service INFINITI QX56 2007 Factory Service Manual

TF-60
< SERVICE INFORMATION >
TROUBLE DIAGNOSIS FOR SYSTEM
OK or NG
OK >> GO TO 5.
NG >> Replace 4WD shift switch.
5.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 6.
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.
6.CHECK DTC
Perform the self-diagnosis, after driving a vehicle for a while.
OK or NG
OK >> Inspection End.
NG >> Replace transfer control unit. Refer to TF-115, "
Removal and Installation".
COMPONENT INSPECTION
1. Turn ignition switch “OFF”. (Stay for at least 5 second.)
2. Disconnect 4WD shift switch harness connector.
3. Operate 4WD shift switch and check continuity between 4WD
shift switch terminals.
4. If NG, replace the 4WD shift switch.
Wait Detection SwitchINFOID:0000000003532535
CONSULT-II REFERENCE VALUE IN DATA MONITOR MODE
Connector Terminal Condition Continuity
M1411 - 24WD shift switch: 2WD Yes
4WD shift switch: AUTO, 4H and
4LONo
1 - 34WD shift switch: AUTO Yes
4WD shift switch: 2WD, 4H and
4LONo
1 - 44WD shift switch: 2WD No
4WD shift switch: AUTO, 4H and
4LOYe s
1 - 54WD shift switch: 4H Yes
4WD shift switch: 2WD, AUTO,
and 4LONo
1 - 64WD shift switch: 4LO Yes
4WD shift switch: 2WD, AUTO and
4HNo
WDIA0205E

TROUBLE DIAGNOSIS FOR SYSTEM
TF-61
< SERVICE INFORMATION >
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Data are reference value.
TRANSFER CONTROL UNIT TERMINALS AND REFERENCE VALUE
Data are reference value and are measured between each terminal and ground.
CAUTION:
When using a circuit tester to measure voltage for inspection, be sure not to extend forcibly any connector terminals.
DIAGNOSTIC PROCEDURE
1.CHECK WAIT DETECTION SWITCH SIGNAL
With CONSULT-II
1. Start engine.
2. Select “DATA MONITOR” mode for “ALL MODE AWD/4WD” with CONSULT-II.
3. Read out the value of “WAIT DETCT SW”.
Without CONSULT-II
1. Start engine.
Monitored item Content Condition Display value
WAIT DETCT SW [ON/
OFF]Condition of wait detection
switch• Vehicle stopped
• Engine running
• A/T selector lever “N”
position
• Brake pedal depressed4WD shift switch: 2WD,
AUTO or 4HOFF
4WD shift switch: 4H to
4LO (While actuator mo-
tor is operating.)OFF → ON
4WD shift switch: 4LO to
4H (While actuator motor
is operating.)ON → OFF
4WD shift switch: 4LO ON
Te r m i n a lWire
colorItem Condition Data (Approx.)
43 G/Y Wait detection switch• Vehicle stopped
• Engine running
• A/T selector le-
ver “N” position
• Brake pedal de-
pressed4WD shift switch: 2WD, AUTO or 4H Battery voltage
4WD shift switch: 4H to 4LO (While actua-
tor motor is operating.)Battery voltage
→ 0V
4WD shift switch: 4LO to 4H (While actua-
tor motor is operating.)0V → Battery
voltage
4WD shift switch: 4LO 0V
Condition Display value
• Vehicle stopped
• Engine running
• A/T selector lever “N” position
• Brake pedal depressed4WD shift switch: 2WD, AUTO
or 4HOFF
4WD shift switch: 4H to 4LO
(While actuator motor is operat-
ing.)OFF → ON
4WD shift switch: 4LO to 4H
(While actuator motor is operat-
ing.)ON → OFF
4WD shift switch: 4LO ON
PDIA0221E

