2008 NISSAN LATIO Service Repair Manual

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Page 2369 of 2771

NISSAN LATIO 2008 Service Repair Manual TROUBLE DIAGNOSIS
MTC-31
< SERVICE INFORMATION >
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1. Turn blower control dial clockwise to "1" position. Blower should operate on low speed.
2. Turn blower cont

TROUBLE DIAGNOSIS
MTC-31
< SERVICE INFORMATION >
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1. Turn blower control dial clockwise to "1" position. Blower should operate on low speed.
2. Turn blower control dial clockwise to "2" position, and continue checking blower speed until all speeds are
checked.
3. Leave blower on Maximum speed.
If NG, go to trouble diagnosis procedure for MTC-33, "
Front Blower Motor Circuit".
If OK, continue the check.
CHECKING DISCHARGE AIR
1. Turn mode door control dial to each position.
2. Confirm that discharge air comes out according to the air distribution table. Refer to MTC-20, "
Discharge
Air Flow".
If NG, go to trouble diagnosis procedure for MTC-31, "
Mode Door".
If OK, continue the check.
CHECKING RECIRCULATION
1. Set intake door lever to REC position.
2. Operate intake door lever to FRE position.
3. Listen for intake door position change (you should hear blower sound change slightly).
If NG, go to trouble diagnosis procedure for MTC-33, "
Intake Door".
If OK, continue the check.
CHECKING TEMPERATURE DECREASE
1. Turn temperature control dial counterclockwise to full cold position.
2. Check for cold air at discharge air outlets.
If NG, go to trouble diagnosis procedure for MTC-45, "
Insufficient Cooling".
If OK, continue the check.
CHECKING TEMPERATURE INCREASE
1. Turn temperature control dial clockwise to full hot position.
2. Check for hot air at discharge air outlets.
If NG, go to trouble diagnosis procedure for MTC-52, "
Insufficient Heating".
If OK, continue the check.
CHECKING A/C SWITCH (IF EQUIPPED)
1. Turn fan control dial to the desired (1 to 4 speed) position.
2. Press A/C switch.
3. A/C switch indicator will turn ON.
• Confirm that the compressor clutch engages (sound or visual inspection).
If NG, go to trouble diagnosis procedure for MTC-37, "
Magnet Clutch Circuit (If Equipped)".
If OK, continue the check.
CHECKING DEFROST A/C SWITCH (IF EQUIPPED)
1. Turn fan control dial to the desired (1 to 4 speed) position.
2. Turn mode dial to ( ) DEF.
3. Confirm that the compressor clutch engages (sound or visual inspection) and the A/C switch indicator illu-
minates.
If NG, go to trouble diagnosis procedure for MTC-37, "
Magnet Clutch Circuit (If Equipped)".
If all operational checks are OK (symptom cannot be duplicated), go to MTC-22, "
How to Perform Trouble
Diagnosis for Quick and Accurate Repair" and perform tests as outlined. If symptom appears, refer to MTC-22,
"How to Perform Trouble Diagnosis for Quick and Accurate Repair" and perform applicable trouble diagnosis
procedures.
Mode DoorINFOID:0000000001704301
SYMPTOM: Air outlet does not change.
INSPECTION FLOW

Page 2370 of 2771

NISSAN LATIO 2008 Service Repair Manual MTC-32
< SERVICE INFORMATION >
TROUBLE DIAGNOSIS
1.CONFIRM SYMPTOM BY PERFORMING OPERATIONAL CHECK - DISCHARGE AIR
1. Rotate the mode door control dial to each position.
2. Confirm that discharge air

MTC-32
< SERVICE INFORMATION >
TROUBLE DIAGNOSIS
1.CONFIRM SYMPTOM BY PERFORMING OPERATIONAL CHECK - DISCHARGE AIR
1. Rotate the mode door control dial to each position.
2. Confirm that discharge air comes out according to the air distribution table. Refer to MTC-20, "
Discharge
Air Flow".
NOTE:
Confirm that the compressor clutch (with A/C) is engaged (visual inspection) when DEF ( ) or D/F ( )
is selected.
Can a symptom be duplicated?
YES >> GO TO 3.
NO >> GO TO 2.
2.PERFORM COMPLETE OPERATIONAL CHECK
Perform a complete operational check and check for any symptoms. Refer to MTC-30, "
Operational Check".
Can a symptom be duplicated?
YES >> Refer to MTC-22, "How to Perform Trouble Diagnosis for Quick and Accurate Repair".
NO >> System OK.
3.CHECK FOR SERVICE BULLETINS
Check for any service bulletins.
>> GO TO 4.
4.CHECK MODE DOOR CONTROL CABLE
Check and verify mode door mechanism for smooth operation in each mode.
OK or NG
OK >> If the symptom still exists, perform a complete operational check and check for other symptoms.
Refer to MTC-30, "
Operational Check". If other symptoms exist, refer to MTC-22, "How to Perform
Trouble Diagnosis for Quick and Accurate Repair" .
NG >> Repair or adjust mode door control cable. Refer to MTC-65, "
Mode Door Cable Adjustment".
Air Mix DoorINFOID:0000000001704302
SYMPTOM: Air mix door does not change.
INSPECTION FLOW
1.CONFIRM SYMPTOM BY PERFORMING OPERATIONAL CHECK - TEMPERATURE INCREASE
1. Turn the temperature control dial clockwise until maximum heat.
2. Check for hot air at discharge air outlets.
>> GO TO 2.
2.CONFIRM SYMPTOM BY PERFORMING OPERATIONAL CHECK - TEMPERATURE DECREASE
1. Turn the temperature control dial counterclockwise until maximum cold.
2. Check for cold air at discharge air outlets.
Can a symptom be duplicated?
YES >> GO TO 4.
NO >> GO TO 3.
3.PERFORM COMPLETE OPERATIONAL CHECK
Perform a complete operational check and check for any symptoms. Refer to MTC-30, "
Operational Check".
Can a symptom be duplicated?
YES >> Refer to MTC-22, "How to Perform Trouble Diagnosis for Quick and Accurate Repair".
NO >> System OK.
4.CHECK FOR SERVICE BULLETINS
Check for any service bulletins.

