2008 INFINITI QX56 Factory Service Manual

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Page 1129 of 4083

INFINITI QX56 2008 Factory Service Manual TRANSFER CONTROL UNITDLN-99
< ECU DIAGNOSIS > [ATX14B]
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CAUTION:
• If CAN communication is displayed wi th other DTCs, first perform the trouble diagnosis for CAN com

Page 1130 of 4083

INFINITI QX56 2008 Factory Service Manual DLN-100
< SYMPTOM DIAGNOSIS >[ATX14B]
4WD SYSTEM SYMPTOMS
SYMPTOM DIAGNOSIS
4WD SYSTEM SYMPTOMS
Symptom TableINFOID:0000000001737182
If 4WD warning lamp turns ON, perform self-diagnosis. Refer to DLN-

Page 1131 of 4083

INFINITI QX56 2008 Factory Service Manual 4WD SHIFT INDICATOR LAMP AND 4LO INDICATOR LAMP DO NOT TURN ON
DLN-101
< SYMPTOM DIAGNOSIS > [ATX14B]
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4WD SHIFT INDICATOR LAMP AND 4LO INDICATOR LAMP DO NOT
TURN ON
D

4WD SHIFT INDICATOR LAMP AND 4LO INDICATOR LAMP DO NOT TURN ON
DLN-101
< SYMPTOM DIAGNOSIS > [ATX14B]
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4WD SHIFT INDICATOR LAMP AND 4LO INDICATOR LAMP DO NOT
TURN ON
DescriptionINFOID:0000000001737183
4WD shift indicator lamp and 4LO indicator lamp do not turn ON for approx. 1 second when turning ignition
switch to ON.
Diagnosis ProcedureINFOID:0000000001737184
1.CHECK TRANSFER CONTROL UNIT PO WER SUPPLY AND GROUND CIRCUITS
Refer to DLN-22, "
Diagnosis Procedure".
Are the inspection results normal?
YES >> GO TO 2.
NO >> Repair as necessary.
2.CHECK COMBINATION METER POWER SUPPLY AND GROUND CIRCUITS
Refer to MWI-30, "
COMBINATION METER : Diagnosis Procedure".
Are the inspection results normal?
YES >> GO TO 3.
NO >> Perform repairs as necessary.
3.CHECK HARNESS BETWEEN TR ANSFER CONTROL UNIT AND COMBINATION METER
1. Turn ignition switch OFF. (Stay for at least 5 seconds.)
2. Disconnect transfer control unit harness connector.
3. Check continuity between the following terminals.
- Transfer control unit harness connector E142 (B) terminal 2 and combination meter harness connector M24 (A) terminal 38.
- Transfer control unit harness connector E142 (B) terminal 11 and combination meter harness connector M24 (A) terminal 29.
- Transfer control unit harness connector E142 (B) terminal 12 and combination meter harness connector M24 (A) terminal 39.
- Transfer control unit harness connector E142 (B) terminal 21
and combination meter harness connector M24 (A) terminal 28.
Also check harness for short to ground and short to power.
Are the inspection results normal?
YES >> GO TO 4.
NO >> Repair or replace damaged parts.
4.CHECK INDICATOR LAMP CIRCUIT
1. Connect combination meter harness connector.
2. Turn ignition switch ON.
3. Ground the following terminals using suitable wiring.
- Transfer control unit harness connector E142 terminal 2 and ground.
- Transfer control unit harness connector E142 terminal 11 and
ground.
- Transfer control unit harness connector E142 terminal 12 and
ground.
- Transfer control unit harness connector E142 terminal 21 and
ground.
Do indicator lamps turn on?
YES >> GO TO 5.
NO >> Replace combination meter. Refer to MWI-76, "
Removal
and Installation".
Continuity should exist.
AWDIA0184ZZ
SDIA2772E
Revision: March 2010
2008 QX56

Page 1132 of 4083

INFINITI QX56 2008 Factory Service Manual DLN-102
< SYMPTOM DIAGNOSIS >[ATX14B]
4WD SHIFT INDICATOR LAMP AND 4LO
INDICATOR LAMP DO NOT TURN ON
5.SYMPTOM CHECK
Check again.
Are the inspection results normal?
YES >> Inspection End.
NO >> GO TO

