O/D Off Indicator Lamp Does Not Come On

1. O/D OFF Indicator Lamp Does Not Come On

SYMPTOM: O/D OFF indicator lamp does not come on for about 2 seconds when turning ignition switch to ON.

1. CHECK TCM POWER SOURCE
1. Turn ignition switch to ON position.
(Do not start engine.)







2. Check voltage between TCM terminals (10, 19, 28) and ground.

Voltage : Battery voltage

3. Turn ignition switch to OFF position.
4. Check voltage between TCM terminal 28 and ground.

Voltage: Battery voltage

OK or NG?

OK >> GO TO 2.

NG >> Check the following items:
- Harness for short or open between ignition switch and TCM (Main harness)
- Refer to "Wiring Diagram - AT - MAIN" Automatic Transmission Wiring Diagrams.
- Ignition switch and fuse


2. CHECK TCM GROUND CIRCUIT
1. Turn ignition switch to OFF position.
2. Disconnect TCM harness connector.
3. Check resistance between TCM terminals (25, 48) and ground. Refer to "Wiring Diagram - AT MAIN" Automatic Transmission Wiring Diagrams.

If OK, check harness for short to ground and short to power.
Is resistance approximately 0 Ohms?

Yes >> GO TO 3.

No >>
- Repair open circuit or short to ground or short to power in harness or connectors.
- Refer to "Wiring Diagram - AT - MAIN" Automatic Transmission Wiring Diagrams.


3. CHECK LAMP CIRCUIT
1. Turn ignition switch to ON position.
2. Set overdrive control switch to ON position.







3. Check voltage between TCM connector M77 terminal 13 and ground.
Does battery voltage exist?

Yes >> GO TO 4.

No >> Check the following items.
- Fuse
- O/D OFF indicator lamp
- Harness for short or open between ignition switch and O/D OFF indicator lamp (Main harness)
- Harness for short or open between O/D OFF indicator lamp and TCM


4. CHECK SYMPTOM
Check again.

OK or NG?

OK >> INSPECTION END.

NG >>
1. Perform TCM input/output signal inspection.
2. If NG, recheck TCM pin terminals for damage or loose connection with harness connector.