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. The concern may not be with the PATS key itself, but possibly the key may need to 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
- PATS transceiver
- Instrument Cluster (IC)



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 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 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, Huf are approved Ford PATS keys).

NOTE: Only 8 PATS keys can be programmed into the IC during normal programming procedures (unless the unlimited key mode is enabled). If the N_KEYCODE PID reads more than 2 and less than 8, 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 Using Diagnostic Equipment.
- If both keys are available, program the keys. Refer to Key Programming Using Diagnostic Equipment Using Diagnostic Equipment.
- Ignition OFF.
- Connect the scan tool.
- Ignition ON.
- Enter the following diagnostic mode on the scan tool: Clear the IC DTCs.
- Ignition OFF.
- Ignition ON.
- Enter the following diagnostic mode on the scan tool: Retrieve the IC DTCs.
- Using all existing keys, then the newly programmed key (if present), is DTC B1601 present?

Yes
If DTC B1601 was present for both existing keys and the new key, GO to C2.

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

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

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C2 CHECK THE PATS TRANSCEIVER


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

- Ignition OFF.
- Install a new PATS transceiver. Refer to Passive Anti-Theft System (PATS) Transceiver Service and Repair.
- Ignition ON.
- Enter the following diagnostic mode on the scan tool: Clear the IC DTCs.
- Ignition OFF.
- Ignition ON.
- Enter the following diagnostic mode on the scan tool: Retrieve the IC DTCs.
- Is DTC B1601 retrieved for either of the PATS keys?

Yes
GO to C3.

No
If other than PATS DTCs are retrieved, REFER to Instrument Panel, Gauges and Warning Indicators.

If other PATS DTCs are retrieved, REFER to DTC Charts. Anti-Theft - Passive Anti-Theft System (PATS)

If no DTCs are retrieved, the system is OK.

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C3 CHECK FOR CORRECT IC OPERATION


- Disconnect the IC connector.
- Check for:
- corrosion
- damaged pins
- pushed-out pins
- Connect the IC connector and make sure it seats correctly.
- Operate the system and verify the concern is still present.
- Is the concern still present?

Yes
INSTALL a new IC. REFER to Instrument Panel, Gauges and Warning Indicators. RESET the parameters in both the IC and the PCM. REFER to Passive Anti-Theft System (PATS) Parameter Reset Passive Anti-Theft System (PATS) Parameter Reset. PROGRAM the PATS keys into the new IC. 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.

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