Infiniti G20 (P11). Manual — part 461
MAGNET CLUTCH CIRCUIT
=NCHA0156
SYMPTOM:
I
Magnet clutch does not engage when A/C switch and fan
switch are ON.
1
CHECK POWER SUPPLY FOR COMPRESSOR
Disconnect compressor harness connector.
Do approx. 12 volts exist between compressor harness terminal No. 1 and body ground?
RHA747FG
Yes or No
Yes
©
GO TO 2.
No
©
Disconnect A/C relay. GO TO 3.
2
CHECK MAGNET CLUTCH COIL
OK or NG
NG
©
Replace magnet clutch. Refer to HA-197.
3
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.
RHA127H
If OK, check harness for short.
OK or NG
OK
©
GO TO 4.
NG
©
Repair harness or connector.
GI
MA
EM
LC
EC
FE
CL
MT
AT
AX
SU
BR
ST
RS
BT
SC
EL
IDX
TROUBLE DIAGNOSES
MANUAL
Magnet Clutch (Cont’d)
HA-175
4
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 5.
No
©
Check power supply circuit and 10A (No. 6) fuse at fuse block. Refer to EL-14, “Wiring
Diagram — POWER —”.
5
CHECK A/C RELAY AFTER DISCONNECTING IT
Refer to HA-180.
OK or NG
OK
©
Reconnect A/C relay. GO TO 6.
NG
©
Replace A/C relay.
6
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 8.
No
©
Disconnect A/C relay. Disconnect ECM harness connector. GO TO 7.
TROUBLE DIAGNOSES
MANUAL
Magnet Clutch (Cont’d)
HA-176
7
CHECK CIRCUIT CONTINUITY BETWEEN A/C RELAY AND ECM HARNESS
Check circuit continuity between A/C relay harness terminal No. 2 and ECM harness terminal No. 23.
Continuity should exist.
RHA535H
If OK, check harness for short.
OK or NG
OK
©
Check ECM. Refer to EC-134, “ECM Terminals and Reference Value”.
NG
©
Repair harness or connector.
8
CHECK VOLTAGE FOR ECM
Do approx. 12 volts exist between ECM harness terminal No. 44 and body ground?
RHA536HD
Yes or No
Yes
©
GO TO 9.
No
©
Check ECM. Refer to EC-134, “ECM Terminals and Reference Value”.
9
CHECK REFRIGERANT PRESSURE SENSOR
Refer to HA-181.
OK or NG
OK
©
GO TO 10.
NG
©
Replace refrigerant pressure sensor.
GI
MA
EM
LC
EC
FE
CL
MT
AT
AX
SU
BR
ST
RS
BT
SC
EL
IDX
TROUBLE DIAGNOSES
MANUAL
Magnet Clutch (Cont’d)
HA-177
10
CHECK POWER SUPPLY FOR THERMO CONTROL AMP.
Do approx. 12 volts exist between thermo control amp. harness terminal No. 3 and body ground?
RHA131H
Yes or No
Yes
©
GO TO 11.
No
©
Repair harness or connector.
11
CHECK POWER SUPPLY FOR THERMO CONTROL AMP.
Do approx. 12 volts exist between thermo control amp. harness terminal No. 1 and body ground?
RHA132H
Yes or No
Yes
©
GO TO 12.
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.
TROUBLE DIAGNOSES
MANUAL
Magnet Clutch (Cont’d)
HA-178
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