Scope of Engine Control Module Service
ECM ServiceService of the Engine Control Module (ECM) should normally consist of either replacing the ECM or programming the Theft Deterrent System frequency code. If the diagnostic procedures call to replace the ECM, first check the ECM in order to see if the ECM is the correct part. If the ECM is correct, remove the malfunctioning ECM and install the new service ECM. Reprogram the new ECM with the frequency code of the Theft Deterrent Module currently on the vehicle after the ECM has been replaced. Refer to Theft Deterrent System under Accessories and Optional Equipment for the proper procedure. The vehicle will not start until this procedure is performed.