Page 2457 of 2898
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?
RHA635H
YesorNo
Ye s©GO TO 5.
No©Check power supply circuit and 10A (No. 15) fuse at fuse block. Refer to Sedan: EL-11,
Hatchback: EL-28, ªWiring Diagram Ð POWER к.
5 CHECK A/C RELAY AFTER DISCONNECTING IT
Refer to HA-66.
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. 16 or 23 and body ground?
RHA764H
YesorNo
Ye s©GO TO 8.
No©Disconnect A/C relay. Disconnect ECM harness connector. GO TO 7.
TROUBLE DIAGNOSES
Magnet Clutch (Cont'd)
HA-57
Page 2458 of 2898
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. 16 or 23.
RHA765H
Continuity should exist.
If OK, check harness for short.
OK or NG
OK©Check ECM. Refer to EC-164 (QG), ªECM Terminals and Reference Valueº.
NG©Repair harness or connector.
8 CHECK VOLTAGE FOR ECM
Do approx. 12 volts exist between ECM harness terminal No. 68 or 51 and body ground?
RHA766H
YesorNo
Ye s©GO TO 9.
No©Check ECM. Refer to EC-164 (QG), EC-659 (YD), ªECM Terminals and Reference
Valueº.
9 CHECK REFRIGERANT PRESSURE SENSOR
Refer to HA-67.
OK or NG
OK©GO TO 10.
NG©Replace refrigerant pressure sensor.
10 CHECK A/C SWITCH
Refer to HA-67.
OK or NG
OK©GO TO 11.
NG©Replace heater control panel.
TROUBLE DIAGNOSES
Magnet Clutch (Cont'd)
HA-58
Page 2459 of 2898
11 CHECK POWER SUPPLY FOR HEATER CONTROL PANEL (A/C SWITCH)
Do approx. 12 volts exist between heater control panel harness terminal No. 7 and body ground?
NHA487
YesorNo
Ye s©GO TO 13.
No©GO TO 12.
12 CHECK CIRCUIT CONTINUITY BETWEEN HEATER CONTROL PANEL AND ECM
Check circuit continuity between heater control panel harness terminal No. 7 and ECM harness terminal No. 44.
NHA488
Continuity should exist.
If OK, check harness for short.
OK or NG
OK©Check ECM. Refer to EC-164 (QG), EC-659 (YD), ªECM Terminals and Reference
Valueº.
NG©Repair harness or connector.
TROUBLE DIAGNOSES
Magnet Clutch (Cont'd)
HA-59
Page 2460 of 2898
13 CHECK HEATER CONTROL PANEL CIRCUIT
Check circuit continuity between heater control panel harness terminal No. 8 and 18.
NHA489
Continuity should exist.
If OK, check harness for short.
OK or NG
OK©GO TO 14.
NG©Repair harness or connector.
14 CHECK CIRCUIT CONTINUITY BETWEEN ECM AND HEATER CONTROL PANEL
Check circuit continuity between ECM harness terminal No. 68 or 51 and heater control panel harness terminal No. 14 or
18.
RHA770H
Continuity should exist.
If OK, check harness for short.
OK or NG
OK©GO TO 15.
NG©Repair harness or connector.
15 CHECK FAN SWITCH
Refer to HA-54.
YesorNo
Ye s©GO TO 16.
No©Replace heater control panel.
TROUBLE DIAGNOSES
Magnet Clutch (Cont'd)
HA-60
Page 2461 of 2898
16 CHECK BODY GROUND CIRCUIT
Check circuit continuity between heater control panel harness terminal No. 9 or 13 and body ground.
RHA771H
Continuity should exist.
If OK, check harness for short.
OK or NG
OK©INSPECTION END
NG©Repair harness or connector.
MAGNET CLUTCH CIRCUIT (FOR YD ENGINE)NJHA0203SYMPTOM:
+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?
RHA794H
YesorNo
Ye s©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-85.
TROUBLE DIAGNOSES
Magnet Clutch (Cont'd)
HA-61
Page 2462 of 2898
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.
RHA634H
Continuity should exist.
If OK, check harness for short.
OK or NG
OK©GO TO 4.
NG©Repair harness or connector.
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?
RHA635H
YesorNo
Ye s©GO TO 5.
No©Check power supply circuit and 10A (No. 15) fuse at fuse block. Refer to Sedan: EL-11,
Hatchback: EL-28, ªWiring Diagram Ð POWER к.
5 CHECK A/C RELAY AFTER DISCONNECTING IT
Refer to HA-66.
OK or NG
OK©Reconnect A/C relay. GO TO 6.
NG©Replace A/C relay.
TROUBLE DIAGNOSES
Magnet Clutch (Cont'd)
HA-62
Page 2463 of 2898
6 CHECK COIL SIDE CIRCUIT OF A/C RELAY
Do approx. 12 volts exist between ECM harness terminal No. 15 or 204 and body ground?
RHA772H
YesorNo
Ye s©GO TO 8.
No©Disconnect A/C relay. Disconnect ECM harness connector. GO TO 7.
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. 15 or 204.
RHA773H
Continuity should exist.
If OK, check harness for short.
OK or NG
OK©Check ECM. Refer to EC-164 (QG), EC-659 (YD), ªECM Terminals and Reference
Valueº.
NG©Repair harness or connector.
TROUBLE DIAGNOSES
Magnet Clutch (Cont'd)
HA-63
Page 2464 of 2898
8 CHECK VOLTAGE FOR ECM
Do approx. 12 volts exist between ECM harness terminal No. 21 or 403 and body ground?
RHA774H
YesorNo
Ye s©GO TO 9.
No©Check ECM. Refer to EC-164 (QG), EC-659 (YD), ªECM Terminals and Reference
Valueº.
9 CHECK POWER SUPPLY FOR DUAL-PRESSURE SWITCH
Do approx. 12 volts exist between dual-pressure switch harness terminal No. 2 and body ground?
RHA775H
YesorNo
Ye s©GO TO 10.
No©Repair harness or connector.
10 CHECK DUAL-PRESSURE SWITCH
Refer to HA-67.
OK or NG
OK©GO TO 11.
No©Replace dual-pressure switch.
TROUBLE DIAGNOSES
Magnet Clutch (Cont'd)
HA-64