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REAR SUSPENSION

1. 46 Removal and Installation 41 REMOVAL reet 46 REMOVAL 41 46 INSTALLATION rinm 41 Initialization Procedure 46 INSPECTION 41 SERVICE DATA AND SPECIFICATIONS SDS 47 REAR LOAD LEVELING AIR SUSPENSION COM Wheel Alignment 47 PRESSOR ASSEMBLY 42 Ball Joint 47 Removal and Installation 42 Wheelarch Height Unladen 48 REMOVAL 42 INSTAEEATION 43 Revision August 2007 RSU 2 2004 QX56 PRECAUTIONS PRECAUTIONS PFP 00001 Precautions for Supplemental Restraint System SRS AIR BAG and SEAT BELT PRE TENSIONER 5 The Supplemental Restraint System such as AIR 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 sev
2. oia delit 35 WORK 6 14 INSPECTION AFTER REMOVAL 35 SELF DIAGNOSIS 14 INSTALLATION tette ite 36 DATA MONITOR eene 15 FRONT LOWER LINK eene 37 TEST tenti et 16 Removal and Installation 37 TROUBLE DIAGNOSIS FOR SELF DIAGNOSTIC REMOVAL 1t 37 17 INSPECTION AFTER REMOVAL 37 Height Sensor System Inspection 17 INSTALLATION 5 ntt eterne 38 Exhaust Valve Solenoid System Inspection 19 Compressor Motor Compressor Motor Relay and Revision August 2007 RSU 1 2004 QX56 REAR LOWER LINK amp COIL SPRING 39 HEIGHT SENSOR 44 Removal and Installation 39 Removal and Installation 44 REMOVAL t mei Fue exei rend 39 REMOVAL ec P DEREN 44 INSPECTION AFTER REMOVAL 40 45 INSTALLATION lett 40 CONTROL UNIT 2 2 2 46 STABILIZER BAR 2 41 Removal and Installation
3. x x x x bunoouse qno4 HAN LM 5880 x x 154 18940 001000599101 HAN 5 Xv Deun Duijooussiqnoi HAN XW NOISN3dSf1S LNOYS ANY 3 TXV LNOHJ x x x x x x Hey bunoouse gnoJ HAN 5 04 TVILN3H3HHIO Heyg dd LAVHS HdTl3dOHd x 5 5 Zo NSd jeeuM 129 50 6 sseuesoo uoisuedsng x x Buuds x x x x x x x x uogejouejep 10 x x x x x x vensu uogeuuojep aquosqe 02046 x x x x x x 62 5 sseuesoo uogejeisurjedoudu x x x x x x uc N e X 8 5 2 g t 2 E 2 o 2 5 2 gt gt 5 o g 3 8 2 o E 9 E ra x Applicable 2004 QX56 RSU 5 Revision August 2007 CAN COMMUNICATION CAN COMMUNICATION 23710 System Description EESo012 Refer to LAN 5 CAN COMMUNICATION Revision August 2007 RSU 6 2004 QX56 TROUBLE DIAGNOSIS TROUBLE DIAGNOSIS PFP 00000 How to Perform Trouble Diagnoses for Quick and Accurate Repair INTRODUCTION The rear load leveling air suspension system uses an electronic con trol unit to control major functions The control unit accepts i
4. Ball stud is worn Joint is hard to swing Play in axial direction is excessive A 25 Swinging force Refer to RSU 47 Ball Joint Turning force Refer to RSU 47 Ball Joint Vertical end play Refer to RSU 47 Ball Joint NOTE SFA858A Measurement point A is at the bolt groove of the ball stud INSTALLATION Installation is in the reverse order of removal Tighten the nuts and bolts to specification Refer to RSU 25 Components Perform the final tightening of the nuts and bolts for the links rubber bushings under unladen condition with the tires on level ground Check the wheel alignment Refer to RSU 27 Wheel Alignment Inspection Revision August 2007 RSU 36 2004 QX56 LOWER LINK FRONT LOWER LINK 55110 Removal and Installation er REMOVAL 1 Remove the wheel and tire assembly using power tool 2 Use CONSULT II EXHAUST SOLENOID active test to release the air pressure from the rear load level ing air suspension system 3 Remove the shock absorber lower end bolt 4 Remove the adjusting bolt and nut and the bolt and nut from E the front lower link and rear suspension member using power tool Shock absorber _ upper end bolt absorber lower end bolt LEIA0082E 5 Remove the front lower link pinch bolt and nut on the knuckle side using power tool 6 Disconnect the front lower link from the knuckle using a soft
5. Is code C1804 or C1808 displayed again YES gt gt GOTO3 NO gt gt Inspection End 3 CONNECTOR INSPECTION 1 Turn ignition switch OFF 2 Disconnect suspension control unit connector B3 and suspension air compressor C9 3 Check the terminals for deformation disconnection looseness or damage OK or NG OK gt gt If code C1804 or C1808 was retrieved during self diagnosis GO TO 4 If code C1802 was retrieved during self diagnosis GO TO 6 NG gt gt Repair or replace as necessary 4 AIR HOSE INSPECTION Inspect for pinched or damaged air hoses between the suspension air reservoir and each load leveling rear air suspension shock absorber OK or NG OK gt gt GOTO 5 NG gt gt Repair or replace as necessary 5 SUSPENSION AIR COMPRESSOR INSPECTION Apply 12V to suspension air compressor C9 terminal 2 and body ground to suspension air compressor C9 terminal 1 System air pressure should vent OK or NG OK gt gt GO TO 6 NG gt gt Replace the suspension air compressor Refer to RSU 42 REAR LOAD LEVELING AIR SUSPENSION COM PRESSOR ASSEMBLY DISCONNECT 52 Suspension air compressor connector WEIAO066E Revision August 2007 RSU 21 2004 QX56 TROUBLE DIAGNOSIS FOR SELF DIAGNOSTIC ITEMS 6 CHECK SUSPENSION AIR COMPRESSOR POWER AND GROUND 1 Turn the ignition switch ON 2 Check voltage between suspension air compressor connector C9 terminal 2 SB and ground 46
6. SFA614B Revision August 2007 RSU 28 2004 QX56 REAR SUSPENSION ASSEMBLY 5 Push the vehicle slowly ahead to rotate the wheels 180 Lines parallel to degrees a half turn center line of body If the wheels are rotated more than 180 degrees a half turn then repeat the above steps Never push the vehicle backward 6 Measure the distance B front side across from tire to tire Total toe in Refer to RSU 47 Wheel Alignment 7 Ifthe toe in is outside the specified value adjust the toe in using the adjusting bolt in the rear lower link pe Adjusting bolt CAUTION 2 Be sure to adjust equally on RH and LH sides using the eir adjusting bolt COURTS pe Toe changes about 1 5 mm 0 059 in one side with each grad uation of the adjusting bolt 8 Tighten the adjusting bolt nuts to specification Rear lower link LEIAO009E Revision August 2007 RSU 29 2004 QX56 REAR SUSPENSION MEMBER REAR SUSPENSION MEMBER 55501 Removal and Installation Rear Suspension SEC 431 432 2 Front 0 200 20 148 22 2 2 16 222 E 8 3 0 85 73 o Gs 07225 23 166 175 18 129 NE 95 9 7 70 lt 7 e 34 3 5 25 4 175 18 129 N m kg m in Ib o kg m ft lb WEIA0092E Revision August 2007 RSU 30 2004 QX56 REAR SUSPENSION MEMBER 1 Seat belt latch anchor 2 Stabilizer bar bushing 3 Sta
