Purpose for Clearing Codes

PURPOSE
The Powertrain Control Module (PCM) reset allows the scan tool to clear all emission related diagnostic information. When resetting the PCM, a Diagnostic Trouble Code (DTC) P1000 will be stored in the PCM until all the On-Board Diagnostics II (OBD II) system monitors or components have been tested to satisfy a Trip without any other faults occurring.

The following events occur when a PCM reset is performed:

- Clears the number of DTC's

- Clears the DTC'S

- Clears the Freeze Frame Data

- Clears Heated Oxygen Sensor (HO2S) test data

- Resets status of the OBD II system monitors

- Sets DTC P1000

RESETTING KEEP ALIVE MEMORY
Resetting Keep Alive Memory (KAM) clears learned values stored for adaptive systems such as idle and fuel systems. The PCM will relearn new adaptive values when the vehicle is driven.