TROUBLE DIAGNOSIS
MTC-45
< SERVICE INFORMATION >
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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.
Insufficient CoolingINFOID:0000000001704306
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-30, "
Operational Check".
Does another symptom exist?
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 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-64, "
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-412, "
System Description".
Does cooling fan motor operate correctly?
YES >> GO TO 7.
NO >> Check cooling fan motor. Refer to EC-412
.
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 "PERFORMANCE TEST DIAGNOSIS". 16 - Ground :Continuity should exist
WJIA2255E
