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MTC - 4 8 15 16 23 42

1. 42 REFRIGERATION SYSTEM 16 INSPECTION FLOW seen 42 Refrigeration Cycle 16 SYSTEM DESCRIPTION 43 REFRIGERANT FLOW 16 DIAGNOSTIC PROCEDURE 43 REFRIGERANT SYSTEM PROTECTION 16 MODE DOOR 44 Component Layout 17 Alt Me DOOI a 45 LUBRICANT nrbi neuen 18 INSPECTION FLOW eene 45 Maintenance of Lubricant Quantity in Compressor 18 CONTROL LINKAGE ADJUSTMENT 45 EUBRIGANIT REDE sy 18 Intake Door Motor Circuit 46 CHECKING AND ADJUSTING 18 INSPECTION FLOW 46 AIR CONDITIONER CONTROL 21 SYSTEM DESCRIPTON 47 Control Operation 21 DIAGNOSTIC PROCEDURE 47 Revision May 2004 MTC 1 2002 Altima CONTROL LINKAGE ADJUSTMENT Blower Motor Circuit INSPECTION FLOW DIAGNOSTIC PROCEDURE ELECTRICAL COMPONENTS INSPECTION Magnet Clutch Circuit INSPECTION FLOW DIAGNOSTIC PROCEDURE REFRIGERANT PRESSURE SENSOR Insufficient Cooling I
2. Check blower Check disc to pulley Fix the line with Fix the line tightly motor and fan clearance Refer to rubber or some for wear 2 vibration absorb ing material os Check and adjust compressor lubri cant Refer to 3 Y Replace compressor Loose Belt Side of belt is worn and liquid tank out Noise is intermittent Y Readjust belt The pulley center Y tension does not match Check air discharge Refer to MA 5 Readjust the ducts for obstructions Checking Drive pulley center foreign materials or Belts air leakage SHA331F Revision May 2004 MTC 64 2002 Altima TROUBLE DIAGNOSIS 1 MTC 85 Removal and Installation 3 18 Maintenance of Lubricant 5 14 Checking Drive Belts for Compressor Clutch Quantity in Compressor QR25DE or MA 21 Checking Drive Belts VQ35DE 2 MTC 86 INSTALLATION 4 MTC 38 Operational Check Intake Sensor Circuit DESCRIPTION Intake Sensor The intake sensor is located on the heater and cooling unit It con verts temperature of air after it passes through the evaporator into a resistance value which is then input to the A C control unit After disconnecting intake sensor harness connector measure resis tance between terminals 1 and 2 at sensor harness side using the table below
3. Inflated portion RHA861F Precautions for Servicing Compressor EJS00029 e Plug all openings to prevent moisture and foreign matter from entering e When the compressor is removed store it in the same position as it is when mounted on the car e When replacing or repairing compressor follow Maintenance of Lubricant Quantity in Compres sor exactly Refer to MTC 18 Maintenance of Lubricant Quantity in Compressor e Keep friction surfaces between clutch and pulley clean If the surface is contaminated with lubri cant wipe it off by using a clean waste cloth moistened with thinner e After compressor service operation turn the compressor shaft by hand more than 5 turns in both directions This will equally distribute lubricant inside the compressor After the compressor is installed let the engine idle and operate the compressor for 1 hour e After replacing the compressor magnet clutch apply voltage to the new one and check for normal operation Gap between clutch disc and pulley is 0 3 0 6 mm 0 012 0 024 Precautions for Service Equipment EJS000ZA RECOVERY RECYCLING EQUIPMENT Follow the manufacturer s instructions for machine operation and machine maintenance Never introduce any refrigerant other than that specified into the machine ELECTRONIC LEAK DETECTOR Follow the manufacturer s instructions for tester operation and tester maintenance MTG Revision May 2004 MTC 9 2002 Altima P
4. TO PG POWER J B CONNECTOR 1 158 O W B 1211 10 9181716151 w Revision May 2004 MTC 35 EJS000ZQ MTC A C M 01 DATA LINE CONTROL UNIT M51 REFER TO THE FOLLOWING FUSE BLOCK JUNCTION BOX J B JOINT CONNECTOR WJWA0014E 2002 Altima TROUBLE DIAGNOSIS BLOCK 08 REFER PG POWER TOLT ILL R L ILL BLOWER MOTOR RESISTOR FAN SWITCH M41 BCM BODY CONTROL MODULE REFER TO THE FOLLOWING FUSE BLOCK JUNCTION BOX J B WJWAO015E Revision May 2004 MTC 36 2002 Altima TROUBLE DIAGNOSIS MTC A C M 03 EM DATA LINE WITH QR25DE 4 QR 34 2 KQJ WITH VG35DE BATTERY 113 ir o H o E c m m ul 1 E 2 Z lo z gs 8 26 LU 5 3 4 45461019 gt 92020270 RELAY A C ECM F54 2002 Altima 9 2 5 oa 4 21 8 L 5 5 frac puo D D co 2 5 unite m ws 3 4 H S B KA 161718 B MTC 37 Revision May 2004 TROUBLE DIAGNOSIS Operational Check EJS000ZA The purpose of the operational check is to confirm that the system operates as it should The systems which are
5. 0 2 Imp fl oz of new lubricant when replacing liquid tank RHA065DD Revision May 2004 MTC 20 2002 Altima AIR CONDITIONER CONTROL AIR CONDITIONER CONTROL PFP 27500 Control Operation EJS0002l Fan Temperature Air control control dial control dial dial Air conditioner Air recirculation switch switch WJIAO133E FAN CONTROL DIAL This dial turns the fan ON and OFF and controls fan speed AIR CONTROL DIAL This dial allows control of the outlet air flow In 4 2 or mode the intake door is set to FRESH The compressor turns on when the dial is moved to MAX or TEMPERATURE CONTROL DIAL This dial allows adjustment of the temperature of the outlet air RECIRCULATION REC SWITCH OFF position Outside air is drawn into the passenger compartment ON position Interior air is recirculated inside the vehicle The indicator lamp will also light Recirculation is canceled when 4 or a is selected and resumes when another mode is chosen If the refrigerant pressure sensor input signal is high recirculation is canceled when 2 and 4 mode is selected AIR CONDITIONER A C SWITCH The air conditioner switch controls the A C system When the switch is depressed with the fan ON the com pressor will turn ON The indicator lamp will also light The air conditioner cooling function operates only when the engine is running Revision May 2004 MTC 21 2002 Altima AIR CON
6. 9 Accurate Repair 28 RECOVERY RECYCLING EQUIPMENT 9 WORK FLOW eire e ee 28 ELECTRONIC LEAK DETECTOR 9 SYMPTOM TABLE 2 28 tte 10 ComponentParts and Harness Connector Location 29 MANIFOLD GAUGE SET 10 ENGINE COMPARTMENT 29 SERVICE HOSES 10 PASSENGER COMPARTMENT 31 SERVICE COUPLERS 11 Circuit Diagram 2 32 REFRIGERANT WEIGHT SCALE 11 Wiring Diagram HEATER 33 CALIBRATING ACR4 WEIGHT SCALE 11 Wiring Diagram 35 CHARGING CYLINDER 11 Operational Check 38 Wiring Diagrams and Trouble Diagnosis 11 CONDITIONS 38 222 2 12 PROGEDURE beer 38 Special Service Tools 12 A G Systemi tfi ra tes 40 134 R 134a Service Tools and Equipment 12 DIAGNOSTIC PROCEDURE 40 Commercial Service Tools 15 Mode Door Motor Circuit
7. Vehicle speed signal Oil pressure switch Sleep request1 ma ml a a 4 4 Sleep request2 N range switch signal P range switch signal Seat belt buckle switch signal Door switch signal Tail lamp request Turn indicator signal Buzzer output signal Trunk switch signal QJ a 4 2 ASCD main switch signal ASCD cruise signal D D D D D D Wiper operation Wiper stop position signal Rear window defogger switch signal Rear window defogger control sig nal Revision May 2004 MTC 24 2002 Altima FOR A T MODELS System diagram Input output signal chart Signals AIR CONDITIONER CONTROL ECM COMBINATION METER TCM DATA LINK CONNECTOR COMBINATION METER LKIA0017E T Transmit R Receive BCM IPDM E R Engine speed signal R Engine coolant temperature signal R Accelerator pedal position signal Fuel consumption monitor signal 3 4 4 A T warning lamp signal A T position indicator signal range only Air conditioner switch signal T Air conditioner compressor signal D m A C compressor request signal T Blower fan switch signal R QR25DE Cooling fan motor operation signal R Cooling fan speed request signal T Position lights request Position light
8. Engine tends to overheat Engine cooling systems mal function Check and repair each engine cooling system e area of the low pressure pipe is colder than areas near the evaporator outlet e Plates are sometimes cov ered with frost e Excessive liquid refrigerant on low pressure side e Excessive refrigerant dis charge flow e Expansion valve is open a lit tle compared with the specifi cation 1 Improper thermal valve installation 2 Improper expansion valve adjustment High pressure Side is Too High and Low pressure Side is Too Low Gauge indication Refrigerant cycle Probable cause Replace expansion valve Corrective action High pressure side is too high and low pressure side is too low AC360A Upper side of condenser and high pressure side are hot however liquid tank is not so hot High pressure tube or parts located between compressor and condenser are clogged or crushed High pressure Side is Too Low and Low pressure Side is Too High Gauge indication Refrigerant cycle Probable cause e Check and repair or replace malfunctioning parts e Check lubricant for contami nation Corrective action High pressure side is too low and low pressure side is too high Revision May 2004 High and low pressure sides become equal soon after com pressor operation stops Compressor pressure opera tion is improper Damaged inside compress
9. 3 Fan does not rotate at 2 speed 4 Fan does not rotate at 3 speed 5 Fan does not rotate at 4 speed Revision May 2004 MTC 49 2002 Altima TROUBLE DIAGNOSIS 1 DIAGNOSTIC PROCEDURE Check if blower motor rotates properly at each fan speed Conduct checks as per table above 1 gt gt GO TO 2 2 3 4 gt gt GO 8 5 gt gt GO 10 2 CHECK POWER SUPPLY FOR BLOWER MOTOR Disconnect blower motor harness connector DISCONNECT Terminals 1 44 W Blower motor connector 0 Connector Wire color T M62 1 W L Body ground Yes or No Yes gt gt GO 3 No e Check 15A fuses No 10 and No 11 at fuse block J WJIAD159E B e Check blower relay located in fuse block J B Refer to PG 5 Wiring Diagram POWER CHECK CIRCUIT CONTINUITY FOR BLOWER MOTOR Turn fan control switch to any position except OFF _ ee DISCONNECT Rad Terminals Voltage V ti Ny 9 Approx Blower motor connector Connector Wire color 12V M62 2 L W Body ground Continuity should exist OK or NG OK gt gt GO TO 4 NG gt gt GO TO 5 4 cHECK BLOWER MOTOR Refer to Electrical Components Inspection MTC 53 Blower motor OK or NG OK gt gt INSPECTION END NG gt gt Replace blower motor Revision May 2004 MTC 50 2002 Altima TROUBLE DIAGNOSIS 5 CHECK BLOWER MOTOR CIRCUIT BETWEEN BLO
10. S NT197 Revision May 2004 MTC 12 2002 Altima PREPARATION Tool number Kent Moore No Description Tool name J 39500 NI Function Refrigerant Recovery and Recovery Recycling Recharging equipment ACR4 RJIA0195E Recycling and Recharging J 41995 Electronic refrigerant leak detector AHA281A Power supply e DC 12V Cigarette lighter J 43926 Refrigerant dye leak detection kit Kit includes J 42220 UV lamp and UV safety glasses J 41459 Refrigerant dye injector J 41447 qty 24 134 R 134a refrigerant dye J 43872 Refrigerant dye cleaner 1 UV lamp case 1 w shield Z Refrigerant 422 dye NOTICE is AG or Ratigraton system o recent wate re msl at UV sack Waren MI 28052 1800 445 2233 SHA437F Power supply DC 12V Battery terminal J 42220 Fluorescent dye leak detector SHA438F Power supply DC 12V Battery termi nal For checking refrigerant leak when flu orescent dye is installed in A C system Includes UV lamp and UV safety glasses J 41447 HFC 134a R 134a Fluorescent leak detection dye Box of 24 1 4 ounce bottles Revision May 2004 Refrigerant dye 24 bottles SHA439F MTC 13 Application For HFC 134a R 134a PAG oil Container 1 4 ounce 7 4cc bottle Includes self adhesive dye identifica tion labels for affixing to vehicle afte
11. TROUBLE DIAGNOSIS PERFORMANCE CHART Test Condition Testing must be performed as follows Vehicle location Indoors or in the shade in a well ventilated place Doors Closed Door window Open Hood Open TEMP Max COLD Mode switch 3 Ventilation set Intake switch Recirculation set blower speed Max speed set Engine speed Idle speed Operate the air conditioning system for 10 minutes before taking measurements Test Reading Recirculating to discharge Air Temperature Table Inside air Recirculating air at blower assembly inlet Discharge air temperature at center ventilator Relative humidity Air temperature C F C F 25 77 10 0 12 3 50 54 50 60 30 86 13 2 15 3 56 60 35 95 17 2 21 0 63 70 25 77 12 3 14 9 54 59 60 70 30 86 15 3 19 3 60 67 35 95 21 0 24 4 70 76 Ambient Air Temperature to operating Pressure Table Ambient air ONE High pressure Discharge side Low pressure Suction side Relative humidity Air temperature kPa 2 psi kPa psi 96 C F 30 86 1 220 1 500 240 295 12 44 15 30 176 9 217 5 2 45 9 01 34 8 42 8 1 360 1 690 275 335 35 95 13 87 17 24 197 2 245 1 2 81 3 42 39 9 48 6 40 104 1 500 1 830 310 375 12 44 18 67 176 9 265 4 3 16 3 83 45 0
12. WJIA0188E Revision May 2004 MTC 90 2002 Altima REFRIGERANT LINES 13 Remove the evaporator e Remove the thermo control amplifier e Remove the intake sensor CAUTION e Mark the mounting position of the intake sensor and thermo control amplifier Evaporator WJIA0190E INSTALLATION Installation is in the reverse order of removal Expansion valve mounting bolts 2 9 5 0 N m 0 29 0 51 kg m 26 44 in Ib CAUTION e Replace the O rings with new ones then apply compressor oil to them when installing them Removal and Installation for Expansion Valve EJS00318 REMOVAL 1 Evacuate and recover the A C system refrigerant Refer to 79 134 R 134a Service Proce 2 Disconnect the air cleaner to electronic throttle control actuator tube Refer to 16 AIR CLEANER AND AIR DUCT QR25DE 112 AIR CLEANER AND AIR DUCT VQ35DE NOTE The tube is located between the air cleaner assembly and the intake manifold and is removed to access the expansion valve 3 Disconnect the A C pipe from the expansion valve CAUTION Cap or wrap the joint of the pipe with suitable material such as vinyl tape to avoid the entry of air 4 Remove the cooler grommet 5 Remove the expansion valve Expansion valve Cooler grommet WJIA0128bE INSTALLATION Installation is in the reverse order of removal Expansion valve mounting bolts 2 9 5 0 N m 0 29 0 51 kg m 2
