Can program but not communicate

Charles Owner/Technician Turlock, California Posted   Latest  
2006 Ford Freestyle Limited 3.0L (1) (CFT30)
No Communication

Hi guys, I have this auction Freestyle from a dealer, It has been to several other shops, it had no communication with PCM, all other modules communicate. 

I checked all my powers, grounds and communication pins at the PCM, every thing tests good so I condemned the PCM.

Customer supplied a used PCM, I programmed it with the IDS using blank module programming with no problem, when it completes and trys to id the vehicle it will no longer communicate.

I can go back and program it over and over with no problem with the old PCM or the replacement with no problems or errors but I cant communicate with it after. Not sure what I'm missing

Michael Mobile Technician
Clinton, Utah
Michael Default

Hi Charles, Try communicating with an aftermarket tool. First try vehicle specific then OBDII Generic. It may be a problem with your VCMII. -Mike

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Matt Technical Support Specialist
Dallas, Texas
Matt Default

I had a fleet that their inline DLC GPS units would do this. It through me for a loop at first, but all I had to do was unplug it.

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Dean Owner
Albany, New York
Dean Default

That might be a DLC pin fit issue. Try another scan tool.

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Mark Technical Support Specialist
El Cajon, California
Mark Default

Chuck, Does the vehicle run? If not I have experienced this situation with other Fords when the FEPS line is shorted to power. When this happens the PCM will go into a no communication mode but will be programmable. Pin 44 at the PCM/ pin 13 at the DLC should have no voltage present unless programming.

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Chris Technical Support Specialist
Commack, New York
Chris Default

I'm not sure how VREF output acts during programming, but if the module is powering up properly even with no comms, you should see a Vref at any easy to reach Vref sensor (TP, IAT, ect.)

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Charles Owner/Technician
Turlock, California
Charles Update

No vehicle specific communication, only communication is with a snap on OBD2 IOS15765-4(CAN) with very little and incorrect data, no codes. I have not found anything in tapped or plugged in to the DLC or communication lines. I have no voltage on pin 13 of the DLC. Good to hear from you Mark, bought … last year but still have Advanced Diagnostics MDG. 5V reference is good after

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Chris Technical Support Specialist
Commack, New York
Chris Default

5V Vref is good, that means that the PCM should be in a powered up state, Do you still have the ids?? Have you run the network test to evaluate for networking faults on the bus?? Might not be a bad idea to scope the HS can and just make sure the patterns are not corrupted. Have you checked the terminating resistance?

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Nicholas Diagnostician
Brooklyn, New York
Nicholas Default

Hi, not sure if this would help since you already tested power supply. When checking powers and grounds did you load test each circuit?

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Jaime Diagnostician
Ocala, Florida
Jaime Default

Chuck, what does the odometer show?

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