2007 INFINITI QX56 Factory Service Manual

hood open belt oil dipstick center console spare wheel jack points

Page 2897 of 3061

INFINITI QX56 2007 Factory Service Manual TROUBLE DIAGNOSIS FOR SYSTEM
TF-75
< SERVICE INFORMATION >
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4. Turn ignition switch “ON”. (Do not start engine.)
5. Check voltage between transfer shift high relay h

TROUBLE DIAGNOSIS FOR SYSTEM
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4. Turn ignition switch “ON”. (Do not start engine.)
5. Check voltage between transfer shift high relay harness connec-
tor E46 terminal 5 (A), transfer shift low relay harness connector
E47 terminal 5 (B) and ground.
OK or NG
OK >> GO TO 4.
NG >> Check the following. If any items are damaged, repair or replace damaged parts.
• 20A fuse No. 57 located in the fuse and relay box. Refer to PG-3
.
• Harness for short or open between battery, transfer shift high relay harness connector E46 ter-
minal 5 and transfer shift low relay harness connector E47 terminal 5.
4.CHECK HARNESS BETWEEN TRANSFER CONTROL UNIT AND TRANSFER SHIFT RELAY
1. Turn ignition switch “OFF”. (Stay for at least 5 seconds.)
2. Disconnect transfer control unit harness connector and transfer control device (actuator motor) harness
connector.
3. Remove transfer shift high relay and transfer shift low relay. Refer to TF-22, "
Location of Electrical Parts".
4. Check continuity between the following terminals.
- Transfer control unit harness connector E143 terminal 33 (A)
and transfer shift high relay harness connector E46 terminal 3
(B).
- Transfer control unit harness connector E143 terminal 42 (A)
and transfer shift low relay harness connector E47 terminal 3
(C).
Also check harness for short to ground and short to power.
OK or NG
OK >> GO TO 5.
NG >> Repair or replace damaged parts.
5.CHECK TRANSFER SHIFT RELAY GROUND CIRCUIT
1. Turn ignition switch “OFF”. (Stay for at least 5 seconds.)
2. Remove transfer shift high relay and transfer shift low relay.
3. Check continuity between transfer shift high relay harness con-
nector E46 terminals 2, 4 (A), transfer shift low relay harness
connector E47 terminals 2, 4 (B) and ground.
Also check harness for short to ground and short to power.
OK or NG
OK >> GO TO 6.
NG >> Repair open circuit or short to ground or short to power
in harness or connectors.
6.CHECK TRANSFER CONTROL UNIT
Check transfer control unit input/output signal. Refer to TF-35, "
Transfer Control Unit Input/Output Signal Ref-
erence Value".
OK or NG
OK-1 >> With CONSULT-II: GO TO 7.
OK-2 >> Without CONSULT-II: GO TO 8.
NG >> Check transfer control unit pin terminals for damage or loose connection with harness connector.
If any items are damaged, repair or replace damaged parts.
Connector Terminal Voltage (Approx.)
E46 5 - Ground
Battery voltage
E47 5 - Ground
WDIA0311E
Continuity should exist.
WDIA0315E
Continuity should exist.
WDIA0312E

Page 2898 of 3061

INFINITI QX56 2007 Factory Service Manual TF-76
< SERVICE INFORMATION >
TROUBLE DIAGNOSIS FOR SYSTEM
7.PERFORM SELF-DIAGNOSIS (WITH CONSULT-II)
With CONSULT-II
1. Turn ignition switch “ON”. (Do not start engine.)
2. Select “SELF-DIAG R