13. allowing a high rate of information transmission with less wiring Each control unit transmits receives data but selectively reads required data only FOR TCS MODELS System diagram Input output signal chart COMBINATION METER DATA LINK CONNECTOR ABS ACTUATOR AND ELECTRIC UNIT CONTROL UNIT 0015 Transmit R Receive COMBINA Signals ECM TCM TION BCM dide IPDM E R METER control uni Engine speed signal T R R Engine coolant temperature signal T R Revision May 2004 MTC 23 2002 Altima Signals AIR CONDITIONER CONTROL ECM TCM COMBINA TION METER BCM ABS TCS control unit IPDM E R Accelerator pedal position signal Fuel consumption monitor signal N T warning lamp signal N T position indicator signal RG range only ABS operation signal TCS operation signal Air conditioner switch signal Air conditioner compressor signal A C compressor request signal Cooling fan motor operation signal Cooling fan speed request signal 2 Position lights request Position lights status Low beam request Low beam status High beam request High beam status Front fog lights request Front fog light status m ama mama OD cancel switch signal 24242 A BD A DE DA DLA Brake switch signal
14. compressor running inject one bottle 1 4 ounce 7 4 cc of fluorescent dye through the low pressure service valve using dye injector tool J 41459 refer to the manufacturer s operat ing instructions 6 With the engine still running disconnect the injector tool from the service fitting CAUTION Be careful the A C system or replacing a component pour the dye directly into the open system con nection and proceed with the service procedures 7 Operate the A C system for a minimum of 20 minutes to mix the dye with the system oil Depending on the leak size operating conditions and location of the leak it may take from minutes to days for the dye to penetrate a leak and become visible Electronic Refrigerant Leak Detector EJS0010W PRECAUTIONS FOR HANDLING LEAK DETECTOR When performing refrigerant leak check use a J 41995 leak detector or equivalent Ensure that the instrument is calibrated and set properly per the operating instructions The leak detector is a delicate device In order to use the leak detec tor properly read the operating instructions and perform any speci fied maintenance J 41995 leak detector SHA196FA Revision May 2004 MTC 92 2002 Altima REFRIGERANT LINES 1 Position probe approximately 5 mm 3 16 in away from point to be checked Approx Y 5 mm 3 16 in 5 707 2 When testing circle each fitting completely with probe 3 Move probe along comp
15. 11 CHECKING RADIATOR 3 46 Intake Door Motor Circuit 0176 0002 QR25DE MA 22 Changing QR25DE or 33 Engine Coolant VQ35DE CHECKING RADIATOR CAP VQ35DE CO 20 Removal and Installation 55 16 FLUSHING COOLING SYS 56 CO 11 Refilling Engine Coolant QR25DE or EC 1110 Overall TEM QR25DE or MA 23 FLUSH QR25DE or CO 33 Refilling Function Check VQ35DE ING COOLING SYSTEM Engine Coolant VQ35DE VQ35DE MTC 38 Operational Check 8 28 SYMPTOM TABLE TROUBLE DIAGNOSIS No ise EJS000ZZ SYMPTOM Noise INSPECTION FLOW 1 Confirm symptom by performing the following operational check If OK symptom can not be duplicated perform complete operational check 4 If NG symptom is confirmed continue with STEP 2 following Y 2 Check for any service bulletins Y 3 Check where noise comes from Blower motor Compressor Expansion valve Refrigerant line Belt Y Y Check for noise in Inspect the com Replace expansion all modes and pressor clutch valve temperature and pulley and settings idler pulley Noise is OK NG constant Check blower Replace com The line is fixed The line is not motor pressor clutch directly to the body fixed eign particles and pulley Refer to 1
16. 34 RADIATOR CAUTION Be careful not to damage the core surface of the condenser and the radiator Revision May 2004 MTC 88 2002 Altima REFRIGERANT LINES 3 Disconnect the high pressure flexible hose and the high pres sure pipe from the condenser CAUTION Cap or wrap the joint of the pipe with suitable material such as vinyl tape to avoid the entry of air 4 Disconnect the refrigerant pressure sensor connector 5 Remove the front fascia Refer to 13 FRONT BUMPER WJIA0124E 6 Remove the mounting nuts from condenser mounting brackets WJIA0125E INSTALLATION CAUTION e Replace the O rings of the high pressure pipe and the high pressure flexible hose with new ones then apply compressor oil to them after installing them e When charging refrigerant check for leaks High pressure flexible hose and pipe mounting bolt Tightening torque 7 8 19 6 N m 0 8 1 9 kg m 69 173 in Ib Condenser mounting nuts Tightening torque 5 0 6 79 N m 0 51 0 69 kg m 45 60 in Ib Removal and Installation for Liquid Tank 600700 View from under vehicle Tank clamp Liquid tank Line clamp so 647 0 51 0 65 d 45 57 N m in Ib 1 Discharge the refrigerant Refer to 79 134 R 134a Service Procedure 2 Remove the battery Revision May 2004 MTC 89 200
17. 54 4 TROUBLE DIAGNOSES FOR ABNORMAL PRESSURE Whenever system s high and or low side pressure is abnormal diagnose using a manifold gauge The marker above the gauge scale in the following tables indicates the standard normal pressure range Since the stan dard normal pressure differs from vehicle to vehicle refer to Ambient Air Temperature to operating Pressure Table above Revision May 2004 MTC 59 2002 Altima TROUBLE D IAGNOSIS Both High and Low pressure Sides are Too High Gauge indication Refrigerant cycle Probable cause Corrective action Both high and low pressure sides are too high Pressure is reduced soon after water is splashed on con denser Excessive refrigerant charge in refrigeration cycle Reduce refrigerant until speci fied pressure is obtained Air suction by cooling fan is insufficient Insufficient condenser cooling performance 1 Condenser fins are clogged 2 fan rotation of cool ing fan e Clean condenser e Check and repair cooling fan as necessary e Low pressure pipe is not cold e When compressor is stopped high pressure value quickly drops by approximately 196 kPa 2 kg cm 28 psi It then decreases gradually thereafter Poor heat exchange in con denser After compressor operation stops high pressure decreases too slowly Air in refrigeration cycle Evacuate repeatedly and recharge system
18. TABLE below 1 MTC 38 Operational Check REPAIR REPLACE Y FINAL CHECK Confirm the repair result by Operational Check T OK CHECK OUT EJS000ZM SHA900E SYMPTOM TABLE Symptom Reference Page e A C system does not come on e Go to Trouble Diagnosis Procedure for A C system MTC 40 e Air outlet does not change e Mode door motor does not operate nor e Go to Trouble Diagnosis Procedure for Mode Door Motor MTC 42 mally e Air Mix door does not change e Go to Trouble Diagnosis Procedure for Air Mix Door MTC 45 e Intake door does not change e Intake door motor does not operate nor e Go to Trouble Diagnosis Procedure for Intake Door Motor MTC 46 mally e Blower motor operation is malfunctioning e Go to Trouble Diagnosis Procedure for Blower Motor MTC 49 e Magnet clutch does not engage e Go to Trouble Diagnosis Procedure for Magnet Clutch MTC 54 e Insufficient cooling e Go to Trouble Diagnosis Procedure for Insufficient Cooling MTC 58 e Insufficient heating e Go to Trouble Diagnosis Procedure for Insufficient Heating MTC 63 e Noise e Go to Trouble Diagnosis Procedure for Noise MTC 64 Revision May 2004 MTC 28 2002 Altima TROUBLE DIAGNOSIS Component Parts and Harness Connector Location ENGINE COMPARTMENT EJS000ZN QR25DE Models Sarl E lt Sac es
19. checked are the blower mode discharge air intake air temperature decrease temperature increase CONDITIONS Engine running at normal operating temperature PROCEDURE 1 Check Blower 1 Turn fan control dial to 1 speed Blower should operate on 1 speed 2 Then turn fan control dial to 2 speed 3 Continue checking blower speed until all four speeds are checked 4 Leave blower on 4 speed If NG go to MTC 49 Blower Motor Circuit If OK continue with next check WJIA0139E 2 Check Discharge Air 1 Turn air control dial to each position 2 Confirm air discharge at all air outlets If NG go to MTC 42 Mode Door Motor Circuit If OK continue with next check WJIA0140E 3 Check Recirculation 1 Press recirculation switch Recirculation indicator should light 2 Listen for intake door position change you should hear blower sound change slightly NOTE Confirm that the RECIRCULATION REC switch is canceled in the FOOT 4 D F and DEF 99 modes If NG go to MTC 46 Intake Door Motor Circuit If OK continue with next check WJIA0141E 4 Check Temperature Decrease 1 Turn fan control dial to 1 speed 2 Turn temperature control dial to full cold 3 Check for cold air at discharge air outlets If NG go to MTC 58 Insufficient Cooling If OK continue with next check WJIA0142E Revision May 2004 MTC 38 2002 Altima TROUBLE DIAGNOSIS 5 Check Temperatu
20. dye cleaning agent on hot surfaces engine exhaust manifold etc Do not use more than one refrigerant dye bottle 1 4 ounce 7 4 cc per A C system Leak detection dyes for R 134a and R 12 A C systems are different Do not use R 134a leak detection dye in R 12 A C systems or R 12 leak detection dye in R 134a A C systems or A C system damage may result e The fluorescent properties of the dye will remain for over three 3 years unless a compressor failure occurs A C Identification Label EJS00027 Vehicles with factory installed fluorescent dye have this identification label on the underside of hood AIR CONDITIONER kissan NOTE REFRIGERANT COMPRESSOR LUBRICANT Vehicles with factory installed fluorescent dye have a green elle Risa San Luminous Oi Type DH PS label AMOUNT KLHOO PAGSO 150 5 03 oz CAUTION PRECAUTION REFRIGERANT UNDER HIGH PRESSURE SYSTEM TO BE SERVICED BY QUALIFIED PERSONEL IMPROPER SERVICE METHODS MAY CAUSE PERSONAL INJURY CONSULT SERVICE MANUAL THIS AIR CONDITIONER SYSTEM COMPLIES WITH SAE Leg Nissan Motor Corporation in USA Carson CA WJIA0012E Revision May 2004 MTC 4 2002 Altima PRECAUTIONS Precautions for Refrigerant Connection EJS00028 A new type refrigerant connection has been introduced to all refrigerant lines except the following locations e Expansion valve to cooling unit e Evaporator pipes to evaporator inside cooling unit e Refrig
21. gt Replace intake sensor Revision May 2004 MTC 66 2002 Altima CONTROL UNIT CONTROL UNIT PFP 27500 Removal and Installation Seen REMOVAL 1 Remove cluster lid C Refer to 12 Cluster Lid C 2 Remove audio unit Refer to AV 22 AUDIO UNIT 3 Remove the temperature control cable clamp and then remove the cable from the air mix door lever Temperature control cable Air mix door Temperature lever control cable clamp 0192 4 Remove the control unit screws then remove it from the instrument panel 5 Disconnect the A C control unit connectors and then remove it WJIA0191E INSTALLATION Installation is in the reverse order of removal Adjustment 1 Attach temperature control cable 2 Rotate control knob to full cold position 3 Remove slack from cable and install temperature control cable clamp After positioning control cable check for proper operation Revision May 2004 MTC 67 2002 Altima INTAKE SENSOR Removal and Installation 1 Remove the evaporator Refer to lation for Evaporator INTAKE SENSOR MTC 90 Removal and Instal 2 Remove the intake sensor clip and then the sensor CAUTION Be careful not to damage the core surface Revision May 2004 MTC 68 PFP 27723 EJS00102 Intake sensor 4 Evaporator core WJIA0100E 2002 Altima BLOWER UNIT BLOWER UNIT PFP 27200 Rem
22. the following Engine coolant level refer to 71 Changing Engine Coolant Hoses for leaks or kinks Radiator cap Refer to 2 Checking Radiator Cap Air in cooling system 2 Check for any service bulletins Repair replace as necessary 4 Visually inspect intake door Access by removing blower unit Go to Diagnostic Procedure for intake door motor 3 Repair leaks 5 Check ducts for air leaks Y OK 6 Check the heater inlet and outlet hose temperature by touching Hot inlet Warm outlet Both hoses warm Repai l Check thermostat installation s 2 Refer to 4 Removal and Installation Check heater hoses for proper installation ry OK OK Back flush heater core drain and refill coolant Replace thermostat Refer to 4 Removal and Installation Refer to 5 Flushing Cooling System Retest Retest Hot inlet Both hoses Warm outlet warm Hot inlet Replace heater core Refill engine coolant Warm outlet Referto 6 Refilling Engine Coolant Hot inlet Warm outlet If the symptom still exists perform a complete operational M Go to Trouble Diagnosis check Refer to Operational Check 7 and check for other symptoms for related io Refer to SYMPTOM TABLE 8 Does another symptom exist 1555 E Another symptom exists No INSPECTION END MA 14 Changing Engine Coolant 2 CO
