Test P: Service Engine Soon Indicator Never/Always On

Connect New Generation Star (NGS) tester to Data Link Connector (DLC). Turn ignition switch to RUN position. Using NGS tester, select instrument cluster active command MIL. Trigger MIL active command on. If SERVICE ENGINE SOON indicator illuminates, repair powertrain control concern. See appropriate SELF-DIAGNOSTICS article in ENGINE PERFORMANCE. If SERVICE ENGINE SOON indicator does not illuminate, replace bulb or instrument cluster as necessary.