TF-62
< SERVICE INFORMATION >
TROUBLE DIAGNOSIS FOR SYSTEM
2. Check voltage between transfer control unit harness connector
terminal and ground.
OK or NG
OK >> GO TO 5.
NG >> GO TO 2.
2.CHECK HARNESS BETWEEN TRANSFER CONTROL UNIT AND WAIT DETECTION SWITCH
1. Turn ignition switch “OFF”. (Stay for at least 5 seconds.)
2. Disconnect transfer control unit harness connector and the wait detection switch harness connector.
3. Check continuity between transfer control unit harness connec-
tor E143 terminal 43 and wait detection switch harness connec-
tor F59 terminal 10.
Also check harness for short to ground and short to power.
OK or NG
OK >> GO TO 3.
NG >> Repair or replace damaged parts.
3.CHECK GROUND CIRCUIT
1. Turn ignition switch “OFF”. (Stay for at least 5 seconds.)
2. Disconnect wait detection switch harness connector.
3. Check continuity between wait detection switch harness con-
nector F59 terminal 11 and ground.
Also check harness for short to ground and short to power.
OK or NG
OK >> GO TO 4.
NG >> Repair open circuit or short to ground or short to power
in harness or connectors.
4.CHECK WAIT DETECTION SWITCH
1. Turn ignition switch “OFF”. (Stay for at least 5 seconds.)
2. Disconnect wait detection switch harness connector.
3. Remove wait detection switch. Refer to TF-22, "
Location of Electrical Parts".
Connector Terminal ConditionVoltage
(Approx.)
E14343 -
Ground• Vehicle stopped
• Engine running
• A/T selector lever
“N” position
• Brake pedal de-
pressed4WD shift switch:
2WD, AUTO or 4HBattery
voltage
4WD shift switch: 4H to
4LO (While actuator
motor is operating.)Battery
voltage
→ 0V
4WD shift switch: 4LO
to 4H (While actuator
motor is operating.)0V →
Battery
voltage
4WD shift switch: 4LO 0V
SDIA2701E
Continuity should exist.
SDIA2702E
Continuity should exist.
SDIA2703E

TROUBLE DIAGNOSIS FOR SYSTEM
TF-63
< SERVICE INFORMATION >
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4. Push and release wait detection switch and check continuity
between wait detection switch terminals 10 and 11.
OK or NG
OK >> GO TO 5.
NG >> Replace wait detection switch. Refer to TF-22, "
Loca-
tion of Electrical Parts".
5.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 6.
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.
6.CHECK DTC
Perform the self-diagnosis, after driving a vehicle for a while.
OK or NG
OK >> Inspection End.
NG >> Replace transfer control unit. Refer to TF-115, "
Removal and Installation".
COMPONENT INSPECTION
1. Turn ignition switch “OFF”. (Stay for at least 5 seconds.)
2. Disconnect wait detection switch harness connector.
3. Remove wait detection switch. Refer to TF-22, "
Location of Electrical Parts".
4. Push and release wait detection switch and check continuity
between wait detection switch terminals 10 and 11.
5. If NG, replace the wait detection switch. Refer to TF-22, "
Loca-
tion of Electrical Parts".
PNP Switch Signal (TCM)INFOID:0000000003532536
DIAGNOSTIC PROCEDURE
1.CHECK DTC WITH TCM
Perform self-diagnosis with TCM. Refer to AT-83, "
CONSULT-II Function (A/T)".
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.
Terminal Condition Continuity
10 - 11Push wait detection switch Yes
Release wait detection switch No
SDIA2704E
Terminal Condition Continuity
10 - 11Push wait detection switch Yes
Release wait detection switch No
SDIA2704E

