Misfire Diagnostic Shut Off

Misfire diagnostics are also shut off when:

1. Leak diagnostic, when leak diagnostics are taking place
2. DTCs in the flywheel sensor, MAF sensor, Engine Coolant Temperature sensor and leak diagnostic

Misfiring lights the malfunction indicator lamp (MIL). In the event of misfiring, if there is risk of damage to the three way catalytic converter, the malfunction indicator lamp (MIL) will flash and then switch to a constant light. The ECM registers and stores the RPM and load ranges within which the misfire occurred. For the DTC to be stored, the misfire must occur a further two times within the same RPM and load ranges. The Malfunction Indicator Lamp (MIL) lights if the DTC for misfire is stored in the previous operating cycle and a new DTC for misfire is received in the next operating cycle. If the misfire stops, the requirements for the RPM and load ranges must be met without any misfires before the ECM will begin counting down to extinguish the warning lamp and erase stored DTCs for misfiring.