23. wrench and a back up wrench After disconnecting tubes immediately plug all openings to prevent entry of dirt and moisture When installing an air conditioner in the vehicle connect the pipes as the final stage of the opera tion Do not remove the seal caps of pipes and other components until just before required for connection Allow components stored in cool areas to warm to working area temperature before removing seal caps This prevents condensation from forming inside A C components Thoroughly remove moisture from the refrigeration system before charging the refrigerant Always replace used O rings When connecting tube apply lubricant to circle of the O rings shown in illustration Be careful not to apply lubricant to threaded portion Lubricant name Nissan A C System Oil Type DH PS Part number KLH00 PAGS0 O ring must be closely attached to dented portion of tube When replacing the O ring be careful not to damage O ring and tube Connect tube until you hear it click then tighten the nut or bolt by hand until snug Make sure that the O ring is installed to tube correctly MTC 8 2002 Altima PRECAUTIONS e After connecting line conduct leak test and make sure that there is no leakage from connections When the gas leaking point is found disconnect that line and replace the O ring Then tighten con nections of seal seat to the specified torque Torque wrench Apply lubricant Do not apply lubricant to
24. 02 Altima 7 8 a b 9 1 0 REFRIGERANT LINES NOTE After removing A C manifold gauge set from service valves wipe any residue from valves to prevent any false readings by leak detector Cooling unit Evaporator With engine OFF turn blower fan on High for at least 15 seconds to dissipate any refrigerant trace in the cooling unit Wait a minimum of 10 minutes accumulation time refer to the manufacturer s recommended procedure for actual wait time before inserting the leak detector probe into the drain hose Keep the probe inserted for at least 10 seconds Use caution not to contaminate the probe tip with water or dirt that may be in the drain hose If a leak detector detects a leak verify at least once by blowing compressed air into area of suspected leak then repeat check as outlined above Do not stop when one leak is found Continue to check for additional leaks at all system components If no leaks are found perform steps 7 10 Start engine Set the heater A C control as follows A C switch ON Face mode Intake position Recirculation Max cold temperature Fan speed High Run engine at 1 500 rpm for at least 2 minutes Turn engine off and perform leak check again following steps 4 through 6 above Refrigerant leaks should be checked immediately after stopping the Pressure in high engine Begin with the leak detector at the compressor The pres pressure line sure on the high pressur
25. 1 24 O Nm ft ib 0182 REMOVAL Discharge the refrigerant Refer to MTC 79 HFC 134a R 134a Service Procedure 2 Remove the drive belt Refer to MA 14 ENGINE MAINTENANCE QR25DE ENGINE 3 Disconnect the compressor connector 4 Remove the high pressure flexible hose and low pressure flexible hose CAUTION wrap the joint of the pipe with suitable material such as vinyl tape to avoid the entry of air 5 Remove the mounting bolts from compressor using power tools INSTALLATION CAUTION e Replace the O ring of the low pressure flexible hose and high pressure flexible hose with a new one then apply compressor oil to it when installing it e When charging refrigerant check for leaks Bolts mounting the compressor Tightening torque 28 4 33 3 N m 2 9 3 4 kg m 21 24 ft Ib Tightening torque 59 8 69 6 N m 6 1 7 0 kg m 45 51 ft Ib Bolt mounting the high and low pressure flexible hoses Tightening torque 7 8 19 6 N m 0 8 1 9 kg m 69 173 in Ib Revision May 2004 MTC 83 2002 Altima REFRIGERANT LINES Removal and Installation for Compressor VQ35DE Models EJs00t0 SEC 274 275 0 59 8 69 6 2 56 9 657 6 1 7 0 45 51 2 5 8 6 7 42 48 0 28 4 33 3 0 N m tt Ib 2 9 3 4 21 24 0117 REMOVAL 1 Discharge the refrigerant Refer to MTC 79 1
26. 2 Altima REFRIGERANT LINES 3 Remove the hood switch if equipped 4 Remove the engine undercover using power tools 5 Remove the bolt and line clamp 6 Loosen the tank clamp and remove the liquid tank Removal and Installation for Evaporator 800917 REMOVAL 1 Evacuate and recover the A C system refrigerant Refer to 79 134 R 134a Service Proce dure 2 Disconnect the battery negative terminal 3 Disconnect the air cleaner to electronic throttle control actuator tube Refer to EM 16 AIR CLEANER AND AIR DUCT QR25DE EM 112 AIR CLEANER AND DUCT VQ35DE NOTE The tube is located between the air cleaner assembly and the intake manifold and is removed to access the expansion valve 4 Disconnect the A C pipe from the expansion valve CAUTION Cap or wrap the joint of the pipe with suitable material such as vinyl tape to avoid the entry of air 5 Remove the cooler grommet 6 Remove the expansion valve 7 Remove the center console side finisher RH Refer to IP 16 Center Console 8 Remove the glove box assembly Refer to IP 15 Glove 9 Remove the ECM e Disconnect the ECM connector e Remove the wire harness from the mounting bracket e Remove the two ECM mounting bracket nuts and disconnect Cooler grommet the ground wire EE 10 Remove the blower unit Refer to MTC 69 BLOWER UNIT 11 Remove the heater core cover 12 Remove the evaporator cover
27. 34 R 134a Service Procedure Remove the drive belt Refer to MA 21 ENGINE MAINTENANCE VQ35DE ENGINE Remove the coolant pipe bracket bolt Remove compressor mounting stud Disconnect the compressor connector Remove the high pressure flexible hose and low pressure flexible hose CAUTION Cap or wrap the joint of the pipe with suitable material such as vinyl tape to avoid the entry of air 7 Remove the mounting bolts and nut from compressor using power tools INSTALLATION CAUTION e Replace the O ring of the low pressure flexible hose and high pressure flexible hose with a new one then apply compressor oil to it when installing it e When charging refrigerant check for leaks N Bolts mounting the compressor rear side Tightening torque 56 9 65 7 5 8 6 8 kg m 42 48 ft Ib Bolt mounting the compressor front side Tightening torque 28 4 33 3 N m 2 9 3 4 kg m 21 24 ft Ib Nut mounting the compressor front side Tightening torque 59 8 69 6 N m 6 1 7 0 kg m 45 51 ft Ib Bolt mounting the high and low pressure flexible hoses Tightening torque 7 8 19 6 N m 0 8 1 9 kg m 69 173 in Ib Revision May 2004 MTC 84 2002 Altima Removal and Installation for REMOVAL e When removing center bolt hold clutch disc with clutch disc tool e Remove the clutch disc Clutch disc holding tool J 44614 Commercial service tool e Remove the snap ring using e
28. 6 60 40 5 80 20 qve 60 40 Im e 10096 2 Check for service bulletins lt NG 3 Check mode door operation 41 p Go to Trouble Diagnosis Procedure for mode door motor 5 If the symptom still exists perform a complete operational check 2 and check for other symptoms Refer to symptom table 3 Does another symptom exist INSPECTION END Yes Go to Trouble Diagnosis for related symptom 1 44 MODE DOOR 2 MTC 38 Operational Check 4 Revision May 2004 3 MTC 28 SYMPTOM TABLE MTC 42 Another symptom exists 0205 5 MTC 43 DIAGNOSTIC DURE MTC 22 Discharge Air Flow 2002 Altima TROUBLE DIAGNOSIS SYSTEM DESCRIPTION Mode Door Motor The mode door motor is installed on the heater unit Using a link it operates the mode door When the air control dial is turned to each position the mode door motor moves the mode door to control air flow direction MODE DOOR 8 AIC CONTROL UNIT 12 0206 0200 DIAGNOSTIC PROCEDURE SYMPTOM Mode door motor does not operate normally AIC CONTROL 3 UNIT MODE DOOR MOTOR 0207 1 CHECK BODY GROUND CIRCUIT FOR MODE DOOR MOTOR DISCONNECT Terminals Continuity E ra Connector Wire color M40 2 B Mode do
29. 6 44 in Ib CAUTION e Replace the O rings with new ones then apply compressor oil to them when installing them Checking for Refrigerant Leaks EJs0010T Perform a visual inspection of all refrigeration parts fittings hoses and components for signs of A C lubricant leakage damage and corrosion A C lubricant leakage may indicate an area of refrigerant leakage Allow extra inspection time in these areas when using either an electronic refrigerant leak detector or fluorescent dye leak detector If dye is observed confirm the leak with an electronic refrigerant leak detector It is possible a prior leak was repaired and not properly cleaned When searching for leaks do not stop when one leak is found but continue to check for additional leaks at all system components and connections Revision May 2004 MTC 91 2002 Altima REFRIGERANT LINES When searching for refrigerant leaks using an electronic leak detector move the probe along the suspected leak area at 25 50 mm 1 2 in per second and no further than 6 mm 1 4 in from the component CAUTION Moving the electronic leak detector probe slower and closer to the suspected leak area will improve the chances of finding a leak Checking System for Leaks Using the Fluorescent Leak Detector Senat 1 Check A C system for leaks using the UV lamp and safety glasses J 42220 in a low sunlight area area without windows preferable Illuminate all components fittings and lines The dye
30. DITIONER CONTROL Discharge Air Flow See Face Foot Defroster CE switch ON Defroster door Ventilator Recirculation air i t lt lt Air mix door Bi level C switch OFF Intake doors Defroster Outside air fer to Operational Check For air flow 96 refer TROUBLE DIAGNOSES 0016 Revision May 2004 MTC 22 2002 Altima System Description SWITCHES AND THEIR CONTROL FUNCTION AIR CONDITIONER CONTROL Knob Switch position Knob Switch WI Air outlet Intake air EJS000ZK Compressor ON 1 3 1 Compressor is operated by 2 In v pf 3 modes REC switch is canceled 3 Compressor operates if A C switch is ON 4 Recirculation operates if REC switch is ON CAN Communication System Description 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 error detection ability Many elec WJIAO134E 00021 MTC tronic control units are equipped onto a vehicle and each control unit shares information and links with other control units during operation not independent In CAN communication control units are connected with 2 communication lines CAN H line CAN L line
31. EATER CORE HEATER CORE Removal and Installation 1 Remove heater and cooling unit Refer to 3 Remove heater core cover screws and then remove it 4 Remove heater core Revision May 2004 MTC 73 Removal and Installation 2 Remove heater core pipe support screws and then remove it MTC 74 PFP 27140 EJS00107 WJIA0185E WJIA0127E Heater WJIA0186E 2002 Altima MODE DOOR MOTOR MODE DOOR MOTOR PFP 27731 Removal and Installation DRIVER SIDE MODE DOOR MOTOR 1 Remove the driver lower instrument panel assembly Refer to 13 Driver Lower Instrument Panel 2 Disconnect the mode door motor connector 3 Remove the mode door motor screws and then remove it WJIA0200E Revision May 2004 MTC 75 2002 Altima BLOWER FAN RESISTER BLOWER FAN RESISTER PFP 27150 Removal and Installation See 1 Disconnect blower motor resistor connector 2 Remove blower motor resistor screws and then remove it Blower motor resistor 0193 Revision May 2004 MTC 76 2002 Altima DUCTS AND GRILLES DUCTS AND GRILLES Removal and Installation Ventilator Duct Defroster Nozzle and Detroster Ducts PFP 27860 EJS0010A EJS0010B Center defroster nozzle Side defroster duct Side defroster duct Ventilator duct Instrument Side ventilator panel grille RH Side ventilator Center ventilator i 3 rille grille LH g 0112 Center
32. H POSITION Continuity between terminals OFF 1 4 5 6 2 3 5 6 3 2 5 6 4 1 5 6 0157 Blower motor Confirm smooth rotation of the blower motor e Ensure that there are no foreign particles inside the intake unit Blower Motor Resistor Check resistance between terminals Blower motor Terminal No Resistance Q Approx 3 0 9 1 1Q 4 1 2 27 2 780 2 0 3 0 380 Blower motor resistor 0158 Revision May 2004 MTC 53 2002 Altima TROUBLE DIAGNOSIS Magnet Clutch Circuit Symptom e Magnet clutch does not engage when switch and fan switch are ON INSPECTION FLOW 1 4 1 Confirm symptom by performing the following operational check OPERATIONAL CHECK A C switch Turn fan control dial to the desired 1 to 4 speed position and push the air conditioner switch to turn ON the air conditioner The indicator light should come on when air conditioner is ON 2 Check for any service bulletins Adjust or replace compressor belt 3 Check compressor belt tension Refer to MA 5 Checking Drive Belts Connect manifold gauge then check system pressure OK Check for refrigerant leaks Refer to 1 Go to Trouble Diagnosis for related symptom INSPECTION END If the symptom still exists perform a complete operatio
33. ICANT Model CALSONIC KANSEI make DKS 17D Name Nissan A C System Oil Type DH PS Part number KLH00 PAGS0 Total in system 150 5 03 5 3 Capacity m 0 US fl oz Imp fl oz Compressor Service part charg 150 5 03 5 3 ing amount 5 REFRIGERANT Type HFC 134a R 134a Capacity _ kg Ib 0 475 0 525 1 045 1 155 ENGINE IDLING SPEED Refer to 38 Idle Speed and Ignition Timing Check QR25DE models or EC 656 Idle Speed and ont tion Timing Check VQ35DE models BELT TENSION Refer to MA 14 ENGINE MAINTENANCE QR25DE ENGINE or MA 21 ENGINE MAINTENANCE VQ35DE ENGINE Revision May 2004 MTC 95 2002 Altima SERVICE DATA AND SPECIFICATIONS SDS Revision May 2004 MTC 96 2002 Altima
34. ITH VQ35DE IGNITION SWITCH IGNITION SWITCH OR 8 IPDM E R pene INTELLIGENT POWER FUSE FUSE FUSE FUSE DISTRIBUTION DULE ENGINE ROOM AIC RELAY BLOWER MOTOR 2 1 2 70 71 ECM AIC COMPRESSOR BLOWER MOTOR RESISTOR CONTROL BCM 1 58 FAN SWITCH OFF 5 65 TO ILLUMINATION gt SYSTEM MODE 3 DOOR MOTOR INTAKE 12 SENSOR 9 1 INTAKE DOOR MOTOR 1 1 Le WJWA0011E 2002 Altima TROUBLE DIAGNOSIS Wiring Diagram HEATER Seen MTC HEATER 01 FUSE REFER TO PG POWER J B wu mE OE DATA LINE NEXT CONNECTOR NN 4 G B gt PAGE TO LT ILL G B 51 ILL 2 E CONTROL UNIT M51 INTAKE DOOR MOTOR 1 ENT L w REFER TO THE FOLLOWING FUSE BLOCK JUNCTION BOX J B M40 M58 4 3 2 1 116 JOINT CONNECTOR Ww B w Kun J C WJWAO012E Revision May 2004 MTC 33 2002 Altima TROUBLE DIAGNOSIS MTC HEATER 02 IGNITION SWITCH ON FUSE REFER BLOWER L MOTOR M 1 PRECEDING G B 9 g REFER TO THE FOLLOWING FUSE BLOCK JUNCTION BOX J B Don SE M63 M63 HH anank WJWA0013E Revision May 2004 MTC 34 2002 Altima TROUBLE DIAGNOSIS Wiring Diagram A C M IGNITION SWITCH ON OR START FUSE BLOCK
