Page 3249 of 3419

TF-106
TROUBLE DIAGNOSIS FOR SYSTEM
Revision: October 20052005 QX56
DIAGNOSTIC PROCEDURE
1. CHECK CLUTCH PRESSURE SWITCH SIGNAL
With CONSULT-II
1. Start engine.
2. Select “DATA MONITOR” mode for “ALL MODE AWD/4WD” with CONSULT-II.
3. Read out ON/OFF switching action of the “CL PRES SW” while
operating 4WD shift switch.
Without CONSULT-II
1. Start engine.
2. Check voltage between transfer control unit harness connector
terminals and ground.
OK or NG
OK >> GO TO 5.
NG >> GO TO 2.
2. CHECK HARNESS BETWEEN TRANSFER CONTROL UNIT AND CLUTCH PRESSURE SWITCH
1. Turn ignition switch “OFF”. (Stay for at least 5 seconds.)
2. Disconnect transfer control unit harness connector and the transfer terminal cord assembly harness con-
nector.
3. Check continuity between transfer control unit harness connec-
tor E143 terminal 34 (BR) and transfer terminal cord assembly
harness connector F56 terminal 7 (BR)
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
Ignition switch: ON
A/T selector lever “D”
position4WD shift switch: AUTO or 4H
(“Wait” function is not operating.)ON
Ignition switch: ON4WD shift switch: 2WD (“Wait”
function is not operating.)OFF
ConnectorTerminal
(Wire
color)ConditionVoltage
(Approx.)
E14334 (BR) -
Ground
Ignition switch: ON
A/T selector lever
“D” position4WD shift switch:
AUTO or 4H
(“Wait” function is
not operating.)0V
Ignition switch: ON4WD shift switch:
2WD (“Wait” func-
tion is not operat-
ing.)Battery
voltage
WDIA0141E
SDIA2746E
Continuity should exist.
SDIA2747E
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TROUBLE DIAGNOSIS FOR SYSTEM
TF-107
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Revision: October 20052005 QX56
3. 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 4.
NG >> Check transfer control unit pin terminals for damage or loose connection with the harness connec-
tor. If any items are damaged, repair or replace damaged parts.
4. CHECK CLUTCH PRESSURE SWITCH
1. Turn ignition switch “OFF”. (Stay for at least 5 seconds.)
2. Remove clutch pressure switch. Refer to TF-22, "
Location of Electrical Parts" .
3. Push and release clutch pressure switch and check continuity
between transfer terminal cord assembly terminal 7 and ground.
OK or NG
OK >> GO TO 5.
NG >> Replace clutch pressure switch. Refer to TF-22, "
Loca-
tion of Electrical Parts" .
5. CHECK DTC
Perform the self-diagnosis, after driving a vehicle for a while.
OK or NG
OK >> GO TO 6.
NG >> Replace transfer control unit. Refer to TF-132, "
Removal and Installation" .
6. CRUISE TEST
Perform cruise test. Refer to TF-34, "
CRUISE TEST" .
OK or NG
OK >> Inspection End.
NG >> Perform the applicable trouble diagnosis.
COMPONENT INSPECTION
1. Turn ignition switch “OFF”. (Stay for at least 5 seconds.)
2. Remove clutch pressure switch. Refer to TF-22, "
Location of Electrical Parts" .
3. Push and release clutch pressure switch and check continuity
between transfer terminal cord assembly terminal 7 and ground.
4. If NG, replace the clutch pressure switch. Refer to TF-22, "
Loca-
tion of Electrical Parts" .
Terminal Condition Continuity
7 -
GroundPush clutch pressure switch Yes
Release clutch pressure switch No
WDIA0171E
Terminal Condition Continuity
7 - GroundPush clutch pressure switch Yes
Release clutch pressure switch No
WDIA0171E
Page 3251 of 3419

