Test S: Service Engine Soon Indicator Inoperative/Always On

Turn ignition switch to LOCK position. Connect New Generation Star (NGS) tester to Data Link Connector (DLC). DLC is located below driver's side of instrument panel, right of steering column. Turn ignition switch to RUN position. Using NGS tester, select instrument cluster active command MIL. Trigger active command MIL 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, go to next step.
Disconnect all instrument cluster harness connectors. It may be necessary to remove instrument cluster for access to instrument cluster harness connectors. See REMOVAL & INSTALLATION . Inspect all instrument cluster harness connectors for loose, damaged or corroded terminals. If terminals are damaged, repair as necessary. If terminals are not damaged, reconnect all instrument cluster harness connectors. Ensure instrument cluster harness connectors are seated properly. If problem still exists, replace instrument cluster module.