Manual Transmission Shift Light

Circuit Description
The Control Module controls the shift lamp using the following inputs:
^ The Engine Coolant Temperature (ECT) sensor
^ The Throttle Position (TP) sensor
^ The Vehicle Speed sensor (VSS)
^ The Engine RPM

The Control Module uses the measured RPM and the vehicle speed in order to calculate what gear the vehicle is in. This calculation determines when the shift lamp should be turned ON.

Diagnostic Aids
Intermittent conditions can be cause by wiring problems.
An intermittent may be caused by any of the following conditions:
^ A poor connection
^ Rubbed through wire insulation
^ A broken wire inside the insulation

Thoroughly check any circuitry that is suspected of causing the intermittent complaint. Refer to Intermittents and Poor Connections Diagnosis. Symptom Related Diagnostic Procedures

Test Description
The numbers below refer to the step numbers on the diagnostic table.
1. This step checks the Control Module's ability to control the shift lamp.