Firebird V8-305 5.0L VIN E TBI (1989)
Shift Light: Testing and Inspection
Chart C-8B
Chart C-8B Wiring Diagram
CIRCUIT DESCRIPTION:
The shift lamp display is in the instrument panel. The purpose of the shift light is to provide a display, to the driver, which indicates the best transmission
shift point for maximum fuel economy based on engine speed and load. The light is controlled by the ECM and is turned "ON" by grounding circuit
456.
The ECM uses information from the following inputs to control the shift light:
^
Coolant temperature
^
TPS
^
VSS
^
RPM