TROUBLE DIAGNOSIS FOR SYSTEM
TF-61
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2.CHECK 4WD SHIFT SWITCH POWER SUPPLY CIRCUIT
1. Turn ignition switch “OFF”. (Stay for at least 5 seconds.)
2. Disconnect 4WD shift switch harness connector.
3. Check voltage between 4WD shift switch harness connector ter-
minal 1 and ground.
4. Turn ignition switch “ON”. (Do not start engine.)
5. Check voltage between 4WD shift switch harness connector ter-
minal 1 and ground.
OK or NG
OK >> GO TO 3.
NG >> 1. Check harness for short or open between 4WD shift
switch harness connector M51 terminal 1 and transfer
shut off relay 2 harness connector E85 terminal 5 and
10A fuse (No. 64 located in the fuse and relay box). If any items are damaged, repair or replace
damaged parts.
2. Perform trouble diagnosis for power supply circuit. Refer toTF-52, "
Power Supply Circuit For
Transfer Control Unit".
3.CHECK HARNESS BETWEEN 4WD SHIFT SWITCH AND TRANSFER CONTROL UNIT
1. Turn ignition switch “OFF”. (Stay for at least 5 seconds.)
2. Disconnect transfer control unit harness connector and the 4WD shift switch harness connector.
3. Check continuity between the following terminals.
–Transfer control unit harness connector M105 terminal 14 and
4WD shift switch harness connector M51 terminal 3.
–Transfer control unit harness connector M105 terminal 15 and
4WD shift switch harness connector M51 terminal 5.
–Transfer control unit harness connector M105 terminal 16 and
4WD shift switch harness connector M51 terminal 6.
Also check harness for short to ground and short to power.
OK or NG
OK >> GO TO 4.
NG >> Repair or replace damaged parts.
Connector Terminal Voltage (Approx.)
M51 1 - Ground 0V
SDIA2803E
Connector Terminal Voltage (Approx.)
M51 1 - Ground Battery voltage
SDIA2802E
Continuity should exist.
SDIA3366E
TROUBLE DIAGNOSIS FOR SYSTEM
TF-63
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Wait Detection SwitchEDS00324
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
WAIT DETCT SW [ON/
OFF]Condition of wait detection
switch
lVehicle stopped
lEngine running
lFor A/T models, A/T
selector lever “N” posi-
tion with brake pedal
depressed.
lFor M/T models, M/T
shift lever neutral posi-
tion with clutch and
brake pedal depressed.4WD shift switch:
4H and 4LOON
4WD shift switch: 2WD OFF
TerminalWire
colorItem Condition Data (Approx.)
17 O Wait detection switch
lVehicle stopped
lEngine running
lFor A/T models,
A/T selector
lever “N” position
with brake pedal
depressed.
lFor M/T models,
M/T shift lever
neutral position
with clutch and
brake pedal
depressed.4WD shift switch: 4H and 4LO 0V
4WD shift switch: 2WD Battery voltage
TF-64
TROUBLE DIAGNOSIS FOR SYSTEM
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.
Condition Display value
lVehicle stopped
lEngine running
lFor A/T models, A/T selector
lever “N” position with brake
pedal depressed.
lFor M/T models, M/T shift
lever neutral position with
clutch and brake pedal
depressed.4WD shift switch: 4H and 4LO ON
4WD shift switch: 2WD OFF
PDIA0221E
Connector Terminal ConditionVoltage
(Approx.)
