Pinpoint Test C: DTC B1601

Anti-Theft

Pinpoint Tests

Pinpoint Test C: DTC B1601

Normal Operation
- DTC B1601 ( PATS Received Incorrect Key-Code From Ignition Key Transponder) - sets when there is an unprogrammed Passive Anti-Theft System (PATS) key. There is no issue with the PATS key itself, but the key must be programmed into the PATS memory (unless the maximum number of keys are already programmed).

This pinpoint test is intended to diagnose the following:

- PATS key
- PCM

PINPOINT TEST C: DTC B1601

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 switch 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: Only 8 PATS keys can be programmed into the PCM using the Key Programming Using Diagnostic Equipment Key Programming Using Diagnostic Equipment procedure unless the unlimited key mode is active. If the N_KEYCODE PID reads more than 2, the concern may be the PATS key being used is an unprogrammed key. Verify this by also viewing the MASTERKEY PID. It must read Present for the key to be valid.

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C1 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 Key Programming Using Diagnostic Equipment.
- If both keys are available, program the keys. Refer to Key Programming Using Diagnostic Equipment Key Programming Using Diagnostic Equipment.
- Ignition ON.
- Clear the DTCs.
- Ignition OFF.
- Ignition ON.
- Retrieve the DTCs.
- Is DTC B1601 retrieved for one or both PATS keys?

Yes
If DTC B1601 is retrieved for one PATS key, REPLACE that key and PROGRAM all the keys. REFER to Key Programming Using Diagnostic Equipment Key Programming Using Diagnostic Equipment. CLEAR the DTCs. CYCLE the ignition. REPEAT the self-test.

If DTC B1601 is retrieved for both PATS keys, GO to C2.

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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C2 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. REFER to Electronic Engine Controls Service and Repair. PROGRAM the PATS keys into the PCM. REFER to Key Programming Using Diagnostic Equipment Key Programming 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.

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