sensor Continuity Connector Terminal Connector Terminal B84 13 C13 1 Existed 4 Check continuity between air levelizer control module harness connector and ground Air levelizer control module 2 Continuity Connector Terminal B84 13 Ground Not existed Is the inspection result normal YES gt gt 1 Check intermittent incident Refer to GI 40 Intermittent Incident 2 If inspection result is OK replace the air levelizer control module Refer to SCS 94 Removal and Installation NO Repair or replace damaged parts HARNESS BETWEEN AIR LEVELIZER CONTROL MODULE AND VEHICLE HEIGHT SENSOR 1 Turn ignition switch OFF 2 Disconnect air levelizer control module connector 3 Check continuity between air levelizer control module harness connector and vehicle height sensor har ness connector Air levelizer control module Vehicle height sensor zz Continuity Connector Terminal Connector Terminal 5 2 B84 C13 Existed 4 3 4 Check continuity between air levelizer control module harness connector and ground Air levelizer contr
71. m For removal of Spiral Cable and Air Bag Module see the SRS AIR Do not use electrical test equipment on any circuit related to the SRS unless instructed to in this Service Manual SRS wiring harnesses can be identified by yellow and or orange harnesses or har ness connectors PRECAUTIONS WHEN USING POWER TOOLS AIR OR ELECTRIC AND HAMMERS WARNING When working near the Air Bag Diagnosis Sensor Unit or other Air Bag System sensors with the ignition ON or engine running DO NOT use air or electric power tools or strike near the sensor s with a hammer Heavy vibration could activate the sensor s and deploy the air bag s possibly causing serious injury When using air or electric power tools or hammers always switch the ignition OFF disconnect the battery and wait at least 3 minutes before performing any service Precaution Necessary for Steering Wheel Rotation after Battery Disconnect INFOID 0000000006256137 NOTE Before removing and installing any control units first turn the push button ignition switch to the LOCK posi tion then disconnect both battery cables After finishing work confirm that all control unit connectors are connected properly then re connect both battery cables Always use CONSULT III to perform self diagnosis as part of each function inspection after finishing work If a DTC is detected perform trouble diagnosis according to self diagnosis results For vehicle with steering l
72. me DTCs are detected at the some time determine the order for performing the diagnosis based SCS 59 DTC Inspection Priority Chart Is any DTC detected YES gt gt TOb NO gt gt Check harness and connectors based on the information obtained by interview Refer to GI 40 Intermittent Incident 5 REPLACE ERROR DETECTED PART Repair or replace error detected parts Reconnect part or connector after repairing or replacing When DTC is detected erase self diagnostic result for E SUS gt gt GO 7 6 IDENTIFY ERROR DETECTED SYSTEM BY SYMPTOM DIAGNOSIS Estimate error detected system based on symptom diagnosis and perform inspection Can the error detected system be identified Revision 2010 May SCS 65 2011 QX56 DIAGNOSIS AND REPAIR WORKFLOW lt BASIC INSPECTION gt AIR LEVELIZER CONTROL SYSTEM YES gt gt GOTO7 NO gt gt Check harness and connectors based on the information obtained by interview Refer to Gl 40 Intermittent Incident 7 FINAL CHECK 8 With CONSULT III 1 Check the reference value for E SUS 2 Recheck the symptom and check that the symptom is not reproduced on the same conditions 15 the symptom reproduced YES gt gt gt gt INSPECTION END D n Ost Wo rk 5 h eet INFOID 0000000006256059 Description general customers have their own criteria for a problem Therefore it is important to understand
