System Operation

SYSTEM OPERATION
The PASS-Key II(R) system is designed to prevent the engine from starting if the proper resistance is not sensed from the ignition key. Of the 15 key codes (resistance values) available, only one will work with each theft deterrent module.

The PASS-Key II(R) system prevents the engine from starting by controlling the theft deterrent relay and the PCM fuel enable input. if the PCM does not sense the proper pulse width modulate (PWM) signal on the fuel enable input, it will not provide fuel to the engine.

If the wrong resistance value is sensed when the ignition switch is in the "RUN" position, the theft deterrent module will not ground the theft deterrent relay and will not output the fuel enable PWM signal for approximately three minutes. This prevents the engine from starting and discourages the thief from trying key codes (resistance values) at random.

If the correct resistance value is sensed when the ignition switch is in the "RUN" position, the theft deterrent module will ground the theft deterrent relay assembly and output the fuel enable PWM signal. This will allow the engine to start normally.