2006 INFINITI QX56 battery

TF-66
TROUBLE DIAGNOSIS FOR SYSTEM
Revision: November 20092006 QX56
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 SwitchEDS002IA
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.
CAUTION:
When using a circuit tester to measure voltage for inspection, be sure not to extend forcibly any connector terminals. Connector Terminal
ConditionContinuity
M141 1 - 2
4WD shift switch: 2WD
Yes
4WD shift switch: AUTO, 4H and
4LO No
1 - 3 4WD shift switch: AUTO
Yes
4WD shift switch: 2WD, 4H and
4LO No
1 - 4 4WD shift switch: 2WD
No
4WD shift switch: AUTO, 4H and
4LO Ye s
1 - 5 4WD shift switch: 4H
Yes
4WD shift switch: 2WD, AUTO,
and 4LO No
1 - 6 4WD shift switch: 4LO
Yes
4WD shift switch: 2WD, AUTO
and 4H No
WDIA0205E
Monitored item
Content ConditionDisplay value
WAIT DETCT SW [ON/
OFF] Condition of wait detection
switch

Vehicle stopped

Engine running

A/T selector lever
“N ”
position

Brake pedal depressed 4WD shift switch: 2WD,
AUTO or 4H
OFF
4WD shift switch: 4H to
4LO (While actuator
motor 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
color Item
ConditionData (Approx.)
43 G/Y Wait detection switch

Vehicle stopped

Engine running

A/T selector
lever “N ” position

Brake pedal
depressed 4WD shift switch: 2WD, AUTO or 4H Battery voltage
4WD shift switch: 4H to 4LO (While actua-
tor motor is operating.)
Battery volt-
age
→ 0V
4WD shift switch: 4LO to 4H (While actua-
tor motor is operating.) 0V
→ Battery
voltage
4WD shift switch: 4LO 0V

TROUBLE DIAGNOSIS FOR SYSTEMTF-67
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TF
Revision: November 2009 2006 QX56
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.
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.
Condition Display value

Vehicle stopped

Engine running

A/T selector lever “N” position

Brake pedal depressed 4WD shift switch: 2WD, AUTO
or 4H
OFF
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
Connector Terminal ConditionVoltage
(Approx.)
E143 43 -
Ground

Vehicle stopped

Engine running

A/T selector lever
“ N ” position

Brake pedal
depressed 4WD 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 actuator
motor is operating.) 0V
→
Battery
voltage
4WD shift switch: 4LO 0VSDIA2701E
Continuity should exist.
SDIA2702E

TF-70
TROUBLE DIAGNOSIS FOR SYSTEM
Revision: November 20092006 QX56
Actuator MotorEDS003B2
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.
CAUTION:
When using a circuit tester to measure voltage for inspection, be sure not to extend forcibly any connector terminals.Monitored item
Content ConditionDisplay value
SHIFT ACT1 [ON/OFF] Output condition to
actuator motor (High)

Vehicle stopped

Engine running

A/T selector lever “
N”
position

Brake pedal depressed 4WD shift switch: 4H to
4LO (
“Wait ” function is
operating.) 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 depressed 4WD shift switch: 4H to
4LO (
“Wait ” function is
operating.) ON
Except the above OFF
SHIFT ACT2 [ON/OFF] Output condition to
actuator motor (Low)

Vehicle stopped

Engine running

A/T selector lever “
N”
position

Brake pedal depressed 4WD shift switch: 4LO to
4H (
“Wait ” function is
operating.) 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 depressed 4WD shift switch: 4LO to
4H (
“Wait ” function is
operating.) ON
Except the above OFF
Te r m i n a lWire
color Item
ConditionData (Approx.)
4 Y/L Transfer shift high relay

Vehicle stopped

Engine running

A/T selector
lever “N ” position

Brake pedal
depressed 4WD 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
lever “N ” position

Brake pedal
depressed 4WD shift switch: 4LO to 4H (
“Wait ” func-
tion is operating.) Battery voltage
Except the above 0V
33 R/L Transfer shift high relay moni-
tor

Vehicle stopped

Engine running

A/T selector
lever
“N ” position

Brake pedal
depressed 4WD shift switch: 4H to 4LO (
“Wait ” func-
tion is operating.) Battery voltage
Except the above 0V
42 P/G Transfer shift low relay moni-
tor

Vehicle stopped

Engine running

A/T selector
lever
“N ” position

Brake pedal
depressed 4WD shift switch: 4LO to 4H (
“Wait ” func-
tion is operating.) Battery voltage
Except the above 0V

