Pinpoint Test B: PATS Ignition Key Transponder Signal Is Not Received: Testing

WARNING: This page is about a different car, the 2005 Mercury Montego, 2005 Ford Freestyle, and 2005 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 passive anti-theft system (PATS) key may cause vehicle starting concerns 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.

B1 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 B1600 retrieved?
- Yes : GO to B2.
- No : If other than PATS powertrain control module (PCM) DTCs are retrieved, REFER to the INTRODUCTION - GASOLINE article .
  If no PATS DTCs are retrieved, the system is OK.
B2 CHECK 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 the new PATS key. Refer to KEY PROGRAMMING USING DIAGNOSTIC EQUIPMENT .
- 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 B1600 present?
- Yes : GO to B3.
- No : If other than PATS PCM DTCs are retrieved, REFER to the INTRODUCTION - GASOLINE article .
  If no PATS DTCs are retrieved, the system is OK.
B3 INSTALL A NEW PATS TRANSCEIVER
NOTE: When a new PCM is installed, the PATS keys must be reprogrammed.
- 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 DTCs.
- Key in OFF position.
- Key in ON position.
  NOTE: Do not use the PATS key that was programmed in Step B2.
  
  Turn the ignition switch to ON using an existing customer PATS key.
- Enter the following diagnostic mode on the diagnostic tool: Retrieve the DTCs.
- Is DTC B1600 retrieved?
- Yes : INSTALL a new PCM. REFER to ELECTRONIC ENGINE CONTROLS . REPROGRAM the PATS keys. REFER to KEY PROGRAMMING USING DIAGNOSTIC EQUIPMENT . TEST the system for normal operation.
- No : The system is OK.