Grand Cherokee 2WD L6-4.0L VIN S (1997)
Malfunction Indicator Lamp: Testing and Inspection
Malfunction Indicator Lamp
The diagnosis found here addresses an inoperative malfunction indicator (Check Engine) lamp condition.
WARNING: ON VEHICLES EQUIPPED WITH AIR-BAGS, REFER TO AIR BAGS AND SEAT BELTS/AIR BAGS BEFORE
ATTEMPTING STEERING WHEEL, STEERING COLUMN, OR INSTRUMENT PANEL COMPONENT DIAGNOSIS OR SERVICE.
FAILURE TO TAKE THE PROPER PRECAUTIONS COULD RESULT IN ACCIDENTAL AIR-BAG DEPLOYMENT AND POSSIBLE
PERSONAL INJURY.
If the malfunction indicator lamp fails to light during the bulb test (about three seconds after the ignition switch is turned to the On position), replace the
malfunction indicator lamp bulb with a known good unit. If the indicator lamp still fails to operate, diagnosis of the lamp, the instrument cluster circuitry,
or the CCD data bus should be performed with a DRB scan tool. Diagnosis of the Powertrain Control Module (PCM) should be performed with a DRB
scan tool.