35. J AIR CONDITIONER SECTION C MANUAL AIR CONDITIONER CONTENTS PRECAUTIONS aae 3 FAN CONTROL DIAL 21 Precautions for Supplemental Restraint System AIR CONTROL DIAL 21 585 AIR and 5 BELT PRE TEN TEMPERATURE CONTROL DIAL 21 SIONER edet tere ttt 3 RECIRCULATION REC SWITCH 21 Precautions for Working with HFC 134a R 134a 3 AIR CONDITIONER A C SWITCH 21 Contaminated Refrigerant 3 Discharge Air Flow nk 22 General Refrigerant Precautions 4 System Description 23 Precautions for Leak Detection Dye 4 SWITCHESAND THEIR CONTROL FUNCTION 23 A C Identification Label 4 CAN Communication System Description 23 Precautions for Refrigerant Connection 5 FOR TCS MODELS u uuu 23 FEATURES OF NEW TYPE REFRIGERANT FOR MODELS 25 CONNECTION esee 5 FOR MODELS 26 O RING AND REFRIGERANT CONNECTION 6 TROUBLE DIAGNOSIS 28 Precautions for Servicing Compressor 9 How to Perform Trouble Diagnoses for Quick and Precautions for Service Equipment
36. L 3 UNIT INTAKE DOOR MOTOR 1 CHECK BODY GROUND CIRCUIT FOR INTAKE DOOR MOTOR DISCONNECT Terminals Continuity E Wire color M58 2 B Intake door motor connector Body ground Yes Continuity should exist If OK check harness for short OK or NG OK gt gt GO TO 2 NG gt gt Repair harness or connector Revision May 2004 MTC 47 0149 0150 WJIA0151E WJIA0152bE 2002 Altima TROUBLE DIAGNOSIS 2 CHECK CIRCUIT CONTINUITY BETWEEN EACH TERMINAL ON CONTROL UNIT AND ON INTAKE DOOR MOTOR E Terminals Continuity Connectors Wire colors Connectors Wire colors intake door motor mm M51 9 L B M58 3 L B Yes connector 51 12 L R M58 1 L R i 3 Continuity should exist If OK check harness for short OK or NG OK gt gt GO TO3 NG Repair harness or connector 3 CHECK FOR A C CONTROL UNIT OUTPUT WJIA0154E Measure voltage across A C control unit harness terminals and body ground Terminals RECIRCU 7 a Voltage V LATION Condition Approx Connectors Wire colors 51 9 L B 12V REC ON REC M51 12 L R Body 0V M51 9 L B ground ov FRE OFF FRE M51 12 L R 12V OK or NG OK gt gt Replace intake door motor NG gt gt Replace A C control unit CONTROL LINKAGE ADJUSTMENT 1 Install intake door motor on
37. MPTOM e A C system does not come on 1 CHECK POWER SUPPLY CIRCUIT FOR A C CONTROL UNIT DISCONNECT N Terminal Voltage Y 44 th Approx A C control unit connector ee Wire color Connector Body ground 12V M51 2 G OK or NG OK gt gt GO TO 2 NG gt gt Check 10A fuse No 12 at fuse block J B WJIA0147E Revision May 2004 MTC 40 2002 Altima TROUBLE DIAGNOSIS 2 CHECK BODY GROUND CIRCUIT FOR A C CONTROL UNIT DISCONNECT Terminal Continuity E LS Connector Wire color Body ground Yes A C control unit connector T Inn If OK check harness for short OK or NG OK INSPECTION END ad NG gt gt If repair harness or connector 7 0146 Revision 2004 41 2002 Altima TROUBLE Mode Door Motor Circuit SYMPTOM Air outlet does not change e Mode door motor does not operate normally INSPECTION FLOW DIAGNOSIS EJS000ZT 1 Confirm symptom by performing the following operational check OPERATIONAL CHECK Discharge air 1 Turn air control dial to each position 2 Confirm that discharge air comes out according to the air distribution table at left Refer to Discharge Air Flow in DESCRIPTION Discharge air flow 4 Mode door distribution switch Face Foot Defroster 29 1009
38. NSPECTION FLOW PERFORMANCE CHART TROUBLE DIAGNOSES FOR ABNORMAL PRESSURE Insufficient Heating INSPECTION FLOW Noise INSPECTION FLOW Intake Sensor Circuit COMPONENT DESCRIPTION DIAGNOSTIC PROCEDURE CONTROL UNIT J Removal and Installation REMOVAL INSTALLATION INTAKE SENSOR Removal and Installation BLOWER UNIT Removal and Installation REMOVAL BLOWER MOTOR Removal and Installation INTAKE DOOR MOTOR Removal and Installation IN CABIN MICROFILTER Removal and Installation FUNCTION REPLACEMENT TIMING REPLACEMENT PROCEDURES HEATER amp COOLING UNIT ASSEMBLY Removal and Installation REMOVAL INSTALLATION HEATER CORE Removal and Installation MODE DOOR MOTOR Removal and Installation DRIVER SIDE MODE DOOR MOTOR BLOWER FAN RESISTER Removal and Installation DUCTS AND GRILLES Removal and Installation Ventilator Duct Defroster Nozzle and Defroster Bloc ETE Center Ventilator Grille Side Ventilator Grille LH Side Ventilator Grille RH Floor dut EET Revision May 2004 48 REFRIGERANT LINES 79 49 134 R 134a Service Procedure 79 49 SETTING OF SERVICE TOOLS AND EQUIP 49 MENT dei to hec dh 79 53 80 54 Removal Installation for 54 QR25DE Models 83 55 REMOVA v
39. PLACEMENT Ne CBEPLAGE THE PART EVERY 30 000 KM OH T YEAR 5 868 LJIA0013E 2002 Altima 1 HEATER amp COOLING UNIT ASSEMBLY HEATER amp COOLING UNIT ASSEMBLY PFP 27110 Removal and Installation REMOVAL Discharge refrigerant from A C system Refer to MTC 79 134 R 134a Service Procedure 2 Drain coolant from cooling system Refer to MA 14 Changing Engine Coolant QR25DE models or MA 22 Changing Engine Coolant VQ35DE models 3 Disconnect heater hoses from heater core pipes 4 Disconnect refrigerant lines from evaporator CAUTION Cap or wrap the joint of the pipe with suitable material such as vinyl tape to avoid entry of air 5 Remove the instrument panel Refer to 10 INSTRUMENT PANEL ASSEMBLY 6 Remove the blower unit Refer to MTC 69 Removal and Installation 7 Remove the temperature control cable clamp and then remove Rue the cable from the air mix door lever Air mix door Temperature lever control cable clamp 8 Disconnect mode door motor connector 9 Remove the heater and cooling unit INSTALLATION Install in the reverse order of removal NOTE When filling radiator with coolant refer to CO 11 Refilling Engine Coolant QR25DE models or CO 33 Refilling Engine Coolant VQ35DE models Recharge the A C system Refer to MTC 79 HFC 134a R 134a Service Procedure Revision May 2004 MTC 73 2002 Altima H
40. RECAUTIONS VACUUM PUMP The lubricant contained inside the vacuum pump is not compatible with the specified lubricant for HFC 134a R 134a A C systems With isolator valve Hose fittings The vent side of the vacuum pump is exposed to atmospheric pres 1 2 16 sure so the vacuum pump lubricant may migrate out of the pump into the service hose This is possible when the pump is switched off after evacuation vacuuming and hose is connected to it To prevent this migration use a manual valve situated near the hose to pump connection as follows e Usually vacuum pumps have a manual isolator valve as part of the pump Close this valve to isolate the service hose from the pump For pumps without an isolator use a hose equipped with a man ual shut off valve near the pump end Close the valve to isolate the hose from the pump e If the hose has an automatic shut off valve disconnect the hose from the pump as long as the hose is connected the valve is open and lubricating oil may migrate Some one way valves open when vacuum is applied and close under a no vacuum condition Such valves may restrict the pump s ability to pull a deep vacuum and are not recommended RHA270D MANIFOLD GAUGE SET Be certain that the gauge face indicates R 134a or 134a Make sure the gauge set has 1 2 16 ACME threaded connections for service hoses Confirm the set has been used only with refrigerant HFC 134a R 134a along with
41. S 9 CHECK RESISTOR HARNESS CONNECTOR resistor harness connector OK or NG 1 gt gt GO TO 12 2 3 4 gt gt GO TO 10 1 0 CHECK FAN SWITCH CIRCUIT Do approx 12 volts exist between each fan switch harness connec tor terminal and body ground DISCONNECT eee V E AE Terminal Fan switch Test group No Voltage V z Connector Wire color 2 41 4 L B 3 M41 3 L R Body ground 12V 4 41 2 5 M41 1 L W WJIAO164E Yes or No Yes GO TO 12 No GO TO 11 11 CHECK CIRCUIT CONTINUITY BETWEEN FAN SWITCH HARNESS TERMINAL AND RESISTOR HARNESS TERMINAL NEN DISCONNECT Terminal No E Fan switch Resistor Continuity Fan switch connector Blower motor resistor Connectors Wire colors Connectors Wire colors iTs connectar M41 4 L B M63 4 L B BEI 41 3 L R 63 3 L R Yes M41 2 L Y M63 2 L Y M41 1 L W M63 1 L W WJIA0165E OK or NG OK gt gt Check harness for short NG gt gt Repair harness or connector 12 CHECK FAN SWITCH Refer to MTC 53 Fan Switch OK or NG OK gt gt INSPECTION END NG gt gt Replace fan switch Revision May 2004 MTC 52 2002 Altima TROUBLE DIAGNOSIS ELECTRICAL COMPONENTS INSPECTION Fan Switch Check continuity between terminals at each switch position SWITC
42. Temperature C F Resistance 15 5 12 34 10 14 9 62 KH Intake sensor connector 5 23 7 56 EE 0 32 6 00 5 41 4 80 10 50 3 87 15 59 3 15 20 68 2 57 25 77 2 12 30 86 1 76 35 95 1 47 40 104 1 23 45 113 1 04 If NG replace intake sensor DIAGNOSTIC PROCEDURE SYMPTOM Intake sensor circuit is open or shorted INTAKE SENSOR 0177 Revision 2004 65 2002 Altima TROUBLE DIAGNOSIS 1 CHECK INTAKE SENSOR CIRCUIT BETWEEN INTAKE SENSOR AND BODY GROUND Disconnect intake sensor harness connector DISCONNECT Terminal Continuity A LS Connector Wire color Body ground Yes Intake sensor connector M53 1 B 1 NG OK gt gt GO TO 2 NG gt gt Repair harness or connector WJIA0178E 2 CHECK INTAKE SENSOR CIRCUIT BETWEEN INTAKE SENSOR AND A C CONTROL UNIT Disconnect A C control unit harness connector DISCONNECT Terminals Continuity E LS Connector Wire color Connector Wire color Intake sensor connector A C control unit connector Yes M53 2 R G M51 6 R G Hr o DN 2 NG Ium OK gt gt GO 3 NG Repair harness or connector WJIA0179E 3 CHECK INTAKE SENSOR Refer to MTC 65 Intake Sensor OK or NG OK gt gt Replace A C control unit NG gt
43. Ventilator Grille 1 Remove cluster lid D Refer to 13 Cluster Lid D 2 Release the tabs to remove center ventilator grille Cluster lidi D Center ventilator grille EJS0010C Side Ventilator Grille LH 1 Remove cluster lid A Refer to IP 13 Cluster Lid 2 Remove side ventilator grille LH EJS0010D 0114 Revision May 2004 MTC 77 2002 Altima DUCTS AND GRILLES Side Ventilator Grille RH See 1 Remove glove box assembly Refer to IP 15 Glove 2 Remove side ventilator grille RH screw and then remove it WJIA0108E Floor duct Semer 1 Remove the carpet Refer to El 32 FLOOR TRIM 2 Release foam tape and slide floor duct rearward to release from clips Foam tape Foam tape WJIA0115E Revision May 2004 MTC 78 2002 Altima REFRIGERANT LINES REFRIGERANT LINES PFP 92600 HFC 134a R 134a Service Procedure 800108 SETTING SERVICE TOOLS AND Discharging Refrigerant WARNING Avoid breathing A C refrigerant and lubricant vapor or mist Exposure may irritate eyes nose and throat Remove HFC 134a R 134a from A C system using certified service equipment meeting requirements of SAE J2210 R 134a recycling equipment or J2201 R 134a recovery equipment If accidental system discharge occurs ventilate work area before resuming service Additional health and safety information may be obtained from refrigerant and lubri
44. WER MOTOR AND RESISTOR 24 9S Reconnect blower motor harness connector Terminals Voltage V Blower motor resistor Approx connector Connector Wire color 12 RLLIJ M63 1 L W Body ground Yes or No EX BED Oo Yes gt gt GO TO 7 No gt gt GO TO 6 WJIA0161E 6 CHECK CIRCUIT CONTINUITY BETWEEN BLOWER MOTOR AND RESISTOR Disconnect blower motor and resistor harness connectors Terminals Connector Wire color Connector Wire color Continuity 63 1 L W M62 2 L W Yes Blower motor resistor connector DILI Blower motor connector Continuity should exist If OK check harness for short OK or NG OK gt gt INSPECTION END NG gt gt Repair harness or connector 0162 7 CHECK GROUND CIRCUIT FOR SWITCH e Disconnect fan switch harness connector e Check circuit continuity between fan switch harness terminal and body ground E 9 Fan switch connector Terminals Voltage V 5 Approx BER Connector Wire color 12V M41 5 B Body ground OK or NG OK gt gt 8 NG gt gt Repair harness or connector 8 CHECK BLOWER MOTOR RESISTOR Refer to MTC 53 Blower Motor Resistor OK or NG OK gt gt GO TO 9 NG gt gt Replace blower motor resistor Revision May 2004 MTC 51 2002 Altima TROUBLE DIAGNOSI
45. YMPTOM Air mix door does change INSPECTION FLOW 1 Confirm symptom by performing Operational Check Step 4 Check Tem perature Decrease and Step 5 Check Temperature Increase 1 If OK symptom cannot be duplicated perform complete Operational Check 1 If NG symptom is confirmed continue with STEP 2 below 2 Check for service bulletins 3 Visually check air mix door linkage operation gt Go to CONTROL LINKAGE s ADJUSTMENT 3 4 Visually inspect air mix door air mix door Perform a complete Operational Check 1 and check for other symptoms Refer to SYMPTOM TABLE 2 Does another symptom exist Go to TROUBLE DIAGNOSIS for related symptom 0288 1 38 2 28 3 MTC 45 CONTROL LINKAGE ADJUSTMENT Temperature control cable 1 Attach temperature control cable m Temperature 2 Rotate control knob to full cold position S control cable 3 Remove slack from cable and install temperature control cable clamp After positioning control cable check for proper operation Air mix door Temperature lever control cable clamp 0192 Revision 2004 45 2002 Altima TROUBLE DIAGNOSIS Intake Door Motor Circuit See Symptom e Intake door does not change e Intake door motor does
