Symptom Chart

WARNING: This page is about a different car, the 2005 Ford Pickup. However, it is still accessible from the selected car via links, so may be relevant.

PASSIVE ANTI-THEFT SYSTEM - SYMPTOM CHART

Condition	Possible Sources	Action
No communication with the powertrain control module (PCM).	PCM Circuitry	REFER to MODULE COMMUNICATIONS NETWORK .
The anti-theft indicator is always/never on - engine cranks, but no 3-second anti-theft indicator prove-out	Powertrain control module (PCM) Anti-theft indicator	GO to PINPOINT TEST A .
The anti-theft system does not operate correctly - anti-theft number of programmed keys is below minimum	Number of programmed keys is below minimum Powertrain control module (PCM) Circuitry Passive anti-theft system (PATS) transceiver Unprogrammed key	GO to PINPOINT TEST B .
The anti-theft system does not operate correctly - antenna not connected or damaged transceiver	Passive anti-theft system (PATS) key Powertrain control module (PCM) Circuitry PATS transceiver	Go to PINPOINT TEST C .
The anti-theft system does not operate correctly - passive anti-theft system (PATS) key transponder signal is not received - damaged key or non-PATS key	PATS key Powertrain control module (PCM) Circuitry PATS transceiver	GO to PINPOINT TEST D .
The anti-theft system does not operate correctly - passive anti-theft system (PATS) received incorrect key-code from key transponder (unprogrammed PATS key)	PATS key Powertrain control module (PCM)	GO to PINPOINT TEST E .
The anti-theft system does not operate correctly - passive anti-theft system (PATS) received invalid format of key-code from PATS key transponder (partial key read)	PATS key Powertrain control module (PCM) Circuitry PATS transceiver	GO to PINPOINT TEST F .
The anti-theft system does not operate correctly - passive anti-theft system (PATS) transceiver signal is not received (not connected, damaged or wiring)	PATS key Powertrain control module (PCM) Circuitry PATS transceiver	GO to PINPOINT TEST G .
The vehicle does not start - anti-theft indicator proves out for 3 seconds as normal	Starter relay Powertrain control module (PCM) Circuitry	GO to PINPOINT TEST H .