73. mulative operating time of the air compressor Vehicle height sensor reaches 180 seconds or more Air compressor exhaust sole NOTE noid Cumulative time is cleared under the following condi Air compressor relay C1808 AIR SUS COMPRS FNCTN tions Overloaded Ignition switch OFF Rear shock absorber air cham Exhaust conditions satisfied Vehicle height re ber mains 15 mm 0 59 in more higher than the ref Rear suspension component erence height for 30 seconds parts Airtube DTC CONFIRMATION PROCEDURE 1 PRECONDITIONING If CONFIRMATION PROCEDURE has been previously conducted always turn ignition switch OFF andwait at least 10 seconds before conducting the next test gt gt GO TO 2 2 CHECK DTC DETECTION 8 With CONSULT III 1 Setvehicle in the unloaded vehicle status 2 Start the engine and wait 5 minutes or more 3 Perform Self Diagnostic Result in E SUS Is C1808 detected YES gt gt Go to SCS 84 Diagnosis Procedure NO gt gt INSPECTION END Diagnosis Procedure INFOID O000000006256081 1 APPEARANCE Visually check for malfunction of suspension components damage of air chamber of rear shock absorber installation malfunction or deformation of vehicle height sensor Is the inspection result normal YES gt gt 2 NO Repaire or replace damaged parts 2 CHECK AIR LEAK Apply soapy water to air tube connecting por
74. nch 2 Secure tank using a vise 3 Drill a hole as shown in the figure using an electric drill Drain gas and oil NOTE Gas is colorless odorless and harmless Use an electric drill with a drill bit of approximately 4 mm 0 16 in Drilling a hole is easier when electric drill speed is slow 6 JSEIA0182ZZ REAR TUBE ASSEMBLY Revision 2010 May SCS 43 2011 QX56 HYDRAULIC BODY MOTION CONTROL SYSTEM lt REMOVAL AND INSTALLATION gt HBMC REAR TUBE ASSEMBLY T Exploded View INFOID 0000000006256032 SEC 432 5 0 0 51 44 gms 1 3 10 5 0 0 51 44 JSEIA0247GB 1 Rear tube assembly 2 O ring 3 Rear tube assembly B lt Vehicle front Apply genuine NISSAN hydraulic suspension fluid Refer to Gl 4 Components for symbols not described on the above REAR TUBE ASSEMBLY Removal and Installation INFOID 0000000006256033 REMOVAL Rear Tube Assembly A from Rear Shock Absorber LH Lower to Right Side Rear Joint 1 Reduce system pressure Refer to SCS 17 Work Procedure 2 Remove rear muffler Refer to 5 Removal and Installation Revision 2010 May 5 5 44 2011 QX56 HYDRAULIC BODY MOTION CONTROL SYSTEM lt REMOVAL AND INSTALLATION gt HBMC 3 Remove lower side pipe A of rear shock absorber LH 4 Remove pipe A from left side rear joint B 5 Remove lower side pipe A of rear shock absorber RH 6 Remove pipe A from right side
75. ng Diagram WIRING DIAGRAM lt WIRING DIAGRAM gt Gen el so oloz 8 asns xo sa amp 8 NOLIVNISINOO ec 12 HE 1 oor noui ueisfs assumi a 091 WeIshs OL L4 HESSE dace E m ANI viva Mm CD HOLO3NNOO SNM D AVM31VO N oh v S l JINON H3ZIT3A31UHIV ae ela er WOOH 3NIEN3 190 woe VN Y3 oor nou I0 1591 10 NO oo wim lt OL gt AH3LIvg WALSAS HZZIT3 31 2011 QX56 SCS 61 Revision 2010 May AIR LEVELIZER CONTROL SYSTEM AIR LEVELIZER CONTROL SYSTEM lt WIRING DIAGRAM gt 9s 7 m o ee M anM JO uoneoyroods jeudi X eam jo 5 35 LHDISH FTOIHSA 10 AlddNS GIONSIOS LSNYHX3 v ANNOYS HOSS3HdWOO 2225 0154 8498 5 u3MOd 305533409 85 uoneoysadg Ls T5 vs T rt GIONS TOS ISAYA
76. nition switch ON 2 Select Self Diagnostic Result in E SUS Are any DTC detected YES gt gt Refer to SCS 59 DTC Index NO gt gt GO TO 3 PERFORM STANDARD VEHICLE HEIGHT SETTING Refer to SCS 67 Work Procedure Is the symptom improved YES gt gt INSPECTION END NO gt gt Replace the air levelizer control module Refer to SCS 94 Removal and Installation Revision 2010 May SCS 91 2011 QX56 VEHICLE HEIGHT CANNOT LOWERED lt SYMPTOM DIAGNOSIS gt AIR LEVELIZER CONTROL SYSTEM VEHICLE HEIGHT CANNOT BE LOWERED D esc ri pti n INFOID 0000000006256094 Vehicle height remains in high status Diagnosis Procedure INFOID o000000006256095 1 APPEARANCE Visually check for fuse malfunction of suspension components installation malfunction or deformation of vehicle height sensor Is the inspection result normal YES gt gt 2 NO Repaire or replace damaged parts 2 PERFORM SELF DIAGNOSIS 1 Turn ignition switch ON 2 Select Self Diagnostic Result in E SUS Are any DTC detected YES gt gt Refer to SCS 59 DTC Index NO gt gt GO TO3 3 PERFORM STANDARD VEHICLE HEIGHT SETTING Refer to SCS 67 Work Procedure Is the symptom improved YES gt gt INSPECTION END NO gt gt Replace the air levelizer control module Refer to SCS 94 Removal and Installation Revision 2010 May 5 5 92 2011 56 CK SUSP INDICATOR LAMP DOES TURN OFF
