Clearing Diagnostic Trouble Codes

Description
The Powertrain Control Module (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. For more information about a drive cycle, refer to Drive Cycles. Clearing codes from the vehicle-specific RETRIEVE/CLEAR CONTINUOUS DTCs will clear all systems, including the OBD II Systems. Clearing codes from the OBD II generic menu will only clear OBD II features for the 7.3L diesel.

The following events occur when a PCM reset is performed:
^ Clears the number of Diagnostic Trouble Codes (DTC).
^ Clears the DTCs.
^ Clears the freeze frame data.
^ Resets status of the OBD II system monitors.
^ Sets DTC P1000 as a vehicle-specific DTC. P1000 will not appear as an OBD II code.

Resetting OBD II Codes

New Generation Star
^ Turn key off.
^ Perform the necessary vehicle preparation and visual inspection.
^ SELECT CORRECT VEHICLE YEAR and MODEL.
^ Follow operating instructions from the menu.
^ Select GENERIC OBD II FUNCTIONS.
- Press CONT button if all OBD II monitors are not complete.
^ Turn key on.
^ Select CLEAR DIAGNOSTIC CODES.
^ Press START Key.

Generic Scan Tool
Refer to the manufacturer's manual for specific instructions.

Resetting KAM
Disconnect the negative lead from the battery for a minimum of 5 minutes.

After KAM has been reset, DTCs P1000 and P0603 will be stored in the PCM.