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1B-4 AIR CONDITIONING (OPTIONAL)
General Diagnosis Table
NOTE:
For M13 and G10 engine models, refer to the same section of the Service Manual mentioned in the
"FOREWORD" of this service manual.
Z13DT Engine Model
Condition
Cool air does not
come out (A/C system
improper operative)
When the blower fan
switch is OFF posi-
tion, blower motor
does not operate at A/
C switch is ON
Diagnosis
Possible Cause
A/C system inoperative
• No refrigerant
• Fuse blown
• A/C switch faulty
• Blower fan switch faulty
• A/C thermistor faulty
• Dual pressure switch faulty
• Wiring or grounding faulty
• ECT sensor faulty
• ECM faulty
Compressor inoperative (dose not
rotate)
• Magnet clutch faulty
• Drive belt loose or broken
• Compressor faulty
• ECM faulty
Radiator (and condenser), cooling
fan motor inoperative
• Fuse blown
• Radiator cooling fan relay faulty
• Wiring or grounding faulty
• Radiator cooling fan motor faulty
• ECM faulty
Blower motor inoperative
• Fuse blown
• Blower resistor faulty
• Blower fan switch faulty
• Wiring or grounding faulty
• Blower motor faulty
• A/C blower motor relay faulty
• Wiring or grounding faulty
• A/C switch faulty
Correction
Recover, evacuation and charging.
Check "IG COIL" fuse, "HEATER" fuse and
check for short circuit to ground.
Check A/C switch.
Check blower fan switch.
Check A/C thermistor.
Check dual pressure switch.
Repair as necessary.
Check ECT sensor.
Check ECM.
Check magnet clutch.
Adjust or replace drive belt.
Check compressor.
Check ECM.
Check RDTR fuse and check short circuit
to ground.
Check radiator cooling fan relay.
Repair as necessary.
Check radiator cooling fan motor.
Check ECM.
Check "HEATER" fuse and check for short
circuit to ground.
Check blower motor resistor.
Check blower fan switch.
Repair as necessary.
Check blower motor.
Check A/C blower motor relay.
Repair as necessary.
Check A/C switch.
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