Key Detection Circuit Malfunctions

Key detection circuit malfunctions include the following conditions:
- An open
- A short to voltage
- A short to ground

The theft deterrent module turns ON the SECURITY indicator when a key detection circuit malfunction occurs.

If the malfunction is present when you attempt to start the engine, the theft deterrent module performs the following actions:
- Sends a password to the PCM through the fuel enable signal circuit
This password disables fuel delivery to the engine.
- Disables the theft deterrent relay

The vehicle will exhibit a no-crank engine condition.

If the malfunction is present after the engine is started, the theft deterrent module enters a fail-enable mode. The theft deterrent module performs the following actions when you attempt to start the engine again:
- Sends a password to the PCM through the fuel enable circuit
This password enables fuel delivery to the engine.
- Enables the theft deterrent relay The engine will start.