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Pinpoint Test C: DTC B1601




Anti-Theft

Pinpoint Tests

Pinpoint Test C: DTC B1601

Normal Operation

The Passive Anti-Theft System (PATS) transceiver communicates with the PATS key. During each vehicle start sequence, the PATS transceiver reads the PATS key identification code and sends the data to the Instrument Cluster (IC). The IC then sends a message to the PCM. The PCM carries out the function of controlling the engine enable. The IC initiates the key interrogation sequence when the key is turned to the ON or START position.

- DTC B1601 (PATS Received Incorrect Key-Code From Ignition Key Transponder) - sets when there is an unprogrammed PATS key. The concern is not 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
- 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 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 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, and 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 (number of keys programmed) 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 (master key) PID. It must read Present for the key to be valid.

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C1 RETRIEVE THE DTCs


- Clear the continuous IC DTCs.
- Ignition OFF.
- Ignition ON.
- Retrieve the IC DTCs.
- Is DTC B1601 retrieved?

Yes
GO to C2.

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

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C2 CHECK FOR PROGRAMMED ENCODED IGNITION KEYS - MONITOR THE IC N_KEYCODE PID


- Enter the following diagnostic mode on the scan tool: IC DataLogger.
- Monitor the IC N_KEYCODE PID.
- Does the IC N_KEYCODE PID display 8?

Yes
PROGRAM the keys. REFER to Key Programming Using Diagnostic Equipment Using Diagnostic Equipment. CLEAR the DTCs. REPEAT the self-test.

No
GO to C3.

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C3 CHECK THE NUMBER OF PROGRAMMED IGNITION KEYS AVAILABLE


- Verify there are at least 2 currently programmed PATS ignition keys available with the vehicle.
- Are at least 2 currently programmed PATS ignition keys available with the vehicle?

Yes
GO to C4.

No
CUT a new PATS ignition key so that at least 2 PATS ignition keys are available. PROGRAM the PATS ignition keys. REFER to Key Programming Using Diagnostic Equipment Using Diagnostic Equipment. GO to C5.

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C4 VERIFY THE IC SPAREKEY PID INDICATES YES


- Enter the following diagnostic mode on the scan tool: IC DataLogger.
- Monitor the IC SPAREKEY PID.
- Does the IC SPAREKEY PID indicate ENABLED?

Yes
Spare key programming is enabled. PROGRAM the keys. REFER to Key Programming Using Two Programmed Keys Using Two Programmed Keys. CLEAR the DTCs. REPEAT the self-test.

No
ENABLE the IC PID SPAREKEY. REFER to Key Programming Switch State Control Switch State Control. CLEAR the DTCs. REPEAT the self-test.

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C5 CHECK THE PATS IGNITION KEYS FOR CORRECT OPERATION


- Ignition OFF.
- Turn the key to ON for 3 seconds using the first PATS ignition key.
- Ignition OFF.
- Turn the key to ON for 3 seconds using the second PATS ignition key.
- Start the vehicle using the second PATS ignition key.
- Does the vehicle start?

Yes
The system is OK. If there are additional keys that need to be programmed, REFER to Key Programming Using Two Programmed Keys Using Two Programmed Keys.

No
GO to C6.

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C6 RETRIEVE THE DTCs - CHECK FOR DTC B1601


- Clear the continuous IC DTCs.
- Ignition OFF.
- Ignition ON.
- Retrieve the IC DTCs.
- Is DTC B1601 retrieved?

Yes
GO to C7.

No
The system is OK.

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C7 CHECK FOR CORRECT IC OPERATION


NOTE: When a new IC is installed, the PATS keys must be programmed into the IC.

NOTE: When a new IC is installed, the parameters must be reset in the IC and the PCM.

- 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. 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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