[alsmondeo]

Hi Master-of-none

Thanks for your reply, I'll try out your suggestions. It's not so cold outside now so it makes it a bit easier to work under the car.

It looks like the connections go directly to the abs pump. I did try getting to the connector on the abs pump but access was very restricted and I didn't want to disturb it unnecessarily.

Alan

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[alsmondeo]

If you unplug the sensor do you still get 255km/hr? or pull the sensor out but plugged in* -if so it's not the hub.
When you checked the voltages, for each side did you get "some volts" on one wire and little/none on the other? Maybe the return is shorted.

Ok so I have done some further investigation.
Pulled off connector and still got 255 km/h.
Right Rear Wheel: +ve side 9.7-9.9V / -ve side 0.0-0.2V
Left Rear Wheel: + side 10.4-10.8V / -ve side 0.0-0.2V
If I bridge the +ve/-ve wires with a voltmeter I get approx. 10.8V for both rear wheels – this is what I did last week.

But if I do the same test on the connector under the car (C44-BC) for the RR wheel I get approx. 11V on +ve side (white wire) and 0.0-0.2V on -ve side.

So I guess there must be a problem with the wire from connector (C44) to ABS sensor. No obvious signs of breakages or wear in fact the wiring looks to be in very good condition. A genuine replacement is £29 on eBay so I'm thinking of just swapping it over and hope that solves the problem.

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[alsmondeo]

You could confirm a faulty lead by checking the resistance of each wire, C44 to the sensor
Good luck, hopefully that's a cure.

Well, I bought a new lead from C44 to the sensor and it made no difference. Still get DTC C1A93:14-8A and I can't clear it. Voltage on +ve/-ve wires are same as LH rear wheel.
I think I will have to go to Ford and see if they can clear or find the fault.

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[alsmondeo]

Pop your forscan actual fault log up with freeze frame + dtc codes.... The faults you posted dont make sense. You said lights on for cruise control, collision, abs and t/c... You scanned using forscan and no codes relating to these faults, they don't just disappear themselves and are required to disable modules and activate dash lights.... Your excessive 255speed on 1 wheel sensor would activate abs/tc on that wheel, and log dtcs in various modules and mist likely activate LOS

Hi, thanks for your comments. I haven't been able to re-scan but have included a few screenshots of what I was getting a couple of weeks ago. View attachment 260654 View attachment 260655

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[alsmondeo]

Thanks Antman, but if you look back in my post I have already checked the wiring back to the abs sensor and all looks good. I even changed the wiring, just to be sure and the abs sensor.

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[alsmondeo]

You could confirm a faulty lead by checking the resistance of each wire, C44 to the sensor
Good luck, hopefully that's a cure.

I had almost given up with this ABS issue and was going to take my car to Ford, but they couldn't book me in until 25 April, so I decided to dig deeper myself.
Finally traced the fault to the +ve wire between front bulkhead connector and C44 connector at the rear of the car. When trying to remove C44 connector I noticed the 2 wires going into it were badly kinked and trapped between connector and car body. When I got the connector free I noticed a break in the insulation. I stripped back the insulation and the wire was black, very brittle and there were only a few strands still intact.
As a precaution I replaced last 4-5 inches of +ve and - ve wires and re-routed wiring to avoid kinking and rubbing on car body.
DTC codes cleared and everything back to normal (ABS, TC, cruise control, collision warning and hill start all up and running again).

Thanks to everyone who offered help and advice.

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