Malfunction Indicator Light (MIL)

When ignition is first turned on, MIL should come on and remain on for 3 seconds to verify bulb and circuit operation, and then go off. The MIL is located on instrument panel, just below fuel gauge.

The Powertrain Control Module (PCM) monitors several different engine control system circuits. If malfunction occurs which affects vehicle emissions, a Diagnostic Trouble Code (DTC) will be stored in PCM and PCM enters limp-in mode. When DTC is stored in PCM, the PCM will turn on the MIL and MIL will remain on steady.

If PCM detects active engine misfire severe enough to cause catalytic converter damage, MIL will flash to warn the driver of possible damage. If active engine misfire quits, MIL will be on steady for more than one trip, but will go out if conditions required to set DTC are not found on following trips.

NOTE: A trip is defined as the engine is started, an increase of 40°F (4°C) in engine coolant temperature exists after engine is started, and engine coolant temperature reaches at least 160°F (71°C).

If PCM detects engine misfire for 2 trips, MIL will come on and remain on steady, and DTC will be stored in PCM.

The PCM will turn off MIL when malfunction is not detected during 3 consecutive trips on all applications except an engine misfire or fuel system monitor.

NOTE: For additional information on engine misfire and fuel system monitor, see ON-BOARD DIAGNOSTICS.

The PCM will turn off MIL when malfunction is not detected during 3 engine misfire or fuel system monitor tests. The PCM performs engine misfire or fuel system monitor tests when engine is operating within 375 RPM and with 10 percent of the load of operating condition at which first malfunction was detected.