2005 INFINITI QX4 Factory Service Manual

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INFINITI QX4 2005  Factory Service Manual ATC-110
TROUBLE DIAGNOSIS
Revision: October 20052005 QX56
COMPONENT INSPECTION
Rear Blower Motor Relay
Check circuit continuity between terminals 3 and 5 by supplying 12
volts and ground to coil side

Page 506 of 3419

INFINITI QX4 2005  Factory Service Manual TROUBLE DIAGNOSIS
ATC-111
C
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B
AT C
Revision: October 20052005 QX56
Rear Blower Motor
Check that there are no foreign particles inside the intake unit.
Apply 12 volts to terminal 2 a

Page 507 of 3419

INFINITI QX4 2005  Factory Service Manual ATC-112
TROUBLE DIAGNOSIS
Revision: October 20052005 QX56
Rear Air Control CircuitEJS003XU
SYMPTOM:
Temperature cannot be adjusted from the rear air control.
INSPECTION FLOW
*1AT C - 6 0 ,  "Operatio

Page 508 of 3419

INFINITI QX4 2005  Factory Service Manual TROUBLE DIAGNOSIS
ATC-113
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B
AT C
Revision: October 20052005 QX56
SYSTEM DESCRIPTION
Component Parts
Rear air control system components are:
Front air control
Rear air control
A

Page 509 of 3419

INFINITI QX4 2005  Factory Service Manual ATC-114
TROUBLE DIAGNOSIS
Revision: October 20052005 QX56
2. CHECK CIRCUIT BETWEEN REAR AIR CONTROL AND FRONT AIR CONTROL FOR OPEN AND 
SHORT
1. Turn ignition switch OFF.
2. Disconnect front air contr

Page 510 of 3419

INFINITI QX4 2005  Factory Service Manual TROUBLE DIAGNOSIS
ATC-115
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AT C
Revision: October 20052005 QX56
Magnet Clutch CircuitEJS003XV
SYMPTOM: Magnet clutch does not engage.
INSPECTION FLOW
*1ATC-57, "Operational Check

Page 511 of 3419

INFINITI QX4 2005  Factory Service Manual ATC-116
TROUBLE DIAGNOSIS
Revision: October 20052005 QX56
SYSTEM DESCRIPTION
The front air control controls compressor operation based on ambient and intake temperature and a signal
from ECM.
Low Temp

Page 512 of 3419

INFINITI QX4 2005  Factory Service Manual TROUBLE DIAGNOSIS
ATC-117
C
D
E
F
G
H
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MA
B
AT C
Revision: October 20052005 QX56
2. PERFORM AUTO ACTIVE TEST
Refer to PG-22, "
Auto Active Test" .
Does magnet clutch operate?
YES or NO
YES >>WIT