2006 INFINITI M35 clutch

ATC-58
TROUBLE DIAGNOSIS
Revision: 2006 January2006 M35/M45
Checks must be made visually, by listening the sound, or by touching air outlets with hand, etc. for improper
operation.
*1: FOOT position during automatic control. Refer to AT C - 6 3 , "
AUXILIARY MECHANISM: FOOT POSITION
SETTING TRIMMER" .
OK or NG
OK >> GO TO 8.
NG >>
Air outlet does not change.
Go to Mode Door Motor Circuit. Refer to AT C - 7 5 , "
Mode Door Motor Circuit" .
Upper ventilator outlet does not change.
Go to Upper Ventilator Door Motor Circuit. Refer to AT C - 8 0 , "
Upper Ventilator Door Motor Cir-
cuit" .
Intake door does not change.
Go to Intake Door Motor Circuit. Refer to AT C - 8 6 , "
Intake Door Motor Circuit" .
Blower motor operation is malfunctioning.
Go to Blower Motor Circuit. Refer to AT C - 8 9 , "
Blower Motor Circuit" .
Magnet clutch does not engage.
Go to Magnet Clutch Circuit. Refer to ATC-94, "
Magnet Clutch Circuit" .
Discharge air temperature does not change.
Go to Air Mix Door Motor Circuit. Refer to AT C - 8 3 , "
Air Mix Door Motor Circuit" .
8. STEP-5: TEMPERATURE OF EACH SENSOR IS CHECKED
1. Press temperature control (UP) switch (driver side).
2. Code No. 51 appears on the display.
>> GO TO 9.
9. CHECK AMBIENT SENSOR
Press (DEF) switch one time. Temperature detected by ambient
sensor is indicated on the display.
NOTE:
If the temperature indicated on the display greatly differs from the
actual temperature, check sensor circuit first, and then check sensor.
OK or NG
OK >> GO TO 10.
NG >> Go to Ambient Sensor Circuit. Refer to AT C - 11 3 , "
Ambi-
ent Sensor Circuit" .
10. CHECK IN-VEHICLE SENSOR
Press (DEF) switch for the second time. Temperature detected
by in-vehicle sensor is indicated on the display.
NOTE:
If the temperature indicated on the display greatly differs from the
actual temperature, check sensor circuit first, and then check sensor.
OK or NG
OK >> GO TO 11.
NG >> Go to In-vehicle Sensor Circuit. Refer to AT C - 11 6 , "
In-
Vehicle Sensor Circuit" .
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RJIA1271E

