Test N: Check Fuel Cap Indicator Inoperative/Always On

NOTE: If vehicle has been driven with fuel cap unsecured and CHECK FUEL CAP indicator is illuminated, vehicle will need to be driven several minutes with fuel cap secured before CHECK FUEL CAP indicator will go out.

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, perform Powertrain Control Module (PCM) self-test. If PCM DTC P0457 does not exist, go to next step. If PCM DTC P0457 exists, repair powertrain control concern. See appropriate SELF-DIAGNOSTICS article in ENGINE PERFORMANCE.
Using NGS tester, select Instrument Cluster Module (ICM) active command INDICATOR LAMP CONTROL III. Trigger active command CHECK FUEL CAP on. If CHECK FUEL CAP indicator does not illuminate, go to next step. If CHECK FUEL CAP indicator illuminates, repair powertrain control concern. See appropriate SELF-DIAGNOSTICS article in ENGINE PERFORMANCE.
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.