77. nstall in the reverse order of removal Adj 51 INFOID 0000000006256100 After air levelizer control module is replaced perform STANDARD VEHICLE HEIGHT SETTING Refer to SCS 67 Work Procedure Revision 2010 May SCS 94 2011 QX56 AIR COMPRESSOR AIR TUBE lt REMOVAL AND INSTALLATION gt AIR LEVELIZER CONTROL SYSTEM AIR COMPRESSOR AIR TUBE Exploded View INFOID 0000000006256101 SEC 432 17 1 7 13 JSEIA0227GB 1 Airtube A 2 Air tube B 3 Bracket 4 Air compressor 5 6 Cover 7 Insulator 8 Washer 9 Exhausttube 10 Exhaust tube connector A Torear shock absorber RH To rear shock absorber LH C Toframe lt Vehicle front Refer to GlI 4 Components for symbols not described on the above Removal and Installation INFOID 0000000006256102 REMOVAL CAUTION Seal the removed part using vinyl tape for preventing dirt from getting on or entering the removed part 1 Liftup the vehicle 2 Remove the cover 3 Disconnect the air compressor harness connector Revision 2010 May SCS 95 2011 QX56 COMPRESSOR AIR TUBE lt REMOVAL AND INSTALLATION gt AIR LEVELIZER CONTROL SYSTEM 4 Using a small spanner remove the air tube A 1 and 2 from air compressor CAUTION Be careful since air flows swiftly from air tube JSEIA0238ZZ Remove the exhaust tube 1 from exhaust tube connector 2 Remove the exhaust tube connector only when it is damaged
78. o oil injec tion jack CAUTION Jack must be securely inserted until a click sound can be heard Pressure reducing valve B of the oil pressure gauge must be closed JSEIA01862Z 4 Loosen needle valves A C and E of PPMU by approximately 2 rotations CAUTION Never loosen the needle valve more than required 5 Lift up the vehicle CAUTION Check that tires never contact the ground 6 Tighten needle valves A and of PPMU 7 Loosen lock nuts of needle valves B and D of PPMU and then tighten needle valves B and D 8 Write down a value of the oil pressure gauge 9 Lift down the vehicle CAUTION Check that the lift is fully lowered 10 Read a value of oil pressure gauge 11 Compare difference of reading with pressure reading in step 8 JSEIA0187ZZ Pressure change Pressure increases PPMU malfunction Pressure does not change Shock absorber malfunction 12 Tighten needle valves A C and E of PPMU to the specified torque Tightening torque 8 3 N m 0 85 kg m 73 in Ib 13 Loosen needle valves B and D of PPMU by approximately 2 rotations and then tighten lock nut to the specified torque CAUTION Never loosen the needle valve more than required Tightening torque 20 N m 2 0 kg m 15 ft Ib Revision 2010 May SCS 22 2011 QX56 CHECK FOR MALFUNCTION lt BASIC INSPECTION gt HBMC 14 Loosen pressure reducing valve A of oil pressure gauge and then lower pressure CAUTION Be careful since
79. ock unit if the battery is disconnected or discharged the steering wheel will lock and cannot be turned If turning the steering wheel is required with the battery disconnected or discharged follow the operation pro cedure below before starting the repair operation OPERATION PROCEDURE 1 Connect both battery cables NOTE Supply power using jumper cables if battery is discharged 2 Turn the push button ignition switch to ACC position At this time the steering lock will be released 3 Disconnect both battery cables The steering lock will remain released with both battery cables discon nected and the steering wheel can be turned 4 Perform the necessary repair operation Revision 2010 May 5 5 47 2011 56 PRECAUTIONS lt PRECAUTION gt AIR LEVELIZER CONTROL SYSTEM 5 When the repair work is completed re connect both battery cables With the brake pedal released turn the push button ignition switch from ACC position to ON position then to LOCK position The steering wheel will lock when the push button ignition switch is turned to LOCK position 6 Perform self diagnosis check of all control units using CONSULT III Precaution for Procedure without Cowl Top Cover INFO10 0000000006256139 When performing the procedure after removing cowl top cover cover the lower end of windshield with urethane etc PIIB3706J Precaution for Air Levelizer Control System INFOID 0000000006256038 Never allow
