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 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 and to the PCM to allow 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 does not allow the eCVT to start the engine and does 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 does 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 .

The PATS disables the vehicle from starting if there is:

• a damaged PATS key.
• a non-programmed PATS key.
• a non-PATS key (key has no electronics).
• damaged wiring.
• a damaged transceiver.
• a damaged IC.
• a damaged TCM.