ATC-64
TROUBLE DIAGNOSIS
Revision: 2006 January2006 M35/M45
Operational CheckNJS000GK
The purpose of the operational check is to check if the individual system operates properly.
CHECKING MEMORY FUNCTION
1. Press the temperature control (UP) switch (driver side) until 32C (90F) is displayed.
2. Press OFF switch.
3. Turn ignition switch OFF.
4. Turn ignition switch ON.
5. Press the AUTO switch.
6. Confirm that the set temperature remains at previous temperature.
7. Press OFF switch.
If NG, go to trouble diagnosis procedure for ATC-112, "
Memory Function" .
If OK, continue the check.
CHECKING BLOWER
1. Press fan (UP:+) switch. Blower should operate on low speed. The fan symbol should have one blade lit.
2. Press fan (UP:+) switch again, and continue checking blower speed and fan symbol until all speeds are
checked.
3. Leave blower on max. speed.
If NG, go to trouble diagnosis procedure for ATC-89, "
Blower Motor Circuit" .
If OK, continue the check.
CHECKING DISCHARGE AIR (MODE SWITCH AND DEF SWITCH)
1. Press MODE switch and DEF switch.
2. Each position indicator should change shape.
3. Confirm that discharge air comes out according to the air distribution table. Refer to AT C - 3 7 , "
Discharge
Air Flow" .
If NG, go to trouble diagnosis procedure for ATC-75, "
Mode Door Motor Circuit" .
If OK, continue the check.
NOTE:
Confirm that the compressor clutch is engaged (sound or visual inspection) and intake door position is at
FRESH when the D/F or DEF is selected.Conditions : Engine running at normal operating temperature
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TROUBLE DIAGNOSIS
ATC-65
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Revision: 2006 January2006 M35/M45
CHECKING DISCHARGE AIR (UPPER VENT SWITCH)
1. Press temperature control (DOWN) switch (driver side) until 18C (60F) is displayed.
2. Press fan (UP:+) switch until Max. speed.
3. Set MODE switch (driver side) to VENT position.
4. Press UPPER VENT switch.
AUTO indicator should illuminate.
5. Press temperature control (UP) switch (driver side) until 32
C (90F) is displayed.
6. Conform that discharger come out.
7. Press UPPER VENT switch again.
AUTO indicator should OFF.
If NG, go to trouble diagnosis procedure for ATC-80, "
Upper Ventilator Door Motor Circuit" .
If OK, continue the check.
CHECKING INTAKE AIR
1. Press intake switch. Recirculation indicator should illuminate.
2. Press intake switch again. Fresh indicator should illuminate.
3. Listen for intake door position change. (Slight change of blower sound can be heard.)
If NG, go to trouble diagnosis procedure for ATC-86, "
Intake Door Motor Circuit" .
If OK, continue the check.
NOTE:
Confirm that the compressor clutch is engaged (sound or visual inspection) and intake door position is at
FRESH when the D/F or DEF is selected.
CHECKING TEMPERATURE DECREASE
1. Press temperature control (DOWN) switch (driver side) until 18C (60F) is displayed.
2. Check for cold air at discharge air outlets.
If NG, go to trouble diagnosis procedure for ATC-99, "
Insufficient Cooling" .
If OK, continue the check.
CHECKING TEMPERATURE INCREASE
1. Press temperature control (UP) switch (driver side) until 32C (90F) is displayed.
2. Check for hot air at discharge air outlets.
If NG, go to trouble diagnosis procedure for ATC-109, "
Insufficient Heating" .
If OK, continue the check.
CHECKING A/C SWITCH
1. Press AUTO switch and A/C switch.
2. A/C switch indicator will turn ON.
Confirm that the compressor clutch engages (sound or visual inspection).
CHECKING AUTO MODE
1. Press AUTO switch and A/C switch.
2. Display should indicate AUTO.
Discharge air and blower speed will depend on ambient, in-vehicle, and set temperatures.
If NG, go to trouble diagnosis procedure for AT C - 6 6 , "
Power Supply and Ground Circuit for Auto Amp." , then
if necessary, trouble diagnosis procedure for AT C - 9 4 , "
Magnet Clutch Circuit" .
If all operational checks are OK (symptom cannot be duplicated), go to Incident Simulation Tests in GI-28,
"How to Perform Efficient Diagnosis for an Electrical Incident" and perform tests as outlined to simulate driv-
ing conditions environment. If symptom appears, refer to AT C - 4 1 , "
SYMPTOM TABLE" and perform applica-
ble trouble diagnosis procedures.

ATC-94
TROUBLE DIAGNOSIS
Revision: 2006 January2006 M35/M45
Magnet Clutch CircuitNJS000GU
SYMPTOM: Magnet clutch does not engage.
INSPECTION FLOW
*1ATC-122, "Intake Sensor Circuit"*2ATC-113, "Ambient Sensor Circuit"*3AT C - 5 6 , "FUNCTION CONFIRMA-
TION PROCEDURE", see No. 13.
*4ATC-95, "
DIAGNOSIS PROCE-
DURE FOR MAGNET CLUTCH"
*5ATC-105, "TROUBLE DIAGNOSIS
FOR UNUSUAL PRESSURE"
*6AT C - 6 4 , "Operational Check"
*7ATC-56, "FUNCTION CONFIRMA-
TION PROCEDURE", see No. 2 to 6.*8ATC-41, "
SYMPTOM TABLE"
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TROUBLE DIAGNOSIS
ATC-95
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Revision: 2006 January2006 M35/M45
SYSTEM DESCRIPTION
Unified meter and A/C amp. controls compressor operation by ambient temperature, intake air temperature
and signal from ECM.
Low Temperature Protection Control
Unified meter and A/C amp. will turn compressor ON or OFF as determined by a signal detected by ambient
sensor and intake sensor.
When ambient temperature is higher than
2C (28F), the compres-
sor turns ON. The compressor turns OFF when ambient temperature
is lower than
5C (23F).
When intake air temperature is higher than 1
C (34F), the compres-
sor turns ON. The compressor turns OFF when intake air tempera-
ture is lower than
5C (23F).
DIAGNOSIS PROCEDURE FOR MAGNET CLUTCH
SYMPTOM: Magnet clutch does not engage when A/C switch is ON.
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RJIA4078E

