Theft Deterrent Circuits

The ECM and the theft deterrent module exchange data using two existing circuits. The MIL Control circuit connects to the ECM and the theft deterrent module. When the ignition switch is turned on, and the ECM illuminates the MIL (bulb check), the voltage change on the MIL Control circuit is used as a wake up signal to the theft deterrent module. If a problem with this circuit prevents the theft deterrent module from receiving the wake up signal, a DTC will set. The vehicle speed signal circuit is also connected to both the ECM and the theft deterrent module. The theft deterrent system frequency code relays between the two controllers via this circuit. The DTCs that apply to problems involving the exchange of data between the ECM and the theft deterrent module are as follows:
^ DTC P1501 Theft Deterrent System
^ DTC P1502 Theft Deterrent Fuel Enable Signal Not Received
^ DTC P1503 Theft Deterrent Fuel Enable Signal Not Correct