TF-108
TROUBLE DIAGNOSIS FOR SYSTEM
Revision: October 20052005 QX56
Line Pressure SwitchEDS0 02 IL
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 Condition Display value
LINE PRES SW [ON/
OFF]Condition of line pressure
switch
A/T selector lever “D” position
4WD shift switch: 2WD, AUTO or 4HON
Except the above
The vehicle has been
left at room tempera-
ture for 5 minutes and
more with ignition
switch in “OFF” posi-
tion.Ignition switch: ON
A/T selector lever: "P"
or "N" position
4WD shift switch: other
than AUTOOFF
TerminalWire
colorItem Condition Data (Approx.)
35 BR/W Line pressure switch
Ignition switch: ON
A/T selector lever “D” posi-
tion4WD shift switch: AUTO 0V
Except the above
The vehicle has been left at
room temperature for 5 min-
utes and more with ignition
switch in “OFF” position.
Ignition switch: ON
A/T selector lever: "P" or "N"
position
4WD shift switch: other than
AUTOBattery voltage
Page 3252 of 3419

TROUBLE DIAGNOSIS FOR SYSTEM
TF-109
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Revision: October 20052005 QX56
DIAGNOSTIC PROCEDURE
1. CHECK LINE PRESSURE SWITCH SIGNAL
With CONSULT-II
1. Start engine.
2. Select “DATA MONITOR” mode for “ALL MODE AWD/4WD” with CONSULT-II.
3. Read out ON/OFF switching action of “LINE PRES SW” while
operating 4WD shift switch.
Without CONSULT-II
1. Start engine.
2. Check voltage between transfer control unit harness connector
terminals and ground.
OK or NG
OK >> GO TO 5.
NG >> GO TO 2.
2. CHECK HARNESS BETWEEN TRANSFER CONTROL UNIT AND LINE PRESSURE SWITCH
1. Turn ignition switch “OFF”. (Stay for at least 5 seconds.)
2. Disconnect transfer control unit harness connector and the transfer terminal cord assembly harness con-
nector.
3. Check continuity between transfer control unit harness connec-
tor E143 terminal 35 (BR/W) and transfer terminal cord assem-
bly harness connector F56 terminal 1 (BR/W).
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
A/T selector lever “D” position
4WD shift switch: AUTOON
Except the above
The vehicle has been left
at room temperature for 5
minutes and more with
ignition switch in “OFF”
position.Ignition switch: ON
A/T selector lever: "P" or "N"
position
4WD shift switch: other than
AUTOOFF
ConnectorTe r m i n a l
(Wire
color)ConditionVoltage
(Approx.)
E14335 (BR/
W) -
Ground
A/T selector lever
“D” position4WD shift switch:
AUTO0V
Except the above
The vehicle has
been left at room
temperature for 5
minutes and more
with ignition switch
in “OFF” position.
Ignition switch:
ON
A/T selector
lever: "P" or "N"
position
4WD shift
switch: other
than AUTOBattery
voltage
WDIA0142E
SDIA2751E
Continuity should exist.
SDIA2752E
Page 3253 of 3419

TF-110
TROUBLE DIAGNOSIS FOR SYSTEM
Revision: October 20052005 QX56
3. 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 4.
NG >> Check the following. If any items are damaged, repair or replace damaged parts.
Transfer control unit pin terminals for damage or loose connection with harness connector.
Transfer control unit. Refer to TF-132, "Removal and Installation" .
4. CHECK LINE PRESSURE SWITCH
1. Turn ignition switch “OFF”. (Stay for at least 5 seconds.)
2. Remove line pressure switch. Refer to TF-22, "
Location of Electrical Parts" .
3. Push and release line pressure switch and check continuity
between transfer terminal cord assembly terminal 1 and ground.
OK or NG
OK >> GO TO 5.
NG >> Replace line pressure switch. Refer to TF-22, "
Location
of Electrical Parts" .
5. CHECK DTC
Perform the self-diagnosis, after driving a vehicle for a while.
OK or NG
OK >> GO TO 6.
NG >> Replace transfer control unit. Refer to TF-132, "
Removal and Installation" .
6. CRUISE TEST
Perform cruise test. Refer to TF-34, "
CRUISE TEST" .
OK or NG
OK >> INSPECTION END.
NG >> Perform the applicable trouble diagnosis.
COMPONENT INSPECTION
1. Turn ignition switch “OFF”. (Stay for at least 5 seconds.)
2. Remove line pressure switch. Refer to TF-22, "
Location of Electrical Parts" .
3. Push and release line pressure switch and check continuity
between transfer terminal cord assembly terminal 1 and ground.
4. If NG, replace the line pressure switch. Refer to TF-22, "
Loca-
tion of Electrical Parts" .
Terminal Condition Continuity
1 -
GroundPush line pressure switch Yes
Release line pressure switch No
WDIA0172E
Terminal Condition Continuity
1 - GroundPush line pressure switch Yes
Release line pressure switch No
WDIA0172E
Page 3254 of 3419

