4WD Shift Indicator Lamp and 4LO Indicator Lamp Do Not Turn On
4WD Shift Indicator Lamp and 4LO Indicator Lamp Do Not Turn ONSYMPTOM: 4WD shift indicator lamp and 4LO indicator lamp do not turn ON for approximately 1 second 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 2.
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). Refer to PG-4, "POWER SUPPLY ROUTING CIRCUIT". Power Supply Routing Circuit Schematic
^ 20A fuse (No. 53 located in the IPDM E/R). Refer to PG-4, "POWER SUPPLY ROUTING CIRCUIT". Power Supply Routing Circuit Schematic
^ 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, and 3.
^ Harness for short or open between transfer shut off relay harness connector E69 terminal 2 and transfer control unit harness connector terminal 30.
^ Harness for short or open between transfer shut off relay harness connector E69 terminal 5 and transfer control unit harness connector terminals 16 and 22.
^ Battery and ignition switch. Refer to PG-4, "POWER SUPPLY ROUTING CIRCUIT". Power Supply Routing Circuit Schematic
^ Transfer shut off relay. Refer to TF-57, "COMPONENT INSPECTION". Power Supply Circuit For Transfer Control Unit
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, 6, E143 terminal 45 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)].
Refer to PG-4, "POWER SUPPLY ROUTING CIRCUIT". Power Supply Routing Circuit Schematic
^ Harness for short or open between battery and combination meter harness connector M24 terminal 24.
^ Ignition switch. Refer to PG-4, "POWER SUPPLY ROUTING CIRCUIT". Power Supply Routing Circuit Schematic
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 2 and combination meter harness connector M24 terminal 32.
- Transfer control unit harness connector E142 terminal 11 and combination meter harness connector M24 terminal 31.
- Transfer control unit harness connector E142 terminal 12 and combination meter harness connector M24 terminal 33.
- Transfer control unit harness connector E142 terminal 21 and combination meter harness connector M24 terminal 30.
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".
4. Ground the following terminals using suitable wiring.
- Transfer control unit harness connector E142 terminal 2 and ground.
- Transfer control unit harness connector E142 terminal 11 and ground.
- Transfer control unit harness connector E142 terminal 12 and ground.
- Transfer control unit harness connector E142 terminal 21 and ground.
Do indicator lamps 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. Refer to TF-35, "Transfer Control Unit Input/Output Signal Reference Values". Pinout Values and Diagnostic Parameters
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.