46. amination may have occurred e f you choose to perform the repair recover the refrigerant using only dedicated equipment and contain ers Do not recover contaminated refrigerant into your existing service equipment your facility does not have dedicated recovery equipment you may contact a local refrigerant product retailer for avail able service This refrigerant must be disposed of in accordance with all federal and local regulations In addition replacement of all refrigerant system components on the vehicle is recommended Revision May 2004 MTC 3 2002 Altima PRECAUTIONS If the vehicle is within the warranty period the air conditioner warranty is void Please contact Nissan Cus tomer Affairs for further assistance General Retrigerant Precautions EJs00025 WARNING e not release refrigerant into the air Use approved recovery recycling equipment to capture the refrigerant every time an air conditioning system is discharged e Always wear eye and hand protection goggles and gloves when working with any refrigerant or air conditioning system Do not store or heat refrigerant containers above 52 125 F Do not heat a refrigerant container with an open flame if container warming is required place the bottom of the container in a warm pail of water e Donot intentionally drop puncture or incinerate refrigerant containers e Keeprefrigerant away from open flames poisonous gas will be produced if refri
47. blower unit Ensure that the intake door motor lever is fitted into the slit por tion of intake door link 2 Connect the intake door motor harness connector Turn ignition switch to 4 Check that intake door operates properly when RECIRCULA TION switch is turned ON and OFF Revision May 2004 MTC 48 Intake door motor WJIA0150E 2002 Altima TROUBLE DIAGNOSIS Blower Motor Circuit Symptom e Blower motor operation is malfunctioning INSPECTION FLOW EJS000ZV 1 Confirm symptom by performing the following operational check OPERATIONAL CHECK Blower motor 1 Turn fan control dial to 1 speed Blower should operate on 1 speed 2 Then turn fan control dial to 2 speed 3 Continue checking blower speed until all four speeds are checked 4 Leave blower on 4 speed 2 Check any service bulletins 3 Check blower motor circuit 1 INSPECTION END If the symptom still exists perform a complete dees See operational check 2 and check for other or related symptom symptoms Another symptom exists Refer to symptom table 3 Does another symptom exist 0156 1 MTC 49 Blower Motor Circuit 2 MTC 38 Operational Check 3 MTC 28 SYMPTOM TABLE DIAGNOSTIC PROCEDURE SYMPTOM e Blower motor operation is malfunctioning Test group No INCIDENT 1 Fan fails to rotate 2 Fan does not rotate at 1 speed
48. cant manufacturers Recovery Recycling equipment ACRA J 39500 INF with refrigerant identifier Evacuating System and Charging Refrigerant Preferred Best method Manifold gauge set 139183 p Shuto 2 valve service Refrigerant container HFC 134a Recovery Recycling For evacuating equipment 4 J 39650 acuut J 39500 INF with 439649 refrigerant identifier SHA180FD Revision May 2004 MTC 79 2002 Altima REFRIGERANT LINES Before connecting ACR4 to vehicle check ACR4 gauges No refrigerant pressure should be displayed If OK recover refrigerant from equipment lines Y Recovered lubricant Refer to CHECKING AND ADJUSTING 1 Confirm refrigerant purity in supply tank Refer to Contaminated using ACR4 and refrigerant identifier NG refrigerant 5 y OK Connect ACR4 to vehicle Refer to Contaminated Confirm refrigerant purity in vehicle A C NG refrigerant 5 system using ACR4 and refrigerant identifier v Set the recovery recycling equipment Discharge refrigerant into recovery recycling equipment Repair or replace parts Y Evacuate over 25 minutes Note 1 Before charging refrigerant ensure engine is off Note 2 Befofe checking for leaks start engine to activate air conditioning system then turn engine off Service valve caps must b
49. ce Tools PREPARATION EJS000ZE Tool name Description J 41810 NI Checks refrigerant purity and for sys Refrigerant identifier equipment tem contamination R 134a RJIA0197E Power tool Loosening bolts and nuts 0190 2 44614 Clutch disc holding tool Revision May 2004 MTC 15 WHA230 Clutch disc holding tool 2002 Altima REFRIGERATION SYSTEM REFRIGERATION SYSTEM PFP KA990 Refrigeration Cycle Se REFRIGERANT FLOW The refrigerant flows in the standard pattern that is through the compressor the condenser the liquid tank through the evaporator and back to the compressor The refrigerant evaporation through the evaporator coil is controlled by an externally equalized expansion valve located inside the evaporator case REFRIGERANT SYSTEM PROTECTION Refrigerant Pressure Sensor The refrigerant system is protected against excessively high or low pressures by the refrigerant pressure sen sor located on the condenser If the system pressure rises above or falls below the specifications the refriger ant pressure sensor detects the pressure inside the refrigerant line and sends the voltage signal to the ECM ECM makes the A C relay go OFF and stops the compressor when pressure on the high pressure side detected by refrigerant pressure sensor is over about 2 746 kPa 28 kg cm 398 psi or below about 120 kPa 1 22 kg cm 17 4 psi Pressure Relief Valve The refrigerant system is al
50. ch as vinyl tape to avoid the entry of air 2 Remove the low pressure flexible hose Refer to 80 Components INSTALLATION CAUTION e Replace the O ring of the low pressure flexible hose with a new one then apply compressor oil to it when installing it e When charging refrigerant check for leaks Bolt mounting the low pressure flexible hose evaporator side Tightening torque 2 9 5 9 N m 0 29 0 60 kg m 26 52 in Ib Bolt mounting the low pressure flexible hose compressor side Tightening torque 7 8 19 6 N m 0 8 1 9 kg m 69 173 in Ib Revision May 2004 MTC 87 2002 Altima REFRIGERANT LINES Bolt connecting the low pressure flexible hose in line connection VQ35DE models Tightening torque 7 8 19 6 N m 0 8 1 9 kg m 69 173 in Ib Removal and Installation for High pressure flexible hose Senge REMOVAL 1 Discharge the refrigerant Refer to MTC 79 134 R 134a Service Procedure 2 Remove the high pressure flexible hose Refer to MTC 80 Components CAUTION Cap or wrap the joint of the pipe with suitable material such as vinyl tape to avoid the entry of air INSTALLATION CAUTION e Replace the O ring of the high pressure flexible hose with a new one then apply compressor oil to it when installing it e When charging refrigerant check for leaks Bolts mounting the high pressure flexible hose Tightening torque 7 8 19 6 0 8 1 9 kg m 69 173 in Ib Rem
51. d refrigerant 4 Confirm refrigerant purity in supply tank using ACR4 and refrigerant identifier Connect ACR4 to vehicle Confirm refrigerant purity in vehicle A C system using ACR4 and refrigerant identifier Refer to Contaminated refrigerant 4 Perform Performance Test Diagnoses Refer to 76 Replace compressor 7 6 Check refrigeration cycle pressure with manifold gauge connected Refer to 75 OK 7 Check for evaporator coil freeze up Does not freeze up Y OK NG 8 Check ducts for air leaks Repair air leaks Y OK Yes Go to Trouble Diagnosis for related symptom If the symptom still exists perform a complete operational Another symptom exists NG Freeze up check 8 and check for other symptoms Refer to symptom table 9 Does another symptom exist No INSPECTION END 0002 WJIA0175E MA 14 Checking Drive Belts 2 MTC 46 Intake Door Motor Circuit 3 EC Section QR25DE or MA 21 Checking Drive Belts VQ35DE MTC 3 Contaminated Refrigerant 5 MTC 79 HFC 134a R 134a Ser 76 59 Performance Chart vice Procedure MTC 83 Removal and Installation 8 MTC 38 Operational Check 9 MTC 28 SYMPTOM TABLE for Compressor QR25DE Models or MTC 84 Removal and Installa tion for Compressor VQ35DE Models Revision May 2004 MTC 58 2002 Altima
52. e installed to prevent leakage Y Check air tightness Repair NG OK Note 1 Partial charging appox 200 g 7 05 02 Preliminary refrigerant leak check Refer to PRELIMINARY CHECK 52 Note 1 Complete charging specified amount less partial charge amount Refer to SDS Check for refrigerant leaks Refer to CHECKING PROCEDURE 8 Performance Test Diagnoses 4 Check for A C operation and A C cooling performance Remove service couplers from service valves ____ __ Recover refrigerant in charging hoses 2 Remove service tools Reinstall service valve caps SHA251F 5 MTC 3 Contaminated Refrigerant 1 18 LUBRICANT 3 91 Checking for Refrigerant Leaks 2 91 Checking for Refrigerant 4 59 Performance Chart Leaks Components Refer to MTC 5 Precautions for Refrigerant Connection Revision May 2004 MTC 80 EJS0010H 2002 Altima REFRIGERANT LINES QR25DE Models SEC 214 271 274 276 High pressure service valve 8 Low side 16 High side m Low pressure service valve Refrigerant pressure sensor D Y XEM 9 Compressor M Condenser Liquid tank de Refri
53. e refrigerant connection New type refrigerant connection O ring size WJIA0135E CAUTION The new and former refrigerant connections use different O ring configurations Do not confuse O rings since they are not interchangeable If a wrong O ring is installed refrigerant will leak at or around the connection Revision May 2004 MTC 7 2002 Altima PRECAUTIONS O Ring Part Numbers and Specifications 1 Part number D mnm in W mnm in New 8 92471 N8210 6 8 0 268 1 85 0 0728 Former 10 J2476 89956 9 25 0 3642 1 78 0 0701 New io 92472 N8210 10 9 0 429 2 43 0 0957 Former 92475 71L00 11 0 0 433 2 4 0 094 New 92473 N8210 13 6 0 535 2 43 0 0957 W Former 92475 72L00 14 3 0 563 2 3 0 091 one New 19 92474 8210 16 5 0 650 2 43 0 0957 Always check with the Parts Department for the latest parts information WARNING Make sure all refrigerant is discharged into the recycling equipment and the pressure in the system is less than atmospheric pressure Then gradually loosen the discharge side hose fitting and remove it CAUTION When replacing or cleaning refrigerant cycle components observe the following Revision May 2004 When the compressor is removed store it in the same position as it is when mounted on the car Failure to do so will cause lubricant to enter the low pressure chamber When connecting tubes always use a torque
54. e side will gradually drop after refrigerant circulation stops and pressure on the low pressure side will gradually rise as shown in the graph Some leaks are more easily detected when pressure is high 11 12 13 14 15 16 Pressure r A Pressure in low pressure line Time Compressor Compressor starts stops SHA839E Before connecting ACR4 to vehicle check ACR4 gauges No refrigerant pressure should be displayed If pressure is displayed recover refrigerant from equipment lines and then check refrigerant purity Confirm refrigerant purity in supply tank using ACR4 and refrigerant identifier Confirm refrigerant purity in vehicle system using ACR4 and refrigerant identifier Discharge A C system using approved refrigerant recovery equipment Repair the leaking fitting or com ponent as necessary Evacuate and recharge A C system and perform the leak test to confirm no refrigerant leaks Conduct A C performance test to ensure system works properly Revision May 2004 MTC 94 2002 Altima SERVICE DATA AND SPECIFICATIONS SDS SERVICE DATA AND SPECIFICATIONS SDS PFP 00030 Service Data and Specifications SDS Sec COMPRESSOR Model CALSONIC KANSEI make Type DKS 17D Displacement cm3 cu in rev 175 5 10 7 rev Cylinder bore xstroke 30 5 1 201 x 21 4 0 84 mm in Direction of rotation Clockwise viewed from drive end Drive belt Poly V LUBR
55. e system with the refrigerant Add lubricant to compres sor when replacing any component or after a large refrigerant leakage has occurred It is important to maintain the specified amount If lubricant quantity is not maintained properly the following malfunctions may result e Lack of lubricant May lead to a seized compressor e Excessive lubricant Inadequate cooling thermal exchange interference LUBRICANT Name Nissan A C System Oil Type DH PS Part number 00 50 CHECKING AND ADJUSTING Adjust the lubricant quantity according to the test group shown below 1 LUBRICANT RETURN OPERATION Can lubricant return operation be performed e A C system works properly e There is no evidence of a large amount of lubricant leakage Yes or No Yes gt gt GO TO 2 No gt gt GO TO 3 2 PERFORM LUBRICANT RETURN OPERATION PROCEEDING AS FOLLOWS 1 Start engine and set the following conditions Test condition Engine speed Idling to 1 200 rpm A C switch ON Blower speed Max position Temp control Optional Set so that intake air temperature is 25 to 30 C 77 to 86 F Intake position Recirculation REC 2 Perform lubricant return operation for about 10 minutes 3 Stop engine CAUTION If excessive lubricant leakage is noted do not perform the lubricant return operation gt gt GO TO3 3 CHECK COMPRESSOR Should the compressor be replaced Yes or No Yes GO TO MTC 19 Lubricant Adjustmen
56. er compressor signal R T A C compressor request signal T Blower fan switch signal R QR25DE T Cooling fan motor operation signal R T Cooling fan speed request signal T R Position lights request R T R Position lights status R T Low beam request T R Low beam status R R T High beam request R T R High beam status R R T Front fog lights request T R Front fog light status R T Vehicle speed signal R T Oil pressure switch R T Revision May 2004 MTC 26 2002 Altima AIR CONDITIONER CONTROL Signals ECM SE BCM IPDM E R Sleep request1 R T Sleep request2 T R Seat belt buckle switch signal T R Door switch signal R T R Tail lamp request R T R Turn indicator signal R T Buzzer output signal R T Trunk switch signal R T ASCD main switch signal R ASCD cruise signal R Wiper operation R T Wiper stop position signal R Rear window defogger switch signal T R Rear window defogger control signal R R T Revision May 2004 MTC 27 2002 Altima TROUBLE DIAGNOSIS TROUBLE DIAGNOSIS PFP 00004 How to Perform Trouble Diagnoses for Quick and Accurate Repair WORK FLOW CHECK IN LISTEN TO CUSTOMER COMPLAINT Get detailed information about the conditions and environment when the symptom occurs Verify the symptom with Operational Check 1 Also check related Service bulletins for information Go to appropriate trouble diagnosis Refer to SYMPTOM
