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

WARNING: This page is about a different car, the 2006 Mercury Mariner and 2006 Ford Escape. 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 passive anti-theft system (PATS) ignition key may cause vehicle starting concerns and record DTCs under certain conditions. If a fault cannot be identified, examine the customer's key ring for such objects or devices. If present, inform the customer that they need to keep these objects from touching the PATS ignition key while starting the engine. These objects and devices cannot damage the PATS ignition key, but can cause a momentary problem if they are too close to the key during engine start. If a problem occurs, turn the ignition to the OFF position and restart the engine with all other objects on the key ring held away from the ignition key. Check to make sure the encoded ignition key used by the customer is an approved encoded ignition key (encoded ignition keys from Huf, Rotunda, or Strattec are approved encoded ignition keys).
  1. D1 RETRIEVE THE DTCS 
    • Enter the following diagnostic mode on the diagnostic tool: CLEAR the PCM DTCs.
    • Key in OFF position.
    • Key in ON position.
    • Enter the following diagnostic mode on the diagnostic tool: RETRIEVE the PCM DTCs.
    • Is DTC B1602 retrieved? 

    Yes  : GO to D2.

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

  2. D2 REPLACE THE ENCODED IGNITION KEY 
    NOTE: Check to make sure the customer key and the replacement encoded ignition keys are approved encoded PATS ignition keys. Unapproved PATS keys do not always operate correctly over different temperature ranges (encoded ignition keys from Huf, Rotunda, or Strattec are approved encoded ignition keys).
    • Cut a new encoded ignition key.
    • Program the new encoded ignition 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: RETRIEVE the PCM DTCs.
    • Is DTC B1602 retrieved? 

    Yes  : GO to D3.

    No  : If DTCs other than PATS PCM DTCs are retrieved, REFER to MULTIFUNCTION ELECTRONIC MODULES .

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

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

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

    No  : The system is OK.

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