Page 3209 of 3419

TF-66
TROUBLE DIAGNOSIS FOR SYSTEM
Revision: October 20052005 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 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
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
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
colorItem Condition Data (Approx.)
43 G/Y Wait detection switch
Vehicle stopped
Engine running
A/T selector
lever “N” position
Brake pedal
depressed4WD 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
Page 3210 of 3419

TROUBLE DIAGNOSIS FOR SYSTEM
TF-67
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TF
Revision: October 20052005 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 (G/Y) and wait detection switch harness
connector F59 terminal 10 (G/Y).
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 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
ConnectorTe r m i n a l
(Wire
color)ConditionVoltage
(Approx.)
E14343 (G/Y)
- Ground
Vehicle stopped
Engine running
A/T selector lever
“N” position
Brake pedal
depressed4WD shift switch:
2WD, AUTO or 4HBattery
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 0V
SDIA2701E
Continuity should exist.
SDIA2702E
Page 3211 of 3419

TF-68
TROUBLE DIAGNOSIS FOR SYSTEM
Revision: October 20052005 QX56
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 (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 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" .
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-54, "
TRANSFER CONTROL UNIT TERMINALS
AND REFERENCE 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-132, "
Removal and Installation" . Continuity should exist.
SDIA2703E
Terminal Condition Continuity
10 - 11Push wait detection switch Yes
Release wait detection switch No
SDIA2704E
Page 3212 of 3419

TROUBLE DIAGNOSIS FOR SYSTEM
TF-69
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Revision: October 20052005 QX56
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)EDS002IB
DIAGNOSTIC PROCEDURE
1. CHECK DTC WITH TCM
Perform self-diagnosis with TCM. Refer to TF-50, "
SELF-DIAGNOSTIC PROCEDURE (WITH CONSULT-II)" .
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-36, "
Transfer Control Unit Input/Output Signal Ref-
erence Values" .
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 TCM again. Refer to TF-50, "
SELF-DIAGNOSTIC PROCEDURE
(WITH CONSULT-II)" .
Terminal Condition Continuity
10 - 11Push wait detection switch Yes
Release wait detection switch No
SDIA2704E
Page 3213 of 3419

TF-70
TROUBLE DIAGNOSIS FOR SYSTEM
Revision: October 20052005 QX56
Actuator MotorEDS002IC
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 Condition Display value
SHIFT ACT1 [ON/OFF]Output condition to
actuator motor (High)
Vehicle stopped
Engine running
A/T selector lever “N”
position
Brake pedal depressed4WD 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 depressed4WD 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 depressed4WD 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 depressed4WD shift switch: 4LO to
4H (“Wait” function is
operating.)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
lever “N” position
Brake pedal
depressed4WD 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
depressed4WD 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
lever “N” position
Brake pedal
depressed4WD shift switch: 4H to 4LO (“Wait” func-
tion is operating.)Battery voltage
Except the above 0V
42 P/GTransfer shift low relay moni-
tor
Vehicle stopped
Engine running
A/T selector
lever “N” position
Brake pedal
depressed4WD shift switch: 4LO to 4H (“Wait” func-
tion is operating.)Battery voltage
Except the above 0V
Page 3214 of 3419

TROUBLE DIAGNOSIS FOR SYSTEM
TF-71
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TF
Revision: October 20052005 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
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 operat-
ing.)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 operat-
ing.)ON
Except the above OFF
ConnectorTe r m i n a l
(Wire
color)ConditionVoltage
(Approx.)
E1424 (Y/L) -
Ground
Vehicle stopped
Engine running
A/T selector lever
“N” position
Brake pedal
depressed4WD shift switch: 4H
to 4LO (“Wait” function
is operating.)Battery
voltage
Except the above 0V
13 (G/B)
- Ground
Vehicle stopped
Engine running
A/T selector lever
“N” position
Brake pedal
depressed4WD shift switch: 4LO
to 4H (“Wait” function
is operating.)Battery
voltage
Except the above 0V
PDIA0223E
SDIA2705E
Page 3215 of 3419

TF-72
TROUBLE DIAGNOSIS FOR SYSTEM
Revision: October 20052005 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 (R), transfer shift low relay harness connector
E47 terminal 5 (R) 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 (R), transfer shift low relay harness connector
E47 terminal 5 (R) 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 (R/L) -
Ground
Vehicle stopped
Engine running
A/T selector lever
“N” position
Brake pedal
depressed4WD shift switch: 4H
to 4LO (“Wait” function
is operating.)Battery
voltage
Except the above 0V
42 (P/G)
- Ground
Vehicle stopped
Engine running
A/T selector lever
“N” position
Brake pedal
depressed4WD shift switch: 4LO
to 4H (“Wait” function
is operating.)Battery
voltage
Except the above 0V ConnectorTe r m i n a l
(Wire
color)ConditionVoltage
(Approx.)
Connector Terminal (Wire color) Voltage (Approx.)
E46 5 (R) - Ground
Battery voltage
E47 5 (R) - Ground
SDIA2707E
Connector Terminal (Wire color) Voltage (Approx.)
E46 5 (R) - Ground
Battery voltage
E47 5 (R) - Ground
SDIA2706E
Page 3216 of 3419

TROUBLE DIAGNOSIS FOR SYSTEM
TF-73
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Revision: October 20052005 QX56
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 1 (B/W), 4 (B), transfer shift low relay har-
ness connector E47 terminal 1 (B/W), 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.Continuity should exist.
SDIA2708E
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
LDIA0099E