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Home >> Ford >> 2009 >> Flex Limited, FWD >> Repair and Diagnosis >> External Pages >> Different car >> Section 2013 (Anti-Theft System - Passive Anti-Theft System (Pats)) >> Diagnosis And Testing >> Anti-Theft >> Principles of Operation >> Passive Anti-Theft System (PATS) Transceiver

Passive Anti-Theft System (PATS) Transceiver

WARNING: This page is about a different car, the 2010 Lincoln MKX and 2010 Ford Edge. However, it is still accessible from the selected car via links, so may be relevant.

The PATS  transceiver is located under the steering column shroud and communicates with the encoded ignition key. During each vehicle start sequence, the PATS  transceiver reads the encoded ignition key identification code and sends data to the IC  . The IC  validates the code, and if it is the correct code, sends a message to the PCM to ground the starter relay solenoid coil and to also allow the fuel injectors to operate. Refer to PASSIVE ANTI-THEFT SYSTEM (PATS) TRANSCEIVER . Passive Anti-Theft System (PATS) Operation 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 PCM (or both) are 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 a message to the PCM to ground the starter relay solenoid coil and to also allow the fuel injectors to operate. 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  sends a message to the PCM to not ground the starter relay solenoid coil and not allow fuel injector operation. The anti-theft indicator in the IC  flashes (or may glow steadily) and the IC  stores one or more DTCs. All elements of PATS  must be functional before the vehicle starts. If any of the components are not working correctly, the vehicle cannot start. If the IC  must be replaced for any reason (PATS  concerns or IC  concerns), the PATS keys must also be programmed into the new IC  . Refer to INTEGRATED KEYHEAD TRANSMITTER (IKT) KEY PROGRAMMING USING DIAGNOSTIC EQUIPMENT .

PATS  disables the vehicle from starting if there is:

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