7. Suspension air compressor connnector Voltage Approx 12V 0090 3 Turn ignition switch OFF 4 Check resistance between suspension air compressor connec tor C9 terminal 1 B and ground Continuity should exist T S C Suspension air compressor connector OK gt gt Replace the suspension control unit Refer to RSU 46 CONTROL UNIT NG Repair the circuit OK or NG WEIAO0091E Revision August 2007 RSU 22 2004 QX56 TROUBLE DIAGNOSES FOR SYMPTOMS TROUBLE DIAGNOSES FOR SYMPTOMS 99999 Load Leveling Rear Air Suspension System Does Not Operate 1 CHECK WARNING LAMP ACTIVATION Make sure warning lamp remains off while driving OK or NG OK GO TO 2 NG Carry out self diagnosis Refer to RSU 14 SELF DIAGNOSIS 2 CHECK FUSES e Check that the following fuses are not blown Unit Terminals Signal name Fuse or Fusible Link 6 Ignition switch ON or START 12 10A Suspension control unit 7 29 10A Battery power Compressor motor relay 5 g 30A 2221 24 Ignition switch ON or START 14 10A Combination meter 8 Battery power 19 10A OK or NG OK gt gt GO 3 NG gt gt If fuse is blown be sure to eliminate cause of blown fuse before installing new fuse Refer to PG 4 POWER SUPPLY ROUTING CIRCUIT d CHECK SUSPENSION CONTROL UNIT POWER AND GROUND 1 Turn the igniti
8. REAR LOWER LINK amp COIL SPRING REAR LOWER LINK amp COIL SPRING 551 0 Removal and Installation REMOVAL 1 Remove the wheel and tire assembly using power tool Refer to WT 6 Rotation 2 Use CONSULT II EXHAUST SOLENOID active test to release the air pressure from the rear load level ing air suspension system 3 Forremoving the LH rear lower link and coil spring remove the height sensor arm bracket bolt from the LH rear lower link arm bracket bolt LEIAO080E 4 Seta suitable jack to relieve the coil spring tension from the rear lower link WARNING Do not compress the coil spring when setting the jack Rear lower link LEIA0077E 5 Loosen the rear lower link adjusting bolt and nut connected to the rear suspension member using power tool E Rear lower link LEIAO009E 6 Remove the rear lower link bolt and nut from the knuckle using power tool Rear lower link LEIA0077E 7 Slowly lower the suitable jack to release the coil spring tension Then remove the upper rubber seat coil spring and lower rubber seat from the rear lower link Revision August 2007 RSU 39 2004 QX56 REAR LOWER LINK COIL SPRING 8 Remove the rear lower link adjusting bolt and nut from the rear suspension member using power tool then remove the rear 2 Adjusting bolt lower link A Ec Rear lower link LEIAO009E INSPECTION AFTER REMOVAL Check the coil spring and rubber seats
9. W L Y B V 2 COMPRESSOR MOTOR CO 3 RELAY E130 2131 BAT COMPRESSOR EXHAUST SUSPENSION RELAY VALVE CONTROL OUTPUT OUTPUT UNIT SUSPENSION EXHAUST AIR VALVE COMPRESSOR SOLENOID a Co 37C E41 B e B B B B B B JA B19 E15 REFER TO THE FOLLOWING C1 SUPER MULTIPLE pene es ett JUNCTION SMJ napajal kalsojeopalso w WEWA0024E Revision August 2007 RSU 10 2004 QX56 TROUBLE DIAGNOSIS RSU A SUSP 02 IGNITION SWITCH FUSE BLOCK REFER TO PG POWER J B HEIGHT SENSOR 521 Y R O L WITH REAR VIEW MONITOR WITHOUT REAR VIEW MONITOR 2 13 64 SUSPENSION COMBINATION HEIGHT OUTPUT SENSOR METER GND s M24 WARNING ALTERNATOR LAMP INPUT OUTPUT 15 Lo BR W G W BR B ORo f DI R VIEW Le em 1 62 2 BR W GW BR 34G BR W E40 Z DATA BRW LINK CONNECTOR M22 GENERATOR 44 st REFER TO THE FOLLOWING M31 SUPER MULTIPLE JUNCTION SMJ repre p pe po 118280148 6 hofsolsopojeo w x A 2 GR GR 9 1112113 1415116 w WEWA0042E Revision August 2007 RSU 11 2004 QX56 TROUBLE DIAGNOSIS Basic Inspection cES00116 AIR HOSES 1 Check for pinched or damaged air hoses between the suspension air reservoir and each load level
10. CAUTION If CONSULT II is used with no connection of CONSULT II CONVERTER malfunctions might detected in self diagnosis depending on control unit which carries out CAN communication 2 Touch START NISSAN BASED VHCL AIR LEVELIZER DATA MONITOR in order on the CON SULT II screen If AIR LEVELIZER is not indicated go to GI 39 CONSULT II Data Link Connector DLC Circuit CAUTION When START NISSAN BASED VHCL is touched immediately after starting the engine or turning on the ignition switch AIR LEVELIZER might not be displayed in the SELECT SYSTEM screen In this case repeat the operation from step 2 3 Return to the SELECT MONITOR ITEM screen and touch ALL SIGNALS or SELECTION FROM MENU Refer to the following information 4 When START is touched the data monitor screen is displayed Revision August 2007 RSU 15 2004 QX56 TROUBLE DIAGNOSIS Display Item List Data monitor item selection Test Item ALL SELECTION SIGNALS FROM MENU HEIGT SEN X HEIGT CALC SEN FIX TIME HEIGT INI VAL COMPRESSOR EXH SOLENOID ACGL X X x X Applicable Not applicable ACTIVE TEST CAUTION Do not perform active test while driving Operation Procedure 1 Connect the CONSULT Il and CONSULT II CONVERTER to the data link connector and start the engine CAUTION If CONSULT II is used w
11. Hr mud ee 1 Fuel engine coolant and engine oil full Spare tire jack hand tools and mats in designated positions 2 Verify the vehicle height using Consult Il memory register 1103 and set rear wheelarch height to 0 10 mm 0 0 39 in as neces sary Revision August 2007 RSU 48 2004 QX56
12. QX56 TROUBLE DIAGNOSIS WORK FLOW Inspection start Verify customer s concern Review INTRODUCTION in How to Perform Trouble Diagnosis for Quick and Accurate Repair Perform Basic Inspection Does the CK SUSP indicator lamp light NO Does AIR LEVELIZER appear on CONSULT II display Perform self diagnostic procedures Perform diagnostic procedure for symptom Check or repair malfunctioning part NG Check or repair malfunctioning part C Perform self diagnostic procedures again Confirm symptom OK Erase self diagnostic results Inspection end WEIA0077E Revision August 2007 RSU 8 2004 QX56 TROUBLE DIAGNOSIS Component Parts and Harness Connector Location Fuse and fusible link box Height sensor Fuse block J B js Suspension air compressor Generator Combination meter and compressor motor relay Suspension control unit Fuse block J B fuse layout Fuse and fusible link box Fa Herm B3 113 24 31 FUSE f m FUSIBLE LINK 5 Suspension control unit Combination meter air compressor and compressor Q Height sensor motor relay View from under vehicle Frot G WEIA0140E Revision August 2007 RSU 9 2004 QX56 TROUBLE DIAGNOSIS Wiring Diagram A SUSP FUSE Pon BLOCK 36k REFER TO PG POWER e 9
13. should exist Height sensor Suspension control connector unit connector do HH 0086 2 Disconnect suspension control unit connector 3 Check resistance between height sensor connector C8 terminal 2 W and ground 4d 9 Height sensor Continuity should not exist OK or NG connector OK gt gt Replace the height sensor Refer to RSU 44 HEIGHT SENSOR NG Repair the circuit WEIA0087E Revision August 2007 RSU 18 2004 QX56 TROUBLE DIAGNOSIS FOR SELF DIAGNOSTIC ITEMS Exhaust Valve Solenoid System Inspection INSPECTION PROCEDURE 1 SELF DIAGNOSIS RESULT CHECK Check self diagnosis results Self diagnosis results C1803 C1805 Is the above displayed in the self diagnosis display items YES gt gt If code C1803 was retrieved during self diagnosis GO TO If code C1805 was retrieved during self diagnosis GO TO 2 NO gt gt Inspection End 2 CHECK SYSTEM OPERATION 1 Load vehicle to standard laden condition with driver front passenger 2 passengers in second row seats and no cargo 2 Conduct active test of COMPRESSOR to raise vehicle ride height to 20mm CAUTION The COMPRESSOR active test will remain ON until it is turned off using CONSULT II Allowing the compressor to run for an extended period of time may cause damage to air suspension sys tem components due to excessive pressure in the air suspension system 3 Return the rear lo
