2010 Ford Edge C1155 Hard Code Diag Issues

Jeff Owner/Technician Salmon, Idaho Posted   Latest   Edited  
Question
Braking
2010 Ford Edge SE 3.5L (C) 6-spd (6F50)
C1155

followed diag for C1155 per alldata, code sent me to chart c - per chart results replaced the sensor with NAPA part, all worked well at first, customer came back with saying that the abs light was intermittently on. Checked codes, just c1155 - inspected and found where I had missed some corrosion in the harness side connector at the sensor plug. Replaced with new connector/pigtail, the code is a hard code, will not reset - measured continuity through the wires to the sensor and back at the module connector - 500ohm, tested the other 3 wss and found them all at or about 630 ohm. removed the right side wws sensor and tested it at the left side - code resets, plugged the new left side sensor into the right side - the right side code is a hard code, got a new sensor from ford and have the same problem, what am I missing?

+1
Robert Technician
Hampton, New Jersey
Robert Default
 

I suggest that you load test the wires with a head lamp bulb from the sensor to the abs unit. Ohm test is only good to see if the is an open in my opinion.

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Chris Technical Support Specialist
Commack, New York
Chris Default
   

This vehicle utilizes active wheel speed sensors and they should not be ohm checked as it may damage the diode in the sensor. The signal can be scope monitored and should be a mA square wave from 7mA to 14mA. With sensor unplugged THEN key turned on you should see 12V (use DVOM not a test light) across the WSS connector (power from the ABS module). If concern continues and you can not…

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Helpful
Jeff Owner/Technician
Salmon, Idaho
Jeff Default
 

I have swapped the left and right, when swapped there is no code moves to the right side(c1145) installing brand new ford part I still have a problem, 2 napa parts and the ford part fail and the failure follows the sensor. Is it possible that this is a aplit year and I should be buying a sensor for a 09 or 11. Here is the vin 2FMDK4AC3ABA74763 Only other thought I have is that maybe there is a…

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Chris Technical Support Specialist
Commack, New York
Chris Default
 

Swap the left and right wheel speed sensor wires at the ABS module connector (2 pins for each side), not swap the sensors. retest with the pins swapped so the Left sensor reads as the right and the right sensor reads as the left. If the wiring or sensor is faulty, the fault will move to the other side. If the module is at fault it will stay in the same location. This should go without saying…

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Tyler Technician
Olathe, Kansas
Tyler Resolution
 

So the C1155 became a hard fault after pigtail replacement, correct? Are you confident you got the pin locations correct on the new pigtail? Like Chris said, these are active sensors, and polarity matters.

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Jeff Owner/Technician
Salmon, Idaho
Jeff Default
 

I was very confident that I got the pins correct, but since you asked I checked and found that even though I specifically looked to be sure I did it right, I did not. Swapped the wires at the new plug and all is well. Thanks for your help.

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Albin Diagnostician
Leavenworth, Washington
Albin Default
 

Thanks for the fix Jeff. 6 or 7 years ago I got a Ford Taurus in from a body shop. The body harness had been replaced, and as best I remember, that same DTC was stored for the right rear WSS. I finally found the problem at the harness plug at the ABS controller. The wires on pin 1 & 2 were swapped in the plug. One were was pink, the other red and the wires were installed wrong from the…

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Tyler Technician
Olathe, Kansas
Tyler Default
 

Great to hear, sir. I was somewhat worried that the reverse polarity might damage the replacement sensor(s). But obviously it survived!

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Geoff Diagnostician
Lahaina, Hawaii
Geoff Default
 

Great! Don't forget to amend your original post as "solved"

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