2001 INFINITI QX4 Factory Service Manual

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Page 1905 of 2395

INFINITI QX4 2001 Factory Service Manual RHA094GB SYSTEM DESCRIPTION=NBHA0066Auto amplifier controls compressor operation by ambient tempera- ture and signal from ECM. Low Temperature Protection ControlNBHA0066S01Auto amplifier will turn the

Page 1906 of 2395

INFINITI QX4 2001 Factory Service Manual 2 CHECK CIRCUIT CONTINUITY BETWEEN A/C RELAY AND COMPRESSOR Check circuit continuity between A/C relay harness terminal No. 5 and compressor harness terminal No. 1. RHA748FB Continuity should exist. I

Page 1907 of 2395

INFINITI QX4 2001 Factory Service Manual 5 CHECK COIL SIDE CIRCUIT OF A/C RELAY Do approx. 12 volts exist between ECM harness terminal No. 27 and body ground? RHA482GG YesorNo Ye s©GO TO 6. No©Disconnect A/C relay. Disconnect ECM harness c

Page 1908 of 2395

INFINITI QX4 2001 Factory Service Manual 7 CHECK CIRCUIT CONTINUITY BETWEEN ECM AND AUTO AMP. Check circuit continuity between ECM harness terminal No. 45 and auto amp. harness terminal No. 22. RHA878H Continuity should exist. If OK, check h

Page 1909 of 2395

INFINITI QX4 2001 Factory Service Manual 10 CHECK CIRCUIT CONTINUITY BETWEEN ECM AND AUTO AMP. Check circuit continuity between ECM harness terminal No. 51 and auto amp. harness terminal No. 6 (17). RHA879H Continuity should exist. If OK, ch

Page 1910 of 2395

INFINITI QX4 2001 Factory Service Manual RHA880H SHA315F Refrigerant Pressure SensorNBHA0068S02Make sure that higher A/C refrigerant pressure results in higher refrigerant-pressure sensor output voltage. GI MA EM LC EC FE AT TF PD AX SU BR S

Page 1911 of 2395

INFINITI QX4 2001 Factory Service Manual Insufficient Cooling TROUBLE DIAGNOSIS PROCEDURE FOR INSUFFICIENT COOLING=NBHA0096SYMPTOM: IInsufficient cooling Inspection FlowNBHA0096S01Without Navigation SystemNBHA0096S0101 SHA190FC *1: HA-44 *2:

Page 1912 of 2395

INFINITI QX4 2001 Factory Service Manual With Navigation SystemNBHA0096S0102 RHA881H *1: HA-44 *2: HA-85 *3: HA-116 *4: HA-53 *5: STEP-BY-STEP PROCEDURE (HA-45), see No. 13.*6: HA-77 *7: HA-89 *8: HA-97 *9: HA-106 *10: HA-114*11: HA-66 *12:
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