14. 06 C1807 Is the above displayed in the self diagnosis display items YES gt gt GOTOS3 NO gt gt GO TO 2 2 DATA MONITOR CHECK Conduct data monitor of HEIGT SEN to check if the status is normal HEIGT SEN 0 2V 4 8V OK or NG OK gt gt Inspection End NG gt gt GO TO 3 3 CONNECTOR INSPECTION 1 Turn ignition switch OFF 2 Disconnect suspension control unit connector B3 and height sensor C8 3 Check the terminals for deformation disconnection looseness or damage OK or NG OK gt gt GO TO 4 NG gt gt Repair or replace as necessary Revision August 2007 RSU 17 2004 QX56 TROUBLE DIAGNOSIS FOR SELF DIAGNOSTIC ITEMS 4 CHECK HEIGHT SENSOR POWER AND GROUND 1 Reconnect the suspension control unit connector 2 Turn the ignition switch ON 3 Check voltage between height sensor connector C8 terminal 1 R and ground Voltage Approx 5V Height sensor connector 1 WEIA0084E 4 Turn ignition switch OFF 5 Check resistance between height sensor connector C8 terminal 3 L and ground gt DISCONNECT Continuity should exist A CUR Height sensor connector OK or NG OK gt gt GO TO 5 gt gt Repair the circuit WEIA0085E 5 CHECK HEIGHT SENSOR SIGNAL CIRCUIT 1 Check resistance between height sensor connector C8 terminal 2 W and suspension control unit connector B3 terminal 3 W DISCONNECT Ty A 4A 9 f Continuity
15. E SUSPENSION aa PRO UJ REAR SUSPENSION CONTENTS PRECAUTIONS erinnere 3 Circuit Inspection 20 Precautions for Supplemental Restraint System TROUBLE DIAGNOSES FOR SYMPTOMS 23 SRS AIR BAG and SEAT BELT PRE TEN Load Leveling Rear Air Suspension System Does SIONER ette etie temario 3 Not Operate one iad 23 Precautions for Rear Suspension 3 CK SUSP Indicator Lamp Stays On When Ignition Wiring Diagrams and Trouble Diagnosis 3 Switch Is Turned On 24 PREPARATION crebri rennen enne 4 REAR SUSPENSION ASSEMBLY 25 Commercial Service Tools 4 Combporiehts b qe dee Ene fedet 25 NOISE VIBRATION AND HARSHNESS NVH On Vehicle Inspection and Service 26 TROUBLESHOOTING 5 SHOCK ABSORBER INSPECTION 26 NVH Troubleshooting Chart 5 Wheel Alignment Inspection 27 CAN COMMUNICATION eene 6 PRELIMINARY INSPECTION 27 System Description 2 6 GENERAL INFORMATION AND RECOMMEN TROUBLE DIAGNOSIS eene 7 DATION S edis 27 How to Perform Trouble Diagnoses for Quick a
16. HEIGHT INI work support function to set initialization condition 4 Confirm that CK SUSP warning lamp is OFF Revision August 2007 RSU 46 2004 QX56 SERVICE DATA AND SPECIFICATIONS 505 SERVICE DATA AND SPECIFICATIONS SDS Wheel Alignment Camber Degree minute decimal degree PFP 00030 80011 0 0 0 Nominal 0 30 0 5 Maximum 1 0 1 0 Cross camber 0 45 0 75 Lines parallel to center line of body SFA234AC Toe in Ball Joint Minimum 0 mm 0 in Nominal 3 3 mm 0 130 in Distance A B 6 6 mm 0 260 in Cross toe 2 mm 0 079 in Minimum 0 0 0 Angle left and right Nominal 0 7 0 11 Degree minute decimal degree Maximum 0 14 0 220 Cross toe 0 8 0 14 A 25 8 SFA858A 50011 Swinging force measurement point is at the bolt groove of the ball stud 11 4 145 5 N 1 16 14 8 kg 2 56 32 7 Ib Turning torque B 0 5 6 4 0 06 0 65 kg m 5 56 in Ib Vertical end play Revision August 2007 RSU 47 0 mm 0 in 2004 QX56 SERVICE DATA AND SPECIFICATIONS SDS Wheelarch Height Unladen Unit mm in Front Hf 2 LEIAO085E Suspension type Air leveling Applied model 4x2 4x4 Front wheelarch height Hf ns 5 pun Rear wheelarch height
17. SU 34 2004 QX56 SUSPENSION ARM SUSPENSION ARM PFP 55501 Removal and Installation EESOOTIL REMOVAL 1 Remove the rear suspension member assembly using power tool Refer to RSU 30 Removal and Instal lation NOTE It is necessary to remove the rear suspension member to remove the front upper bolt from the suspension arm 2 Remove the shock absorber upper end bolt 3 Remove the suspension arm upper nuts and bolts on the sus pension member side using power tool 221 absorber sy _ Upper end bolt absorber lower end bolt LEIA0082E 4 Remove the suspension arm pinch bolt and nut on the knuckle ____ Suspension side using power tool pinch d 3 5 Disconnect the suspension arm from the knuckle using a soft bolt and nut 1 10 hammer Um Ree CAUTION 2u 2 3 zx Do not damage the ball joint with the soft hammer iif 6 Remove the suspension 27 el INSPECTION AFTER REMOVAL e Checkthe suspension arm for damage cracks deformation and replace if necessary e Checkthe rubber bushing for damage cracks and deformation Replace suspension arm assembly if nec essary e Before checking turn the ball joint at least 10 revolutions so that the ball joint is properly broken in LEIA0087E Revision August 2007 RSU 35 2004 QX56 SUSPENSION ARM Check the ball joint Replace the suspension arm assembly if any of the following conditions exist
18. SUSPENSION ASSEMBLY PFP 55020 Components Rear Suspension SEC 431 432 0 200 20 148 8 3 0 85 73 07225 23 166 A 0 175 18 129 175 18 129 m 95 9 7 70 lt 7 Pd e 34 3 5 25 of G 175 18 129 N m kg m in Ib o N m kg m ft lb WEIA0092E Revision August 2007 RSU 25 2004 QX56 REAR SUSPENSION ASSEMBLY 1 Seat belt latch anchor 2 Stabilizer bar bushing 3 Stabilizer bar clamp 4 Stabilizer bar 5 Connecting rod 6 Front lower link 7 8 Bushing 9 Rear lower link 10 Shock absorber 11 Suspension arm 12 Lower rubber seat 13 Coil spring 14 Upper rubber seat 15 Rear suspension member 16 Spare tire bracket 17 Bound bumper Rear Load Leveling Air Suspension System SEC 432 175 18 129 N m kg m in b N m kg m ft Ib LEIA0072E 1 Rear load leveling air suspension 2 Shock absorber RH 3 Height sensor hose RH 4 Rear load leveling air suspension 5 Shock absorber LH 6 Rear load leveling air suspension hose LH compressor assembly On Vehicle Inspection and Service Check all of the component mountings for any excessive looseness or back lash Check the components for any excessive wear damage or abnormal conditions Repair or replace the components as necessary SHOCK ABSORBER INSPECTION e Check the shock absorbers for any air leaks or damage and replace as neces
