Pinpoint Test I: DTC B2431

Anti-Theft

Pinpoint Tests

Pinpoint Test I: DTC B2431

Normal Operation

During each vehicle start sequence, when the key is turned to the START or ON position, the Passive Anti-Theft System (PATS) transceiver reads the PATS key identification code and sends the data to the Instrument Cluster (IC). During the PATS key programming, the PATS key transponder ID is sent to the IC, where it is verified if it is a valid transponder ID or not. If the IC determines it is an invalid transponder ID, DTC B2431 will be set.

- DTC B2431 (Transponder Programming Failed) - a continuous DTC that sets when there was a failure during the key programming procedure and a bad transponder (in the PATS key) may cause this DTC.

This pinpoint test is intended to diagnose the following:

- PATS key programming concern
- PATS key concern (transponder)



PINPOINT TEST I: DTC B2431

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I1 CHECK BOTH PATS KEYS


NOTE: Check to make sure the new PATS keys are approved Ford encoded PATS keys. Unapproved PATS keys do not always operate correctly over various temperature ranges. (PATS keys from Ford, Rotunda, Strattec or Huf are approved Ford PATS keys.)

NOTE: Follow this procedure using both PATS keys (using one at a time).

- Obtain both PATS keys from the customer and follow the procedure using one PATS key, then the other. If the customer only has one PATS key, it will be necessary to cut a new PATS key (does not have to be an IKT key).
- If it is necessary to cut a new PATS key, cut the new key to match the original key. Program the PATS keys. Refer to Integrated Keyhead Transmitter (IKT) Key Programming Using Diagnostic Equipment Using Diagnostic Equipment.
- Ignition ON.
- Clear the DTCs.
- Ignition OFF.
- Ignition ON.
- Retrieve the DTCs.
- Is DTC B2431 present with either key?

Yes
CUT a new key to replace the damaged key (the key that DTC B2431 is still present with). DISCARD the damaged key. PROGRAM the keys. REFER to Integrated Keyhead Transmitter (IKT) Key Programming Using Diagnostic Equipment Using Diagnostic Equipment. CLEAR the DTCs. CYCLE the ignition. REPEAT the self-test. TEST the system for normal operation.

No
If DTCs other than PATS IC DTCs are retrieved, REFER to Body Control Systems.

If no PATS IC DTCs are retrieved, the system is OK.

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