80. oil drains swiftly from oil drain hole B 15 Check that reading of oil pressure gauge is 0 MPa 16 Remove oil pressure gauge JSEIA0188ZZ Revision 2010 May SCS 23 2011 QX56 CHECK SHOCK ABSORBER FOR MALFUNCTION lt BASIC INSPECTION gt CHECK SHOCK ABSORBER FOR MALFUNCTION Work Procedure CAUTION HBMC INFOID 00000000062560 14 Clean surrounding areas of oil injection jack using steam before starting operation since there may be mud on it Clean suspension oil pump special service tool KV40107700 jack with steam before use Clean leak check plug special service tool KV40108400 jack with steam before use Check each shock absorber one by one in accordance with the following procedures Lift up the vehicle Remove protector of PPMU Remove cap of oil injection jack Install hose A of a suspension oil pump SST KV40107700 to oil injection jack CAUTION Jack must be securely inserted until a click sound can be heard Pressure reducing valve B of the suspension oil pump must be closed eO 5 Loosen needle valves of PPMU by approximately 2 rotations CAUTION Never loosen the needle valve more than required 6 Set knob A of suspension oil pump to the direction as shown in the figure and check that reading of pressure gauge is 0 MPa 7 Tighten needle valves A C and E of PPMU 8 Disconnect upper side pipe or lower side pipe of each shock abs
81. ol module m Continuity Connector Terminal 5 B84 i Ground Not existed Are the inspection results normal YES gt gt GOTOS5S NO Repair or replace damaged parts VEHICLE HEIGHT SENSOR Check the vehicle height sensor Refer to SCS 70 Component Inspection Is the inspection result normal YES gt gt GOTO6 NO Replace the vehicle height sensor Refer to SCS 98 Removal and Installation 6 cHECK INTERMITTENT INCIDENT Refer to 40 Intermittent Incident Is the inspection result normal YES gt gt Replace the air levelizer control module Refer to SCS 94 Removal and Installation NO Repair or replace damaged parts Component Inspection INFOID 2000000006256064 1 VEHICLE HEIGHT SENSOR Revision 2010 May SCS 70 2011 QX56 C1801 HEIGHT SENSOR lt DTC CIRCUIT DIAGNOSIS gt AIR LEVELIZER CONTROL SYSTEM 1 Remove the vehicle height sensor Refer to SCS 98 Removal and Installation 2 Check resistance between vehicle height sensor connector ter minals Vehicle height sensor m EI Condition Resistance Approx 5 A position 1 9 3 0 position 320 680 Q 1 3 Always 1 6 2 4 KQ B 3 A position 320 6800 JSEIA02492Z B position 1 9 3 0 Are the inspection results normal YES gt gt 1 Install the vehicle height sensor Refer to SCS 94 Removal and Installation 2 Perform STANDARD VEHI
82. orber For front shock absorber Revision 2010 May SCS 24 JSEIA02442Z JSEIA0187ZZ JSEIA01932Z 2011 QX56 CHECK SHOCK ABSORBER FOR MALFUNCTION lt BASIC INSPECTION gt HBMC Disconnect upper side pipe B of front shock absorber A Lower side pipe For rear shock absorber Disconnect lower side pipe B of rear shock absorber A Upper side pipe JSEIA0203ZZ 9 Install a leak check plug SST KV40108400 A to the removed pipe and tighten the leak check plug to the specified torque CAUTION O ring must be free of scratches and damage Piping must be kept free of the intrusion of dust and dirt Tightening torque 5 0 N m 0 51 kg m 44 in Ib 10 Loosen lock nuts of needle valves B and D of PPMU and then tighten needle valves B and D 11 Loosening position of needle valve of PPMU varies according to shock absorber that is checked Loosen needle valve of PPMU by approximately 2 rotations as per the following table CAUTION Never loosen the needle valve more than required JSEIA0210ZZ Shock absorber Loosening position of needle valve Front LH Rear LH C Front RH A Rear RH A 12 Set knob A of suspension oil pump to the direction as shown in the figure 13 Apply pressure of up to 2 4 MPa 14 Go to step 15 when oil comes out from lower portion of shock absorber which pipe is removed from Go to step 16 when oil does not come out 15 Replace shock abs
83. orber since shock absorber has internal leakage Refer to FSU 10 Removal and Installation front RSU 8 Removal and Installation rear JSEIA0191ZZ Revision 2010 May SCS 25 2011 QX56 CHECK SHOCK ABSORBER FOR MALFUNCTION lt BASIC INSPECTION gt HBMC 16 17 18 19 20 21 Shock absorber that is checked is normal Set knob A of sus pension oil pump to the direction as shown in the figure and check that reading of pressure gauge is 0 MPa Tighten the loosened needle valve of PPMU Remove leak check plug from pipe Install pipe to lower portion of shock absorber and tighten pipe to the specified torque CAUTION O ring must be free of scratches and damage Piping must be kept free of the intrusion of dust and dirt Tightening torque 5 0 N m 0 51 kg m 44 in Ib r Check other shock absorbers in accordance with procedures of steps 8 to 18 Tighten needle valves A C and E of PPMU to the specified torque after completion of check Tightening torque 8 3 0 85 kg m 73 in Ib Loosen needle valves B and D of PPMU by approximately 2 rotations and then tighten lock nuts to the specified torque CAUTION Never loosen the needle valve more than required Tightening torque 20 N m 2 0 kg m 15 ft Ib Revision 2010 May SCS 26 2011 QX56 CHECK ORIFICE FOR CLOGGING lt BASIC INSPECTION gt HBMC CHECK ORIFICE FOR CLOGGING Work Procedure INFOID 0000000006256015