19. ad leveling air suspension system to normal operating mode 4 Check self diagnostic results Is code C1805 displayed again YES gt gt NO gt gt Inspection End 3 CONNECTOR INSPECTION 1 Turn ignition switch OFF 2 Disconnect suspension control unit connector B3 and suspension air compressor C9 3 Check the terminals for deformation disconnection looseness or damage OK or NG OK gt gt If code C1805 was retrieved during self diagnosis GO TO 4 If code C1803 was retrieved during self diagnosis GO TO 6 NG gt gt Repair or replace as necessary 4 AIR HOSE INSPECTION Inspect for pinched or damaged air hoses between the suspension air reservoir and each load leveling rear air suspension shock absorber OK or NG OK gt gt GOTO 5 NG gt gt Repair or replace as necessary Revision August 2007 RSU 19 2004 QX56 TROUBLE DIAGNOSIS FOR SELF DIAGNOSTIC ITEMS 5 EXHAUST VALVE SOLENOID INSPECTION Apply 12V to suspension air compressor C9 terminal 2 and body ground to suspension air compressor C9 terminal 1 System air pressure should vent OK or NG OK gt gt GO TO 6 NG Replace the suspension air compressor Refer to RSU 42 REAR LOAD LEVELING AIR SUSPENSION COM PRESSOR ASSEMBLY DISCONNECT 23 Suspension air compressor connector WEIA0063E 6 CHECK EXHAUST VALVE SOLENOID POWER AND GROUND 1 Reconnect the suspension control unit connector 2 Turn the igniti
20. amage Check the vehicle height Refer to RSU 48 Wheelarch Height Unladen e Verify the vehicle height using Consult Il memory register 1103 and set to 0 10 mm 0 0 39 in as necessary GENERAL INFORMATION AND RECOMMENDATIONS 1 A Four Wheel Thrust Alignment should be performed e This type of alignment is recommended for any NISSAN vehicle e The four wheel thrust process helps ensure that the vehicle is properly aligned and the steering wheel is centered e alignment machine itself should be capable of accepting any NISSAN vehicle e The alignment machine should be checked to ensure that it is level 2 Make sure the alignment machine is properly calibrated e Your alignment machine should be regularly calibrated in order to give correct information o Revision August 2007 RSU 27 2004 QX56 REAR SUSPENSION ASSEMBLY e Check with the manufacturer of your specific alignment machine for their recommended Service Cali bration Schedule THE ALIGNMENT PROCESS IMPORTANT Use only the alignment specifications listed in this Service Manual Refer to RSU 47 Wheel Alignment 1 When displaying the alignment settings many alignment machines use indicators Green red plus or minus Go No Go Do NOT use these indicators e The alignment specifications programmed into your alignment machine that operate these indicators may not be correct e This may result in an ERROR 2 Some newer alignme
21. appropriate inspection from the display item list and repair or replace the malfunctioning component 7 Start and run the vehicle for approximately 1 minute Turn ignition switch OFF to prepare for erasing the memory 9 Start the engine and touch START NISSAN BASED VHCL AIR LEVELIZER SELF DIAG RESULTS ERASE in order on the CONSULT II screen to erase the error memory If AIR LEVELIZER is not indicated go to GI 39 CONSULT II Data Link Connector DLC Circuit 0 Revision August 2007 RSU 14 2004 QX56 CAUTION TROUBLE DIAGNOSIS If the error memory is not erased re conduct the operation from step 7 10 For the final inspection start and run the vehicle for approximately 1 minute and confirm that the CK SUSP indicator lamp is off Display Item List Self diagnostic item Malfunction detecting condition Check system Vehicle height sensor C1801 Vehicle height sensor voltage is less than 0 2V or greater than 4 8V for more than 60 seconds Refer to RSU 17 Height Sensor System Inspection Compressor relay C1802 1 Driving transistor for compressor relay is off and monitor volt age continues high level for more than 10 seconds 2 Driving transistor for compressor relay is on and monitor volt age continues low level for more than 5 seconds Refer to RSU 20 Compres sor Motor Compressor Motor Relay and Circuit Inspection Exhaust solenoid C1803 1 Driving t
22. ar suspension member suspension arm front and rear lower links and stabilizer bar as belt an assembly lati Front 20 If necessary remove the suspension arm spare tire bracket anchor height sensor rear load leveling air suspension hoses stabilizer bar knuckle and front and rear lower links from the rear suspension member INSPECTION AFTER REMOVAL Check the rear suspension member for deformation cracks and other damage and replace if necessary Revision August 2007 RSU 32 2004 QX56 REAR SUSPENSION MEMBER INSTALLATION Installation is in the reverse order of removal e When raising the rear suspension member assembly use the locating pins to align the rear suspension member to the vehicle body M Rear suspension member locating pin LEIA0083E e When installing the upper and lower rubber seats for the rear coil springs the arrow embossed on the rubber seats must point out toward the wheel and tire assembly ee Arrow Rubber seat LEIAQO76E e Toconnect the rear load leveling air suspension hoses the lock ring must be fully seated in the fitting Insert the hose B into the lock ring until the lock ring is touching the hose as shown Pull on the hose to check that it is securely inserted H Lock ring 9 T Touch A to B LEIA0078E e Perform the final tightening of the nuts and bolts for the links rubber bushing under unladen condition with t
23. ber bushings for deterioration or cracks and replace if necessary Revision August 2007 RSU 41 2004 QX56 REAR LOAD LEVELING AIR SUSPENSION COMPRESSOR ASSEMBLY REAR LOAD LEVELING AIR SUSPENSION COMPRESSOR ASSEMBLY pPFP 53400 Removal and Installation EESQoHT Rear Load Leveling Air Suspension System SEC 432 ZU 127 1 3 9 S9 7 5 175 18 129 N m kg m in Ib N m kg m ft ib LEIA0072E 1 Rear load leveling air suspension 2 Shock absorber RH 3 Height sensor hose RH 4 Rear load leveling air suspension 5 Shock absorber LH 6 Rear load leveling air suspension hose LH compressor assembly REMOVAL 1 Use CONSULT II EXHAUST SOLENOID active test to release the air pressure from the rear load level ing air suspension system 2 Disconnect the electrical connectors for the rear load leveling air suspension compressor assembly Unclip the rubber cover to access the rear load leveling air suspension compressor assembly 4 Disconnect the rear load leveling air suspension hoses at the rear load leveling air suspension compressor assembly e To disconnect the hoses push in on the lock ring using a suit able tool and pull the hose out Air hoses lt Rear load TS leveling air suspension compressor assembly LEIA0074E Revision August 2007 RSU 42 2004 QX56 REAR LOAD LEVELING AIR SUSPENSION COMPRESSOR ASSEMBLY 5 Remove the four bolts that mount the rear load le
