Intermittent Malfunction Indicator Lamp (MIL)

In the case of an intermittent fault, the Malfunction Indicator Lamp (MIL) may illuminate and then after 3 trips turn OFF. However, the corresponding diagnostic trouble code will store in the memory. When unexpected diagnostic trouble codes appear, check for an intermittent malfunction.

The following can cause an intermittent MIL and no DTCs:
^ Electrical system interference caused by a malfunctioning relay, PCM driven solenoid or switch. They can cause a sharp electrical surge. Normally, the problem will occur when the malfunctioning component is operating.
^ The improper installation of electrical devices; such as lights, 2-way radios, electric motors, etc.
^ The Malfunction Indicator Lamp (MIL) circuit intermittently shorted to ground.
^ Poor PCM grounds.