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Home >> Ford >> 2000 >> Taurus LX, 3.0 2, AX4N >> Repair and Diagnosis >> External Pages >> Different car >> Section 1505 (Anti-Theft System - Passive Anti-Theft System (Pats) - (Except 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 may also be used to prove 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) need(s) 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  was replaced, the parameters in the IC  , and the parameters in the PCM need to be reset. Refer to PASSIVE ANTI-THEFT SYSTEM (PATS) PARAMETER RESET .

When the parameters in the IC  are reset, it clears (erases) the PCM ID from the IC  . A PCM parameter reset causes the PCM to send a PCM ID to the IC  that is necessary for the system to operate. Make sure to cycle the key at least once, then turn the key ON and make an attempt to start the vehicle for 3-5 seconds before attempting more procedures. If only a PCM parameter reset occurs, the ID stored in the IC  does not match the ID being sent by the PCM, and may cause a PATS  -related no-start. Carry out the IC  parameter reset first, then the PCM parameter reset next, and do not cycle the key between these 2 procedures. Note that when using the Integrated Diagnostic System (IDS), the parameters in the IC  and the PCM are reset at the same time.

If the PCM_ID reads Stored, the IC  has a PCM_ID stored. If it reads Not Stored, a parameter reset of the PCM may resolve this issue. If the PCM_VFY PID reads No, the N_KEYCODE PID reads 2 or more and the MASTERKEY PID reads Present, the IC  , and the PCM need to have their parameters reset. Refer to PASSIVE ANTI-THEFT SYSTEM (PATS) PARAMETER RESET .

If the PCM_VFY PID reads No, 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 may 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 . This switch state control does not affect the Key Programming Using Diagnostic Equipment procedure.

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

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