Antitheft Signal: Description and Operation

When the ignition is turned "ON", the PASS-key (registered trademark) decoder "reads" the key resistor pellet. If the proper resistance is recognized by the PASS-key (registered trademark) decoder module, it sends a PWM fuel enable signal to the PCM. The PCM looks for this signal during crank and allows fuel delivery by enabling the injectors when the signal is recognized. If the fuel enable signal is lost while the engine is running, the PCM will store code 58 and the vehicle will run normally. As long as code 58 is stored, the PCM will ignore any absence of the fuel enable signal and the car will start and run as long as the problem is isolated to the fuel enable circuit only.