Cherokee 4WD L6-242 4.0L VIN M FI (1988)
Shift Light: Description and Operation
Up-Shift Indicator Light
This light is controlled by the ECU and is lit to indicate that the driver should shift to the next highest gear for best fuel economy. The lamp is located on
the left side of the instrument panel just below the safety belt and "BRAKE" lamps. The ECU will turn this light off if the up-shift hasn't occurred within
3 to 5 seconds of its initial illumination. The light will come back on if acceleration has stopped and the engine rpm has dropped below the range of shift
light operation.
This light is illuminated upon engine start-up and should go off after the engine has started. Engine speed and load are what determines when the ECU
turns the light on.
NOTE: Once the vehicle has been shifted to its highest gear the light will not illuminate, due to the operation of a switch located on the
transmission.
