4WD Warning Lamp Does Not Turn On
4WD Warning Lamp Does Not Turn ONSYMPTOM: 4WD warning lamp does not turn ON when turning ignition switch to "ON".
DIAGNOSTIC PROCEDURE
1. CHECK TRANSFER CONTROL UNIT POWER SUPPLY CIRCUIT
1. Turn ignition switch "OFF". (Stay for at least 5 seconds.)
2. Connect transfer control unit harness connector.
3. Check voltage between transfer control unit harness connector terminals and ground.
4. Turn ignition switch "ON". (Do not start engine.)
5. Check voltage between transfer control unit harness connector terminals and ground.
OK or NG
OK >> GO TO 4.
NG >> Check the following. If any items are damaged, repair or replace damaged parts.
^ 10A fuses No. 26 located in fuse and fusible link box and No. 59 located in the fuse and relay box.
^ 20A fuse No. 53 located in the IPDM E/R.
^ Harness for short or open between battery and transfer control unit harness connector terminals 47.
^ Harness for short or open between battery and transfer control unit harness connector terminal 29.
^ Harness for short or open between battery and transfer shut off relay harness connector E69 terminal 1 (G), and 3 (G).
^ Harness for short or open between transfer shut off relay harness connector E69 terminal 2 (SB) and transfer control unit harness connector terminal 30.
^ Harness for short or open between transfer shut off relay harness connector E69 terminal 5 (Y/ R) and transfer control unit harness connector terminals 16 (Y/R) and 22 (Y/R).
^ Battery and ignition switch.
^ Transfer shut off relay.
2. CHECK TRANSFER CONTROL UNIT GROUND CIRCUIT
1. Turn ignition switch "OFF". (Stay for at least 5 seconds.)
2. Disconnect transfer control unit harness connector.
3. Check continuity between transfer control unit harness connector E142 terminals 3 (B), 6 (B), E143 terminal 45 (B) and ground. Continuity should exist. Also check harness for short to ground and short to power.
OK or NG
OK >> GO TO 3.
NG >> Repair open circuit or short to ground or short to power
in harness or connectors.
3. CHECK COMBINATION METER 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 combination meter harness connector terminal and ground.
4. Turn ignition switch "ON". (Do not start engine.)
5. Check voltage between combination meter 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.
^ 10A fuse No. 14 located in the fuse block (J/B).
^ Harness for short or open between battery and combination meter harness connector M24 terminal 24 (O/L).
^ Ignition switch.
4. CHECK HARNESS BETWEEN TRANSFER CONTROL UNIT AND COMBINATION METER
1. Turn ignition switch "OFF". (Stay for at least 5 seconds.)
2. Disconnect transfer control unit harness connector and combination meter harness connector.
3. Check continuity between the following terminals. - Transfer control unit harness connector E142 terminal 5 (W/B) and combination meter harness connector M24 terminal 34 (W/ B).
Continuity should exist.
Also check harness for short to ground and short to power.
OK or NG
OK >> GO TO 5.
NG >> Repair or replace damaged parts.
5. CHECK INDICATOR LAMP CIRCUIT
1. Connect combination meter harness connector.
2. Disconnect transfer control unit harness connector.
3. Turn ignition switch "ON". (Do not start engine.)
4. Ground the following terminal using suitable wiring.
- Transfer control unit harness connector E142 terminal 5 (W/B) and ground.
Does 4WD warning lamp turn on?
OK >> GO TO 6.
NG >> Replace combination meter.
6. SYMPTOM CHECK
Check again.
OK or NG
OK >> Inspection End.
NG >> GO TO 7.
7. CHECK TRANSFER CONTROL UNIT
Check transfer control unit input/output signal.
OK or NG
OK >> Inspection End.
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.