Computers and Control Systems: Service and Repair

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. Clearing codes from the vehicle-specific RETRIEVE/CLEAR CONTINUOUS DTCs will clear all systems, except the IDM (see KOEO On-Demand Self Test), including 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.

New Generation Star
- Turn key OFF.
- Perform the necessary vehicle preparation and visual inspection.
- Select VEHICLE & ENGINE SELECTION menu (optional).
- Select NEW VEHICLE YEAR & MODEL.
- Select year, engine, model with the appropriate qualifier, if needed (for example, transmission, 49 States, California).
- 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 scan tool manufacturer's manual for specific instructions.

Resetting Keep Alive Memory (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.