24. bilizer bar clamp 4 Stabilizer bar 5 Connecting rod 6 Front lower link 7 Knuckle 8 Bushing 9 Rear lower link 10 Shock absorber 11 Suspension arm 12 Lower rubber seat 13 Coil spring 14 Upper rubber seat 15 Rear suspension member 16 Spare tire bracket 17 Bound bumper Rear Load Leveling Air Suspension System SEC 432 ZU 127 1 3 9 S9 2 o 175 18 129 N m kg m in Ib N m kg m ft ib LEIA0072E 1 Rear load leveling air suspension 2 Shock absorber RH 3 Height sensor hose RH 4 Rear load leveling air suspension 5 Shock absorber LH 6 Rear load leveling air suspension hose LH compressor assembly includes the bracket and rubber cover REMOVAL 1 Use the CONSULT II EXHAUST SOLENOID active test to release the air pressure from the rear load leveling air suspension system 2 Disconnect the electrical connectors for the height sensor and the rear load leveling air suspension com pressor assembly 3 Unclip the rubber cover to access the rear load leveling air suspension compressor assembly Revision August 2007 RSU 31 2004 QX56 REAR SUSPENSION MEMBER 4 Disconnect the rear load leveling air suspension hoses at the rear load leveling air suspension compressor assembly e disconnect the hoses push in on the lock ring using a suit able tool and pull the hose out 5 Remove both of the rear wheel and tire assemblies using power Air hoses lt Rear
25. erity of a collision and whether the front occupants are belted or unbelted Information necessary to service the system safely is included in the SRS and SB section of this Service Man ual WARNING e avoid rendering the SRS inoperative which could increase the risk of personal injury or death in the event of a collision which would result in air bag inflation all maintenance must be per formed by an authorized NISSAN INFINITI dealer e maintenance including incorrect removal and installation of the SRS can lead to per sonal injury caused by unintentional activation of the system For removal of Spiral Cable and Air Bag Module see the SRS section e 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 harness connectors Precautions for Rear Suspension EESD010Y e When installing the rubber bushings the final tightening must be done under unladen condition and with the tires on level ground Oil will shorten the life of the rubber bushings so wipe off any spilled oil immedi ately e Unladen condition means the fuel tank engine coolant and lubricants are at the full specification The spare tire jack hand tools and mats are in their designated positions e After installing suspension components check the wheel alignment e Caulking nuts not reusable Alway
26. for deformation cracks or other damage and replace if necessary INSTALLATION Installation is in the reverse order of removal e Tighten the nuts and bolts to specification Refer to RSU 25 Components e When installing the upper and lower rubber seats for the rear coil springs the arrow embossed on the rubber seats must point out toward the wheel and tire assembly e After installing the rear lower link and coil spring check the wheel alignment and adjust if necessary Refer to RSU 27 Wheel Alignment Inspection LEIA0076E Revision August 2007 RSU 40 2004 QX56 STABILIZER BAR STABILIZER BAR PFP 56230 Removal and Installation EES0011R REMOVAL 1 Disconnect the stabilizer bar ends from the connecting rods using power tool Stabilizer Connecting rod 2 Remove the stabilizer bar clamps using power tool and remove the stabilizer bar bushings aa 3 Remove the stabilizer bar bar clamp LEIAO089E INSTALLATION Installation is in the reverse order of removal e lighten the nuts and bolts to specification Refer to RSU 25 Components e Install the stabilizer bar with the ball joint sockets properly aligned e Install the stabilizer bar bushing and clamp so they are posi tioned inside of the sideslip prevention clamp on the stabilizer bar SFA449BB Inspection cEsoor1s e Check stabilizer bar for any deformation cracks or damage and replace if necessary e Check rub
27. h END Display Item List Item Description STANDARD HEIGHT LEVEL This mode allows the vehicle height to be set to vehicle height specification within tolerance ADJUST HEIGHT INI The initialization value and flag can be set in the suspension control unit in this mode CLEAR HEIGHT INI This mode clears the initialization flag and value in the suspension control unit SELF DIAGNOSIS Description If an error is detected in the system perform self diagnosis as follows Operation Procedure 1 Turn ignition switch OFF 2 Connect CONSULT II and CONSULT II CONVERTER to the data link connector CAUTION If CONSULT II is used with no connection of CONSULT II CONVERTER malfunctions might be detected in self diagnosis depending on control unit which carries out CAN communication 3 Turn ignition switch ON 4 After stopping the vehicle with the engine running touch START NISSAN BASED VHCL AIR LEVEL IZER SELF DIAG RESULTS in order on the CONSULT II screen CAUTION If START NISSAN BASED VHCL is touched immediately after starting the engine or turning on the ignition switch AIR LEVELIZER might not be displayed in the SELECT SYSTEM screen In this case repeat the operation from step 1 5 The self diagnostic results are displayed If necessary the self diagnostic results can be printed out by touching COPY e When NO DTC IS DETECTED is displayed check the CK SUSP indicator lamp 6 Conduct the
28. hammer CAUTION f Do not damage the Dan joint with the soft hammer eee 7 Remove the front lower link Front lower link pinch nut and bolt LEIAO086E INSPECTION AFTER REMOVAL e Check the front lower link and bushing for any deformation crack or damage Replace if necessary e Check the rubber bushing for damage cracks and deformation Replace the front lower link and bushing if necessary Before checking turn the ball joint at least 10 revolutions so that the ball joint is properly broken in e Check the ball joint Replace the front lower link if any of the fol lowing conditions exist Ball stud is worn Joint is hard to swing Play in axial direction is excessive A es Swinging force A Refer to RSU 47 Ball Joint Turning force B Refer to RSU 47 Ball Joint Vertical end play Refer to RSU 47 Ball Joint Revision August 2007 RSU 37 2004 QX56 SFA858A FRONT LOWER LINK NOTE Measurement point is at the bolt groove of the ball stud INSTALLATION Installation is in the reverse order of removal e Tighten the nuts and bolts to specification Refer to RSU 25 Components e Perform the final tightening of the front lower link nuts and bolts with rubber bushings under unladen condition with tires on level ground e Checkthe wheel alignment Refer to RSU 27 Wheel Alignment Inspection Revision August 2007 RSU 38 2004 QX56
