Circuit/System Verification

IMPORTANT: Because of normal system communications between the TDM and ECM, any theft deterrent B-codes must be diagnosed prior to the diagnosis of P-codes.

Program the theft deterrent module. Refer to Theft Deterrent Control Module Programming and Setup . The vehicle should start, the ECM should exit learn mode, and DTC P0633 should clear.

If the ECM does not exit learn mode after the programming attempt, replace the ECM.