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Home >> Ford >> 2000 >> Taurus LX, 3.0 2, AX4N >> Repair and Diagnosis >> External Pages >> Different car >> Section 1507 (Anti-Theft System - Passive Anti-Theft System (Pats) - (Hybrid)) >> Diagnosis And Testing >> Anti-Theft >> Principles of Operation >> Passive Anti-Theft System (PATS) PIDs

Passive Anti-Theft System (PATS) PIDs

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.

Monitoring the PATS  PIDs can be very useful in determining which diagnostic steps to follow. Viewing the MASTERKEY (verifies if the key is programmed) PID with both keys determines if the key is a programmed key and also proves-out the transceiver, circuitry and the IC  . A master key is any key that is programmed into the IC  . Viewing the MIN_KEYS (minimum number of keys) PID (this PID does not change) determines the minimum number of keys that must be programmed into the IC  . There must be at least 2 keys programmed into the IC  in this type of PATS  before the vehicle starts. Viewing the N_KEYCODE (number of keys programmed) PID determines if the minimum number of keys have been programmed into the IC  . If the N_KEYCODE PID reads 0 or 1, additional key(s) needs to be programmed into the IC  in order to meet the minimum of 2 keys. If the N_KEYCODE PID reads 0 or 1, and the MASTERKEY PID reads Not Present, that particular key must be programmed into the IC  . If the N_KEYCODE PID reads 1, and the MASTERKEY PID reads Present, that particular key is already programmed into the IC  . If the IC  is replaced, the parameters in the IC  , and the parameters in the TCM  need to be reset.

When the parameters are reset, it clears (erases) the TCM  ID from the IC  and the IC  ID from the TCM  . Make sure to cycle the key at least once, then turn the key to the ON position and make an attempt to start the vehicle for 3-5 seconds before attempting more procedures. If only a TCM  parameter reset occurs (if a TCM  is replaced), the ID stored in the IC  does not match the ID being sent by the TCM  , and can cause a PATS  -related no-start. Carry out the parameter reset in order to resolve these concerns.

If the TCM  ID PID (the scan tool displays the TCM  ID as: PCM_ID) reads Stored, the IC  has a TCM  ID stored. If it reads Not Stored, a parameter reset of the TCM  can resolve this concern. If the PCM_VFY PID reads No, and the N_KEYCODE PID reads 2 or more and the MASTERKEY PID reads Present, the IC  , and the TCM  need to have their parameters reset. Refer to PASSIVE ANTI-THEFT SYSTEM (PATS) PARAMETER RESET .

If the PCM_VFY PID reads No, and the N_KEYCODE PID reads 1 and the MASTERKEY PID reads Present, or if the N_KEYCODE PID reads 0 and the MASTERKEY PID reads Not Present, a minimum of 2 keys need to be programmed into the IC  . Refer to INTEGRATED KEYHEAD TRANSMITTER (IKT) KEY PROGRAMMING USING DIAGNOSTIC EQUIPMENT .

If the MASTERKEY PID continues to read Not Present after programming, this can indicate a damaged key. The SPAREKEY PID is defaulted to ENABLE. With the SPAREKEY PID displaying ENABLE, the IC  accepts more than 2 keys (up to a maximum of 8) being programmed into the IC  using KEY PROGRAMMING USING TWO PROGRAMMED KEYS . It can be toggled to DISABLE if the customer wants to disable the customer spare key programming function. Refer to KEY PROGRAMMING SWITCH STATE CONTROL  to change the state of the SPAREKEY PID. This switch state control affects the Key Programming Using Two Programmed Keys procedure.

In summary, for the vehicle to start, the PATS  PIDs and their correct state are:

NOTE: The TCM  ID PID in the IC  is displayed by the Integrated Diagnostic System (IDS) scan tool as PCM_ID
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