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Home >> Ford >> 2000 >> Contour SE, 2.0 3, Standard >> Repair and Diagnosis >> External Pages >> Different car >> Section 2133 (Anti-Theft - Passive Anti-Theft System (Pats) - (Hybrid)) >> Diagnostic Tests >> Anti-Theft >> Principles of Operation >> PATS Parameter Identification (PIDs)

PATS Parameter Identification (PIDs)

WARNING: This page is about a different car, the 2008 Mercury Mariner and 2008 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) will determine if the key is a programmed key and will also 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 will start. Viewing the N_KEYCODE (number of keys programmed) PID will determine if the minimum number of keys have been programmed into the IC. If the N_KEYCODE PID reads 0 or 1, additional key(s) will need 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 NOTPREST, that particular key must be programmed into the IC. If the N_KEYCODE PID reads 1, and the MASTERKEY PID reads PRESNT, that particular key is already programmed into the IC. If the IC was replaced, the parameters in the IC, and the parameters in the TCM will need to be reset.

When the parameters in the IC are reset, it clears (erases) the TCM ID from the IC. A TCM parameter reset will cause the TCM to send a TCM 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 TCM parameter reset occurs, the ID stored in the IC will not match the ID being sent by the TCM, and may cause a PATS-related no-start. Carry out the IC parameter reset first, then the TCM parameter reset next, and do not cycle the key between these 2 procedures.

If the TCM ID PID reads STORED, the IC has a TCM ID stored. If it reads NOTSTRD, a parameter reset of the TCM may resolve this issue. If the PCM_VFY PID reads NO, and the N_KEYCODE PID reads 2 or more and the MASTERKEY PID reads PRESNT, the IC, and the TCM will 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 PRESNT, or if the N_KEYCODE PID reads 0 and the MASTERKEY PID reads NOTPRESNT, a minimum of 2 keys will 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 NOTPRESNT after programming, this may indicate a defective key. The SPAREKEY PID is defaulted to ENABLE. With the SPAREKEY PID displaying ENABLE, the IC will accept 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 DISABL if the customer wants to disable the customer spare key programming function. Refer to Key Programming Switch State Control  in this article to change the state of the SPAREKEY PID. This switch state control does not affect the Key Programming Using Diagnostic Equipment procedure.

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

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