Cutlass L4-138 2.3L VIN A FI HP (1990)
Shift Indicator: Description and Operation
Manual Transmission Shift Light
The purpose of the shift light is to provide a display to indicate the optimum fuel economy point for upshifting the manual transmission based on engine
speed and load. The display is a lamp on the instrument panel. Activation of the ECM lamp driver will turn the Shift Light "ON."