29. he tires on level ground e Check the wheel alignment Refer to RSU 47 Wheel Alignment Revision August 2007 RSU 33 2004 QX56 SHOCK ABSORBER SHOCK ABSORBER PFP 56210 Removal and Installation REMOVAL 1 Remove the wheel and tire assembly using power tool Refer to WT 6 Rotation 2 Use CONSULT II EXHAUST SOLENOID active test to release the air pressure from the rear load level ing air suspension system 3 Remove the four clips and remove the rear fender protector front 4 Disconnect the rear load leveling air suspension hose from the shock absorber e To disconnect the hose push in on the lock ring using a suit able tool and pull the air hose out LEIA0081E 5 Remove the shock absorber upper and lower end bolts using power tool 6 Remove the shock absorber CAUTION Do not damage the rubber boot on the shock absorber absorber _ upper end bolt X Rm am ien LAUD KU Shock 80 absorber lower end bolt LEIA0082E INSTALLATION Installation is in the reverse order of removal e Tighten the shock absorber bolts to specification Refer to RSU 25 Components INSPECTION AFTER INSTALLATION e Check the shock absorber for any air leaks or damage to the rubber boot e Check the shock absorber for smooth operation through a full stroke both compression and extension e Check piston rod for cracks deformation or other damage and replace if necessary Revision August 2007 R
30. ing rear air suspension shock absorber Reposition repair or replace hoses as necessary 2 Check the air hose connections at the suspension air reservoir and at the shock absorbers for leaks If connections are leaking repair or replace hoses as necessary POWER SYSTEM TERMINAL LOOSENESS AND BATTERY INSPECTION Make sure the battery positive cable negative cable and ground connection are not loose In addition make sure the battery is sufficiently charged CK SUSP INDICATOR LAMP INSPECTION 1 Make sure the CK SUSP indicator lamp turns on for approximately 2 seconds when the ignition switch is turned ON If it does not check the combination meter Refer to 01 5 COMBINATION METERS 2 Make sure the lamp turns off approximately 2 seconds after the ignition switch is turned ON If the lamp does not turn off conduct self diagnosis of the suspension control unit 3 After conducting the self diagnosis be sure to erase the error memory Refer to RSU 13 CONSULT II Function AIR LEVELIZER CK SUSP Indicator Lamp Timing EES00117 Condition PE USP Remarks indicator lamp Ignition switch OFF Ignition switch ON X Turns off after approximately 2 seconds X ON OFF Control Unit Input Output Signal Standard NEN Item Condition Voltage V F Approx 1 Compressor relay output Battery voltage 3 W Height sensor signal inpu
31. ith no connection of CONSULT II CONVERTER malfunctions might be detected in self diagnosis depending on control unit which carries out CAN communication 2 Touch START NISSAN BASED VHCL on the display screen 3 Touch AIR LEVELIZER If AIR LEVELIZER is not indicated go to GI 39 CONSULT II Data Link Connector DLC Circuit 4 Touch ACTIVE TEST 5 The SELECT TEST ITEM screen is displayed 6 Touch necessary test item 7 With the MAIN SIGNALS display highlighted touch START 8 The active test screen will be displayed Display Item List Test Item Description COMPRESSOR OFF ON EXHAUST SOLENOID OFF ON WARNING LAMP OFF ON CAUTION The COMPRESSOR active test will remain ON until it is turned off using CONSULT II Allowing the compressor to run for an extended period of time may cause damage to air suspension system com ponents due to excessive pressure in the air suspension system NOTE TEST IS STOPPED is displayed approximately 10 seconds after operation starts for all active test items except COMPRESSOR After TEST IS STOPPED is displayed to perform test again repeat Step 6 Revision August 2007 RSU 16 2004 QX56 TROUBLE DIAGNOSIS FOR SELF DIAGNOSTIC ITEMS TROUBLE DIAGNOSIS FOR SELF DIAGNOSTIC ITEMS 00000 Height Sensor System Inspection EESOOTTA INSPECTION PROCEDURE 1 SELF DIAGNOSIS RESULT CHECK Check self diagnosis results Self diagnosis results C1801 C18
32. load tool N leveling air 6 Remove the brake caliper without disconnecting the brake XN Suspension hoses using power tool Reposition the brake caliper out of the 1 way using a suitable wire Refer to BR 28 Removal and Instal lation of Brake Caliper Assembly and Disc Rotor CAUTION LEIA0074E e Do not crimp or stretch the brake hose when repositioning the brake caliper out of the way e Do not press brake pedal while the brake caliper is removed 7 Remove the spare tire 8 Disconnect the two rear ABS sensor electrical connectors 9 Remove the two rear drive shafts Refer to RAX 7 Removal and Installation 10 Remove the rear final drive Refer to RFD 10 REAR FINAL DRIVE ASSEMBLY 11 Remove the EVAP canister bolt from the top of the rear suspension member 12 Disconnect the parking brake cables from the brackets on the rear suspension member 13 Set a suitable jack to support each of the rear lower links and the coil spring tension Rear lower link LEIA0077E 14 Remove both of the rear lower link outer bolts and lower the jack to remove the rear coil springs 15 Remove the two bolts to disconnect the seat belt latch anchor from the rear suspension member 16 Disconnect both of the connecting rods from the rear stabilizer member bar 17 Set a suitable jack under the rear suspension member 18 Remove the six rear suspension member bolts 19 Slowly lower the jack to remove the re
33. nd THE ALIGNMENT PROCESS 28 Accurate Repair 4 4422 4 220 7 GAMBER 28 INTRODUCTION 7 nel DE 28 CLARIFY CONCERN 7 REAR SUSPENSION MEMBER 30 WORK FLOW 8 Removal and Installation 30 ComponentParts and Harness Connector Location 9 eerie eerie 31 Wiring Diagram A SUSP 10 INSPECTION AFTER REMOVAL 32 Basic Inspection eee 12 INSTAEEATIQON 33 9 nette reseau cha 12 SHOCK ABSORBER 34 POWER SYSTEM TERMINAL LOOSENESS Removal and Installation 34 AND BATTERY INSPECTION 12 nune pep 34 CK SUSP INDICATOR LAMP INSPECTION 12 INSTALLATION 22 2 co hene 34 CK SUSP Indicator Lamp Timing 12 INSPECTION AFTER INSTALLATION 34 Control Unit Input Output Signal Standard 12 SUSPENSION ARM 35 CONSULT II Function AIR LEVELIZER 13 Removal and Installation 35 CONSULT II OPERATION 13 REMOVAL
34. nput sig nals from the height sensor and controls compressor and exhaust valve operation It is much more difficult to diagnose a rear load leveling air suspen sion system problem that occurs intermittently rather than continu ously Most intermittent problems are caused by poor electrical connections or faulty wiring In this case careful checking of suspi cious circuits may help prevent the replacement of good parts Before undertaking actual checks take just a few minutes to talk with a customer who approaches with an air suspension system com plaint The customer is a very good source of information on such problems especially intermittent ones Through discussion with the customer find out what symptoms are present and under what con ditions they occur Start your diagnosis by looking for basic mechanical problems first This is one of the best ways to troubleshoot concerns on an air sus pension system equipped vehicle Also check related Service Bulle tins for information SEF234G CLARIFY CONCERN e A customer s description of a vehicle concern may vary depend ing on the individual It is important to clarify the customer s con KEY POINTS cern e Ask the customer about what symptoms are present under what Vehicle mode conditions Use this information to reproduce the symptom Date Frequencies WHERE Road conditions Operating conditions Weather conditions Symptoms SBR339B Revision August 2007 RSU 7 2004
