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Symptom: *CHECKING THE CHECK ENGINE LAMP OPERATION POSSIBLE CAUSES ACTUATE CHECK ENGINE LAMP CHECK ENGINE CONTROL CIRCUIT SHORTED TO VOLTAGE CHECK ENGINE LAMP BULB ENGINE CONTROL MODULE INSTRUMENT CLUSTER INSTRUMENT CLUSTER - LAMP NEVER ON POWERTRAIN CONTROL MODULE - CONTROL SHORTED TO VOLTAGE POWERTRAIN CONTROL MODULE - INTERNAL FAULT CHECK ENGINE LAMP CONTROL CIRCUIT SHORTED TO GROUND CHECK ENGNINE LAMP CONTROL CIRCUIT OPEN POWERTRAIN CONTROL MODULE - CONTROL SHORTED TO GROUND TEST ACTION APPLICABILITY 1 Turn the ignition on and observe the Check Engine Lamp. All Yes → No → 2 Turn the ignition on. All Yes → The Check Engine Lamp System is working properly. No → 3 Turn the ignition off. All Yes → Above Below 163 DRIVEABILITY - DIESEL |