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Home >> Ford >> 2000 >> Contour SE, 2.5 L, Standard >> Repair and Diagnosis >> External Pages >> Different car >> Section 2133 (Anti-Theft - Passive Anti-Theft System (Pats) - (Hybrid)) >> Diagnostic Tests >> Anti-Theft >> Principles of Operation >> PATS Operation

PATS Operation

WARNING: This page is about a different car, the 2008 Mercury Mariner and 2008 Ford Escape. However, it is still accessible from the selected car via links, so may be relevant.

The PATS function is controlled by the IC. With this type of PATS, there are parameters that need to be reset if either the IC or the TCM (or both) is replaced. Refer to Passive Anti-Theft System (PATS) Parameter Reset . When the PATS key is turned to the ON or START position, the IC initiates the key interrogation sequence by sending a voltage signal to the PATS transceiver. The transceiver then uses its antenna to bounce a signal off the transponder in the PATS key. This process "reads" the PATS key identification code and sends the key identification code back to the IC, which interprets it and determines if it matches one of the stored key codes. If it does match one of the stored key codes, the IC sends messages to the TCM and the PCM to allow eCVT (the eCVT will start the engine) and fuel injector operation. If it does not match one of the stored key codes, or it is only a partial key read or no key read, the IC will not allow the eCVT to start the engine and will not allow fuel injector operation. The anti-theft indicator in the IC will flash (or may glow steadily) and the IC will store one or more DTCs. All elements of PATS must be functional before the vehicle will start. If any of the components are not working correctly, the vehicle will not start. If the IC must be replaced for any reason (PATS concerns or any IC concerns), the PATS keys must be programmed into the new IC. Refer to Integrated Keyhead Transmitter (IKT) Key Programming Using Diagnostic Equipment . Also, if the IC or the TCM (or both) is replaced, the parameters must be reset in both modules in order to calibrate them to each other. Refer to Passive Anti-Theft System (PATS) Parameter Reset . After the parameters are reset in both modules, the ignition must be cycled several times, holding the key in each position for a minimum of 3 seconds. The vehicle may not start until the key has been cycled a minimum of 3 times.

The PATS disables the vehicle from starting if there is:

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