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TROUBLE DIAGNOSIS
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10. CHECK BCM INPUT (FAN ON) SIGNAL
1. Turn ignition switch ON.
2. Turn blower control dial to "1" position.
3. Confirm fan on signal between front air control harness connec-
tor M33 terminal 14 and ground using oscilloscope.
OK or NG
OK >> GO TO 12.
NG >> GO TO 11.
11 . CHECK CIRCUIT CONTINUITY BETWEEN BCM AND FRONT AIR CONTROL
1. Turn ignition switch OFF.
2. Disconnect front air control connector and BCM connector.
3. Check continuity between BCM harness connector M18 (A) ter-
minal 28 and front air control harness connector M33 (B) termi-
nal 14.
OK or NG
OK >> GO TO 12.
NG >> Repair harness or connector.
12. CHECK FAN SWITCH CIRCUIT
1. Turn blower control dial to the OFF position.
2. Check continuity between front air control terminals 9 and 14.
OK or NG
OK >> GO TO 13.
NG >> Replace front air control. Refer to MTC-61, "
CONTROL-
LER" .
Terminals
Voltag e
(Approx.) (+)
(-)
Connector Terminal
Front air con-
trol: M3314 Ground
SJIA0750E
ZJIA0583J
AB
Continuity
Connector Terminal Connector Terminal
BCM: M18 28Front air control:
M3314 Yes
SJIA0751E
9 - 14 :Continuity should exist
SJIA0753E
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MTC-46
TROUBLE DIAGNOSIS
Revision: June 20062007 Versa
13. CHECK FRONT AIR CONTROL GROUND CIRCUIT
Check continuity between front air control harness connector M33
terminal 9 and ground.
OK or NG
OK >> GO TO 14.
NG >> Repair harness or connector.
14. CHECK BCM INPUT (COMPRESSOR ON) SIGNAL
1. Reconnect BCM connector and front air control connectors.
2. Turn ignition switch ON.
3. Turn blower control dial clockwise to position "1".
4. Confirm compressor on signal between front air control harness
connector M33 terminal 1 and ground using oscilloscope.
OK or NG
OK >> GO TO 15.
NG >> GO TO 17.
15. CHECK A/C SWITCH CIRCUIT
1. Turn ignition switch OFF.
2. Disconnect front air control connector.
3. While pressing the A/C switch, check continuity between front
air control terminals 1 and 8.
OK or NG
OK >> GO TO 16.
NG >> Replace front air control. Refer to MTC-61, "
CONTROL-
LER" . 9 - Ground :Continuity should exist
SJIA0754E
Te r m i n a l s
Voltag e
(Approx.) (+)
(-)
Connector Terminal
Front air control:
M331Ground
SJIA0755E
ZJIA0584J
1 - 8 :Continuity should exist
SJIA0756E
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16. CHECK FRONT AIR CONTROL GROUND CIRCUIT
Check continuity between front air control harness connector M33
terminal 8 and ground.
OK or NG
OK >> GO TO 17.
NG >> Repair harness or connector.
17. CHECK POWER SUPPLY FOR THERMO CONTROL AMP.
1. Turn ignition switch OFF.
2. Disconnect thermo control amp. connector.
3. Turn ignition switch ON.
4. Confirm thermo amp signal between thermo control amp. har-
ness connector M42 terminal 3 and ground using oscilloscope.
OK or NG
OK >> GO TO 18.
NG >> GO TO 20.
18. CHECK POWER SUPPLY FOR THERMO CONTROL AMP.
Check voltage between thermo control amp. harness connector M42
terminal 1 and ground.
OK or NG
OK >> GO TO 19.
NG >> Check power supply circuit and 10A fuse [No. 16,
located in the fuse block (JB)]. Refer to PG-76, "
FUSE
BLOCK-JUNCTION BOX (J/B)" .
If fuse is OK, check harness for open circuit. Repair or
replace if necessary.
If fuse is NG, replace fuse and check harness for
short circuit. Repair or replace if necessary. 8 - Ground :Continuity should exist
SJIA0758E
Te r m i n a l s
Vo ltag e
(Approx.) (+)
(-)
Connector Terminal
Thermo control
amp.: M423Ground
SJIA0760E
ZJIA0719J
1 - Ground :Battery voltage
SJIA0762E
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MTC-48
TROUBLE DIAGNOSIS
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19. CHECK THERMO CONTROL AMP. GROUND CIRCUIT
1. Turn ignition switch OFF.
2. Check continuity between thermo control amp. harness connec-
tor M42 terminal 2 and ground.
OK or NG
OK >> Replace thermo control amp. Refer to MTC-63,
"THERMO CONTROL AMPLIFIER" .
NG >> Repair harness or connector.
