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Home >> Ford >> 2009 >> Flex Limited, FWD >> Repair and Diagnosis >> External Pages >> Different car >> Section 1118 (Anti-Theft System - Passive Anti-Theft System (Pats)) >> Diagnostic Tests >> Anti-Theft >> Principles of Operation >> PATS Parameter Identification (PIDs)

PATS Parameter Identification (PIDs)

WARNING: This page is about a different car, the 2007 Lincoln MKX and 2007 Ford Edge. 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 MASTER KEY PID (with both keys) will determine 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_KEY (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 MASTER KEY PID reads NOTPREST, that particular key must be programmed into the IC. If the N_KEYCODE PID reads 1, and the MASTER KEY 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 PCM will need to be reset.

When the parameters in the IC are reset, it clears (erases) the PCM ID from the IC. A PCM parameter reset will cause 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 will 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.

If the PCM ID reads STORED, the IC has a PCM ID stored. If it reads NOTSTRD, a parameter reset of the PCM may resolve this issue. If the PCM VER reads NO, and the N_KEYCODE reads 2 or more and the MASTER KEY reads PRESNT, the IC, and the PCM will need to have their parameters reset. Refer to Passive Anti-Theft System (PATS) Parameter Reset . In this particular scenario, PCMENABLE will read NO.

If the PCM VER reads NO, and the N_KEYCODE reads 1 and the MASTER KEY reads PRESNT, or if the N_KEYCODE reads 0 and the MASTER KEY 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 MASTER KEY continues to read NOTPRESNT after programming, this may indicate a defective key. The SPARE KEY PID is defaulted to ENABLE. With the SPARE KEY 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 . 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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