Antitheft Signal: Description and Operation

The Vehicle Theft Deterrent module produces the Theft Deterrent Fuel Enable signal when ignition is "ON" and the proper key resistor pellet is sensed by the Vehicle Theft Deterrent module. The PCM monitors the Fuel Enable signal during crank. If the proper signal is present on the Theft Deterrent Fuel Enable circuit, the PCM enables fuel delivery to allow the engine to start. If the PCM detects that the fuel enable signal is not present or incorrect while the engine is running, DTC P1626 will be set. The engine will continue to start and run as long as DTC P1626 is stored and the fault condition affects only the Theft Deterrent Fuel enable circuit. If the PCM detects that the fuel enable signal is not present or incorrect while an attempt is made to start the engine, DTC P1629 will be set. The engine will not start as long as this condition is present. If the problem also affects inputs to the Vehicle Theft Deterrent module, the starter motor may be disabled.