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Home >> Ford >> 2009 >> Flex Limited, FWD >> Repair and Diagnosis >> External Pages >> Different car >> Section 936 (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 Ford Ranger. 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 (master key) PID (with both keys) will determine if the key is a programmed key and will also prove out the transceiver, circuitry and the instrument cluster. A master key is only a key that is programmed into the instrument cluster.

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 instrument cluster. There must be at least 2 keys programmed into the instrument cluster 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 instrument cluster. If the N_KEYCODE PID reads 0 or 1, additional key(s) will need to be programmed into the instrument cluster 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 instrument cluster. If the N_KEYCODE PID reads 1, and the MASTERKEY PID reads PRESNT, that particular key is already programmed into the instrument cluster.

If the instrument cluster was replaced, the parameters in the instrument cluster, and the parameters in the PCM will need to be reset. When the parameters in the instrument cluster are reset, that clears (erases) the PCM ID from the instrument cluster. A PCM parameter reset will send a PCM ID to the instrument cluster that is necessary for the system to operate.

If the PCM_ID reads STORED, the instrument cluster has a PCM ID stored. If it reads NOTSTRD, a parameter reset of the PCM may resolve this issue.

If the ENABLE_S reads NO, and the N_KEYCODE reads 2 or more and the MASTERKEY reads PRESNT, the instrument cluster, then the PCM will need to have their parameters reset. If the ENABLE_S reads NO, and the N_KEYCODE reads 1 and the MASTERKEY reads PRESNT, or if the N_KEYCODE reads 0 and the MASTERKEY reads NOTPRESNT, a minimum of 2 keys will need to be programmed into the instrument cluster. Refer to Key Programming Using Diagnostic Equipment  in this article. If the MASTERKEY continues to read NOTPRESNT after programming, this may indicate a defective key.

The SPAREKEY (spare key) PID is defaulted to ENABLE. With the SPAREKEY PID displaying ENABLE, the instrument cluster will accept more than 2 keys (up to a maximum of 8) being programmed into the instrument cluster. Refer to Key Programming Using Two Programmed Keys  in this article. It can be toggled to DISABL if the customer does not want any more than 2 keys programmed into the instrument cluster. Refer to Key Programming Switch State Control  in this article. This switch state control does not affect the Key Programming Using Diagnostic Equipment, the Spare Key Programming - Unlimited Key Mode, or the Spare Key Programming - Using Diagnostic Equipment procedures.

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

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