Engine Control Module

WARNING: This page is about a different car, the 1999 Cadillac Catera. However, it is still accessible from the selected car via links, so may be relevant.

The condition for the DTC is no longer present. The ECM turns off the MIL after 3 consecutive drive trips that the diagnostic runs and passes
The scan tool clear DTC function is used.
A history DTC clears after 40 consecutive warm-up cycles, if no failures are present by this diagnostic or any other emission related diagnostic
The ECM battery voltage is interrupted