Pinpoint Test D: DTC B1602

Anti-Theft

Pinpoint Test D: DTC B1602

Normal Operation
- DTC B1602 (PATS Received Invalid Format Of Key-Code From Ignition Key Transponder) - sets when only a partial Passive Anti-Theft System (PATS) key was read. Remote starter equipment can also cause this DTC.

This pinpoint test is intended to diagnose the following:

- PATS key
- PATS transceiver
- PCM



PINPOINT TEST D: DTC B1602

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 can 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 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 Ford, Rotunda, Strattec, or Huf are approved Ford PATS keys.)

NOTE: Make sure any aftermarket remote start systems have been removed from the vehicle before any PATS-related no-start concerns are investigated.

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D1 RETRIEVE THE DTCs


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

- If only one key is available, cut a new key and program the keys. Refer to Key Programming Using Diagnostic Equipment Using Diagnostic Equipment.
- Ignition ON.
- Clear the DTCs.
- Ignition OFF.
- Ignition ON.
- Retrieve the DTCs.
- Is DTC B1602 retrieved for one or both PATS keys?

Yes
If DTC B1602 is retrieved for one key, REPLACE that key and PROGRAM the new key. REFER to Spare Key Programming - Using Diagnostic Equipment Using Diagnostic Equipment. CLEAR the DTCs. CYCLE the ignition.
REPEAT the self-test.

If DTC B1602 is retrieved for both PATS keys, GO to D2.

No
The system is OK. CHECK all the customer PATS keys by attempting to start the vehicle with each key to verify all the other PATS keys are programmed. The concern may have been caused by interference from another object.

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D2 INSTALL A NEW PATS TRANSCEIVER


NOTE: Replacement of the PATS transceiver does not require the PATS keys to be programmed into the PCM again.

- Ignition OFF.
- Install a new PATS transceiver. Refer to Passive Anti-Theft System (PATS) Transceiver Service and Repair.
- Ignition ON.
- Clear the DTCs.
- Ignition OFF.
- Ignition ON.
- Retrieve the DTCs.
- Are any PATS DTCs retrieved?

Yes
GO to D3.

No
The system is OK. CHECK all the customer PATS keys by attempting to start the vehicle with each key to verify all the other PATS keys are programmed.

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D3 CHECK FOR CORRECT PCM OPERATION


- 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?

Yes
INSTALL a new PCM. PROGRAM the PATS keys into the PCM. REFER to Key Programming Using Diagnostic Equipment Using Diagnostic Equipment. REPEAT the self-test.

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.

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