57. erant pressure sensor FEATURES OF NEW TYPE REFRIGERANT CONNECTION e O ring has been relocated It has also been provided with a groove for proper installation This elimi nates the chance of the O ring being caught in or damaged by the mating part The sealing direction of the O ring is now set vertically in relation to the contacting surface of the mating part to improve sealing characteristics e The reaction force of the O ring will not occur in the direction that causes the joint to pull out thereby facil itating piping connections Flange portion Union nut portion Former Former Pte Flange O ring O ring CO O ring O ring lt gt Sealed direction 5 815 Revision May 2004 MTC 5 2002 Altima PRECAUTIONS O RING AND REFRIGERANT CONNECTION QR25DE Models Refrigerant pressure sensor Compressor Condenser Liquid tank a Evaporator N pipes OJE valve Evaporator Former type refrigerant connection New type refrigerant connection O ring size WJIA0131E Revision May 2004 MTC 6 2002 Altima PRECAUTIONS VQ35DE Models Refrigerant pressure sensor C t0 Compressor Liquid tank GU Check d o 4 Evaporator pipes Expansion valve Evaporator Former typ
58. et cas 83 57 INSTALLATION 83 58 Removal and Installation for Compressor 58 VQ35DE Models A 84 59 REMOVAL derum 84 INSTALLATION reete 84 59 Removal and Installation for Compressor Clutch 85 63 REMOVAL h etie Wien t 85 63 INSPECTION 86 64 INSTALLATION a aaa 86 64 BREAK IN OPERATION 87 65 Removal and Installation for Low pressure Flexible 65 eler 87 65 REMOVAL eye edere 87 67 INSTALLATION 87 67 Removal and Installation for High pressure flexible 67 toca bie oe ves 88 67 REMOVAL ire macie 88 68 INSTALLATION _ 88 68 Removal and Installation for High pressure Pipe 88 69 REMOVAL 5 tee 88 69 INSTALLATION 88 69 Removal and Installation for Refrigerant Pressure 70 TEE 88 70 Removal and Installation for Condenser 88 71 REMOVAL 88 71 INSTALLATION coset ecoute ette nne ese 89 72 Removal and Installation for Liquid Tank 89 72 Removal and Installation for Evaporator 90 72 eee eret npe exei 90 72 INSTALLATION eee 91 72 Removal and Installation for Expansion Valve 91 73 REMOVAL S us
59. gerant burns e Refrigerant will displace oxygen therefore be certain to work in well ventilated areas to prevent suffocation e Do not pressure test or leak test HFC 134a R 134a service equipment and or vehicle air condi tioning systems with compressed air during repair Some mixtures of air and R 134a have been shown to be combustible at elevated pressures These mixtures if ignited may cause injury or property damage Additional health and safety information may be obtained from refrigerant man ufacturers Precautions for Leak Detection Dye 600026 e The A C system contains a fluorescent leak detection dye used for locating refrigerant leaks An ultraviolet UV lamp is required to illuminate the dye when inspecting for leaks e Always wear fluorescence enhancing UV safety glasses to protect your eyes and enhance the visibility of the fluorescent dye e compressor shaft seal should not be repaired because of dye seepage The compressor shaft seal should only be repaired after confirming the leak with an electronic refrigerant leak detector J 41995 e Always remove any dye from the leak area after repairs are complete to avoid a misdiagnosis during a future service e Do not allow dye to come into contact with painted body panels or interior components If dye is spilled clean immediately with the approved dye cleaner Fluorescent dye left on a surface for an extended period of time cannot be removed Do not spray the fluorescent
60. gerant leak checking order Tightening torque Wrench size O ring size Nm kg m in Ib Nm tt Ib 2 9 5 9 0 29 0 60 26 52 Eq 7 8 19 6 0 8 1 9 69 173 9 8 11 7 1 0 1 1 7 3 8 6 9 5 0 6 47 0 51 0 65 45 57 WJIA0180E Revision May 2004 MTC 81 2002 Altima REFRIGERANT LINES VQ35DE Models SEC 214 271 274 276 High pressure service valve Low side D 0 8 16 High side m Low pressure Refrigerant pressure service 2 Compressor Condenser O Refrigerant leak checking order L Tightening torque Wrench size O ring size Drain hose kg m in Ib Nm kg m ft Ib 2 9 5 9 0 29 0 60 26 52 EJ 7 8 19 6 0 8 1 9 69 173 9 8 11 7 1 0 1 1 7 3 8 6 8 5 0 6 47 0 51 0 65 45 57 0116 Revision May 2004 MTC 82 2002 Altima REFRIGERANT LINES Removal and Installation for Compressor QR25DE Models 4800101 SEC 274 275 Compressor 28 4 33 3 2 9 3 4 21 24 28 4 33 3 2 9 3 4 21 24 28 4 33 3 2 9 3 4 2
61. her refrigerant pressure sensor output voltage Refrigerant pr r nsor 5 Engine front 5 EN harness connector OFF kPa kg cm psi Low pressure side Decreasing to 0 18 0 00184 0 03 High pressure side Increasing to 2 74 0 0279 0 40 Refer to EC 595 REFRIGERANT PRESSURE SENSOR QR25DE models or EC 1266 REFRIGERANT PRESSURE SEN SOR VQ35DE models ae Output voltage V 0 177 1 8 26 2 746 28 398 Refrigerant pressure kPa kg cm psi Gauge pressure SHA315F Revision May 2004 MTC 57 2002 Altima TROUBLE DIAGNOSIS Insufficient Cooling Symptom e Insufficient cooling INSPECTION FLOW 1 4 7 1 Confirm symptom performing the following operational check OPERATIONAL CHECK Temperature decrease 1 Turn temperature control dial to full cold 2 Check for cold air at discharge air outlets 2 Check for any service bulletins 3 Check compressor belt tension Refer to MA 1 Checking Drive NG Adjust or replace compressor belt Belts 4 Check intake door 2 Repair adjust or replace intake door 5 Check cooling fan motor operation Before connecting ACR4 to vehicle check gauges No refrigerant pressure should be displayed If NG recover refrigerant from equipment lines Refer to EC section 3 K Refer to Contaminate
62. hicle A C system using ACR4 and refrigerant identifier If NG refer to MTC 3 Contaminated Refrigerant 4 Discharge refrigerant into the refrigerant recovery recycling equipment Measure lubricant discharged into the recovery recycling equipment 5 Drain the lubricant from the old removed compressor into a graduated container and recover the amount of lubricant drained 6 Drain the lubricant from the new compressor into a separate clean container 7 Measure an amount of new lubricant installed equal to amount drained from old compressor Add this lubricant to new compressor through the suction port opening 8 Measure an amount of new lubricant equal to the amount recovered during discharging Add this lubricant to new compressor through the suction port opening 9 Ifthe liquid tank also needs to be replaced add an additional 5 m 2 0 2 US fl oz 0 2 Imp fl oz of lubricant at this time Do not add this 5 m 0 2 US fl oz 0 2 Imp fl oz of lubricant if only replacing the compressor Revision May 2004 MTC 19 2002 Altima LUBRICANT Lubricant adjusting procedure for compressor replacement Recovery Old New Recycling compressor compressor equipment Record amount Drain lubricant from new compressor into clean container Record amount 1 1 Reinstall Q Y mg of new lubricant Now lubricant New compressor 15 m 0 2 US fl oz
63. ime 2 Press 8787 A1 will be displayed 3 Remove all weight from the scale 4 Press 0 then press Enter 0 00 will be displayed and change to 2 5 Place a known weight dumbbell or similar weight between 4 5 and 36 3 kg 10 and 80 Ib on the center of the weight scale 6 Enter the known weight using four digits Example 10 lbs 10 00 10 5 105 10 50 7 Press Enter the display returns to the vacuum mode 8 Press Shift Reset and Enter at the same time 9 Press 6 the known weight on the scale is displayed 10 Remove the known weight from the scale 0 00 will be displayed 11 Press Shift Reset to return the ACR4 to the program mode CHARGING CYLINDER Using a charging cylinder is not recommended Refrigerant may be vented into air from cylinder s top valve when filling the cylinder with refrigerant Also the accuracy of the cylinder is generally less than that of an electronic scale or of quality recycle recharge equipment Wiring Diagrams and Trouble Diagnosis 800028 When you read wiring diagrams refer to the following Gl 12 How to Read Wiring Diagrams e PG 5 Wiring Diagram POWER When you perform trouble diagnosis refer to the following e GI 9 How to Follow Trouble Diagnoses e Gl 25 How to Perform Efficient Diagnosis for an Electrical Incident Revision May 2004 MTC 11 2002 Altima PREPARATION PREPARATION PFP 00002 Special Service Too
64. ing refrigerant components to a vehicle do not remove the caps unseal until just before connecting the components Connect all refrigerant loop components as quickly as possi ble to minimize the entry of moisture into system Only use the specified lubricant from a sealed container Immediately reseal containers of lubri cant Without proper sealing lubricant will become moisture saturated and should not be used Avoid breathing A C refrigerant and lubricant vapor or mist Exposure may irritate eyes nose and throat Remove R 134a from the A C system using certified service equipment meeting require ments of SAE J2210 R 134a recycling equipment or J2209 R 134a recovery equipment If acci dental system discharge occurs ventilate work area before resuming service Additional health and safety information may be obtained from refrigerant and lubricant manufacturers Do not allow lubricant Nissan A C System Oil Type DH PS to come in contact with styrofoam parts Damage may result Contaminated Refrigerant Sen If a refrigerant other than pure R 134a is identified in a vehicle your options are e Explain to the customer that environmental regulations prohibit the release of contaminated refrigerant into the atmosphere e Explain that recovery of the contaminated refrigerant could damage your service equipment and refriger ant supply e Suggest the customer return the vehicle to the location of previous service where the cont
65. ll maintenance must be per formed by an authorized NISSAN INFINITI dealer e Improper 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 notuse 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 Working with HFC 134a R 134a EJS00023 WARNING e CFC 12 R 12 refrigerant and HFC 134a R 134a refrigerant are not compatible If the refrigerants are mixed compressor failure is likely to occur Refer to MTC 3 Contaminated Refrigerant To determine the purity of HFC 134a R 134a in the vehicle and recovery tank use Refrigerant Recovery Recycling Recharging equipment ACR4 J 39500 NI and Refrigerant Identifier e Use only specified lubricant for the HFC 134a R 134a A C system and HFC 134a R 134a compo nents If lubricant other than that specified is used compressor failure is likely to occur e The specified HFC 134a R 134a lubricant rapidly absorbs moisture from the atmosphere The fol lowing handling precautions must be observed When removing refrigerant components from a vehicle immediately cap seal the component to minimize the entry of moisture from the atmosphere When install
66. ls Semer 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 KV99234330 Installing pulley J 38873 Pulley installer LHA171 KV99233130 Removing pulley J 29884 Pulley puller HFC 134a R 134a Service Tools and Equipment EJS000zD Never mix HFC 134a refrigerant and or its specified lubricant with CFC 12 R 12 refrigerant and or its lubri cant Separate and non interchangeable service equipment must be used for handling each type of refrigerant lubri cant Refrigerant container fittings service hose fittings and service equipment fittings equipment which handles refrigerant and or lubricant are different between CFC 12 R 12 and HFC 134a R 134a This is to avoid mixed use of the refrigerants lubricant Adapters that convert one size fitting to another must never be used refrigerant lubricant contamination will occur and compressor failure will result Tool number Kent Moore No Description Tool name 134 R 134a refrigerant Container color Light blue Container marking HFC 134a R 134a Fitting size Thread size e large container 1 2 16 ACME S NT196 KLH00 PAGS0 Type Poly alkylene glycol oil PAG type DH PS Nissan A C System Oil Type DH 1 2 Application HFC 134a R 134a 5 C rotary compressors Nissan only SZ Lubricity 40 m 1 4 US floz 1 4 Imp 55
67. nal check 3 and check for other symptoms Refer to symptom table 4 Does another symptom exist Another symptom exists EJS000ZW WJIA0166E 91 Checking for Refrigerant 2 MTC 55 DIAGNOSTIC PROCE 3 38 Operational Check Leaks DURE 28 SYMPTOM TABLE 5 14 Checking Drive Belts Revision May 2004 MTC 54 2002 Altima TROUBLE DIAGNOSIS DIAGNOSTIC PROCEDURE SYMPTOM e Magnet clutch does not engage when switch and fan switch are ON 1 CHECK POWER SUPPLY FOR COMPRESSOR Disconnect compressor harness connector Vetage V 4 3 amp Approx A C compressor connector Connector Wire color 5 12V T F3 1 Body ground OK or NG iv OK gt gt GO TO 2 NG gt gt GO TO 3 WJIA0167E 2 CHECK MAGNET CLUTCH COIL Check magnet clutch coil OK or NG OK Check compressor mounting points for looseness or corrosion and repair as necessary NG Replace magnet clutch Refer to MTC 85 Removal and Installation for Compressor Clutch 9 CHECK MAGNET CLUTCH COIL POWER SUPPLY FROM IPDM E R Reconnect compressor harness connector Terminals S Voltage V N WJ Connector Wire color H 124 28 Body ground 12V OK or NG OK gt gt Repai