84. py water to enter the inside of air compressor Revision 2010 May SCS 97 2011 QX56 VEHICLE HEIGHT SENSOR lt REMOVAL AND INSTALLATION gt AIR LEVELIZER CONTROL SYSTEM VEHICLE HEIGHT SENSOR Exploded View INFOID 0000000006256 104 8 3 0 85 73 JSEIA0226GB 1 Vehicle height sensor lt Vehicle front Refer to GlI 4 Components for symbols not described on the above oval a nd n stal lat n INFOID 0000000006256105 REMOVAL CAUTION Never disassemble the vehicle height sensor 1 Liftup the vehicle 2 Disconnect the vehicle height sensor harness connector 3 Remove the vehicle height sensor INSTALLATION Note the following and install in the reverse order of the removal Completely engage hooks on frame when installing vehicle height sensor JSEIA0243ZZ Revision 2010 May SCS 98 2011 QX56 VEHICLE HEIGHT SENSOR lt REMOVAL AND INSTALLATION gt AIR LEVELIZER CONTROL SYSTEM Adjustment INFOID 0000000006256106 After vehicle height sensor is replaced removal or installation perform STANDARD VEHICLE HEIGHT SET TING Refer to SCS 67 Work Procedure Revision 2010 May SCS 99 2011 QX56
85. r compressor relay Air levelizer control module The vehicle height is 15 mm 0 59 or more lower Rear shock absorber air cham than the reference height despite the output of air C1804 VHCL HEIGHT ADJ UP compressor ON signal continuously for 120 seconds Vehi le height sensor by the air levelizer control module 9 Airtube Rear suspension component parts Overloaded DTC CONFIRMATION PROCEDURE 1 PRECONDITIONING If CONFIRMATION PROCEDURE has been previously conducted always turn ignition switch OFF andwait at least 10 seconds before conducting the next test gt gt GO TO 2 2 CHECK DTC DETECTION With CONSULT III 1 Setvehicle in the unloaded vehicle status 2 Start the engine and wait 150 seconds or more 3 Perform Self Diagnostic Result in E SUS Is C1804 detected YES gt gt Go to SCS 77 Diagnosis Procedure NO gt gt INSPECTION END Diagnosis Procedure INFOID O000000006256071 1 APPEARANCE Visually check for malfunction of suspension components damage of air chamber of rear shock absorber installation malfunction or deformation of vehicle height sensor 15 the inspection result normal YES gt gt GOTO2 NO Repaire or replace damaged parts 2 CHECK AIR LEAK Apply soapy water to air tube connecting portions between air tube and each component and air chamber of rear shock absorber Check for air leakage Is the
86. sor remains 0 2 V or less or 4 6 V or more continuously for 60 seconds during sensor voltage 4 5 5 5 V output by the air lev elizer control module C1801 VHCL HEIGHT SENSOR DTC CONFIRMATION PROCEDURE 1 PRECONDITIONING If CONFIRMATION PROCEDURE has been previously conducted always turn ignition switch OFF andwait at least 10 seconds before conducting the next test gt gt GO TO 2 2 CHECK DTC DETECTION With CONSULT III 1 Turn ignition switch ON and wait 60 seconds or more 2 Perform Self Diagnostic Results in E SUS Is C1801 detected YES gt gt Goto SCS 69 Diagnosis Procedure NO gt gt INSPECTION END Diagnosis Procedure INFOID2000000006256065 1 APPEARANCE Visually check for malfunction of suspension components installing malfunction or deformation of vehicle height sensor Is the inspection result normal YES gt gt 2 NO Repaire or replace damaged parts 2 POWER SUPPLY CIRCUIT PART 1 1 Disconnect vehicle height sensor connector 2 Turn ignition switch ON CAUTION Never start the engine 3 Check voltage between vehicle height sensor harness connector and ground Vehicle height sensor Voltage Connector Terminal C13 1 Ground 4 5 5 5 V Is the inspection result normal YES gt gt GOTO4 NO gt gt GO TO 3 CHECK POWER SUPPLY CIRCUIT PART 2 1 Turn ignition switch OFF 2 Disconnect air levelizer contro
