Shift Indicator - A/T: Description and Operation

Chart C-8C Wiring Diagram:

NOTE: Because different models and engine applications vary in wire colors, circuit numbers, and pin numbers, the above image is a typical example. Refer to COMPUTERS AND CONTROL SYSTEMS/SCHEMATIC AND ROUTING DIAGRAMS for specific schematic applications.

PURPOSE
The Manual Transmission Shift Light provides a display which indicates to the driver the optimum fuel economy point for upshifting the manual transmission based on engine speed and load.

OPERATION
Activation of the ECM driver turns the lamp "ON." The Shift Light will stay "ON" for up to 5 seconds, so as to urge the driver to shift-up. The ECM uses information from the following inputs to control the shift light:

- Engine Coolant Temperature (ECT) sensor.
- Throttle Position (TP) sensor.
- Vehicle Speed Sensor (VSS).
- Engine RPM.

The Shift Light will dim slightly when the headlights and/or parking lights are turned "ON." This is to give better visibility.

LOCATION
The display lamp is on instrument panel.