Circuit Description

ECM monitors unexpected ECM reset. When DTC sets, ECM will not turn MIL on. DTC will only record DTC.

When DTC sets, ECM will not illuminate MIL. ECM will store conditions present when DTC was set as FAILURE RECORDS data only.

ECM will turn MIL off on third consecutive trip cycle during which diagnostic runs and fault is no longer recognized. A history DTC will clear after 40 consecutive trip cycles during which diagnostic runs and fault is no longer recognized. DTC can be cleared with scan tool, or by disconnecting battery voltage feed to ECM.