TROUBLE DIAGNOSIS FOR SYSTEMTF-71
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TF
Revision: November 2009 2006 QX56
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.
Monitored
item Condition Display
value
SHIFT ACT1

Vehicle stopped

Engine running

A/T selector lever “N ” posi-
tion

Brake pedal depressed 4WD 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 depressed 4WD 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 depressed 4WD shift switch:
4LO to 4H (
“Wait ”
function is operat-
ing.) ON
Except the above OFF
SHIFT AC
MON2

Vehicle stopped

Engine running

A/T selector lever “N ” posi-
tion

Brake pedal depressed 4WD shift switch:
4LO to 4H (
“Wait ”
function is operat-
ing.) ON
Except the above OFF
Connector Terminal ConditionVoltage
(Approx.)
E142 4 -
Ground

Vehicle stopped

Engine running

A/T selector lever
“ N ” position

Brake pedal
depressed 4WD 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
depressed 4WD shift switch: 4LO
to 4H (
“Wait ” function
is operating.) Battery
voltage
Except the above 0V
PDIA0223E
SDIA2705E

TF-72
TROUBLE DIAGNOSIS FOR SYSTEM
Revision: November 20092006 QX56
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-4, "POWER SUPPLY ROUTING
CIRCUIT" .

Harness for short or open between battery, transfer shift high relay harness connector terminal
5 and transfer shift low relay harness connector terminal 5.
E14333 -
Ground

Vehicle stopped

Engine running

A/T selector lever
“ N ” position

Brake pedal
depressed 4WD 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
depressed 4WD shift switch: 4LO
to 4H (
“Wait ” function
is operating.) Battery
voltage
Except the above 0V
Connector Terminal
ConditionVoltage
(Approx.)
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 SYSTEMTF-75
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Revision: November 2009 2006 QX56
6. CHECK ACTUATOR MOTOR
1. Remove transfer control device. Refer to TF-138, "
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-138, "
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 Values" .
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
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-132, "
Removal and Installation" .
TerminalActuator motor
21 (Battery voltage) - 24 (Ground) Clockwise rotation
24 (Battery voltage) - 21 (Ground) Counterclockwise rotation
21 - 24 : Approx. 0.2 \b
WDIA0224E
SDIA2726E

TF-76
TROUBLE DIAGNOSIS FOR SYSTEM
Revision: November 20092006 QX56
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-138, "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-138, "
Removal and Installation" .
Terminal ConditionContinuity
3 - 4 12V direct current supply between terminals 1 and 2 No
OFF
Yes
3 - 5 12V direct current supply between terminals 1 and 2 Yes
OFF
No
WIIA0291E
TerminalActuator motor
21 (Battery voltage) - 24 (Ground) Clockwise rotate
24 (Battery voltage) - 21 (Ground) Counterclockwise rotate
21 - 24 : Approx. 0.2 \b
WDIA0224E
SDIA2726E

TROUBLE DIAGNOSIS FOR SYSTEMTF-77
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Revision: November 2009 2006 QX56
Actuator Position SwitchEDS002ID
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.
CAUTION:
When using a circuit tester to measure voltage for inspection, be sure not to extend forcibly any connector terminals.Monitored item [Unit]
Content ConditionDisplay value
SHIFT POS SW1 [ON/
OFF] Condition of actuator posi-
tion switch 1
(Low)

Vehicle stopped

Engine running

A/T selector lever “
N”
position

Brake pedal depressed 4WD shift switch: 4LO
ON
4WD shift switch: 2WD,
AUTO or 4H OFF
SHIFT POS SW2 [ON/
OFF] Condition of actuator posi-
tion switch 2
(High)

Vehicle stopped

Engine running

A/T selector lever “
N”
position

Brake pedal depressed 4WD shift switch: 4H,
AUTO or 2WD
ON
4WD shift switch: 4LO OFF
Terminal Wire
color Item
ConditionData (Approx.)
27 W/L Actuator position switch 2
(High)

Vehicle stopped

Engine running

A/T selector
lever
“N ” position

Brake pedal
depressed 4WD shift switch: 4H, AUTO or 2WD 0V
4WD shift switch: 4LO
Battery voltage
44 LG/B Actuator position switch 1
(Low)

Vehicle stopped

Engine running

A/T selector
lever
“N ” position

Brake pedal
depressed 4WD shift switch: 4LO
0V
4WD shift switch: 2WD, AUTO or 4H Battery voltage