87. stall an oil pressure gauge SST KV40108000 A to oil injec tion jack CAUTION Jack must be securely inserted until a click sound can be heard Pressure reducing valve B of the oil pressure gauge must be closed JSEIA0186ZZ 5 Loosen needle valves A C and E of PPMU by approximately 2 rotations CAUTION Never loosen the needle valve more than required JSEIA0187ZZ 6 Referto the figure and check the specified pressure 7 Tighten needle valves A C and E of PPMU to the specified torque a A e Tightening torque 8 3 0 85 kg m 73 in Ib Pressure MPa 6 5 5 5 4 5 3 5 2 5 1 0 0 5 15 20 25 30 35 40 45 50 82 41 50 59 68 77 86 95 104 113 122 Ambient Temp F 22 Revision 2010 May SCS 15 2011 QX56 CHECK SYSTEM PRESSURE lt BASIC INSPECTION gt HBMC 8 Loosen pressure reducing valve A of oil pressure gauge and then lower pressure CAUTION Be careful since oil drains swiftly from oil drain hole B 9 Check that reading of oil pressure gauge is 0 MPa 10 Remove oil pressure gauge 11 Install cap of oil injection jack 12 Install protector of PPMU Refer to SCS 39 PPMU MIDDLE TUBE ASSEMBLY PPMU PIPE Exploded View JSEIA01882Z Revision 2010 May SCS 16 2011 QX56 PRESSURE REDUCING METHOD lt BASIC INSPECTION gt HBMC PRESSURE REDUCING METHOD Work Procedure INFOID 000000000
88. system malfunction in the past is detected but the system is presently normal IGN COUNTER NOTE Each time when ignition switch is turned OFF to ON numerical number increases in 1 gt 2 gt 3 38 39 When the operation number of times exceeds 39 the number do not increase and 39 is displayed until self diagnosis is erased DATA MONITOR Momitwediem Unt Remaks IGN VOLT V Displays the power supply voltage of air levelizer control module VHCL HT INTLZ STA Displays setting status of standard vehicle height VHCL HT INIT SLCT Displays setting status of standard vehicle height VHCL HEIGHT SEN V Displays the signal voltage of vehicle height sensor VHCL HT CNVSN VL mm Displays the vehicle height recognized by air levelizer control module VHCL HGT FIX TIME hour Displays period of time that signal from vehicle height sensor does not change Revision 2010 May SCS 56 2011 QX56 DIAGNOSIS SYSTEM AIR LEVELIZER CONTROL MODULE lt SYSTEM DESCRIPTION gt AIR LEVELIZER CONTROL SYSTEM Monitored item Unit Remarks Displays voltage when standard vehicle height is set VACC AGT INIT v Value does not change until setting of standard vehicle height is performed again COMPRESSOR Displays operation status of air compressor EXH SOLENOID Displays operation status of exhaust solenoid ENG SPEED SIG Displays operation status of engine WARNING LAMP Displays turning
89. the symptom and status well enough by asking the customer about his her concerns carefully To systemize all the information for the diagnosis prepare the interview sheet referring to the interview points In some cases multiple conditions that appear simultaneously may cause a DTC to be detected INTERVIEW SHEET SAMPLE Interview sheet Custmer MR MS Registration Initial year name number registration Vehicle type VIN Storage date Engine Mileage km Mile Symptom Does not operate function Warning lamp for turns ON Noise Vibration Other First occurrence Recently Other Frequency of occurrence Always O Under a certain conditions of Sometimes time day Climate con Irrelevant ditions Weather Fine Cloud Rain Snow Others Temperature Hot Warm Cool Cold Temp Approx Relative humidity High O Moderate Low Road conditions Urban area Suburb area Highway Mountainous road uphill or downhill Rough road Operating condition etc Irrelevant When engine starts During idling During driving During acceleration At constant speed driving During deceleration During cornering right curve or left curve When steering wheel is steered to right or to left Memo Revision 2010 May SCS 66 2011 QX56 STANDARD VEHICLE HEIGHT SETTING lt BASIC INSP
90. tions between air tube and each component and air chamber of rear shock absorber Check for air leakage Is the inspection result normal YES gt gt GOTO3 NO Repaire or replace damaged parts AIR COMPRESSOR RELAY POWER SUPPLY 1 Turn ignition switch OFF 2 Check 30A fuse 1 3 Disconnect air compressor relay connector 4 Check voltage between air compressor relay harness connector and ground Revision 2010 May SCS 84 2011 QX56 C1808 AIR SUS 5 FNCTN lt DTC CIRCUIT DIAGNOSIS gt Air compressor relay Connector Terminal AIR LEVELIZER CONTROL SYSTEM Voltage E116 Is the inspection result normal YES NO 3 Check continuity between air compressor relay harness connector and air compressor harness connector gt gt GO TO 4 5 gt gt Repair or replace damaged part 4 CHECK AIR COMPRESSOR RELAY OUTPUT CIRCUIT 1 Turn ignition switch OFF 2 Disconnect air compressor connector Ground Battery voltage Air compressor relay Air compressor ae Continuity Connector Terminal Connector Terminal E116 3 C12 1 Existed 4 Check continuity between air compressor relay harness connector and ground Air compressor relay ue Continuity Connector Terminal E116 3 Ground Not existed Are the inspection results normal YES GO TOb NO Repair or replace damaged part AIR COMPRESSOR GROUND Check cont
