Have Ford Questions? Ask a Mechanic for Answers ASAP
Welcome, I'm Chris (aka Moose), my normal schedule online is around lunch and after dinner past midnight.
Are you getting the erratic speed signal in the ABS and PCM when scanned?
Is the transmission shifting poorly?
If you access the PIDS in the ABS and monitor the rear wheel speed sensor on a graph does it to show this inconsistency?
Can you try that and let me know the results?
This vehicle does not have a transmission control module. The PCM controls the 4R100/E4OD transmission.
Is this a light or super duty F250?
What liter engine?
They are all called the PCM. Ford rarely calls its computer modules ECM or ECU like other make vehicles.
Here is a diagram of this circuit. https://dl.dropboxusercontent.com/u/90220402/gybk.pdf
So far the ABS module looks to be to blame here. We need to watch its reading from the rear sensor and its VSS signal it is making when only monitoring the ABS. If the signal is messed up there, then it is the ABS module sending out a bad VSS signal.
Prior to completing the mandatory rating at the top of your screen. Let me know if I have not yet provided you with ~5 STAR EXCELLENT~service. Reply and let me know in more detail what you need to be pleased with my help.
That is correct the ABS makes the VSS signal and sends it out to everything.
When the PCM does not get a VSS signal it tries to get a signal from the OSS. When it notices VSS and OSS differing it stores both codes.
Hello again Chris here,
What codes are stored in the ABS?
Is the ABS showing an accurate reading from the rear axle speed sensor?
I believe your ABS module is bad.
2 hours ago you said you sent the ABS module off to get repaired.
Was it repaired or replaced?
Your ABS module is bad or is not even powering up since your IDS can not get codes from it and the warning light is on.
I suspect the rebuild was not successful.
Blown fuse, damaged wiring or connector, bad grounds. All of these can cause an ABS module to not power up.