68. ndication Refrigerant cycle Probable cause Corrective action Low pressure side becomes nega tive Revision May 2004 Liquid tank or front rear side of expansion valve s pipe is frosted or dewed High pressure side is closed and refrigerant does not flow Expansion valve or liquid tank is frosted MTC 62 Leave the system at rest until no frost is present Start it again to check whether or not the problem is caused by water or foreign particles e If water is the cause initially cooling is okay Then the water freezes causing a blockage Drain water from refrigerant or replace refrig erant e If due to foreign particles remove expansion valve and remove the particles with dry and compressed air not shop air e If either of the above meth ods cannot correct the prob lem replace expansion valve e Replace desiccant assy e Check lubricant for contami nation 2002 Altima Insufficient Heating SYM TROUBLE DIAGNOSIS PTOM Insufficient heating INSPECTION FLOW 1 4 7 Revision 2004 63 2002 Altima 1 Confirm symptom by performing the following operational check OPERATIONAL CHECK Temperature increase 1 Start and warm up engine 2 Turn fan control dial to 4 speed 3 Turn A C switch OFF 4 Check for temperature increase a Turn temperature control dial to full hot b Check hot air discharge air outlets 3 Check
69. net coil harness clip using a screwdriver Magnet coil WHA213 e Install the pulley assembly using the installer and a wrench and then install the snap ring using snap ring pliers p ring g pring p KV99234330 Pulley J 38873 assembly LHA174 e Install the clutch disc on the drive shaft together with the original shim s Press the clutch disc down by hand Screwdriver Clutch disc WHA184 Revision May 2004 MTC 86 2002 Altima REFRIGERANT LINES e Using the clutch disc tool to prevent clutch disc rotation tighten the bolt to 12 N m 1 2 kg m 9 ft Ib e After tightening the bolt check that the pulley rotates smoothly Clutch disc holding tool WHA229 e Check clearance all the way around the clutch disc Clutch disc to pulley 0 3 0 6 mm 0 012 0 024 in clearance Clutch disc If the specified clearance is not obtained replace adjusting spacer and readjust a oe 0 3 0 6 0 012 0 024 Unit mm in WHA194 BREAK IN OPERATION When replacing compressor clutch assembly always conduct the break in operation This is done by engag ing and disengaging the clutch about 30 times Break in operation raises the level of transmitted torque Removal and Installation for Low pressure Flexible Hose EJs0010L REMOVAL 1 Discharge the refrigerant Refer to 79 134 R 134a Service Procedure CAUTION Cap or wrap the joint of the pipe with suitable material su
70. not operate normally INSPECTION FLOW 1 Confirm symptom by performing the following operational check OPERATIONAL CHECK Recirculation 1 Press recirculation switch Recirculation indicator should light 2 Listen for intake door position change you should hear blower sound change slightly NOTE Confirm that the RECIRCULATION REC switch is canceled in the DEF H FOOT D F 2 Check for any service bulletins 3 Check intake door motor circuit 1 Yes INSPECTION END If the symptom still exists perform a complete Go to Trouble Diagnosis operational check 2 and check for other for related symptom symptoms Another symptom exists Refer to symptom table 3 Does another symptom exist WJIA0148E 1 46 Intake Door Motor Circuit 2 MTC 38 Operational Check 3 MTC 28 SYMPTOM TABLE Revision May 2004 MTC 46 2002 Altima TROUBLE DIAGNOSIS SYSTEM DESCRIPTON Intake Door Motor The intake door motor is installed on the blower unit Using a link it opens and closes the intake door When RECIRCULATION switch is at REC except DEF and D F modes the A C control unit sets the intake door at the RECIRCU INTAKE poon LATION position 9 AIC CONTROL UNIT 12 Intake door motor DIAGNOSTIC PROCEDURE SYMPTOM Intake door does not change Intake door motor does not operate normally AIC CONTRO
71. ntilation air filter from blower unit 4 Replace with new in cabin microfilter and reinstall on blower unit 5 Reinstall glove box assembly Revision May 2004 MTC 72 PFP 27277 0011 Eresh arr Recirculation air Purified air te vi 7 Blower motor Evaporator gwer moto In cabin microfilter LJIA0012E DIESES FAHRZEUG IST EINEM LUF TUNGSFIL AUSGESTALWELGHER SCHMUT 2 UNDIE LEISTUNG DER KLIMAANLAGE HEIZUNG L F TUNG UND ENTEISUNG DER WINDSCHU f VORKEHRUNGEN FUR LUFTUNGSFILTER NISSAN SCHEN SIE El SIG SUCHEN SIE ZWECKS FILTERAUS TAUSCHEN IHRE VERTRAGSWERKSTATT AUF POLLEN STAUB etc SAMMELT TZSCHEIBE ZU GEWAHRLEISTEN IN SIE DEN FILT ER REGELMASSIG PR CAUTIONS D UTILSATION DU FILTER ANTI POLLEN CEVEHICULE EST EQUIPE D UNFILTER ANTI POLLEN POURLESPOUSSIERES LESETES LE POLLEN AFIND ASSURERLE BON FONCTIONNEMENT DUCINDITIONNEMENT D AIR DU CHAUFFAGE DU ETDE LACEZCI CONTACTEZ VOTRE CONCESSIONNAIRE POUR TOUT REMPLACEMENT 2 TOUS LES 30 000 KM OU T DESEMBUAGE LA VENTILATION REMP E FILTER REGULIEREMENT C j PRECAUTION FOR VENTILATION AIR FILTER THIS VEHICLE IS EQUIPPED WITH A VENTILATION AIR FILTER WHICH COLLECTS DIRT POLLEN DUST elc TO ENSURE A C HEATING DEFROSTING AND VENTILATION PERFORMANCE PLEASE RE LAGE THEFILTER REGULARLY CONIACT YOUR DEALER FOR PART RE
72. ol unit and BCM NG Replace fan switch 8 CHECK COMPRESSOR ON SIGNAL 1 Reconnect A C control unit harness connector 2 With fan switch ON measure voltage between A C control unit and body ground with A C switch OFF and ON A C control unit connector Terminals T Voltage V Condition Approx Connector Wire color V L W A C SW OFF 9V M51 1 Body ground L W A C SW ON OV OK or NG gt gt GOTO9 e NG gt gt Replace A C control unit 9 CHECK COMPRESSOR ON SIGNAL CIRCUIT 1 Disconnect A C control unit harness connector 2 Check continuity between A C control unit and BCM BCM connector Terminals Continuity 2 5 Wire color Connector Wire color Yes A C control unit connector 18 58 L W M51 1 LAN DISCONNECT If OK check harness for short OK or NG OK gt gt GO TO 10 NG gt gt Repair harness or connectors 0170 Revision May 2004 MTC 56 2002 Altima TROUBLE DIAGNOSIS 1 0 CHECK CAN COMMUNICATION CIRCUITS Check CAN communication circuits between BCM to ECM and between ECM to IPDM E R Refer to LAN 3 CAN COMMUNICATION OK or NG OK ECM is malfunctioning NG Repair or replace component based on diagnosis REFRIGERANT PRESSURE SENSOR Make sure that higher A C refrigerant pressure results in hig
73. onent approximately 25 to 50 mm 1 to 2 in sec SHA708EA CHECKING PROCEDURE To prevent inaccurate or false readings make sure there is no refrigerant vapor shop chemicals or cigarette smoke in the vicinity of the vehicle Perform the leak test in calm area low air wind movement so that the leaking refrigerant is not dispersed 1 Turn engine OFF 2 Connecta suitable A C manifold gauge set to the A C service ports 3 Checkifthe A C refrigerant pressure is at least 345 kPa 3 52 kg cm 50 psi above 16 C 61 F If less than specification recover evacuate and recharge the system with the specified amount of refrigerant NOTE At temperatures below 16 C 61 F leaks may not be detected since the system may not reach 345 kPa 3 54 kg cm 50 psi 4 Conduct the leak test from the high side compressor discharge a to evaporator inlet f to the low side evaporator drain hose g to shaft seal k QR25DE models or VQ35DE models Refer to MTC 80 Per form a leak check for the following areas carefully Clean the component to be checked and move the leak detected probe completely around the connection component Compressor Check the fitting of high and low pressure hoses relief valve and shaft seal Liquid tank Check the refrigerant pressure sensor Service valves Check all around the service valves Ensure service valve caps are secured on the service valves to pre vent leaks Revision May 2004 MTC 93 20
74. or packings Replace compressor No temperature difference between high and low pres sure sides MTC Compressor pressure opera tion is improper Damaged inside compressor packings 60 Replace compressor 2002 Altima Both High and Low pressure Sides are Too Low Gauge indication TROUBLE DIAGNOSIS Refrigerant cycle Probable cause Corrective action Both high and low pressure sides are too low e There is a big temperature difference between receiver drier outlet and inlet Outlet temperature is extremely low e Liquid tank inlet and expan sion valve are frosted Liquid tank inside is slightly clogged e Replace desiccant assy e Check lubricant for contami nation e Temperature of expansion valve inlet is extremely low as compared with areas near liquid tank e Expansion valve inlet may be frosted e Temperature difference occurs somewhere in high pressure side High pressure pipe located between receiver drier and expansion valve is clogged e Check and repair malfunc tioning parts e Check lubricant for contami nation Expansion valve and liquid tank are warm or only cool when touched Low refrigerant charge Leaking fittings or components Check refrigerant for leaks Refer to MTC 91 Checking for Refrigerant Leaks There is a big temperature dif ference between expansion valve inlet and outlet while the valve itself i
75. or motor connector Body ground Yes Continuity should exist If OK check harness for short OK or NG OK GO TO 2 NG Repair harness or connector 0208 Revision 2004 43 2002 Altima TROUBLE DIAGNOSIS 2 CHECK CIRCUIT CONTINUITY BETWEEN EACH TERMINAL ON CONTROL UNIT AND ON MODE DOOR MOTOR ___ DISCONNECT N Terminals Continuity 5 Connectors Wire colors Connectors Wire colors Mods door motot mm 51 9 L B M40 3 L B Yes connector M51 12 L R 40 1 L R i 3 Continuity should exist If OK check harness for short WJIA0209E OK or NG OK gt gt GO 3 NG gt gt Repair harness or connector 3 CHECK FOR CONTROL UNIT 1 Reconnect mode door motor connector 2 Measure voltage across A C control unit harness connector M51 terminals 9 L B and 12 L R while turning air control dial to each position Voltage V Approx 12V OK or NG OK gt gt Replace mode door motor NG gt gt Replace A C control unit 0210 MODE DOOR 1 Install mode door motor on heater unit Ensure that the linkage is properly attached 2 Connect mode door motor harness connector Turn ignition switch ON 4 Check that the mode door operates properly when air control dial is turned to each position WJIA0200E Revision May 2004 MTC 44 2002 Altima TROUBLE DIAGNOSIS Air Mix Door Seen S
76. oval and Installation BE REMOVAL 1 Remove the glove box assembly Refer to 15 Glove 2 Remove the ECM 3 Disconnect the blower motor intake door motor and fan control amp connector 4 Remove the 2 bolts and 1 screw from the blower unit then remove it WJIA0101E Revision May 2004 MTC 69 2002 Altima BLOWER MOTOR BLOWER MOTOR PFP 27226 Removal and Installation e 1 Remove the blower unit Refer to MTC 69 Removal and Installation 2 Release the 8 tabs attaching blower motor to blower unit case and then remove it 0104 Revision May 2004 MTC 70 2002 Altima INTAKE DOOR MOTOR INTAKE DOOR MOTOR PFP 27730 Removal and Installation Soe 1 Remove the blower unit Refer to MTC 69 Removal and Installation 2 Remove the screws and then the intake door motor from the blower unit WJIA0105E Revision May 2004 MTC 71 2002 Altima IN CABIN MICROFILTER IN CABIN MICROFILTER Removal and Installation FUNCTION Air inside passenger compartment is kept clean at either recircula tion or fresh mode by installing in cabin microfilter into blower unit REPLACEMENT TIMING Replace in cabin microfilter Refer to MA 7 SCHEDULE 1 and MA 10 SCHEDULE 2 Caution label is fixed inside the glove box REPLACEMENT PROCEDURES 1 Remove glove box assembly Refer to Remove in cabin microfilter cover IP 15 Glove Box 2 3 Take out the ve
77. oval and Installation for High pressure Pipe EJS0010N REMOVAL 1 Discharge the refrigerant Refer to MTC 79 134 R 134a Service Procedure 2 Remove the high pressure pipe Refer to MTC 80 Components CAUTION Cap or wrap the joint of the pipe with suitable material such as vinyl tape to avoid the entry of air INSTALLATION the O ring of the high pressure pipe with a new one then apply compressor oil to it when installing it e When charging refrigerant check for leaks Bolt mounting the high pressure pipe evaporator side Tightening torque 2 9 5 9 N m 0 29 0 60 kg m 26 52 in Ib Bolt mounting the high pressure pipe condenser side Tightening torque 7 8 19 6 N m 0 8 1 9 kg m 69 173 in Ib Removal and Installation for Refrigerant Pressure Sensor 2777 1 Discharge the refrigerant Refer to MTC 79 134 R 134a Service Procedure 2 Disconnect the refrigerant pressure sensor connector and remove the refrigerant pressure sensor from condenser radiator removed CAUTION e Please be careful not to damage the condenser fins e Apply compressor oil to the O ring of the refrigerant pres sure sensor when installing it Tightening 9 8 11 7 N m 1 0 1 2 kg m 7 3 8 6 ft torque Ib Removal and Installation for Condenser REMOVAL 1 Discharge the refrigerant Refer to MTC 79 134 R 134a Service Procedure 2 Remove the radiator Refer to CO
78. r charging system with dye 2002 Altima PREPARATION Tool number Kent Moore No Description Tool name J 41459 For injecting 1 4 ounce of fluorescent HFC 134a R 134a Dye injector Use with J 41447 1 4 ounce bottle SHA440F leak detection dye into A C system J 43872 For cleaning dye spills Dye cleaner SHA441F J 39183 C Identification Manifold gauge set with hoses and couplers 0196 e The gauge face indicates R 134a Fitting size Thread size e 1 2 16 ACME Service hoses e High side hose J 39500 72B e Low side hose J 39500 72R e Utility hose J 39500 72Y Q S NT201 Hose color e Low side hose Blue with black stripe e High side hose Red with black stripe e Utility hose Yellow with black stripe or green with black stripe Hose fitting to gauge e 1 2 16 ACME Service couplers e High side coupler J 39500 20A e Low side coupler J 39500 24A S NT202 Hose fitting to service hose e M14 x 1 5 fitting is optional or perma nently attached J 39699 Refrigerant weight scale S NT200 For measuring of refrigerant Fitting size Thread size e 1 2 16 ACME J 39649 Vacuum pump Including the isolator valve Revision May 2004 Capacity e Air displacement 4 CFM e Micron rating 20 microns e Oil capacity 482 g 17 oz Fitting size Thread size e 1 2 16 ACME 2002 Altima Commercial Servi
