Infiniti G20 (P11). Manual — part 436
2
CHECK CIRCUIT CONTINUITY BETWEEN A/C RELAY AND COMPRESSOR HARNESS
Check circuit continuity between A/C relay harness terminal No. 3 and compressor harness terminal No. 1.
Continuity should exist.
RHA061H
If OK, check harness for short.
OK or NG
OK
©
GO TO 3.
NG
©
Repair harness or connector.
3
CHECK POWER SUPPLY FOR A/C RELAY
Disconnect A/C relay.
Do approx. 12 volts exist between A/C relay harness terminal Nos. 1, 5 and body ground?
RHA062H
Yes or No
Yes
©
GO TO 4.
No
©
Check power supply circuit and 10A (No. 6) fuse at fuse block.
Refer to EL-14, “Wiring Diagram — POWER —”.
I
If OK, check for open circuit in wiring harness.
Repair or replace as necessary.
I
If NG, replace fuse and check wiring harness for short circuit.
Repair or replace as necessary.
4
CHECK A/C RELAY AFTER DISCONNECTING IT
Refer to HA-79.
OK or NG
OK
©
Reconnect A/C relay. And GO TO 5.
NG
©
1. Replace A/C relay.
2. Go to self-diagnosis step-by-step procedure (HA-32) and perform self-diagnosis
STEP-4.
Confirm that magnet clutch operation is normal.
GI
MA
EM
LC
EC
FE
CL
MT
AT
AX
SU
BR
ST
RS
BT
SC
EL
IDX
TROUBLE DIAGNOSES
AUTO
Magnet Clutch (Cont’d)
HA-75
5
CHECK COIL SIDE CIRCUIT OF A/C RELAY
Do approx. 12 volts exist between ECM harness terminal No. 23 and body ground?
RHA534H
Yes or No
Yes
©
GO TO 6.
No
©
Disconnect A/C relay.
Disconnect ECM harness connector.
GO TO 12.
6
CHECK VOLTAGE FOR ECM
Do approx. 12 volts exist between ECM harness terminal No. 44 and body ground?
RHA536HD
Yes or No
Yes
©
Disconnect ECM harness connector.
Disconnect refrigerant pressure sensor harness connector.
GO TO 7.
No
©
Check ECM. Refer to EC-134, “ECM Terminals and Reference Value”.
7
CHECK REFRIGERANT PRESSURE SENSOR
Refer to HA-79.
OK
©
GO TO 8.
NG
©
Replace refrigerant pressure sensor.
TROUBLE DIAGNOSES
AUTO
Magnet Clutch (Cont’d)
HA-76
8
CHECK VOLTAGE FOR THERMO CONTROL AMP.
Do approx. 12 volts exist between thermo control amp. harness terminal No. 3 and body ground?
RHA065H
Yes or No
Yes
©
GO TO 9.
No
©
Repair harness or connector.
9
CHECK POWER SUPPLY FOR THERMO CONTROL AMP.
Do approx. 12 volts exist between thermo control amp. harness terminal No. 1 and body ground?
RHA341FA
Yes or No
Yes
©
GO TO 10.
No
©
Check power supply circuit and 10A (No. 6) fuse at fuse block.
Refer to EL-14, “Wiring Diagram — POWER —”.
I
If OK, check for open circuit in wiring harness. Repair or replace as necessary.
I
If NG, replace fuse and check wiring harness for short circuit.
Repair or replace as necessary.
GI
MA
EM
LC
EC
FE
CL
MT
AT
AX
SU
BR
ST
RS
BT
SC
EL
IDX
TROUBLE DIAGNOSES
AUTO
Magnet Clutch (Cont’d)
HA-77
10
CHECK THERMO CONTROL AMP. OPERATION
Reconnect thermo control amp. harness connector.
Does magnet clutch engage when short circuit between thermo control amp. haness terminal No. 2 and body ground?
RHA066H
Yes or No
Yes
©
GO TO 11.
No
©
Replace thermo control amp.
11
CHECK CIRCUIT CONTINUITY BETWEEN THERMO CONTROL AMP. AND AUTO AMP.
Check circuit continuity between thermo control amp. harness terminal No. 2 and auto amp. harness terminal No. 22.
Continuity should exist.
RHA067H
If OK, check harness for short.
OK or NG
OK
©
Replace auto amp.
NG
©
Repair harness or connector.
TROUBLE DIAGNOSES
AUTO
Magnet Clutch (Cont’d)
HA-78
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