TF-64
< SERVICE INFORMATION >
TROUBLE DIAGNOSIS FOR SYSTEM
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 TCM again. Refer to AT-83, "
CONSULT-II Function (A/T)".
Actuator MotorINFOID:0000000003532537
CONSULT-II REFERENCE VALUE IN DATA MONITOR MODE
Data are reference value.
TRANSFER CONTROL UNIT TERMINALS AND REFERENCE VALUE
Data are reference value and are measured between each terminal and ground.
Monitored item Content Condition Display value
SHIFT ACT1 [ON/OFF]Output condition to ac-
tuator motor (High)• Vehicle stopped
• Engine running
• A/T selector lever “N”
position
• Brake pedal depressed4WD shift switch: 4H to
4LO (“Wait” function is op-
erating.)ON
Except the above OFF
SHIFT AC MON1 [ON/OFF]Check signal for trans-
fer control unit signal
output• Vehicle stopped
• Engine running
• A/T selector lever “N”
position
• Brake pedal depressed4WD shift switch: 4H to
4LO (“Wait” function is op-
erating.)ON
Except the above OFF
SHIFT ACT2 [ON/OFF]Output condition to ac-
tuator motor (Low)• Vehicle stopped
• Engine running
• A/T selector lever “N”
position
• Brake pedal depressed4WD shift switch: 4LO to
4H (“Wait” function is op-
erating.)ON
Except the above OFF
SHIFT AC MON2 [ON/OFF]Check signal for trans-
fer control unit signal
output• Vehicle stopped
• Engine running
• A/T selector lever “N”
position
• Brake pedal depressed4WD shift switch: 4LO to
4H (“Wait” function is op-
erating.)ON
Except the above OFF
Te r m i n a lWire
colorItem Condition Data (Approx.)
4 Y/L Transfer shift high relay• Vehicle stopped
• Engine running
• A/T selector le-
ver “N” position
• Brake pedal de-
pressed4WD shift switch: 4H to 4LO (“Wait” func-
tion is operating.)Battery voltage
Except the above 0V
13 G/B Transfer shift low relay• Vehicle stopped
• Engine running
• A/T selector le-
ver “N” position
• Brake pedal de-
pressed4WD shift switch: 4LO to 4H (“Wait” func-
tion is operating.)Battery voltage
Except the above 0V
33 R/LTransfer shift high relay moni-
tor• Vehicle stopped
• Engine running
• A/T selector le-
ver “N” position
• Brake pedal de-
pressed4WD shift switch: 4H to 4LO (“Wait” func-
tion is operating.)Battery voltage
Except the above 0V

TROUBLE DIAGNOSIS FOR SYSTEM
TF-65
< SERVICE INFORMATION >
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CAUTION:
When using a circuit tester to measure voltage for inspection, be sure not to extend forcibly any connector terminals.
DIAGNOSTIC PROCEDURE
1.CHECK ACTUATOR MOTOR SIGNAL
With CONSULT-II
1. Start engine.
2. Select “DATA MONITOR” mode for “ALL MODE AWD/4WD” with CONSULT-II.
3. Read out the value of “SHIFT ACT1”, “SHIFT AC MON1”,
“SHIFT ACT2” and “SHIFT AC MON2”.
Without CONSULT-II
1. Start engine.
2. Check voltage between transfer control unit harness connector
terminal and ground.
42 P/GTransfer shift low relay moni-
tor• Vehicle stopped
• Engine running
• A/T selector le-
ver “N” position
• Brake pedal de-
pressed4WD shift switch: 4LO to 4H (“Wait” func-
tion is operating.)Battery voltage
Except the above 0V Te r m i n a lWire
colorItem Condition Data (Approx.)
Monitored
itemConditionDisplay
value
SHIFT ACT1• Vehicle stopped
• Engine running
• A/T selector lever “N” posi-
tion
• Brake pedal depressed4WD shift switch: 4H
to 4LO (“Wait” func-
tion is operating.)ON
Except the above OFF
SHIFT AC
MON1• Vehicle stopped
• Engine running
• A/T selector lever “N” posi-
tion
• Brake pedal depressed4WD shift switch: 4H
to 4LO (“Wait” func-
tion is operating.)ON
Except the above OFF
SHIFT ACT2• Vehicle stopped
• Engine running
• A/T selector lever “N” posi-
tion
• Brake pedal depressed4WD shift switch:
4LO to 4H (“Wait”
function is operating.)ON
Except the above OFF
SHIFT AC
MON2• Vehicle stopped
• Engine running
• A/T selector lever “N” posi-
tion
• Brake pedal depressed4WD shift switch:
4LO to 4H (“Wait”
function is operating.)ON
Except the above OFF
PDIA0223E
SDIA2705E