M10517 -
Ground
lVehicle stopped
lEngine running
lFor A/T models,
A/T selector lever
“N” position with
brake pedal
depressed.
lFor M/T models,
M/T shift lever
neutral position
withclutchand
brake pedal
depressed.4WD shift switch:
4H and 4LO0V
4WD shift switch: 2WDBattery
voltage
SDIA3367E
TROUBLE DIAGNOSIS FOR SYSTEM
TF-67
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Actuator MotorEDS00326
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 ACT 1 [ON/OFF]Output condition to actua-
tor motor (clockwise)
lVehicle stopped
lEngine running
lFor A/T models, A/T
selector lever “N” posi-
tion with brake pedal
depressed.
lFor M/T models, M/T
shift lever neutral posi-
tion with clutch and
brake pedal depressed.4WD shift switch:
2WDto4Hor4Hto4LO
or 2WD to 4LOON
Except the above OFF
SHIFT AC MON1 [ON/
OFF]Check signal for transfer
control unit signal output4WD shift switch:
2WDto4Hor4Hto4LO
or 2WD to 4LOON
Except the above OFF
SHIFT ACT 2 [ON/OFF]Output condition to actua-
tor motor (counterclock-
wise)4WD shift switch:
4LO to 4H or 4H to 2WD
or 4LO to 2WDON
Except the above OFF
SHIFT AC MON2 [ON/
OFF]Check signal for transfer
control unit signal output4WD shift switch:
4LO to 4H or 4H to 2WD
or 4LO to 2WDON
Except the above OFF
TerminalWire
colorItem Condition Data (Approx.)
27 L Actuator motor power supplyIgnition switch: ON Battery voltage
Ignition switch: OFF
(5 seconds after ignition switch is turned OFF)0V
28 BR Actuator motor (+)
lVehicle stopped
lEngine running
lFor A/T models,
A/T selector
lever “N” position
with brake pedal
depressed.
lFor M/T models,
M/T shift lever
neutral position
with clutch and
brake pedal
depressed.When 4WD shift switch is operated
(while actuator motor is operating)Battery voltage
®0V
When 4WD shift switch is not operated 0V
31 G Actuator motor (-) Always 0V
42 LG Transfer shift high relay4WD shift switch:
2WD to 4H or 4H to 4LO or 2WD to 4LO0V
Except the above Battery voltage
47 OTransfer shift high relay moni-
tor4WD shift switch:
2WD to 4H or 4H to 4LO or 2WD to 4LO
(while actuator motor is operating)Battery voltage
®0V
Except the above 0V
48 RTransfer shift low relay moni-
tor4WD shift switch:
4LO to 4H or 4H to 2WD or 4LO to 2WD
(while actuator motor is operating)Battery voltage
®0V
Except the above 0V
50 Y Transfer shift low relay4WD shift switch:
4LO to 4H or 4H to 2WD or 4LO to 2WD0V
Except the above Battery voltage
TROUBLE DIAGNOSIS FOR SYSTEM
TF-69
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OK or NG
OK >> GO TO 9.
NG >> GO TO 2.
Connector Terminal ConditionVoltage
(Approx.)
M10628 -
GroundWhen 4WD shift switch is operated
(While actuator motor is operating.)Battery
voltage®
0V
When 4WD shift switch is not operated 0V
31 -
GroundAlways 0V
42 -
Ground
lVe h ic le
stopped
lEngine run-
ning
lFor A/T
models, A/T
selector
lever “N”
position with
brake pedal
depressed.
lFor M/T
models, M/T
shift lever
neutral posi-
tion with
clutch and
brake pedal
depressed.4WD shift switch:
2WDto4Hor4Hto4LOor
2WD to 4LO0V
Except the aboveBattery
voltage
47 -
Ground4WD shift switch:
2WDto4Hor4Hto4LOor
2WD to 4LO
(while actuator motor is
operating)Battery
voltage®
0V
Except the above 0V
48 -
Ground4WD shift switch:
4LO to 4H or 4H to 2WD or
4LO to 2WD
(while actuator motor is
operating)Battery
voltage®
0V
Except the above 0V
50 -
Ground4WD shift switch:
4LO to 4H or 4H to 2WD or
4LO to 2WD0V
Except the aboveBattery
voltage
TF-70
TROUBLE DIAGNOSIS FOR SYSTEM
2.CHECK ACTUATOR MOTOR POWER SUPPLY CIRCUIT
1. Turn ignition switch “OFF”. (Stay for at least 5 seconds.)
2. Disconnect transfer control unit harness connector.
3. Check voltage between transfer control unit harness connector
M106 terminal 27 and ground.
