AWD Warning Lamp Does Not Turn OFF Several Seconds After Engine Started

TROUBLE DIAGNOSIS FOR SYMPTOMS


AWD Warning Lamp Does Not Turn OFF Several Seconds after Engine Started


DIAGNOSTIC PROCEDURE
1.CHECK SELF-DIAGNOSTIC RESULTS
Perform self-diagnosis. Refer to Scan Tool Testing and Procedures.
Is any malfunction detected by self-diagnosis?
YES - Check the malfunctioning system.
NO - GO TO 2.
2.CHECK AWD CONTROL UNIT POWER SUPPLY CIRCUIT
1. Turn ignition switch "OFF".
2. Disconnect AWD control unit harness connector.
3. Turn ignition switch "ON". (Do not start engine.)
4. Check voltage between AWD control unit harness connector terminals and ground.





5. Turn ignition switch "OFF".
6. Check voltage between AWD control unit harness connector terminals and ground.





OK or NG
OK - GO TO 3.
NG - Check the following. If any items are damaged, repair or replace damaged parts.
- 10A fuse [No.33, located in the fuse block (J/B)]
- 10A fuse [No.82, located in the IPDM E/R]
- Harness for short or open between battery and AWD control unit harness connector terminal 9
- Harness for short or open between ignition switch and AWD control unit harness connector terminal 7
- Ignition switch. Refer to Check Ignition Switch Position.
3.CHECK AWD CONTROL UNIT GROUND CIRCUIT
1. Turn ignition switch "OFF".
2. Disconnect AWD control unit harness connector.
3. Check continuity between AWD control unit harness connector F109 terminals 10, 11 and ground.

Continuity should exist.

Also check harness for short to ground and short to power.
OK or NG
OK - GO TO 4.
NG - Repair open circuit or short to ground or short to power in harness or connectors.
4.CHECK AWD CONTROL UNIT
Check AWD control unit input/output signal. Refer to Pinout Values and Diagnostic Parameters.
OK or NG
OK - GO TO 5.
NG - Check AWD control unit pin terminals for damage or loose connection with harness connector. If any items are damaged, repair or replace damaged parts.
5.CHECK OUTPUT SIGNAL WITH UNIFIED METER AND A/C AMP.

With CONSULT-III
1. Turn ignition switch "ON". (Do not start engine.)
2. Select "DATA MONITOR" mode for "METER A/C AMP" with CONSULT-III.
3. Start the engine, and then make sure that "4WD W/L" display turns from "ON" to "OFF" after several seconds.





OK or NG
OK - GO TO 6.
NG - Perform trouble diagnosis for combination meter. Refer to Trouble Diagnosis.
6.SYMPTOM CHECK
Check again.
OK or NG
OK INSPECTION END
NG - Replace unified meter control unit assembly. Refer to Disassembly and Assembly of Combination Meter.