Shift Light: Testing and Inspection

Shift-Up Indicator Circuit:

Checking Shift-Up Indicator Circuit:

CAUTION: This check requires test drive. Use special care for safety when driving.

SYSTEM INSPECTION
1. Turn ignition switch ON, and shift-up indicator light should light.

If not, cause may be burned bulb, open wire, poor connection or faulty ECM. Proceed to "SHIFT UP INDICATOR LIGHT AND ITS CIRCUIT INSPECTION".

2. Start engine, and shift-up indicator light should go off.

If not, cause may be shorted wire to ground or faulty ECM.

3. Warm up engine to normal operating temperature.

4. With gear shift lever in low gear position, increase engine speed. When it exceeds 1,600 rpm shift-up indicator light should light for 5 seconds at the longest.

If it doesn't light, check speed sensor, WTS and pressure sensor. If they are all in good condition, substitute a known good ECM for existing one.


SHIFT UP INDICATOR LIGHT AND ITS CIRCUIT INSPECTION
1. With ignition switch OFF, disconnect ECM coupler from ECM.

2. Turn ignition switch ON, and shift-up indicator light should not light.

If it lights, wire is shorted to ground.

3. Ground A8 terminal of disconnected ECM coupler by using service wire.

The shift up indicator light should light. If not, cause may be burned bulb, open wire or poor connection. Repair or replace as necessary.

4. Connect coupler to ECM securely.