Pinpoint Test B: DTC B1600 - Pats Ignition Key Transponder Signal Is Not Received

WARNING: This page is about a different car, the 2007 Lincoln Mark LT and 2007 Ford Pickup. However, it is still accessible from the selected car via links, so may be relevant.

NOTE: Large metallic objects, electronic devices on the key ring 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 a 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 key 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 Ford, Rotunda, Strattec, or HUF are approved Ford PATS keys.)

B1 RETRIEVE THE DTCs
- Key in ON position.
- 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?
1. YES : Go to B2.
2. NO : If DTCs other than PATS PCM DTCs are retrieved, REFER to the Content Not Found article.
  If no PATS DTCs are retrieved, the system is OK. The concern may have been caused by interference from another object.
B2 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.)
- 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.
- If it is necessary to cut a new PATS key, program the new PATS key. Refer to Key Programming Using Diagnostic Equipment in this article.
- Key in ON position.
- 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
- Using either existing key or the new key, is DTC B1600 present?
1. YES : If DTC B1600 was present for both existing keys and the new key, go to B3 .
  If DTC B1600 was not present with the new key, the original key may be damaged and should be replaced. CUT a new key to replace the damaged key. PROGRAM the new PATS key. REFER to Key Programming Using Diagnostic Equipment in this article. CLEAR the DTCs. REPEAT the self-test.
2. NO : If DTCs other than PATS PCM DTCs are retrieved, REFER to the INTRODUCTION - GASOLINE ENGINES article. If no PATS DTCs are retrieved, the system is OK. The concern may have been caused by interference from another object.
B3 INSTALL A NEW PATS TRANSCEIVER
NOTE: Replacement of the PATS transceiver does not require the PATS keys to be programmed into the PCM again.

NOTE: Do not use the PATS key that may have been programmed in Step B2.
- Key in OFF position.
- Install a new PATS transceiver. Refer to Passive Anti-Theft System (PATS) Transceiver in this article.
- Key in ON position.
- Enter the following diagnostic mode on the diagnostic tool: Clear the DTCs
- Key in OFF position.
- Key in ON position.
- Turn the key to the ON position using an existing customer PATS key.
- Enter the following diagnostic mode on the diagnostic tool: Retrieve the DTCs
- Is DTC B1600 retrieved?
1. YES : Go to B4.
2. NO : The system is OK.
B4 CHECK FOR CORRECT PCM OPERATION
NOTE: When a new PCM is installed, the PATS keys must be programmed into the PCM.
- Disconnect all the PCM connectors.
- Check for:
  - corrosion
  - damaged pins
  - pushed-out pins
- Connect all the PCM connectors and make sure they seat correctly.
- Operate the system and verify the concern is still present.
- Is the concern still present?
1. YES : INSTALL a new PCM. REFER to ELECTRONIC ENGINE CONTROLS article. PROGRAM the PATS keys into the PCM. REFER to Key Programming Using Diagnostic Equipment in this section. REPEAT the self-test.
2. NO : The system is operating correctly at this time. The concern may have been caused by a loose or corroded connector. CLEAR the DTCs. CYCLE the ignition. REPEAT the self-test.