Malfunction Indicator Light
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NOTE:
The PCM diagnostic memory is retained by a direct power supply from the battery. Memory is not erased by turning off the ignition, but is erased if the battery or PCM are disconnected.
Also called CHECK ENGINE light, the Malfunction Indicator Light (MIL) illuminates when the ignition is turned on. The light remains on for several seconds after the engine has started. If an abnormal input signal occurs, the MIL stays illuminated and Diagnostic Trouble Code (DTC) is stored in memory. If the abnormal input signal returns to normal, PCM turns light off but DTC remains stored in memory until cleared. If the ignition is turned on again, the MIL will not stay illuminated, until the PCM detects another malfunction during system operation.