
FULL-AUTOMATIC AIR CONDITIONER –
Troubleshooting
55-43
Inspection procedure 2
Air conditioner does not operate.
Probable cause
If the A/C does not operate when the A/C switch is on and the temperature
setting is at 17
_
C, the cause is probably insufficient refrigerant, or a
malfunction of the blower or of the magnet clutch power supply.
D
Malfunction of blower
D
Insufficient refrigerant
D
Malfunction of magnetic clutch
D
Malfunction of air thermo sensor
D
Malfunction of A/C compressor relay
D
Malfunction of refrigerant temperature switch
D
Malfunction of dual pressure switch
D
Malfunction of water temperature switch
D
Malfunction of connector or harness
D
Malfunction of engine-ECU
D
Malfunction of A/C-ECU
Does the blower operate?
NO
Inspection procedure 7 (Refer to P.55-45.)
YES
A/C system refrigerant pressure check (Refer to P.55-13.)
NG
Refill the specified amount of refrigerant. (Refer to P.55-6.)
OK
MUT-
II
Self-Diag code
Is any of the codes 11, 12, 21 and 22 output?
YES
INSPECTION CHART FOR DIAGNOSIS CODES (Refer to
P.55-34.)
NO
D
Magnetic clutch check (Refer to P.55-25.)
D
A/C compressor relay check (Refer to P.55-14.)
D
Refrigerant temperature switch check (Refer to P.55-25.)
D
Dual pressure switch check (Refer to P.55-13.)
D
Water temperature switch check (Refer to P.55-64.)
<2,000>
NG
Replace
OK
Measure at the A/C compressor relay connector A-116X.
D
Disconnect the connector, and measure at the harness
side connector.
(1) Continuity between terminal (4) and body earth
OK: Continuity
(2) Voltage between terminal (5) and body earth
OK: System voltage
OK
Inspection procedure 13 (Refer to P.55-50.)
(2) NG
Check the following connector:
A-116X
(1) NG
Check the following connectors:
A-116X, A-106
NG
Repair
NG
Repair
OK
Check the trouble symptom.
NG
Check the harness between the fusible link and the A/C compressor
relay, and repair if necessary.
OK
Check the trouble symptom.
NG
Check the harness between the magnetic clutch and the A/C
compressor relay, and repair if necessary.