Page 1133 of 4083

INFINITI QX56 2008 Factory Service Manual 4WD WARNING LAMP DOES NOT TURN ONDLN-103
< SYMPTOM DIAGNOSIS > [ATX14B]
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4WD WARNING LAMP DOES NOT TURN ON
DescriptionINFOID:0000000001737185
4WD warning lamp does not

Page 1134 of 4083

INFINITI QX56 2008 Factory Service Manual DLN-104
< SYMPTOM DIAGNOSIS >[ATX14B]
4WD WARNING LAMP DOES NOT TURN ON
Are the inspection results normal?
YES >> Inspection End.
NO >> Check transfer control unit pin terminals fo
r damage or loose c

Page 1135 of 4083

INFINITI QX56 2008 Factory Service Manual 4WD SHIFT INDICATOR LAMP OR 4LO INDICATOR LAMP DO NOT CHANGE
DLN-105
< SYMPTOM DIAGNOSIS > [ATX14B]
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4WD SHIFT INDICATOR LAMP OR 4LO INDICATOR LAMP DO NOT
CHANGE
Descr

4WD SHIFT INDICATOR LAMP OR 4LO INDICATOR LAMP DO NOT CHANGE
DLN-105
< SYMPTOM DIAGNOSIS > [ATX14B]
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4WD SHIFT INDICATOR LAMP OR 4LO INDICATOR LAMP DO NOT
CHANGE
DescriptionINFOID:0000000001737187
4WD shift indicator lamp or 4LO indicator lamp do not change when switching the 4WD shift switch.
Diagnosis ProcedureINFOID:0000000001737188
1.CONFIRM THE SYMPTOM
Confirm 4WD shift indicator lamp and 4LO indicator lamp turn on when ignition switch is turned to ON.
Do 4WD shift indicator lamp and 4LO indicator lamp turn on?
YES >> GO TO 2.
NO >> Refer to DLN-101, "
Diagnosis Procedure".
2.CHECK SYSTEM FOR 4WD SHIFT SWITCH
Perform trouble diagnosis for 4WD shift switch system. Refer to DLN-31, "
Diagnosis Procedure".
Are the inspection results normal?
YES >> GO TO 3.
NO >> Repair or replace damaged parts.
3.CHECK SYSTEM FOR WAIT DETECTION SWITCH
Perform trouble diagnosis for wait detection switch system. Refer to DLN-35, "
Diagnosis Procedure".
Are the inspection results normal?
YES >> GO TO 4.
NO >> Repair or replace damaged parts.
4.CHECK SYSTEM FOR NEUTRAL-4LO SWITCH
Perform trouble diagnosis for neutral-4LO switch system. Refer to DLN-28, "
Diagnosis Procedure".
Are the inspection results normal?
YES >> GO TO 5.
NO >> Repair or replace damaged parts.
5.CHECK SYSTEM FOR ATP SWITCH
Perform trouble diagnosis for ATP switch system. Refer to DLN-114, "
Diagnosis Procedure".
Are the inspection results normal?
YES >> GO TO 6.
NO >> Repair or replace damaged parts.
6.CHECK SYSTEM FOR 2-4WD SOLENOID
Perform trouble diagnosis for 2-4W D solenoid system. Refer to DLN-57, "
Diagnosis Procedure".
Are the inspection results normal?
YES >> GO TO 7.
NO >> Repair or replace damaged parts.
7.CHECK SYSTEM FOR TRANSFER CONTROL DEVICE
Perform trouble diagnosis for transfer control device system. Refer to DLN-48, "
Diagnosis Procedure".
Are the inspection results normal?
YES >> GO TO 8.
NO >> Repair or replace damaged parts.
8.CHECK SYSTEM FOR ACTUATOR MOTOR
Perform trouble diagnosis for actuator motor system. Refer to DLN-39, "
Diagnosis Procedure".
Are the inspection results normal?
YES >> GO TO 9.
NO >> Repair or replace damaged parts.
Revision: March 2010 2008 QX56

Page 1136 of 4083

INFINITI QX56 2008 Factory Service Manual DLN-106
< SYMPTOM DIAGNOSIS >[ATX14B]
4WD SHIFT INDICATOR LAMP OR 4L
O INDICATOR LAMP DO NOT CHANGE
9.CHECK SYSTEM FOR ACTUATOR POSITION SWITCH
Perform trouble diagnosis for actuator position switch

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