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Home >> Ford >> 2006 >> Focus ZX5 SE, Standard >> Repair and Diagnosis >> External Pages >> Different car >> Section 1341 (Anti-Theft System - Passive Anti-Theft System (Pats) - (Hybrid)) >> Diagnosis And Testing >> Anti-Theft >> Principles of Operation >> Passive Anti-Theft System (PATS) Operation

Passive Anti-Theft System (PATS) Operation

WARNING: This page is about a different car, the 2010 Mercury Mariner and 2010 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  to allow the eCVT  to crank the engine or enable electric drive. 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  does not allow the eCVT  to start the engine or enable electric drive. 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 any IC  concerns), the PATS  keys must be programmed into the new IC  . Refer to INTEGRATED KEYHEAD TRANSMITTER (IKT) KEY PROGRAMMING USING DIAGNOSTIC EQUIPMENT  .

PATS  is not compatible with non-Ford aftermarket remote start systems, which allow the vehicle to be started from the exterior of the vehicle. These systems can reduce the security of the vehicle, and can also cause no-start concerns. Remote start systems must be removed from the vehicle before any PATS  -related no-start concerns are investigated.

PATS  disables the vehicle from starting if there is:

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