TF-76
< SERVICE INFORMATION >
TROUBLE DIAGNOSIS FOR SYSTEM
7.PERFORM SELF-DIAGNOSIS (WITH CONSULT-II)
With CONSULT-II
1. Turn ignition switch “ON”. (Do not start engine.)
2. Select “SELF-DIAG RESULTS” mode for “ALL MODE AWD/4WD” with CONSULT-II.
3. Touch “ERASE”.
4. Turn ignition switch “OFF” and wait at least 10 seconds.
5. Perform the self-diagnosis again.
Is the
“SHIFT ACT CIR [P1819]” displayed?
YES >> Replace transfer control unit. Refer to TF-115, "Removal and Installation".
NO >> Inspection End.
8.PERFORM SELF-DIAGNOSIS (WITHOUT CONSULT-II)
Without CONSULT-II1. Perform the self-diagnosis and then erase self-diagnostic results. Refer to TF-48, "Self-Diagnosis Proce-
dure" and TF-48, "Self-Diagnosis Procedure".
2. Perform the self-diagnosis again.
Do the self-diagnostic results indicate transfer control device?
YES >> Replace transfer control unit. Refer to TF-121, "Removal and Installation".
NO >> Inspection End.
Engine Speed Signal (ECM)INFOID:0000000003532540
DIAGNOSTIC PROCEDURE
1.CHECK DTC WITH ECM
Perform self-diagnosis with ECM. Refer to E C - 111 , "
CONSULT-II Function (ENGINE)" .
Is any malfunction detected by self-diagnosis?
YES >> Check the malfunctioning system.
NO >> GO TO 2.
2.CHECK TRANSFER CONTROL UNIT
Check transfer control unit input/output signal. Refer to TF-35, "
Transfer Control Unit Input/Output Signal Ref-
erence Value".
OK or NG
OK >> GO TO 3.
NG >> Check transfer control unit pin terminals for damage or loose connection with harness connector.
If any items are damaged, repair or replace damaged parts.
3.CHECK DTC
Perform the self-diagnosis, after driving a vehicle for a while.
OK or NG
OK >> Inspection End.
NG >> Perform self-diagnosis with ECM again. Refer to E C - 111 , "
CONSULT-II Function (ENGINE)" .
Clutch Pressure SolenoidINFOID:0000000003532541
CONSULT-II REFERENCE VALUE IN DATA MONITOR MODE
Data are reference value.
TRANSFER CONTROL UNIT TERMINALS AND REFERENCE VALUE
Monitored item Content Condition Display value
DUTY SOLENOID [%]Condition of clutch pres-
sure solenoid• Vehicle stopped
• Engine running
• A/T selector lever “N”
position
• Brake pedal depressed4WD shift switch: 2WD 4%
4WD shift switch: AUTO 96 - 4%
4WD shift switch: 4H or
4LO4%

Page 2899 of 3061

INFINITI QX56 2007 Factory Service Manual TROUBLE DIAGNOSIS FOR SYSTEM
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Data are reference value and are measured between each terminal and ground.
CAUTION:
When using a circuit te

Page 2900 of 3061

INFINITI QX56 2007 Factory Service Manual TF-78
< SERVICE INFORMATION >
TROUBLE DIAGNOSIS FOR SYSTEM
2.CHECK HARNESS BETWEEN TRANSFER CONTROL UNIT AND CLUTCH PRESSURE SOLENOID
VA LV E
1. Turn ignition switch “OFF”. (Stay for at least 5 se

Page 2901 of 3061

INFINITI QX56 2007 Factory Service Manual TROUBLE DIAGNOSIS FOR SYSTEM
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5.CHECK CLUTCH PRESSURE SOLENOID
1. Turn ignition switch “OFF”. (Stay for at least 5 seconds.)
2. Disconn

Page 2902 of 3061

INFINITI QX56 2007 Factory Service Manual TF-80
< SERVICE INFORMATION >
TROUBLE DIAGNOSIS FOR SYSTEM
3. Check resistance between transfer terminal cord assembly ter-
minals 6 and 19.
4. If NG, replace clutch pressure solenoid. Refer to TF-22,

Page 2903 of 3061

INFINITI QX56 2007 Factory Service Manual TROUBLE DIAGNOSIS FOR SYSTEM
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Data are reference value and are measured between each terminal and ground.
CAUTION:
When using a circuit te

Page 2904 of 3061

INFINITI QX56 2007 Factory Service Manual TF-82
< SERVICE INFORMATION >
TROUBLE DIAGNOSIS FOR SYSTEM
2. Check voltage between transfer control unit harness connector
terminal and ground.
OK or NG
OK >> GO TO 7.
NG >> GO TO 3.
3.CHECK 4WD SHI

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