2004 INFINITI QX56 Factory Service Manual

Page 521 of 3371

INFINITI QX56 2004  Factory Service Manual ATC-116
TROUBLE DIAGNOSIS
Revision: August 20072004 QX56
Low-pressure Side Sometimes Becomes Negative
Low-pressure Side Becomes Negative
Gauge indication Refrigerant cycle Probable cause Corrective ac

Page 522 of 3371

INFINITI QX56 2004  Factory Service Manual TROUBLE DIAGNOSIS
ATC-117
C
D
E
F
G
H
I
K
L
MA
B
AT C
Revision: August 20072004 QX56
Insufficient HeatingEJS002CN
SYMPTOM: Insufficient heating
INSPECTION FLOW
*1 .ATC-56, "Operational Check 
(Front)"

Page 523 of 3371

INFINITI QX56 2004  Factory Service Manual ATC-118
TROUBLE DIAGNOSIS
Revision: August 20072004 QX56
NoiseEJS002CO
SYMPTOM: Noise
INSPECTION FLOW
WJIA0473E

Page 524 of 3371

INFINITI QX56 2004  Factory Service Manual TROUBLE DIAGNOSIS
ATC-119
C
D
E
F
G
H
I
K
L
MA
B
AT C
Revision: August 20072004 QX56
*1ATC-167, "REMOVAL"*2ATC-168, "INSTALLATION"*3AT C - 2 2 ,  "Maintenance of Lubricant 
Quantity in Compressor"
*4A

Page 525 of 3371

INFINITI QX56 2004  Factory Service Manual ATC-120
TROUBLE DIAGNOSIS
Revision: August 20072004 QX56
Self-diagnosisEJS002CP
SYMPTOM: Self-diagnosis cannot be performed.
INSPECTION FLOW
*1AT C - 6 0 ,  "Power Supply and Ground 
Circuit for Front

Page 526 of 3371

INFINITI QX56 2004  Factory Service Manual TROUBLE DIAGNOSIS
ATC-121
C
D
E
F
G
H
I
K
L
MA
B
AT C
Revision: August 20072004 QX56
Memory FunctionEJ S00 2CQ
SYMPTOM: Memory function does not operate.
INSPECTION FLOW
Water Valve CircuitEJS002CR
CO

Page 527 of 3371

INFINITI QX56 2004  Factory Service Manual ATC-122
TROUBLE DIAGNOSIS
Revision: August 20072004 QX56
DIAGNOSTIC PROCEDURE FOR WATER VALVE
1. CHECK WATER VALVE RELAY POWER INPUT CIRCUITS
1. Turn ignition switch OFF.
2. Disconnect water valve rel

Page 528 of 3371

INFINITI QX56 2004  Factory Service Manual TROUBLE DIAGNOSIS
ATC-123
C
D
E
F
G
H
I
K
L
MA
B
AT C
Revision: August 20072004 QX56
4. CHECK WATER VALVE RELAY
Check water valve relay. Refer to ATC-124, "
Wat er Va lve Relay"  .
OK or NG
OK >> GO T