Retrieving Diagnostic Trouble Codes Using Mil (Except Maxima, Quest & SENTRA): Notes

NOTE: CHECK ENGINE or SERVICE ENGINE SOON light is referred to as Malfunction Indicator Light (MIL).

Turn ignition on. Verify MIL is properly illuminated. If MIL does not illuminate, repair MIL circuit. See appropriate wiring diagram in WIRING DIAGRAMS article. Turn mode selector switch on ECM fully clockwise. MIL should turn off. Wait 2 seconds, and turn mode selector fully counterclockwise. System is now in Diagnostic Test Mode II. Retrieve Diagnostic Trouble Codes (DTCs) by observing MIL, and counting the number of flashes. See MIL CODE DISPLAY . Record all codes set and then go to appropriate test procedure. MIL DTC numbering is different than scan tool numbering. See appropriate DIAGNOSTIC TROUBLE CODE (DTC) IDENTIFICATION table.