System Operation

SYSTEM OPERATION
The PASS-Key II system prevents the engine from starting if the proper resistance is not sensed from the ignition key. Only one of the 15 resistance values available works with each PASS-Key II module.

The PASS-Key II module controls the starter enable relay and the PCM fuel enable input. If the PASS-Key II module does not send the proper pulse width modulated (PWM) signal to the PCM fuel enable input, the PCM does not allow fuel to be provided to the engine.

If the wrong resistance value is sensed when the ignition is turned on, the PASS-Key II module does not ground the starter enable circuit and does 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 is sensed when the ignition is turned on, the PASS-Key II module grounds the starter enable circuit and outputs the fuel enable PWM signal. This allows the engine to start normally.