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TF-84
SHIFT ACTUATOR CIRCUIT
Revision: August 20072004 QX56
6. CHECK INPUT SIGNAL
Without CONSULT-II
1. Start engine (idling).
2. Check voltage between transfer control unit harness connector
E142 terminal 4 (Y/L) [or 13 (G/B)] and ground while 4WD shift
switch is set from 4H to 4LO (or from 4LO to 4H).
3. Result
OK or NG
OK >> GO TO 8.
NG >> GO TO 7.
7. CHECK HARNESS CONTINUITY BETWEEN TRANSFER CONTROL UNIT AND TRANSFER SHIFT
HIGH AND LOW RELAYS
OK or NG
OK >> GO TO 8.
NG >> Repair and replace harness connector between transfer control unit and transfer shift HIGH or
LOW relay.
8. PERFORM SELF-DIAGNOSIS AGAIN
After driving for a while, perform self-diagnosis again.
Refer to TF-27, "
Trouble Diagnosis without CONSULT-II" .
OK or NG
OK >> Inspection End.
NG >> 1. Perform transfer control unit/output signal inspection. Refer to TF-55, "
TRANSFER CONTROL
UNIT INSPECTION TABLE" .
2. If NG, recheck transfer control unit pin terminals for damage or loose connection with harness
connector.
LDIA0083E
Terminal ConditionVo l ta g e
(Approx.)
4While actuator is
operating for 4H to
4LOBattery voltage
Actuator does not
operate0V
13While actuator is
operating for 4LO to
4HBattery voltage
Actuator does not
operate0V
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TROUBLE DIAGNOSES FOR SYMPTOMS
TF-85
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Revision: August 20072004 QX56
TROUBLE DIAGNOSES FOR SYMPTOMSPFP:00007
Symptom 1. 4WD Shift Indicator Lamp Does Not Turn ON (Although the ignition
switch is turned ON, all the 4WD indicator lamps do not turn ON for 1 second)
EDS0018E
1. CHECK TRANSFER CONTROL UNIT POWER SOURCE
1. Turn ignition switch to OFF position and disconnect transfer control unit harness connector E142.
2. Turn ignition switch to ON position. (Do not start engine.)
3. Check voltage between transfer control unit harness connector
E142 terminals 16 (Y/R), 22 (Y/R) and ground.
OK or NG
OK >> GO TO 2.
NG >> Check the following.
Continuity between ignition switch and transfer control unit
Ignition switch and No. 49 fuse (10A)
WDIA0071E
WDIA0079E
Voltage : Battery voltage
LDIA0086E
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TF-86
TROUBLE DIAGNOSES FOR SYMPTOMS
Revision: August 20072004 QX56
2. CHECK TRANSFER CONTROL UNIT GROUND CIRCUIT
1. Turn ignition switch to OFF position.
2. Disconnect transfer control unit harness connectors E142 and
E143.
3. Measure resistance between transfer control unit harness con-
nectors E142 and E143 terminals 3(B), 6(B), 45(B) and ground.
OK or NG
OK >> GO TO 3.
NG >> Check continuity between transfer control unit and
ground.
3. CHECK PROCEDURES FROM THE BEGINNING AGAIN
Check again.
OK or NG
OK >> Inspection End.
NG >> 1. Perform transfer control unit input/output signal inspection. Refer to TF-55, "
TRANSFER CON-
TROL UNIT INSPECTION TABLE" .
2. If NG, recheck transfer control unit pin terminals for damage or loose connection with harness
connector. Resistance : Continuity should exist.
LDIA0087E
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TROUBLE DIAGNOSES FOR SYMPTOMS
TF-87
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Revision: August 20072004 QX56
Symptom 2. 4WD Warning Lamp Does Not Turn ON (Although the ignition
switch is turned ON, the 4WD warning lamp does not turn ON)
EDS0018F
1. CHECK TRANSFER CONTROL UNIT POWER SOURCE
1. Turn ignition switch to OFF position and disconnect transfer control unit harness connector E142.
2. Turn ignition switch to ON position (do not start engine).
3. Check voltage between transfer control unit harness connector
E142 terminals 16 (Y/R), 22 (Y/R) and ground.
OK or NG
OK >> GO TO 2.
NG >> Check the following.
Continuity between ignition switch and transfer con-
trol unit
Ignition switch and No. 49 fuse (10A)
2. CHECK TRANSFER CONTROL UNIT GROUND CIRCUIT
1. Turn ignition switch to OFF position.
2. Disconnect transfer control unit harness connectors E142 and
E143.
3. Measure resistance between transfer control unit harness con-
nectors E142 and E143 terminals 3 (B), 6 (B), 45 (B) and
ground.
OK or NG
OK >> GO TO 3.
NG >> Check continuity between transfer control unit and
ground.
3. CHECK 4WD WARNING LAMP CIRCUIT AND COMBINATION METER
Check the following.
Combination meter. Refer to DI-17, "How to Proceed With Trouble Diagnosis" .
Continuity between ignition switch and combination meter
Continuity between combination meter and transfer control unit
OK or NG
OK >> Replace transfer control unit. Refer to TF-98, "Removal and Installation" .
NG >>
Repair or replace harness or connector.
Replace combination meter. Refer to DI-25, "Removal and Installation of Combination Meter" .