TROUBLE DIAGNOSIS FOR SYSTEM
TF-111
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Revision: October 20052005 QX56
Throttle Position Signal (ECM)EDS002IM
DIAGNOSTIC PROCEDURE
1. CHECK DTC WITH ECM
Perform self-diagnosis with ECM. Refer to EC-130, "
SELF-DIAG RESULTS MODE" .
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 ECM again. Refer to EC-130, "
SELF-DIAG RESULTS MODE" .
ABS Operation Signal (ABS)EDS002IN
DIAGNOSTIC PROCEDURE
1. CHECK DTC WITH ABS ACTUATOR AND ELECTRIC UNIT (CONTROL UNIT)
Perform self-diagnosis with ABS actuator and electric unit (control unit). Refer to BRC-29, "
SELF-DIAGNO-
SIS" .
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 ABS actuator and electric unit (control unit) again. Refer to BRC-29,
"SELF-DIAGNOSIS" .
Page 3255 of 3419

TF-112
TROUBLE DIAGNOSIS FOR SYSTEM
Revision: October 20052005 QX56
VDC Operation Signal (ABS)EDS002IO
DIAGNOSTIC PROCEDURE
1. CHECK DTC WITH ABS ACTUATOR AND ELECTRIC UNIT
Perform self-diagnosis with ABS actuator and electric unit (control unit). Refer to BRC-29, "
SELF-DIAGNO-
SIS" .
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 ABS actuator electric unit (control unit) again. Refer to BRC-29,
"SELF-DIAGNOSIS" .
TCS Operation Signal (ABS)EDS002IP
DIAGNOSTIC PROCEDURE
1. CHECK DTC WITH ABS ACTUATOR AND ELECTRIC UNIT (CONTROL UNIT)
Perform self-diagnosis with ABS actuator and electric unit (control unit). Refer to BRC-29, "
SELF-DIAGNO-
SIS" .
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 ABS actuator and electric unit (control unit) again. Refer to BRC-29,
"SELF-DIAGNOSIS" .
Page 3256 of 3419

TROUBLE DIAGNOSIS FOR SYSTEM
TF-113
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Revision: October 20052005 QX56
CAN Communication LineEDS002IQ
DIAGNOSTIC PROCEDURE
1. CHECK CAN COMMUNICATION CIRCUIT
With CONSULT-II
1. Turn ignition switch “ON” and start engine.
2. Select “SELF-DIAG RESULTS” mode for “ALL MODE AWD/4WD” within CONSULT-II.
3. Perform the self-diagnosis.
Is the
“CAN COMM CIRCUIT [U1000]” displayed?
YES >> Print CONSULT-II screen and go to LAN-3, "Precautions
When Using CONSULT-II" .
NO >> Inspection End.
ATP SwitchEDS002IR
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.
SDIA1850E
Monitored item [Unit] Content Condition Display value
ATP SWITCH [ON/OFF] Condition of ATP switch
Vehicle stopped
Engine running
A/T selector lever “N"
Brake pedal depressed4WD shift switch
: 4H to 4LO or 4LO to 4H
(While actuator motor is
operating.) ON
Except the above OFF
Te r m i n a lWire
colorItem Condition Data (Approx.)
40 L ATP switch
Vehicle stopped
Engine running
A/T selector
lever “N"
Brake pedal
depressed4WD shift switch: 4H to 4LO or 4LO to 4H
(While actuator motor is operating.)0V
Except the above Battery voltage