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Home >> Mercury >> 2009 >> Mariner Base, 2.5 7, AWD >> Repair and Diagnosis >> External Pages >> Different variant/trim >> Section 26 (Anti-Theft System - Passive Anti-Theft System (Pats) - (Hybrid)) >> Description And Operation >> Anti-Theft >> Passive Anti-Theft System (PATS) Function

Passive Anti-Theft System (PATS) Function

WARNING: This page is about a different variant/trim than selected.
NOTE: If the IC or the TCM (or both) is replaced, the parameters must be reset in both modules or the vehicle experiences a PATS no-start. Refer to PASSIVE ANTI-THEFT SYSTEM (PATS) PARAMETER RESET .
NOTE: When using the Integrated Diagnostic System (IDS), the IC and the TCM parameters are reset at the same time.

The PATS function is controlled by the IC. The IC is used to carry out all of the PATS functions such as receiving the identification code from the PATS key, controlling the Electronically Controlled Continuously Variable Transmission (eCVT) and fuel injector(s) enable, and initiating the key interrogation sequence when the ignition key is turned to the ON or START position. Because of the interaction between the IC and the TCM, there are parameters that must be set if the IC or the TCM (or both) is replaced. Refer to PASSIVE ANTI-THEFT SYSTEM (PATS) PARAMETER RESET . 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 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 active only for a few seconds when the vehicle is starting. It is not a PATS concern if the vehicle stalls after it has been running for a minimum of 3 seconds. PATS does not disable a running vehicle.

When operating properly, the Hybrid normally shuts down the engine after it has been idling for approximately 2 minutes, and the anti-theft indicator does not illuminate. As soon as the driver presses the accelerator, the Hybrid either starts the engine and accelerate the vehicle, or the traction motor in the eCVT causes the Hybrid to accelerate. Depending on how much pressure is applied to the accelerator pedal, the TCM determines if only the traction motor engages, or the engine starts, or both the traction motor and the engine causes the Hybrid to accelerate. If the engine shuts down, it can be due to normal Hybrid operation. At this time, always check to see if the anti-theft indicator is flashing or glowing (PATS concern) or if it is not illuminated. PATS always affects the starting of the vehicle, whether the traction motor or the engine (or both) cause the Hybrid to start and accelerate. PATS does not cause a running vehicle to stall.

PATS can cause a vehicle no start due to either the fuel injectors not operating or the TCM not cranking the engine, or both. Always check for PATS DTCs from the IC and the TCM when a no-crank or no-start condition exists. A low state of charge in the vehicle battery can cause the PATS to allow the TCM to crank the engine, but prevent the fuel injectors from operating. If the anti-theft indicator does not prove out (it may be either flashing or glowing steadily) and one (or both) of the previous conditions (fuel injectors and/or engine won't crank) are present, it can be due to a PATS concern. If the anti-theft indicator proves out, it cannot be a PATS concern. If the anti-theft indicator does not illuminate at all, it can be an IC concern. Refer to the SYMPTOM CHART .

The PATS function uses the IC and the TCM to enable or disable the engine. All elements of PATS must be functional before the engine is allowed to start. If any of the components are not working correctly, the vehicle does not start. If there is a PATS concern present, the IC sends a message to the PCM to not allow fuel injector operation and should send a message to the TCM to not start the engine. If the vehicle starts and stalls, or the engine does not start at all, check the anti-theft indicator operation and if flashing or glowing, retrieve DTCs from the IC and the PCM and follow the PATS diagnostics.

PATS is not compatible with 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 also can be the cause of 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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