•  The MIL is illuminated when a malfunction is detected in two consecutive drive cycles. The code for a failed system is stored in the PCM memory in the first drive cycle. This code is called the pending code. If the malfunction is not found in the second drive cycle, the PCM determines that the system returned to normal or the malfunction was mistakenly detected, and deletes the pending code. If the malfunction is found in the second drive cycle too, the PCM determines that the system has failed, deletes the pending code, illuminates the MIL and stores the DTC.