20. CHECK CIRCUIT CONTINUITY BETWEEN THERMO CONTROL AMP. AND BCM
1. Turn ignition switch OFF.
2. Disconnect BCM connector.
3. Check continuity between thermo control amp. harness connec-
tor M42 (A) terminal 3 and BCM harness connector M18 (B) ter-
minal 26.
OK or NG
OK >> GO TO 21.
NG >> Repair harness or connector.
21. CHECK CAN COMMUNICATION
Check CAN communication. Refer to LAN-44, "
TROUBLE DIAGNOSIS" .
BCM – ECM
ECM – IPDM E/R
OK or NG
OK >> Replace BCM. Refer to BCS-25, "Removal and Installation of BCM" .
NG >> Repair or replace malfunctioning part(s).
22. CHECK DEFROST A/C SWITCH CIRCUIT
1. Turn ignition switch OFF.
2. Disconnect BCM connector.
3. Press the defrost A/C switch.
NOTE:
The defrost A/C switch is located on back side of the front air
control.
4. Check continuity between BCM harness connector M18 terminal
10 and ground.
OK or NG
OK >> Replace BCM. Refer to BCS-25, "Removal and Installation of BCM" .
NG >> GO TO 23.2 - Ground :Continuity should exist
SJIA0763E
3 - 26 :Continuity should exist
SJIA0764E
10 - Ground :Continuity should existWJIA2252E
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23. CHECK CIRCUIT CONTINUITY BETWEEN DEFROST A/C SWITCH AND BCM
1. Disconnect defrost A/C switch connector.
2. Check continuity between BCM harness connector M18 (B) ter-
minal 10 and defrost A/C switch harness connector M41 (A) ter-
minal 15.
OK or NG
OK >> GO TO 24.
NG >> Repair harness or connector.
24. CHECK CIRCUIT CONTINUITY BETWEEN DEFROST A/C SWITCH AND GROUND
Check continuity between A/C defrost switch harness connector
M41 terminal 16 and ground.
OK or NG
OK >> Replace defrost A/C switch.
NG >> Repair harness or connector.10 - 15 :Continuity should exist
WJIA2254E
16 - Ground :Continuity should exist
WJIA2255E
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MTC-50
TROUBLE DIAGNOSIS
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Insufficient CoolingEJS0057P
SYMPTOM: Insufficient cooling
INSPECTION FLOW
1. CONFIRM SYMPTOM BY PERFORMING OPERATIONAL CHECK - TEMPERATURE DECREASE
1. Turn temperature control dial counterclockwise to maximum cold position.
2. Check for cold air at discharge air outlets.
Can the symptom be duplicated?
YES >> GO TO 3.
NO >> GO TO 2.
2. CHECK FOR ANY SYMPTOMS
Perform a complete operational check for any symptoms. Refer to MTC-33, "
Operational Check" .
Does another symptom exist?
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 COMPRESSOR DRIVE BELT TENSION
Check compressor belt tension. Refer to EM-13, "
Checking Drive Belts" .
OK or NG
OK >> GO TO 5.
NG >> Adjust or replace compressor belt. Refer to EM-13, "
Removal and Installation" .
5. CHECK AIR MIX DOOR CABLE
Check and verify air mix door cable operation. Refer to MTC-70, "
Air Mix Door Cable Adjustment" .
Does air mix door operate correctly?
YES >> GO TO 6.
NO >> Repair or replace as necessary.
6. CHECK COOLING FAN MOTOR OPERATION
Check and verify cooling fan motor for smooth operation. Refer to EC-443, "
System Description" .
Does cooling fan motor operate correctly?
YES >> GO TO 7.
NO >> Check cooling fan motor. Refer to EC-443, "
DTC P1217 ENGINE OVER TEMPERATURE" .
7. CHECK FOR EVAPORATOR FREEZE UP
Start engine and run A/C. Check for evaporator freeze up.
Does evaporator freeze up?
YES >> Perform performance test diagnoses. Refer to MTC-52, "PERFORMANCE TEST DIAGNOSIS" .
NO >> GO TO 8.
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8. CHECK REFRIGERANT PRESSURE
Check refrigerant pressure with manifold gauge connected. Refer to MTC-54, "
Test Reading" .
OK or NG
OK >> GO TO 9.
NG >> Perform performance test diagnoses. Refer to MTC-52, "
PERFORMANCE TEST DIAGNOSIS" .
9. CHECK AIR DUCTS
Check ducts for air leaks.
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 air leaks.
Page 2464 of 2896
MTC-52
TROUBLE DIAGNOSIS
Revision: June 20062007 Versa
PERFORMANCE TEST DIAGNOSIS
*1MTC-54, "PERFORMANCE CHART"*2MTC-54, "Te s t R e a d i n g"*3MTC-55, "TROUBLE DIAGNOSIS
FOR UNUSUAL PRESSURE"
*4MTC-70, "Air Mix Door Cable Adjust-
ment"
RJIA1601E