79. r harness or connector between IPDM E R and compressor NG gt gt GO TO 4 WJIA0065E 4 CHECK INTAKE SENSOR CIRCUIT Refer to MTC 65 Intake Sensor Circuit OK or NG OK gt gt GO TO 5 NG gt gt Repair as necessary 5 CHECK REFRIGERANT PRESSURE SENSOR Refer to 595 REFRIGERANT PRESSURE SENSOR QR25DE models or 1266 REFRIGERANT PRESSURE SENSOR VQ35DE models OK or NG OK GO TO 6 NG Repair as necessary Revision May 2004 MTC 55 2002 Altima TROUBLE DIAGNOSIS CHECK FAN SIGNAL CONTROL UNIT 1 Disconnect A C control unit harness connector M51 2 Measure voltage between A C control unit and body ground 3 Reconnect control unit harness connector M51 and disconnect BCM harness connector M18 4 Measure voltage between BCM and body ground BOM connector Terminals e A DISCONNECT O Condition Voltage V A C control unit connector Approx HETT Connectors Wire colors 5 N G B FAN SW OFF 51 5 G B FAN SW ON ov Body ground G B FAN SW OFF 18 65 G B FAN SW ON ov WJIA0211E OK or NG OK gt gt GO TO 8 NG gt gt GO TO 7 7 CHECK FAN SWITCH Check fan switch Refer to MTC 53 Fan Switch OK or NG OK Repair harness or connectors between fan switch and A C contr
80. re Increase 1 Turn temperature control dial to full hot 2 Check for hot air at discharge air outlets If NG go to MTC 63 Insufficient Heating If OK continue with next check WJIA0143E 6 Check Air Conditioner Switch Turn fan control dial to the desired 1 to 4 speed position and push the air conditioner switch if equipped to turn ON the air conditioner The indicator light should come on when air conditioner is ON If NG go to MTC 40 A C System If all operational checks are OK symptom can not be duplicated go to Incident Simulation Tests 01 25 and perform tests as outlined to simulate driving conditions environment If symptom appears refer to MTC 28 SYMPTOM TABLE and perform applicable trou ble diagnosis procedures 0144 Revision 2004 39 2002 Altima TROUBLE DIAGNOSIS A C System 500025 SYMPTOM e system does not come on INSPECTION FLOW 1 Confirm symptom by performing Operational Check Step 6 1 If OK symptom cannot be duplicated perform complete Operational Check 2 If NG symptom is confirmed continue with STEP 2 below 2 Check for any service bulletins 3 Check Main Power Supply and Ground Circuit 3 Replace A C control unit 0145 1 39 6 Check Air Conditioner 2 38 Operational Check 40 DIAGNOSTIC 3 DURE DIAGNOSTIC PROCEDURE SY
81. s Yrs s JP m D be Y 21 L 267 x L 9 D IPDM E R A C relay WJIA0136E Revision May 2004 MTC 29 2002 Altima TROUBLE DIAGNOSIS VQ35DE Models sss n mu IPDM E R A C relay D Refrigerant pressure sensor compressor WJIA0137E Revision May 2004 MTC 30 2002 Altima TROUBLE DIAGNOSIS PASSENGER COMPARTMENT Intake sensor Blower motor resistor Mes Blower motor Mode door motor Mode door motor E Intake sensor w Intake door motor c S A 1 one 4 7 t 1 13 E Blower motor A C control unit us D Blower motor resistor Fan switch 0138 Revision 2004 31 2002 Altima TROUBLE DIAGNOSIS Revision May 2004 MTC 32 Circuit Diagram EJS000zO 2 WITH QR25DE 10 113 va W
82. s frosted Expansion valve closes a little compared with the specifica tion 1 expansion valve adjustment 2 Malfunctioning thermal valve 3 Outlet and inlet may be clogged e Remove foreign particles by using compressed air e Check lubricant for contami nation An area of the low pressure pipe is colder than areas near the evaporator outlet Low pressure pipe is clogged or crushed MTC e Check and repair malfunc tioning parts e Check lubricant for contami nation Air flow volume is not enough or is too low Evaporator is frozen Low pressure Side Sometimes Becomes Negative Gauge indication Refrigerant cycle Probable cause e Check intake sensor opera tion Refer to MTC 68 INTAKE SENSOR e Replace compressor Corrective action Low pressure side sometimes becomes negative Revision May 2004 e Air conditioning system does not function and does not cyclically cool the com partment air e The system constantly func tions for a certain period of time after compressor is stopped and restarted Refrigerant does not dis charge cyclically Moisture is frozen at expan sion valve outlet and inlet Water is mixed with refriger ant MTC 61 e Drain water from refrigerant or replace refrigerant e Replace desiccant assy 2002 Altima TROUBLE DIAGNOSIS Low pressure Side Becomes Negative Gauge i
83. s status Low beam request Low beam status High beam request High beam status Front fog lights request Front fog light status 24242 2 OD cancel switch signal Dia Di 23023 2303 A 2 X Brake switch signal Vehicle speed signal Oil pressure switch Sleep request1 v a 4 4 Sleep request2 N range switch signal P range switch signal Seat belt buckle switch signal Door switch signal Revision May 2004 MTC 25 va a 2002 Altima Signals AIR CONDITIONER CONTROL ECM TCM COMBINATION METER BCM IPDM E R Tail lamp request R R Turn indicator signal Buzzer output signal Trunk switch signal Al ASCD main switch signal ASCD cruise signal D Wiper operation Wiper stop position signal Rear window defogger switch signal Rear window defogger control signal FOR WT MODELS System diagram Input output signal chart o a o D 4 20 1 COMBINATION METER DATA LINK CONNECTOR IPDM E R 0018 Transmit R Receive Signals ECM aa BCM IPDM E R Engine speed signal T Engine coolant temperature signal T Fuel consumption monitor signal T Air conditioner switch signal R T Air condition
84. so protected by a pressure relief valve located in the rear head of the compressor When the pressure of refrigerant in the system increases to an abnormal level more than 3 727 kPa 38 kg cm 540 psi the release port on the pressure relief valve automatically opens and releases refrigerant into the atmosphere SE Pressure relief valve 17772 High pressure NSN Low pressure gas liquid High pressure Low pressure liqui Compressor EN gas Outside air SSS SSS SSSSSSSSSSSSSSSSSSSSSESSS N N N N N N 2 1 1 EE 12222 s zzzz Condenser Refrigerant LIIIITIIIIZI With liquid tank pressure sensor Blower motor Expansion valve 1 0015 Revision May 2004 MTC 16 2002 Altima REFRIGERATION SYSTEM Component Layout SEC 270 271 272 273 EJS000ZG Defroster nozzle Ventilator duct Heater and ij Blower unit cooling unit Early production duct When Floor duct When a T removing floor duct removing floor duct For removal iis necessary it is necessary to remove carpet itis necessary to remove carpet to remove instrument panel WJIA0287E Revision May 2004 MTC 17 2002 Altima LUBRICANT LUBRICANT PFP KLG00 Maintenance of Lubricant Quantity in Compressor Genen The lubricant in the compressor circulates through th
85. specified lubricant 1 2 BHAB3SD SERVICE HOSES Be certain that the service hoses display the markings described Hose fittings to colored hose with black stripe All hoses must include positive shut ES off devices either manual or automatic near the end of the hoses opposite the manifold gauge M14 x 1 5 fitting optional Hose may be permanently attached to coupler RHA272D Revision May 2004 MTC 10 2002 Altima PRECAUTIONS SERVICE COUPLERS Never attempt to connect HFC 134a R 134a service couplers to a CFC 12 R 12 A C system The HFC 134a R 134a couplers will not properly connect to the CFC 12 R 12 system However if an De improper connection is attempted discharging and contamination may occur M14 x 1 5 fitting optional Shut off valve rotation A C service valve i Hose may be permanently Clockwise Open attached to Counterclockwise Close REFRIGERANT WEIGHT SCALE Verify that no refrigerant other than HFC 134a R 134a and speci fied lubricants have been used with the scale If the scale controls Refrigerant container refrigerant flow electronically the hose fitting must be 1 2 16 134 fittings 1 2 16ACME To manifold gauge Weight scale RHA274D CALIBRATING 4 WEIGHT SCALE Calibrate the scale every three months To calibrate the weight scale on the 4 J 39500 NI 1 Press Shift Reset and Enter at the same t
86. t Procedure for Compressor Replacement No gt gt GO TO 4 4 CHECK ANY PART Is there any part to be replaced Evaporator condenser liquid tank or in case there is evidence of a large amount of lubricant leakage Yes or No Yes GO TO MTC 19 Lubricant Adjusting Procedure for Component Replacement Except Compres Sor No gt gt Carry out the A C performance test Revision May 2004 MTC 18 2002 Altima LUBRICANT Lubricant Adjusting Procedure for Component Replacement Except Compressor After replacing any of the following major components add the correct amount of lubricant to the system Amount of lubricant to be added Lubricant to be added to system Part replaced Remarks Amount ol lubricant m US fl oz Imp fl oz Evaporator 75 2 5 2 6 Condenser 75 2 5 2 6 Liquid tank 5 0 2 0 2 Add if compressor is not replaced 30 1 0 1 1 Large leak In case of refrigerant leak Small leak 1 e 71 If refrigerant leak is small no addition of lubricant is needed Lubricant Adjustment Procedure for Compressor Replacement 1 Before connecting ACR4 to vehicle check ACR4 gauges No refrigerant pressure should be displayed If OK recover refrigerant from equipment lines 2 Confirm refrigerant purity in supply tank using ACR4 and refrigerant identifier If NG refer to MTC 3 Con taminated Refrigerant 3 Connect ACR4 to vehicle Confirm refrigerant purity in ve
87. u Ra ai ens 91 73 INSTAELATION cre rettet E 91 73 Checking for Refrigerant Leaks 91 73 Checking System for Leaks Using the Fluorescent 74 Leak Detector 42224 42 92 74 Dye InJeGtion uote epe dex 92 75 Electronic Refrigerant Leak Detector 92 75 PRECAUTIONS FOR HANDLING LEAK 75 DETEGTOR S a n Attn aa Ones 92 76 CHECKING PROCEDURE 93 76 SERVICE DATA AND SPECIFICATIONS SDS 95 77 Service Data and Specifications SDS 95 77 COMPRESSOR 95 LUBRICANT tte 95 77 REFRIGERANT 95 77 ENGINE IDLING SPEED 95 77 BELT TENSION sess 95 78 78 MTC 2 2002 Altima PRECAUTIONS PRECAUTIONS PFP 00001 Precautions for Supplemental Restraint System SRS AIR BAG and SEAT BELT PRE TENSIONER Sne 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 Information necessary to service the system safely is included in the SRS and SB section of this Service Manual 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 a
88. will appear as a bright green yellow area at the point of leakage Fluorescent dye observed at the evaporator drain opening indi cates an evaporator core assembly tubes core or TXV leak 2 If the suspected area is difficult to see use an adjustable mirror or wipe the area with a clean shop rag or cloth with the UV lamp for dye residue 3 Afterthe leak is repaired remove any residual dye using dye cleaner J 43872 to prevent future misdiag nosis 4 Perform a system performance check and verify the leak repair with an approved electronic refrigerant leak detector NOTE Other gases in the work area or substances on the A C components for example anti freeze windshield washer fluid solvents and lubricants may falsely trigger the leak detector Make sure the surfaces to be checked are clean Clean with a dry cloth or blow off with shop air Do not allow the sensor tip of the detector to contact with any substance This can also cause false readings and may damage the detector Dye Injection EJs0010V This procedure is only necessary when recharging the system or when the compressor has seized and was replaced 1 Check A C system static at rest pressure Pressure must be at least 345 kPa 50 psi Pour one bottle 1 4 ounce 7 4 cc of the A C refrigerant dye into the injector tool J 41459 Connect the injector tool to the A C LOW PRESSURE side service fitting Start engine and switch A C ON When the A C operating
89. xternal snap ring pliers e Pulley removal REFRIGERANT LINES Compressor Clutch EJS0010K Clutch disc holding tool WHA228 External snap ring pliers Snap ring 072 puller Pulley assembly LHA173 Screwdriver Magnet coil WHA212 Use a pulley puller with small adapter Position the small adapter on the end of the drive shaft and the center of the puller on the small adapter Remove the pulley assembly with the puller To prevent deformation of the pulley groove the puller claws should be hooked under not into the pulley groove Remove the snap ring using external snap ring pliers Remove the magnet coil harness clip using a screwdriver remove the three magnet coil fixing screws and remove the magnet coil Revision May 2004 MTC 85 2002 Altima REFRIGERANT LINES INSPECTION Snap ring Clutch Disc E D WHA183 If the contact surface shows signs of damage due to excessive heat replace clutch disc and pulley Pulley Check the appearance of the pulley assembly If contact surface of pulley shows signs of excessive grooving replace clutch disc and pulley The contact surfaces of the pulley assembly should be cleaned with a suitable solvent before reinstallation Coil Check magnet coil for loose connection or cracked insulation INSTALLATION e Install the magnet coil Be sure to align the magnet coil pin with the hole in the compressor front head e Install the mag

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