Powertrain Control Module Reset: Description

WARNING: This page is about a different car, the 2003 Ford Windstar. However, it is still accessible from the selected car via links, so may be relevant.

All OBD-II scan tools support Powertrain Control Module (PCM) reset. The PCM Reset allows the scan tool to command the PCM to clear all emission-related diagnostic information. When resetting the PCM, a DTC P1000 will be stored in the PCM until all the OBD-II system monitors or components have been tested to satisfy a drive cycle, without any other faults occurring. See DRIVE CYCLES in SELF-DIAGNOSTICS - CNG, FLEX-FUEL & GASOLINE article.

The following events occur when a PCM reset is performed:

Clears the number of Diagnostic Trouble Codes (DTCs).
Clears the DTCs.
Clears the freeze frame data.
Clears diagnostic monitoring test results.
Resets status of the OBD-II system monitors.
Sets DTC P1000.