ATC-96
TROUBLE DIAGNOSIS
Revision: 2006 January2006 M35/M45
1. CHECK AMBIENT SENSOR AND INTAKE SENSOR CIRCUIT
Check ambient sensor and intake sensor. Refer to AT C - 5 6 , "
FUNCTION CONFIRMATION PROCEDURE" ,
see No. 9 and 11.
OK or NG
OK >> GO TO 2.
NG >>
Malfunctioning ambient sensor: Refer to AT C - 11 3 , "Ambient Sensor Circuit" .
Malfunctioning intake sensor: Refer to ATC-122, "Intake Sensor Circuit" .
2. PERFORM AUTO ACTIVE TEST
Refer to PG-24, "
Auto Active Test" .
Does the magnet clutch operate?
YES >>WITH CONSULT-II: GO TO 5.
WITHOUT CONSULT-II: GO TO 6.
NO >> Check 10A fuse (No. 79, located in IPDM E/R), and GO TO 3.
3. CHECK CIRCUIT CONTINUITY BETWEEN IPDM E/R AND COMPRESSOR
1. Turn ignition switch OFF.
2. Disconnect IPDM E/R connector and compressor connector.
3. Check continuity between IPDM E/R harness connector E8 ter-
minal 34 and compressor harness connector F24 terminal 1.
OK or NG
OK >> GO TO 4.
NG >> Repair harness or connector.
4. CHECK MAGNET CLUTCH CIRCUIT
Check for operation sound when applying battery voltage direct cur-
rent to terminal.
OK or NG
OK >> 1. Replace IPDM E/R.
2. Go to self-diagnosis procedure AT C - 5 6 , "
FUNCTION
CONFIRMATION PROCEDURE" and perform self-
diagnosis STEP-4. Confirm that magnet clutch opera-
tion normal.
NG >> 1. Replace compressor.
2. Go to self-diagnosis procedure AT C - 5 6 , "
FUNCTION
CONFIRMATION PROCEDURE" and perform self-
diagnosis STEP-4. Confirm that magnet clutch operation normal.
34 – 1 : Continuity should exist.
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RJIA2005E

ATC-100
TROUBLE DIAGNOSIS
Revision: 2006 January2006 M35/M45
*1ATC-56, "FUNCTION CONFIRMA-
TION PROCEDURE", see No. 2 to 6.*2ATC-83, "
Air Mix Door Motor Circuit"*3ATC-103, "Test Reading
(VQ35DE)" or ATC-104, "Test
Reading (VK45DE)"
*4ATC-62, "AUXILIARY MECHA-
NISM: TEMPERATURE SETTING
TRIMMER"
*5ATC-56, "FUNCTION CONFIRMA-
TION PROCEDURE", see No. 13.*6ATC-70, "
LAN System Circuit"
*7ATC-89, "Blower Motor Circuit"*8ATC-94, "Magnet Clutch Circuit"*9ATC-101, "PERFORMANCE TEST
DIAGNOSIS"
*10ATC-64, "Operational Check"*11AT C - 7 , "CONTAMINATED REFRIG-
ERANT"
*12EM-15, "Checking Drive Belts"
(VQ35DE) or EM-174, "
Checking
Drive Belts" (VK45DE)
*13EC-512, "
SYSTEM DESCRIPTION"
(VQ35DE) or EC-1239, "
SYSTEM
DESCRIPTION" (VK45DE)

REFRIGERANT LINES
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Revision: 2006 January2006 M35/M45
Removal and Installation of CompressorNJS000HO
REMOVAL
VQ35DE
1. Use a refrigerant collecting equipment (for HFC-134a) to discharge the refrigerant.
2. Remove air cleaner case and air duct. Refer to EM-17, "
AIR CLEANER AND AIR DUCT" .
3. Remove engine undercover, using power tools.
4. Remove mounting nuts from low-pressure flexible hose and
high-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.
5. Disconnect compressor (magnet clutch and ECV) connectors.
6. Remove A/C compressor belt. Refer to EM-15, "
DRIVE BELTS" .
7. Remove mounting bolts, and then remove damper bracket.
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