OBD-II Drive Cycle & Diagnostic Trouble Codes

A Diagnostic Trouble Code (DTC) will be stored in PCM memory after a malfunction is first detected. A DTC will be erased from the PCM's memory after 40 engine warm-up cycles without the malfunction being detected after the MIL is turned off. Once a monitor turns on the MIL, it will require 3 consecutive drive cycles without a fault for the MIL to turn off. Another method of erasing the DTC is by initiating a PCM reset. DTC memory storage requirements vary with each monitor. See appropriate monitor under ON BOARD DIAGNOSTIC-II MONITOR .