1B-4
AIR CONDITIONING (OPTIONAL)
SH410
DIAGNOSIS
GENERAL DIAGNOSIS TABLE
Condition
Possible Cause
Correction
Cool air won’t come out
(A/C system won’t
operative)
No refrigerant
Fuse blown
A/C switch faulty
Blower fan motor switch faulty
A/C evaporator thermistor faulty
Dual pressure switch faulty
Wiring or grounding faulty
ECT sensor faulty
ECM and its circuit faulty
Recover, evacuation and charging.
Check “HEATER” fuse, “A/C” fuse,
“Fusible Link” and check short circuit to
ground.
Check A/C switch.
Check blower fan motor switch.
Check A/C evaporator thermistor.
Check dual pressure switch.
Repair as necessary.
Check ECT sensor.
Check ECM and its circuit.
Cool air won’t come out
(A/C compressor won’t
operative (won’t rotative))
Fuse blown
A/C compressor relay faulty
ECM faulty
Magnet clutch faulty
Drive belt loosen or broken
A/C compressor faulty
Check “A/C” fuse, “Fusible Link” and
check short circuit to ground.
Check A/C compressor relay.
Check ECM and its circuit.
Check magnet clutch.
Adjust or replace drive belt.
Check A/C compressor.
Cool air won’t come out
A/C condenser cooling fan
motor won’t operative)
Fuse blown
A/C condenser cooling fan relay
faulty
Wiring or grounding faulty
A/C condenser cooling fan relay
faulty
A/C condenser cooling fan motor
faulty
Check “A/C” fuse, “Fusible Link” and
check short circuit to ground.
Check A/C condenser cooling fan relay.
Repair as necessary.
Check A/C condenser fan relay.
Check A/C condenser cooling fan
motor.
Cool air won’t come out
(Blower motor won’t
operative)
Fuse blown
Blower motor resistor faulty
Blower fan motor switch faulty
Wiring or grounding faulty
Blower fan motor faulty
Check “HEATER” fuse and check short
circuit to ground.
Check blower fan motor resistor.
Check blower fan motor switch.
Repair as necessary.
Check blower fan motor.