35. nt machines are equipped with an optional Rolling Compensation method to com pensate the sensors alignment targets or head units Do NOT use this Rolling Compensation method e Use the Jacking Compensation method After installing the alignment targets or head units raise the vehicle and rotate the wheels 1 2 turn both ways e See Instructions in the alignment machine you are using for more information CAMBER 1 Measure camber of both the right and left wheels with a suitable alignment gauge and adjust as necessary to specification Attachment Camber Refer to RSU 47 Wheel Alignment Alignment SRA096A 2 f outside of the specified value adjust the camber using the adjusting bolt in the front lower link CAUTION After adjusting the camber then check the toe in NOTE Camber changes about 5 minutes with each graduation of the adjusting bolt 3 Tighten the adjusting bolt nuts to specification Front lower link LEIAO041E TOE IN 1 Bounce the rear of the vehicle up and down two to three times to stabilize the vehicle height Refer to RSU 48 Wheelarch Height Unladen 2 Pushthe vehicle straight ahead about 5 m 16 ft 3 Puta mark on the base line of the tread rear side of both of the tires at the same height as the center of the hub This will be the measuring points 4 Measure the distance A rear side across from tire to tire Hub center height Base line Measuring point
36. ol unit which carries out CAN communication 1 Turn ignition switch OFF 2 Connect CONSULT II and CONSULT II CONVERTER to the data link connector 3 Turn ignition switch ON Brake pedal Data link connector 0369 4 Touch START NISSAN BASED VHCL CONSULTI ENGINE START NISSAN BASED VHCL START X BADGE VHCL SUB MODE T eee NOTE EXAMPLE SHOWN ACTUAL DISPLAY MAY oo29E 5 Touch AIR LEVELIZER on the SELECT SYSTEM screen If AIR LEVELIZER is not indicated go to GI 39 CONSULT II SELECT SYSTEM Data Link Connector DLC Circuit AIR BAG IPDM E R Page Down LIGHT COPY NOTE EXAMPLE SHOWN ACTUAL DISPLAY MAY DIFFER 0030 Revision August 2007 RSU 13 2004 QX56 TROUBLE DIAGNOSIS 6 Select the required operation from the SELECT DIAG MODE screen SELECT DIAG MODE For further information see the CONSULT II Operation Manual WORK SUPPORT SELF DIAG RESULTS CAN DIAG SUPPORT MNTR DATA MONITOR ACTIVE TEST ECU PART NUMBER Page Down BACK LIGHT COPY NOTE EXAMPLE SHOWN ACTUAL DISPLAY MAY DIFFER A0031E WORK SUPPORT Operation Procedure 1 Touch AIR LEVELIZER on SELECT SYSTEM screen 2 Touch WORK SUPPORT on SELECT DIAG screen 3 Touch item on SELECT WORK ITEM screen 4 Touch START 5 The setting will be changed and ADJUSTMENT COMPLETE will be displayed 6 Touc
37. on switch ON 3 Check voltage between suspension air compressor connector C9 terminal 2 SB and ground A C Suspension air compressor connector an Voltage Approx 12V WEIA0088E 4 Turn ignition switch OFF 5 Check resistance between suspension air compressor connec tor C9 terminal 1 B and ground Continuity should exist 1 5 OK or NG Suspension air compressor connnector OK gt gt Replace the suspension control unit Refer to RSU 46 Gb CONTROL UNIT NG Repair the circuit WEIA0089E Compressor Motor Compressor Motor Relay and Circuit Inspection INSPECTION PROCEDURE 1 sELF DIAGNOSIS RESULT CHECK Check self diagnosis results Self diagnosis results C1802 C1804 C1808 Is the above displayed in the self diagnosis display items YES gt gt code C1802 was retrieved during self diagnosis GO TO 3 If code C1804 or C1808 was retrieved during self diagnosis GO TO 2 NO gt gt Inspection End Revision August 2007 RSU 20 2004 QX56 TROUBLE DIAGNOSIS FOR SELF DIAGNOSTIC ITEMS 2 CHECK SYSTEM OPERATION 1 Load vehicle to standard laden condition with driver front passenger 2 passengers in second row seats and no cargo 2 Conduct active test of EXHAUST SOLENOID to lower vehicle ride height to 20mm 3 Return the rear load leveling air suspension system to normal operating mode 4 Check self diagnostic results
38. on switch ON 2 Check voltage between suspension control unit connector B3 PUE terminal 6 G R and ground and between suspension control a unit connector B3 terminal 7 W L and ground H S Suspension control Voltage Approx 12V unit connector WEIAO069E 3 Turn ignition switch OFF 4 Check resistance between suspension control unit connector B3 terminal 16 B and ground TA mm Continuity should exist Suspension control OK or NG unit connector OK GOTO4 NG Repair the circuit WEIA0070E Revision August 2007 RSU 23 2004 QX56 TROUBLE DIAGNOSES FOR SYMPTOMS 4 CHECK GENERATOR SIGNAL INPUT 1 Start the engine 2 Check voltage between suspension control unit connector B3 terminal 15 BR W and ground Voltage Approx 12V Suspension control unit connector OK NG OK gt gt Replace the suspension control unit Refer to RSU 46 CONTROL UNIT NG Repair the circuit WEIAO071E CK SUSP Indicator Lamp Stays On When Ignition Switch Is Turned On cEsoonE 1 CARRY OUT SELF DIAGNOSIS Carry out self diagnosis Refer to RSU 14 SELF DIAGNOSIS Are malfunctions detected in self diagnosis YES gt gt Refer to RSU 16 Display Item List NO gt gt Refer to 01 31 WARNING LAMPS Revision August 2007 RSU 24 2004 QX56 REAR SUSPENSION ASSEMBLY REAR
39. ransistor for exhaust solenoid is off and monitor volt age continues high level for more than 10 seconds 2 Driving transistor for exhaust solenoid is on and monitor volt age continues low level for more than 5 seconds Refer to RSU 19 Exhaust Valve Solenoid System Inspection RSU Vehicle height adjusting trouble compressor C1804 Continuous compressor relay ON time is more than 120 sec onds Refer to RSU 20 Compres sor Motor Compressor Motor Relay and Circuit Inspection Vehicle height adjusting trouble exhaust solenoid C1805 Continuous exhaust solenoid ON time is more than 120 seconds Refer to RSU 19 Exhaust Valve Solenoid System Vehicle height sensor locking trou Output sensor voltage variation 0 02V is more than 100 hour Refer to RSU 17 Height ble 2 C1806 when vehicle height range is normal Sensor System Inspection Sensor 5V trouble Sensor reference voltage is less than 0 8V or more than 6V for Refer to RSU 17 Height C1807 20 seconds Sensor System Inspection Integral time trouble by supplying air C1808 DATA MONITOR Operation Procedure Integral discontinuous time on the compressor is more than 180 seconds Refer to RSU 20 Compres sor Motor Compressor Motor Relay and Circuit Inspection 1 After turning OFF the ignition switch connect CONSULT II and the CONSULT II CONVERTER to the data link connector