TF-66
< SERVICE INFORMATION >
TROUBLE DIAGNOSIS FOR SYSTEM
OK or NG
OK >> GO TO 7.
NG >> GO TO 2.
2.CHECK ACTUATOR MOTOR POWER SUPPLY 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 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.
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 3.
NG >> Check the following. If any items are damaged, repair or replace damaged parts.
• 20A fuse [No. 57, located in the fuse block (J/B)]. Refer to PG-3
.
Connector Terminal ConditionVoltage
(Approx.)
E1424 -
Ground• Vehicle stopped
• Engine running
• A/T selector lever
“N” position
• Brake pedal de-
pressed4WD shift switch: 4H to
4LO (“Wait” function is
operating.)Battery
voltage
Except the above 0V
13 -
Ground• Vehicle stopped
• Engine running
• A/T selector lever
“N” position
• Brake pedal de-
pressed4WD shift switch: 4LO
to 4H (“Wait” function
is operating.)Battery
voltage
Except the above 0V
E14333 -
Ground• Vehicle stopped
• Engine running
• A/T selector lever
“N” position
• Brake pedal de-
pressed4WD shift switch: 4H to
4LO (“Wait” function is
operating.)Battery
voltage
Except the above 0V
42 -
Ground• Vehicle stopped
• Engine running
• A/T selector lever
“N” position
• Brake pedal de-
pressed4WD shift switch: 4LO
to 4H (“Wait” function
is operating.)Battery
voltage
Except the above 0V
Connector Terminal Voltage (Approx.)
E46 5 - Ground
Battery voltage
E47 5 - Ground
WDIA0310E
Connector Terminal Voltage (Approx.)
E46 5 - Ground
Battery voltage
E47 5 - Ground
WDIA0311E

TROUBLE DIAGNOSIS FOR SYSTEM
TF-67
< SERVICE INFORMATION >
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• Harness for short or open between battery, transfer shift high relay harness connector terminal 5
and transfer shift low relay harness connector terminal 5.
3.CHECK ACTUATOR MOTOR GROUND CIRCUIT
1. Turn ignition switch “OFF”. (Stay for at least 5 seconds.)
2. Remove transfer shift high relay and transfer shift low relay. Refer to TF-22, "
Location of Electrical Parts".
3. Check continuity between transfer shift high relay harness con-
nector E46 terminals 2, 4 (A) and transfer shift low relay harness
connector E47 terminal 2, 4 (B) and ground.
Also check harness for short to ground and short to power.
OK or NG
OK >> GO TO 4.
NG >> Repair open circuit or short to ground or short to power
in harness or connectors.
4.CHECK TRANSFER SHIFT RELAY
1. Turn ignition switch “OFF”.
2. Remove transfer shift high relay and transfer shift low relay. Refer to TF-22, "
Location of Electrical Parts".
3. Apply 12V direct current between transfer shift relay terminals 1
and 2.
4. Check continuity between relay terminals 3 and 4, 3 and 5.
OK or NG
OK >> GO TO 5.
NG >> Replace the transfer shut off relay. Refer to TF-22, "
Location of Electrical Parts".
5.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 the transfer control device (actuator motor) har-
ness connector.
3. Remove transfer shift high relay and transfer shift low relay.
4. Check continuity between the following terminals.
- Transfer control unit harness connector E143 terminal 33 and
transfer control device (actuator motor) harness connector F58
terminal 21.
- Transfer control unit harness connector E143 terminal 42 and
transfer control device (actuator motor) harness connector F58
terminal 24.Continuity should exist.
WDIA0312E
Terminal Condition Continuity
3 - 412V direct current supply between terminals 1 and 2 No
OFF Yes
3 - 512V direct current supply between terminals 1 and 2 Yes
OFF No
WIIA0291E
SDIA2710E

