Ford FEPS

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Ford FEPS

Postby mtech » Sun Feb 18, 2018 6:13 pm

I have a J2534 adapter that does not have anything physically connected to pin 13 on it's circuit board. As a result, I am unable to flash Ford PCMs likely due to a lack of FEPS voltage on pin 13. Does anyone know if I can use an obd breakout box to manually assert 18v on pin13 and have the flash complete successfully? Are there specific timings where FEPS must be started and stopped? Can I just turn it on prior to flash and stop it when flash completes?

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Re: Ford FEPS

Postby Tazzi » Mon Feb 19, 2018 8:25 am

I Just have a switch from the FEPs pin on the ECU to battery power.

Turn it on, connect ECU, begin reading :thumbup:

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Re: Ford FEPS

Postby mtech » Mon Feb 19, 2018 1:30 pm

Does the same hold true for writing? I am using Ford IDS and the software only writes. The first step it does is to erase the PCM. Does the voltage need to be stopped and started between erase and flash? I am afraid that I will be left with a bricked PCM.

What software do you recommend using to read the PCM? I think that would be good to have a full backup. The vehicle is a US F150.

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Re: Ford FEPS

Postby rolls » Wed Apr 11, 2018 3:21 pm

mtech wrote:Does the same hold true for writing? I am using Ford IDS and the software only writes. The first step it does is to erase the PCM. Does the voltage need to be stopped and started between erase and flash? I am afraid that I will be left with a bricked PCM.

What software do you recommend using to read the PCM? I think that would be good to have a full backup. The vehicle is a US F150.


Normally the process is as following:

FEPS 0v
FEPS 18v (as low as 12v appears to still work)
Cycle ignition off
Wait 3 seconds
Cycle ignition on
Perform security unlock within a few seconds
do stuff
FEPS 0v
Power cycle

It needs to see the 0-18v transition and then a power cycle.

Very hard to brick these PCMs. If you do an erase and it fails the write you can simply try again. The erase doesn't erase the RTOS so all the OBD handlers etc are still there. I've tried writing all 0xFF, corrupt data, pulling power mid write etc and I could not brick a PCM even when trying.

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Re: Ford FEPS

Postby mtech » Sun Apr 15, 2018 3:12 pm

Thanks for the info. Do you know of any software I could use to read and backup the current firmware?

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Re: Ford FEPS

Postby rolls » Sun Apr 15, 2018 6:10 pm

You can use the enthusiast version of our software.

www.pcmtec.com

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