40. s in the reverse order of removal 1 2 3 4 Start the engine Use CONSULT II to perform STANDARD HEIGHT LEVEL work support function Using data monitor of CONSULT II verify HEIGT CALC is at 0 mm Check the vehicle height Refer to RSU 48 Wheelarch Height Unladen If vehicle height is not within 10 mm 0 0 39 in of the specification perform the initialization procedure Refer to RSU 46 Initialization Procedure Revision August 2007 RSU 45 2004 QX56 CONTROL UNIT CONTROL UNIT PFP 47850 Removal and Installation REMOVAL 1 Remove the rear LH interior trim panel Refer to El 34 BODY SIDE TRIM 2 Disconnect the battery negative terminal 3 Disconnect the suspension control unit electrical connector 4 Remove the two bolts and remove the suspension control unit Suspension control unit LEIAO100E INSTALLATION Installation is in the reverse order of removal Suspension control unit bolts 6 N m 0 6 kg m 53 in Ib Initialization Procedure Eee 1 If control unit has been replaced proceed to step 2 If control unit has not been replaced use CONSULT II CLEAR HEIGHT INI work support function to clear initialization flag and value The CK SUSP warning lamp should illuminate Using CONSULT II EXHAUST SOLENOID active test release the air pressure from the rear load leveling air suspension system 2 Roll vehicle forward and backward Use CONSULT II ADJUST
41. s use new caulking nuts for installation New caulking nuts are pre oiled do not apply any additional lubrication Wiring Diagrams and Trouble Diagnosis ees0010z When you read wiring diagrams refer to the following e Gl 15 How to Read Wiring Diagrams e PG 4 POWER SUPPLY ROUTING CIRCUIT for power distribution circuit When you perform trouble diagnosis refer to the following e Gl 11 How to Follow Trouble Diagnoses e GI 27 How to Perform Efficient Diagnosis for an Electrical Incident Revision August 2007 RSU 3 2004 QX56 PREPARATION PREPARATION PFP 00002 Commercial Service Tools Tool name Description Power tool e Removing wheel nuts e Removing brake caliper assembly e Removing rear suspension component parts PBICO190E Revision August 2007 RSU 4 2004 QX56 NOISE VIBRATION AND HARSHNESS TROUBLESHOOTING PFP 00003 NOISE VIBRATION AND HARSHNESS NVH TROUBLESHOOTING NVH Troubleshooting Chart 500111 Use chart below to help you find the cause of the symptom If necessary repair replace these parts Heyg HAN S Hd ONIH3JIS x x X x x Heyo 001000599101 HAN S Sd 5 x x x x Heyo bunoouse gnoJ HAN LAVHS SAIN Xx x bunoouse qno4 LM TH3HM QVOH
42. sary e Check the hoses for air leaks or damage and replace as necessary 500110 Revision August 2007 RSU 26 2004 QX56 REAR SUSPENSION ASSEMBLY Wheel Alignment Inspection EESOOTTH Rear Wheel Alignment Adjusting Bolts WEIA0102E 1 Rear lower link adjusting bolt LH 2 Front lower link adjusting bolt LH 3 Front lower link adjusting bolt RH 4 Rear lower link adjusting bolt RH PRELIMINARY INSPECTION WARNING Always adjust the alignment with the vehicle on a flat surface Use CONSULT II EXHAUST SOLE NOID active test to release the air pressure from the rear load leveling air suspension system NOTE If alignment is out of specification inspect and replace any damaged or worn rear suspension parts before making any adjustments 1 Check and adjust the wheel alignment with the vehicle under unladen conditions Unladen conditions means that the fuel coolant and lubricant are full and that the spare tire jack hand tools and mats are in their designated positions 2 Check the tires for incorrect air pressure and excessive wear Check the wheels for runout and damage Refer to WT 4 Inspection Check the wheel bearing axial end play Axial end 0 mm 0 in Check the shock absorbers Refer to RSU 26 SHOCK ABSORBER INSPECTION Check each mounting point of the suspension components for any excessive looseness or damage Check each link arm and the rear suspension member for any d
43. t 0 2V 4 8V gt gt Ignition switch ON START 5 Reference voltage 5V 6 G R Ignition power Battery voltage 7 W L Battery power 8 G W Ground Diagnostic K line 9 SB Exhaust valve output Ignition switch ON or START Battery voltage 10 BR Warning lamp output 14 L Height sensor ground 15 BR W Alternator L signal input Engine running 16 B Suspension control unit ground OV y Wire color Revision August 2007 RSU 12 2004 QX56 TROUBLE DIAGNOSIS CONSULT II Function AIR LEVELIZER CONSULT II can display each diagnostic item using the diagnostic test modes shown following AIR LEVELIZER Description diagnostic mode Supports inspections and adjustments Commands are transmitted to the suspension control unit for WORK SUPPORT setting the status suitable for required operation input output signals are received from the suspen sion control unit and received data is displayed SELF DIAG RESULTS Displays suspension control unit self diagnosis results DATA MONITOR Displays suspension control unit input output data in real time ACTIVE TEST Operation of electrical loads can be checked by sending drive signal to them ECU PART NUMBER Suspension control unit part number can be read CONSULT II OPERATION CAUTION If CONSULT II is used with no connection of CONSULT II CONVERTER malfunctions might be detected in self diagnosis depending on contr
44. veling air sus pension compressor assembly to the underbody nn Rear load leveling air suspension compressor bolts assembly NN LEIAO090E INSTALLATION Installation is in the reverse order of removal e Toconnect the rear load leveling air suspension hoses the lock ring must be fully seated in the fitting Insert the hose B into the lock ring until the lock ring A is touching the hose as shown Pull on the hose to check that it is securely inserted Hose Lock ring Touch A to B LEIA0078E Revision August 2007 RSU 43 2004 QX56 HEIGHT SENSOR HEIGHT SENSOR PFP 53820 Removal and Installation EEStOIU Rear Load Leveling Air Suspension System SEC 432 175 18 129 9 kg m N m kg m ft ib LEIA0072E 1 Rear load leveling air suspension 2 Shock absorber RH 3 Height sensor hose RH 4 Rear load leveling air suspension 5 Shock absorber LH 6 Rear load leveling air suspension hose LH compressor assembly REMOVAL 1 Use CONSULT II EXHAUST SOLENOID active test to release the air pressure from the rear load level ing air suspension system 2 Disconnect the electrical connector for the height sensor 3 Remove the two height sensor bolts and height sensor arm bracket bolt 4 Remove the height sensor arm bracket bolt LEIAO080E Revision August 2007 RSU 44 2004 QX56 HEIGHT SENSOR INSTALLATION Installation i

REAR SUSPENSION

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