Circuit Description

PCM monitors unexpected PCM reset. This does not illuminate MIL, but does store DTC P1625. This indicates clock, or Computer Operating Properly (COP) has reset.

When DTC sets, PCM will not illuminate MIL. PCM will store conditions resent when DTC set as failure records data only. A history DTC is set.

PCM 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 PCM.