4. Turn ignition switch “ON”.
5. Check voltage between transfer control unit harness connector
M106 terminal 27 and ground.
OK or NG
OK >> GO TO 3.
NG >> 1. Check harness for short or open between transfer
control unit harness connector M106 terminal 27 and
transfer shut off relay 2 harness connector E85 termi-
nal 5 and 10A fuse (No. 63, located in the fuse and relay box). If any items are damaged, repair
or replace damaged parts.
2. Perform trouble diagnosis for power supply circuit. Refer toTF-52, "
Power Supply Circuit For
Transfer Control Unit".
Connector Terminal Voltage (Approx.)
M106 27 - Ground 0V
SDIA2808E
Connector Terminal Voltage (Approx.)
M106 27 - Ground Battery voltage
SDIA2807E
TROUBLE DIAGNOSIS FOR SYSTEM
TF-71
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3.CHECK TRANSFER SHIFT RELAY 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. Refer toTF-21, "
Location of Electrical Parts".
3. Check voltage between transfer control unit harness connector
terminal and ground.
4. Turn ignition switch “ON”. (Do not start engine.)
5. Check voltage between transfer control unit harness connector
terminal and ground.
OK or NG
OK >> GO TO 4.
NG >> Check the following. If any items are damaged, repair or
replace damaged parts.
lHarness for short or open between transfer control unit harness connector terminal 27 and
transfer shift high relay harness connector E27 terminal 2.
lHarness for short or open between transfer control unit harness connector terminal 27 and
transfer shift low relay harness connector terminal E29 terminal 2.
4.CHECK 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.
3. Apply 12V direct current between transfer shift high relay and
transfer shift low 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 transfer shift high relay or transfer shift low relay.
Connector Terminal Voltage (Approx.)
E27 2 - Ground
0V
E29 2 - Ground
SDIA3384E
Connector Terminal Voltage (Approx.)
E27 2 - Ground
Battery voltage
E29 2 - Ground
SDIA3385E
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
TROUBLE DIAGNOSIS FOR SYSTEM
TF-73
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7.CHECK ACTUATOR MOTOR OPERATION CIRCUIT
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. Refer toTF-21, "
Location of Electrical Parts".
4. Check continuity between the following terminals.
–Transfer control unit harness connector M106 terminal 47 and
transfer control device (actuator motor) harness connector F47
terminal 23.
–Transfer control unit harness connector M106 terminal 48 and
transfer control device (actuator motor) harness connector F47
terminal 24.
–Transfer control device (actuator motor) harness connector F47
terminal 24 and transfer shift high relay harness connector E27
terminal 3.
–Transfer control device (actuator motor) harness connector F47
terminal 23 and transfer shift low relay harness connector E29
terminal 3.
Also check harness for short to ground and short to power.
OK or NG
OK >> GO TO 8.
NG >> Repair or replace damaged parts.
8.CHECK ACTUATOR MOTOR
1. Remove transfer control device. Refer toTF-105, "
Removal and Installation".
2. Check operation by applying battery voltage to transfer control
device (actuator motor) terminals 23 and 24.
CAUTION:
Be careful not to overheat the harness.
Does actuator motor rotate?
YES >> GO TO 9.
NO >> Replace transfer control device (actuator motor). Refer
toTF-105, "
Removal and Installation".
9.CHECK TRANSFER CONTROL UNIT
Check transfer control unit input/output signal. Refer toTF-38, "
Transfer Control Unit Input/Output Signal Ref-
erence Values".
OK or NG
OK >> GO TO 10.
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.
SDIA2811E
Continuity should exist.
SDIA3394E
Terminal Actuator motor
24 (Battery voltage) - 23 (Ground) Clockwise rotate
23 (Battery voltage) - 24 (Ground) Counterclockwise rotate
SDIA2386E