NISSAN LATIO 2007 Service Repair Manual

TROUBLE DIAGNOSIS
MTC-29
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MTC
Revision: June 20062007 Versa
Wiring Diagram — A/C,M —EJS00595
LJWA0018E

MTC-30
TROUBLE DIAGNOSIS
Revision: June 20062007 Versa
LJWA0019E

TROUBLE DIAGNOSIS
MTC-31
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MTC
Revision: June 20062007 Versa
LJWA0020E

MTC-32
TROUBLE DIAGNOSIS
Revision: June 20062007 Versa
LJWA0021E

TROUBLE DIAGNOSIS
MTC-33
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MTC
Revision: June 20062007 Versa
Operational CheckEJS0057J
The purpose of the operational check is to confirm that the system operates properly.
CHECKING BLOWER
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-37, "
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-22, "
Discharge
Air Flow" .
If NG, go to trouble diagnosis procedure for MTC-34, "
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-36, "
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-50, "
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-58, "
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-41, "
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).
If NG, go to trouble diagnosis procedure for MTC-41, "
Magnet Clutch Circuit (If Equipped)" .
If all operational checks are OK (symptom cannot be duplicated), go to MTC-24, "
How to Perform Trouble
Diagnosis for Quick and Accurate Repair" and perform tests as outlined. If symptom appears, refer to MTC-
24, "SYMPTOM TABLE" and perform applicable trouble diagnosis procedures. Conditions : Engine running at normal operating temperature

MTC-34
TROUBLE DIAGNOSIS
Revision: June 20062007 Versa
Mode DoorEJS0057K
SYMPTOM: Air outlet does not change.
INSPECTION FLOW
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-22, "
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-33, "
Operational Check" .
Can a symptom be duplicated?
YES >> Refer to MTC-24, "SYMPTOM TABLE" .
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-33, "
Operational Check" . If other symptoms exist, refer to MTC-24, "SYMPTOM
TABLE" .
NG >> Repair or adjust mode door control cable. Refer to MTC-71, "
Mode Door Cable Adjustment" .

TROUBLE DIAGNOSIS
MTC-35
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MTC
Revision: June 20062007 Versa
Air Mix DoorEJS0057L
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-33, "
Operational Check" .
Can a symptom be duplicated?
YES >> Refer to MTC-24, "SYMPTOM TABLE" .
NO >> System OK.
4. CHECK FOR SERVICE BULLETINS
Check for any service bulletins.
>> 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-33, "Operational
Check" . If other symptoms exist, refer to MTC-24, "SYMPTOM TABLE" .
NG >> Repair or adjust air mix door control linkage. Refer to MTC-70, "
Air Mix Door Cable Adjustment" .

MTC-36
TROUBLE DIAGNOSIS
Revision: June 20062007 Versa
Intake Door EJS0057M
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-33, "
Operational Check" .
Can a symptom be duplicated?
YES >> Refer to MTC-24, "SYMPTOM TABLE" .
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-33, "Operational
Check" . If other symptoms exist, refer to MTC-24, "SYMPTOM TABLE" .
NG >> Repair or adjust control linkage. Refer to MTC-69, "
Intake Door Cable Adjustment" .

TROUBLE DIAGNOSIS
MTC-37
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MTC
Revision: June 20062007 Versa
Blower Motor CircuitEJS0057N
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 3.
NO >> GO TO 2.
2. PERFORM COMPLETE OPERATIONAL CHECK
Perform a complete operational check and check for any symptoms. Refer to MTC-33, "
Operational Check" .
Can a symptom be duplicated?
YES >> Refer to MTC-24, "SYMPTOM TABLE" .
NO >> System OK.
3. CHECK FOR SERVICE BULLETINS
Check for any service bulletins.
>> GO TO 4.
4. CHECK FRONT BLOWER MOTOR CIRCUIT
Check front blower motor circuit. Refer to MTC-38, "
DIAGNOSTIC PROCEDURE FOR BLOWER MOTOR" .
OK or NG?
OK >> If the symptom still exists, perform a complete operational check. Refer to MTC-33, "Operational
Check" . If other symptoms exist, refer to MTC-24, "SYMPTOM TABLE" .
NG >> Repair as necessary.

MTC-38
TROUBLE DIAGNOSIS
Revision: June 20062007 Versa
DIAGNOSTIC PROCEDURE FOR BLOWER MOTOR
SYMPTOM: Blower motor operation is malfunctioning.
1. CHECK BLOWER MOTOR OPERATION
1. Turn ignition switch ON.
2. Check blower motor operation at each fan speed.
OK or NG
OK >> Inspection End.
NG >>

Blower motor does not operate at any speed, GO TO 2

Blower motor does not operate at one or more of the four speeds, GO TO 8.
2. CHECK POWER SUPPLY FOR BLOWER MOTOR
1. Turn ignition switch OFF.
2. Disconnect front blower motor connector.
3. Turn ignition switch ON.
4. Check voltage between front blower motor harness connector
M62 terminal 1 and ground.
OK or NG
OK >> GO TO 3.
NG >> Check power supply circuit and 15A fuses [Nos. 15 and 17, located in the fuse block (J/B)]. Refer
to PG-76, "
FUSE BLOCK-JUNCTION BOX (J/B)" .

If fuses are OK, check harness for open circuit. Repair or replace if necessary.

If fuses are NG, replace fuse and check harness for short circuit. Repair or replace if necessary.
3. CHECK FRONT BLOWER MOTOR
Check continuity between front blower motor terminals 1 and 2.
NOTE:
Ensure that there are no foreign particles inside the A/C unit assem-
bly for a smooth rotation of the blower motor.
OK or NG
OK >> GO TO 4.
NG >> Replace front blower motor. Refer to MTC-68,
"BLOWER MOTOR" .
WJIA2227E
Terminals
Vo ltag e
(Approx.) (+) (−)
Connector Terminal
Ground
Front blower
motor: M621 Battery voltage
WJIA2228E
1 - 2 : Continuity should exist.
WJIA2230E