91. to SCS 82 Diagnosis Procedure NO INSPECTION END Diagnosis Procedure INFOID 0000000006256079 1 POWER SUPPLY CIRCUIT PART 1 1 Disconnect vehicle height sensor connector 2 Turn ignition switch ON CAUTION Never start the engine 3 Check voltage between the vehicle height sensor harness connector and ground Vehicle height sensor Voltage Connector Terminal C13 1 Ground 4 5 5 5 Is the inspection result normal YES gt gt GOTOS NO gt gt GO TO 2 2 POWER SUPPLY CIRCUIT PART 2 1 Turn ignition switch OFF 2 Disconnect air levelizer control module connector 3 Check continuity between air levelizer control module harness connector and vehicle height sensor har ness connector Air levelizer control module Vehicle height sensor 7 Continuity Connector Terminal Connector Terminal B84 13 C13 1 Existed Revision 2010 May SCS 82 2011 QX56 C1807 VHCL HEIGHT SEN VOLT lt DTC CIRCUIT DIAGNOSIS gt AIR LEVELIZER CONTROL SYSTEM 4 Check continuity between air levelizer control module harness connector and ground Air levelizer control module Continuity Connector Terminal B84 13 Ground Not existed Is the inspection result normal YES gt gt 1 Check intermittent incident Refer to 1 40 Intermittent Incident 2 If inspection result is OK replace the air levelizer control module Refer to SCS 94 Removal
92. traint System SRS AIR BAG and SEAT BELT PRE TENSIONER inFo10 0000000006256134 The Supplemental Restraint System such as AIR BAG and SEAT BELT PRE TENSIONER used along with a front seat belt helps to reduce the risk or severity of injury to the driver and front passenger for certain types of collision This system includes seat belt switch inputs and dual stage front air bag modules The SRS system uses the seat belt switches to determine the front air bag deployment and may only deploy one front air bag depending on the severity of a collision and whether the front occupants are belted or unbelted Information necessary to service the system safely is included in the SRS AIR BAG and SEAT BELT of this Service Manual WARNING To avoid rendering the SRS inoperative which could increase the risk of personal injury or death in the event of a collision that would result in air bag inflation all maintenance must be performed by an authorized NISSAN INFINITI dealer Improper maintenance including incorrect removal and installation of the SRS can lead to personal injury caused by unintentional activation of the system For removal of Spiral Cable and Air Bag Module see the SRS AIR BAG Do not use electrical test equipment on any circuit related to the SRS unless instructed to in this Service Manual SRS wiring harnesses can be identified by yellow and or orange harnesses or har ness connectors PRECAUTIONS WHEN U
93. ttery cables NOTE Supply power using jumper cables if battery is discharged 2 Turn the push button ignition switch to ACC position At this time the steering lock will be released 3 Disconnect both battery cables The steering lock will remain released with both battery cables discon nected and the steering wheel can be turned 4 Perform the necessary repair operation Revision 2010 May SCS 4 2011 QX56 PRECAUTIONS lt PRECAUTION gt HBMC 5 When the repair work is completed re connect both battery cables With the brake pedal released turn the push button ignition switch from ACC position to ON position then to LOCK position The steering wheel will lock when the push button ignition switch is turned to LOCK position 6 Perform self diagnosis check of all control units using CONSULT III Precaution for Procedure without Cowl Top Cover 0 0000000008256138 When performing the procedure after removing cowl top cover cover the lower end of windshield with urethane etc PIIB3706J Precaution for Hydraulic Body Motion Control System inFo10 0000000006255896 WARNING Always check the piping for loose connections damage or twists before starting operation since pressure in hydraulic circuit becomes high during air bleeding operation When repairing or replacing a malfunctioning part always release pressure from hydraulic circuit since dangerous conditions may be created when oil leakage occurs
