Cherokee 4WD V6-173 2.8L VIN W 2-bbl (1985)
Check Engine Lamp: Description and Operation
The instrument panel mounted "Check Engine" lamp is used to alert the operator of malfunctions within the C3 system. When the ignition is on with
the engine stopped, the lamp is illuminated as a bulb check. When the engine is running, the lamp will be illuminated whenever the ECM senses a system
malfunction. In addition, the lamp is used to access trouble codes stored in the ECM trouble code memory.