Page 2371 of 2771

NISSAN LATIO 2008 Service Repair Manual TROUBLE DIAGNOSIS
MTC-33
< SERVICE INFORMATION >
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>> GO TO 5.
5.CHECK AIR MIX DOOR CONTROL LINKAGE
Check and verify air mix door mechanism for smooth operation.
OK or

TROUBLE DIAGNOSIS
MTC-33
< SERVICE INFORMATION >
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>> GO TO 5.
5.CHECK AIR MIX DOOR CONTROL LINKAGE
Check and verify air mix door mechanism for smooth operation.
OK or NG
OK >> If the symptom still exists, perform a complete operational check. Refer to MTC-30, "Operational
Check" If other symptoms exist, refer to MTC-22, "How to Perform Trouble Diagnosis for Quick
and Accurate Repair".
NG >> Repair or adjust air mix door control linkage. Refer to MTC-64, "
Air Mix Door Cable Adjustment".
Intake DoorINFOID:0000000001704303
SYMPTOM:
• Intake door does not change.
INSPECTION FLOW
1.CONFIRM SYMPTOM BY PERFORMING OPERATIONAL CHECK - REC ( )
1. Slide the intake door lever to the REC ( ) position.
2. Turn the blower motor to maximum speed.
3. Slide the intake door lever to the FRE position.
4. Listen for intake door position change (you should hear blower sound change slightly).
Can a symptom be duplicated?
YES >> GO TO 3.
NO >> GO TO 2.
2.PERFORM COMPLETE OPERATIONAL CHECK
Perform a complete operational check and check for any symptoms. Refer to MTC-30, "
Operational Check" .
Can a symptom be duplicated?
YES >> Refer to MTC-22, "How to Perform Trouble Diagnosis for Quick and Accurate Repair" .
NO >> System OK.
3.CHECK FOR SERVICE BULLETINS
Check for any service bulletins.
>> GO TO 4.
4.CHECK INTAKE DOOR CONTROL LINKAGE
Check intake door control linkage mechanism for smooth operation.
OK or NG
OK >> If the symptom still exists, perform a complete operational check. Refer to MTC-30, "Operational
Check" . If other symptoms exist, refer to MTC-22, "How to Perform Trouble Diagnosis for Quick
and Accurate Repair" .
NG >> Repair or adjust control linkage. Refer to MTC-63, "
Intake Door Cable Adjustment" .
Front Blower Motor CircuitINFOID:0000000001819758
SYMPTOM: Front blower motor operation is malfunctioning.
INSPECTION FLOW
1.CONFIRM SYMPTOM BY PERFORMING OPERATIONAL CHECK - FRONT BLOWER
1. Turn blower control dial to "1" position. Blower should operate on low speed.
2. Turn the blower control dial to "2" position, and continue checking blower speed until all speeds are
checked.
Can the symptom be duplicated?
YES >> GO TO 2.

Page 2372 of 2771

NISSAN LATIO 2008 Service Repair Manual MTC-34
< SERVICE INFORMATION >
TROUBLE DIAGNOSIS
NO >> GO TO 3.
2.PERFORM COMPLETE OPERATIONAL CHECK
Perform a complete operational check and check for any symptoms. Refer to MTC-30, "
Operational

Page 2373 of 2771

NISSAN LATIO 2008 Service Repair Manual TROUBLE DIAGNOSIS
MTC-35
< SERVICE INFORMATION >
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NG >> Check power supply circuit and 15A fuses [Nos. 15 and 17, located in the fuse block (J/B)].
Refer to PG-3, "

Page 2374 of 2771

NISSAN LATIO 2008 Service Repair Manual MTC-36
< SERVICE INFORMATION >
TROUBLE DIAGNOSIS
1. Disconnect front air control connector.
2. Check continuity between front blower motor harness connector
M62 (A) terminal 2 and front air control ha

Page 2375 of 2771

NISSAN LATIO 2008 Service Repair Manual TROUBLE DIAGNOSIS
MTC-37
< SERVICE INFORMATION >
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OK >> GO TO 11.
NG >> Repair harness or connector.
11 .CHECK FAN SWITCH
Check continuity between front air control ter

Page 2376 of 2771

NISSAN LATIO 2008 Service Repair Manual MTC-38
< SERVICE INFORMATION >
TROUBLE DIAGNOSIS
Perform diagnostic procedure for the magnetic clutch. Refer to "DIAGNOSTIC PROCEDURE FOR MAGNET
CLUTCH".
OK or NG
OK >> If the symptom still ex

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