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Pinpoint Test D: DTC B1602-Pats Received Invalid Format Of Key-Code From Ignition Key Transponder

WARNING: This page is about a different car, the 2006 Mercury Montego, 2006 Ford Freestyle, and 2006 Ford Five Hundred. However, it is still accessible from the selected car via links, so may be relevant.
NOTE: Large metallic objects, electronic devices on the key chain that can be used to purchase gasoline or similar items, or a second key on the same key ring as the PATS key may cause vehicle starting concern and record DTCs under certain conditions. If a fault cannot be identified, examine the customer key ring for such objects or devices. If present, inform the customer that they need to keep these objects from touching the PATS key while starting the engine. These objects and devices cannot damage the PATS key, but can cause a momentary concern if they are too close to the key during engine start. If a concern occurs, turn the ignition OFF and restart the engine with all other objects on the key ring held away from the ignition key. Check to make sure the PATS key used by the customer is an approved Ford PATS key. PATS keys from Rotunda or Strattec are approved Ford PATS keys.
  1. D1 RETRIEVE THE DIAGNOSTIC TROUBLE CODES (DTCS) 
    • Enter the following diagnostic mode on the diagnostic tool: Clear the DTCs.
    • Key in OFF position.
    • Key in ON position.
    • Enter the following diagnostic mode on the diagnostic tool: Retrieve the DTCs.
    • Is DTC B1602 retrieved? 

    Yes:  GO to  D2.

    No:  The system is OK. CHECK all the customer PATS keys by cycling them in the ignition switch and determining if the vehicle starts.

  2. D2 CHECK PROGRAMMING WITH A NEW PATS KEY 
    NOTE: Check to make sure the customer keys and new PATS keys are approved Ford encoded PATS keys. Unapproved PATS keys do not always operate correctly over different temperature ranges. PATS keys from Rotunda or Strattec are approved Ford PATS keys.
    • Cut a new PATS key.
    • Program a new PATS key. Refer to KEY PROGRAMMING USING DIAGNOSTIC EQUIPMENT .
    • Key in OFF position.
    • Key in ON position.
    • Enter the following diagnostic mode on the diagnostic tool: CLEAR the DTCs.
    • Enter the following diagnostic mode on the diagnostic tool: Retrieve the DTCs.
    • Is DTC B1602 retrieved? 

    Yes:  GO to  D3.

    No:  If other than PATS PCM DTCs are retrieved, REFER to INTRODUCTION - GASOLINE article. If no PATS DTCs are retrieved, the system is OK.

  3. D3 INSTALL A NEW PATS TRANSCEIVER 
    • Enter the following diagnostic mode on the diagnostic tool: Clear the DTCs.
    • Key in OFF position.
    • Install a new PATS transceiver module. Refer to PASSIVE ANTI-THEFT SYSTEM (PATS) TRANSCEIVER .
    • Key in ON position.
    • Enter the following diagnostic mode on the diagnostic tool: CLEAR the DTCs.
    • Enter the following diagnostic mode on the diagnostic tool: Retrieve the DTCs.
    • Are any PATS DTCs retrieved? 

    Yes:  Refer to the PASSIVE ANTI-THEFT SYSTEM (PATS) - DIAGNOSTIC TROUBLE CODES (DTC) INDEX .

    No:  The system is OK.

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