WDIA0080E
Voltage : Battery voltage
LDIA0089E
Resistance : Continuity should exist.
LDIA0087E
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TF-88
TROUBLE DIAGNOSES FOR SYMPTOMS
Revision: August 20072004 QX56
Symptom 3. 4WD Shift Indicator Lamp Does Not Turn OFF (When 4WD shift
switch is set from 4H to 4LO, all the 4WD shift indicator lamps do not turn off)
EDS0018G
1. CHECK ATP SWITCH CIRCUIT
Check ATP switch circuit.
Refer to TF-69, "
Diagnostic Procedure" .
OK or NG
OK >> GO TO 2.
NG >> Check, repair or replace faulty parts.
2. CHECK PROCEDURE FROM THE BEGINNING AGAIN
Check again.
OK or NG
OK >> Inspection End.
NG >> Recheck each connector pin terminals for damage or loose connection.
WDIA0071E
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TROUBLE DIAGNOSES FOR SYMPTOMS
TF-89
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Revision: August 20072004 QX56
Symptom 4. ATP Warning Lamp Does Not Turn ON (When 4WD shift switch is
set from 4H to 4LO with the A/T selector lever in P position, the ATP warning
lamp does not turn on)
EDS0018H
1. CHECK ATP SWITCH CIRCUIT
Check ATP switch circuit.
Refer to TF-69, "
ATP SWITCH, WAIT DETECTION SWITCH AND
NEUTRAL-4LO SWITCH" .
OK or NG
OK >> GO TO 2.
NG >> Check, repair or replace faulty parts.
2. CHECK COMBINATION METER
Check the combination meter. Refer to DI-17, "
How to Proceed With Trouble Diagnosis"
OK or NG
OK >> Replace transfer control unit. Refer to TF-98, "Removal and Installation" .
NG >> Replace combination meter. Refer to DI-25, "
Removal and Installation of Combination Meter" .
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TF-90
TROUBLE DIAGNOSES FOR SYMPTOMS
Revision: August 20072004 QX56
Symptom 5. 4LO Indicator Lamp Does Not Turn ON (When 4WD shift switch is
set from 4H to 4LO position, 4LO indicator lamp does not turn ON)
EDS0018I
1. CHECK TRANSFER CONTROL UNIT POWER SUPPLY CIRCUIT
1. Disconnect battery negative terminal, then transfer control unit connectors.
2. Connect battery negative terminal and turn ignition switch ON (with engine stopped).
3. Check voltage across transfer control unit connector E142 and E143 terminals 16 (Y/R), 47 (W) and
ground.
OK or NG
OK >> GO TO 2.
NG >> Check the following.
Continuity between battery, ignition switch and trans-
fer control unit
Ignition switch. Refer to PG-4, "POWER SUPPLY
ROUTING CIRCUIT" .
No. 53 fuse (20A) and No. 49 fuse (10A)
2. CHECK TRANSFER CONTROL UNIT GROUND CIRCUIT
1. Turn ignition switch to OFF position.
2. Disconnect transfer control unit harness connectors E142 and
E143.
3. Measure resistance between transfer control unit harness con-
nectors E142 and E143 terminals 3 (B), 6 (B), 45 (B) and
ground.
OK or NG
OK >> GO TO 3.
NG >> Check continuity between transfer control unit and
ground. Voltage : Battery voltage
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WDIA0081E
Resistance : Continuity should exist.
LDIA0087E
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TROUBLE DIAGNOSES FOR SYMPTOMS
TF-91
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Revision: August 20072004 QX56
3. CHECK 4LO INDICATOR LAMP CIRCUIT AND COMBINATION METER
Check the following.
Combination meter. Refer to DI-17, "How to Proceed With Trouble Diagnosis" .
Continuity between ignition switch and combination meter
Continuity between combination meter and transfer control unit
Condition of ATP and neutral-4LO switch circuit. Refer to TF-69, "ATP SWITCH, WAIT DETECTION
SWITCH AND NEUTRAL-4LO SWITCH" .
OK or NG
OK >> Replace transfer control unit. Refer to TF-98, "Removal and Installation" .
NG >>
Repair or replace harness or connector.
Replace combination meter. Refer to DI-25, "Removal and Installation of Combination Meter" .
Replace ATP or neutral-4LO switch.
Symptom 6. 4WD Shift Indicator Lamp Does Not Indicate “LOCK” (When 4WD
shift switch is set to “4H”, 4WD shift indicator lamp does not indicate “LOCK”)
EDS0018J
1. CHECK 4WD WARNING LAMP
Is 4WD warning lamp turned ON?
Ye s o r N o
Yes >> Refer to TF-27, "Trouble Diagnosis without CONSULT-
II" .
No >> GO TO 2.
2. CHECK NEUTRAL-4LO, WAIT DETECTION AND ATP SWITCH CIRCUITS
Check neutral-4LO, wait detection and ATP switch circuits. Refer to TF-69, "
ATP SWITCH, WAIT DETECTION
SWITCH AND NEUTRAL-4LO SWITCH" .
OK or NG
OK >> GO TO 3.
NG >> Check, repair or replace faulty parts.
3. CHECK PROCEDURES FROM THE BEGINNING AGAIN
Check again.
OK or NG
OK >> Inspection End.
NG >> Recheck each connector pin terminals for damage or loose connection.
WDIA0071E