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Malfunction Indicator Light (Mil): Notes

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

Turn ignition on. Verify MIL is properly illuminated. If MIL does not illuminate, repair MIL circuit. Turn mode selector switch on PCM 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. Record all codes set and then go to appropriate test procedure. MIL DTC numbering is different than CONSULT or GST DTC numbering. See appropriate DTC IDENTIFICATION table under DIAGNOSTIC TROUBLE CODE DEFINITIONS .

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