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  • MrShift@Edmunds 01/25/12 3:06 pm PST

    Well glad it wasn't more complicated, although I'm a bit puzzled by Ford's diagnosis. Not sure that alone would trigger the anti-theft, but I'm not sure, so let's hope for the best!


    anyway, here's how your system works in case something comes up again:

    The Passive Anti-theft System (PATS) contains the following components:

    • theft indicator
    • encoded ignition key
    • transceiver module
    • PATS control module (located behind the passenger side air bag module)
    • Powertrain Control Module (PCM)
    • Standard Corporate Protocol (SCP) communication network

    The passive anti-theft system (PATS) uses radio frequency identification technology to deter a driveaway theft. Passive means that it does not require any activity from the user. This system is known as SecuriLock(R) in North America, Safeguard(R) in the U.K., and PATS in continental Europe. This information can he found in customer literature such as the Owners Guide.

    The PATS uses a specially-encoded ignition key. Each encoded ignition key contains a permanently installed electronic device called a transponder. Each transponder contains a unique electronic identification code out of over 72 million billion combinations.

    Each encoded ignition key must be programmed into a vehicle's PATS module before it can be used to start the engine. There are special diagnostic repair procedures outlined in this manual that must be performed if the encoded ignition keys need to be replaced.

    The encoded key is larger than a traditional ignition key. The key does not require batteries and should last the life of the vehicle.

    The transceiver module communicates with the encoded ignition key. This module is located behind the steering column shroud, and contains an antenna connected to a small electronics module. During each vehicle start sequence, the transceiver module reads the encoded ignition key identification code and sends the data to the PATS module.

    The control functions are contained in the PATS module. This module performs all of the PATS functions such as receiving the identification code from the encoded ignition key and controlling engine enable. The PATS module initiates the key interrogation sequence when the vehicle ignition switch is turned to RUN or START.

    PATS uses the powertrain control module (PCM) to enable or disable the engine. The PATS module communicates with the PCM over the SCP communication network in order to enable engine operation. The PATS module and the PCM use sophisticated messages in order to prevent a theft. The PATS and the PCM share security data when first installed together, making them a matched pair. After this security data sharing, these modules will not function in other vehicles. The PCM shared security ID is remembered even if the battery is disconnected. The PATS module also stores the vehicle's key identification code, even if the battery is disconnected. There are special diagnostic repair procedures outlined in this workshop manual that may be carried out if either the PATS module or the PCM needs replacement.

    All the elements of PATS must be functional before the engine is allowed to start. If any of the components are not working correctly, the vehicle will not start.

    PATS uses a visual theft indicator. This indicator will prove out for three seconds when the ignition switch is turned to RUN or START under normal operation. If there is a PATS problem, this indicator will either flash rapidly or glow steadily when the ignition switch is turned to RUN or START. PATS also "blips" the theft indicator every two seconds at ignition OFF to act as a visual theft deterrent.

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