FREE REPAIR MANUALS & LABOR GUIDES 1982-2013 Vehicles
Courtesy of Operation CHARM: Car repair manuals for everyone.
Home >> Mercury >> 2009 >> Grand Marquis V8-4.6L >> Repair and Diagnosis >> Accessories and Optional Equipment >> Antitheft and Alarm Systems >> Testing and Inspection >> Pinpoint Tests >> Pinpoint Test B: DTC B1600

Pinpoint Test B: DTC B1600




Anti-Theft

Pinpoint Test B: DTC B1600

Normal Operation
- DTC B1600 (PATS Ignition Key Transponder Signal Is Not Received) - sets when no
Passive Anti-Theft System (PATS) key has been read by the PCM.

This pinpoint test is intended to diagnose the following:

- PATS key
- PATS transceiver
- PCM



PINPOINT TEST B: DTC B1600

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 key 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.)

-------------------------------------------------
B1 RETRIEVE THE DTCs


- Ignition ON.
- Clear the DTCs.
- Ignition OFF.
- Ignition ON.
- Retrieve the DTCs.
- Is DTC B1600 retrieved?

Yes
GO to B2.

No
If DTCs other than PATS PCM DTCs are retrieved, REFER to Computers and Control Systems Information.

If no PATS DTCs are retrieved, the system is OK. The concern may have been interference from another object.

-------------------------------------------------
B2 CHECK BOTH PATS KEYS


NOTE: Check to make sure the new PATS keys are approved Ford encoded PATS keys. Unapproved PATS keys do not always operate correctly over various temperature ranges. (PATS keys from Ford, Rotunda, Strattec, or Huf are approved Ford PATS keys.)

- Obtain both PATS keys from the customer and follow the procedure using one PATS key, then the other. If the customer only has one PATS key, it will be necessary to cut a new PATS key.
- If it is necessary to cut a new PATS key, program the new PATS key. Refer to Key Programming Using Diagnostic Equipment Using Diagnostic Equipment.
- Ignition ON.
- Clear the DTCs.
- Ignition OFF.
- Ignition ON.
- Retrieve the DTCs.
- Using either existing key(s) or the new key (if a new one was cut and programmed), is DTC B1600 present?

Yes
If DTC B1600 was present for all keys, GO to B3.

If DTC B1600 was not present for one of the keys, the other key may be damaged and should be replaced. CUT a new key to replace the damaged key. REFER to Key Programming Using Diagnostic Equipment Using Diagnostic Equipment. CLEAR the DTCs. CYCLE the ignition. REPEAT the self-test. TEST the system for normal operation.

No
If DTCs other than PATS PCM DTCs are retrieved, REFER to Computers and Control Systems Information.

If no PATS DTCs are retrieved, the system is OK. The concern may have been caused by interference from another object.

-------------------------------------------------
B3 INSTALL A NEW PATS TRANSCEIVER


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

NOTE: Do not use the new PATS key that may have been programmed in Step B2.

- 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.
- Is DTC B1600 retrieved?

Yes
GO to B4.

No
The system is OK.

-------------------------------------------------
B4 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.

-------------------------------------------------


pro multis Credits:Operation CHARM About Operation CHARM