TF-68
< SERVICE INFORMATION >
TROUBLE DIAGNOSIS FOR SYSTEM
- Transfer control unit harness connector E142 terminal 4 and
transfer shift high relay harness connector E46 terminal 1 (A).
- Transfer control unit harness connector E142 terminal 13 and
transfer shift low relay harness connector E47 terminal 1 (B).
- Transfer control unit harness connector E143 terminal 33 and
transfer shift high relay harness connector E46 terminal 3 (A).
- Transfer control unit harness connector E143 terminal 42 and
transfer shift low relay harness connector E47 terminal 3 (B).
Also check harness for short to ground and short to power.
OK or NG
OK >> GO TO 6.
NG >> Repair or replace damaged parts.
6.CHECK ACTUATOR MOTOR
1. Remove transfer control device. Refer to TF-121, "
Removal and Installation".
2. Check operation by applying battery voltage to transfer control
device (actuator motor) terminals 21 and 24.
CAUTION:
• Do not operate actuator motor for more than 1 second.
• Change the actuator motor position to “HIGH” when
installing.
• Be careful not to overheat the harness.
3. Check continuity between transfer control device (actuator
motor) terminals 21 and 24.
OK or NG
OK >> GO TO 7.
NG >> Replace transfer control device (actuator motor). Refer
to TF-121, "
Removal and Installation".
7.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 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.
8.CHECK DTC
WDIA0314E
Continuity should exist.
WDIA0315E
Terminal Actuator motor
21 (Battery voltage) - 24 (Ground) Clockwise rotation
24 (Battery voltage) - 21 (Ground) Counterclockwise rotation
21 - 24 : Approx. 0.2 Ω
WDIA0224E
SDIA2726E

TROUBLE DIAGNOSIS FOR SYSTEM
TF-69
< SERVICE INFORMATION >
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Perform the self-diagnosis, after driving a vehicle for a while.
OK or NG
OK >> Inspection End.
NG >> Replace transfer control unit. Refer to TF-115, "
Removal and Installation".
COMPONENT INSPECTION
Transfer Shift Relay
1. Turn ignition switch “OFF”. (Stay for at least 5 seconds.)
2. Remove transfer shift high relay and transfer shift low relay. Refer to TF-22, "
Location of Electrical Parts".
3. Apply 12V direct current between transfer shift relay terminals 1
and 2.
4. Check continuity between relay terminals 3 and 4, 3 and 5.
5. If NG, replace transfer shift relay.
Transfer Control Device
1. Remove transfer control device. Refer to TF-121, "Removal and Installation".
2. Check operation by applying battery voltage to transfer control
device (actuator motor) terminals 21 and 24.
CAUTION:
• Do not operate actuator motor for more than 1 second.
• Change the actuator motor position to “HIGH” when
installing.
• Be careful not to overheat the harness.
3. Check continuity between transfer control device (actuator
motor) terminals 21 and 24.
4. If NG, replace transfer control device (actuator motor). Refer to
TF-121, "
Removal and Installation".
Actuator Position SwitchINFOID:0000000003532538
CONSULT-II REFERENCE VALUE IN DATA MONITOR MODE
Terminal Condition Continuity
3 - 412V direct current supply between terminals 1 and 2 No
OFF Yes
3 - 512V direct current supply between terminals 1 and 2 Yes
OFF No
WIIA0291E
Terminal Actuator motor
21 (Battery voltage) - 24 (Ground) Clockwise rotate
24 (Battery voltage) - 21 (Ground) Counterclockwise rotate
WDIA0224E
21 - 24 : Approx. 0.2 Ω
SDIA2726E