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Powertrain control module (incorporating PATS)
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Passive anti - theft system transceiver
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Passive anti - theft system transponder
Passive Anti - Theft System (PATS)
The Passive Anti - Theft System (PATS) is fully passive in operation and requires no special procedures by the driver to arm or disarm the system. It is invisible to normal scrutiny and is operated by a miniature transponder within the key body. This communicates with the module through a transceiver mounted around the ignition switch lock barrel.
The PATS functionality is incorporated within the powertrain control module.
PATS may be identified by a larger sized ignition key which indicates the presence of the transponder that controls the system.
The PATS transponder key is unique to Ford Focus and is identified by a blue insert. Previous PATS transponder keys that have a red insert are not compatible with the Ford Focus and must not be used.
The transponder code reading is carried out when the key, having been inserted into the ignition lock barrel, is turned from position 0 to position III to crank the engine. If the PCM receives the correct code, the engine will start. If the PCM receives either no code or an incorrect code, the engine will not crank as the PATS is still armed and the engine is still immobilised.
Anti - Theft Indicator
Whenever the ignition is switched on the anti - theft indicator will remain on for three seconds while the system carries out an initial ignition key read.
The anti - theft indicator will flash rapidly or glow continuously after the initial three seconds to indicate the PATS has immobilised the vehicle.
For additional information on the PATS fault codes, refer to the Diagnosis and Testing section.