94. tting of standard vehicle height is incomplete NOTE Does not turn ON when the system is malfunctioning Revision 2010 May SCS 51 2011 QX56 STRUCTURE AND OPERATION lt SYSTEM DESCRIPTION gt AIR LEVELIZER CONTROL SYSTEM STRUCTURE AND OPERATION Rear Shock Absorber Discharges air in air chamber 2 from air valve 1 when vehicle height of vehicle rear is higher than stan dard vehicle height has shock absorber stroke in compressed direction lowers vehicle height and returns it to standard vehicle height Also charges air in air chamber from air valve when height of vehicle rear is lower than standard vehicle height has shock absorber stroke in extending direction raises vehicle height and returns it to standard vehicle height Charged air because of rubber 3 that is hard and located on side surface does not expand in lateral direc tion but expands in vertical direction and enables shock absorber to extend or retract Without Hydraulic Body Motion Control System ih 1 26 2 7 JSEIA0217ZZ 1 Air valve 2 Air chamber 3 Rubber A Stroke lt Vehicle upper With Hydraulic Body Motion Control System JSEIA0218ZZ 1 Air valve 2 Air chamber 3 Rubber A Stroke lt Vehicle upper Revision 2010 May SCS 52 2011 QX56 STRUCTURE AND OPERATION lt SYSTEM DESCRIPTION gt AIR LEVELIZER CONTROL SYSTEM Ve h
95. water and dust to enter the inside of air compressor Never disassemble the vehicle height sensor Revision 2010 May SCS 48 2011 QX56 DESCRIPTION lt SYSTEM DESCRIPTION gt AIR LEVELIZER CONTROL SYSTEM SYSTEM DESCRIPTION DESCRIPTION D e 5 C ri pt n INFOID 0000000006256039 Corrects sinkage of vehicle rear that occurs in laden or towing conditions Maintains vehicle height at a constant level and improves riding comfort by charging or discharging air in air chamber of rear shock absorber according to signal from vehicle height sensor installed to rear suspension Revision 2010 May SCS 49 2011 QX56 5 lt SYSTEM DESCRIPTION gt AIR LEVELIZER CONTROL SYSTEM COMPONENT PARTS Component Parts Location INFo10 0000000006256040 JSEIA0223GB 1 Combination meter 2 CK SUSP indicator lamp 3 Air levelizer control module Refer to MWI 6 METER SYSTEM Component Parts Location 4 Air compressor relay 5 Air chamber 6 Air compressor 7 Vehicle height sensor A Inside of luggage side finisher low B Engine room RH C Rear shock absorber er LH D Vehicle rear LH Component Description INFOID 0000000006256041 Component parts Reference Air levelizer control module SCS 51 Air Levelizer Control Module Vehicle height sensor SCS 51 Vehicle Height Sensor Air compressor SCS 51 Air Compressor Exhaust solenoid Revision 2010 May SCS 50 2011 QX56
96. xisted Are the inspection results normal YES gt gt 6 gt gt Repair or replace damaged part COMPRESSOR RELAY Check the air compressor relay Refer to Is the inspection result normal YES NO gt gt GO TO 7 gt gt Replace the air compressor relay T CHECK AIR COMPRESSOR Check the air compressor Refer to Is the inspection result normal YES NO gt gt GO TO 8 gt gt Replace the air compressor Refer to INTERMITTENT INCIDENT Refer to GI 40 Intermittent Incident Is the inspection result normal YES gt gt 1 SCS 79 Component Inspection Air Compressor Relay SCS 79 Component Inspection Air Compressor SCS 95 Removal and Installation Perform STANDARD VEHICLE HEIGHT SETTING Refer to SCS 67 Work Procedure 2 If DTC is detected replace the air levelizer control module Refer to SCS 94 Removal and Installation Revision 2010 May SCS 78 2011 QX56 C1804 VHCL HEIGHT ADJ UP lt DTC CIRCUIT DIAGNOSIS gt AIR LEVELIZER CONTROL SYSTEM NO gt gt Repair or replace damaged part Component Inspection Air Compressor Relay inFo10 0000000006256072 1 AIR COMPRESSOR RELAY 1 Remove the air compressor relay Refer to SCS 50 Component Parts Location 2 Apply 12 V direct current between air compressor relay terminals 1 and 2 CAUTION Never make the terminals short Connect the

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