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Pinpoint Test D: DTC B1602




Anti-Theft

Pinpoint Tests

Pinpoint Test D: DTC B1602

Refer to Wiring Diagram Set 112, Passive Anti-Theft System for schematic and connector information. Diagrams By Number

Normal Operation
- DTC B1602 ( PATS Received Invalid Format Of Key-Code From Ignition Key Transponder) - sets in continuous memory and on-demand when only a partial Passive Anti-Theft System (PATS) key was read.

This pinpoint test is intended to diagnose the following:

- PATS key
- PATS transceiver
- Instrument Cluster (IC)

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 may cause 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, 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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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 Key Programming Using Diagnostic Equipment.
- Ignition OFF.
- Connect the scan tool.
- Ignition ON.
- Clear the IC DTCs.
- Ignition OFF.
- Ignition ON.
- Retrieve the IC 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 Key Programming Using Diagnostic Equipment Key Programming 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 other PATS keys are programmed.

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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 IC again.

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

Yes
INSTALL the original transceiver. 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 other PATS keys are programmed.

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D3 CHECK FOR CORRECT IC OPERATION

- Disconnect all the IC connectors.
- Check for:
- corrosion
- damaged pins
- pushed-out pins

- Connect all the IC 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 IC. REFER to Instrumentation and Warning Chimes Instrument Cluster (IC). 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 Key Programming Using Diagnostic Equipment. CYCLE the ignition. REPEAT the self-test. TEST the system for normal operation.

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. TEST the system for normal operation.

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