Malfunction Indicator Light

Malfunction Indicator Light (MIL), comes on and remains on for 3 seconds as a bulb test each time ignition switch is turned to ON position. If PCM receives an incorrect signal or receives no signal from battery voltage input, charging system, ECT sensor, MAP sensor or TP sensor, MIL will come on. MIL will also come on if certain emission-related faults exist. This warns driver that PCM is in limp-in mode and immediate repairs are necessary. See LIMP-IN MODE  under MISCELLANEOUS CONTROLS. MIL can also be used to display Diagnostic Trouble Codes (DTCs) on some vehicles. For additional information, see appropriate SELF-DIAGNOSTICS article.