ABS cable disconnection

Tiny
PHILIP GAO
  • MEMBER
  • 2012 RAM 1500
  • 5.7L
  • V8
  • 4WD
  • AUTOMATIC
  • 260,000 MILES
Require a ABS cable diagram for the truck listed above.

My truck has a "Four wheels service" warning, and a ABS waning in the same time.
use a ODBII scan the code related this part:
C1020 Left Wheel Speed Sensor Circuit
C102A Left Rear Wheel Speed Comparative Performance
U0415 Implausible Data Received from ABS
U417 Implausible Left Wheel Distance Signal Received
I removed the previous ABS speed Sensor, and change a new one there, but problem is still there. I measured the cable when the start key switch to on, the right rear side ABS cable has a 12v voltage between the green/white cable, but nothing in the left rear side cable terminal, the white cable in the left side has hundreds ohm to ground body, but the green cable no voltage with the ground.
I check the cable interface, it looks this car has repaired this part before, the cable is fixed specially,
Hope know this green cable connect to where?
The ABS module or ECU module?
In which number interface?
It's not easy to find the break point, but it maybe offer a signal cable is maybe easy.
Thank you for any suggestion!
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Saturday, March 20th, 2021 AT 4:02 PM

15 Replies

Tiny
JACOBANDNICKOLAS
  • EXPERT
Hi,

The green wires go to the ABS module. I have attached the entire wiring schematic below. I had to cut it in half to make it readable. I did overlap the two so you can follow them easier.

Here is a link you may find helpful:

https://www.2carpros.com/articles/how-to-check-wiring

Also, here is a link that shows how to test a wheel speed sensor:

https://www.2carpros.com/articles/abs-wheel-speed-sensor-test

I hope this helps. Let me know what you find or if you have other questions.

Take care,

Joe
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Sunday, March 21st, 2021 AT 7:38 PM
Tiny
PHILIP GAO
  • MEMBER
Hi, Joe,

Thank you so much so fully information, excuse me I didn't reply you quickly. 2012 Ram 1500 is a little different than your car, I take some pictures for reply your post, I found a 2011 Ram 1500 is the correct diagram in this address:
https://f01.justanswer.com/exptech2015/36b4c5a7-1ad2-4bd7-805f-937f07b30ef8_ram_1.jpg
and I take two images for the ABS module interface, it's this year car cabling terminal:
The red female terminal come with 12V in Pin 2, so Pin 41 should be the Left Rear positive cable, but can't measure the voltage when the terminal opening.
what I can do is following choice:

1) Use a new cable replace all this part cable, this need open the red terminal for a pair new cable about 3M long.
2) Use a cable tracker device to find where is the previous cable break point, they all one day job.
Hope I can finish it.
May Jesus keep your heart in the days before He comes :)
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Tuesday, March 23rd, 2021 AT 3:47 PM
Tiny
JACOBANDNICKOLAS
  • EXPERT
Hi,

If there is an open circuit, I would suggest replacing the cable. Also, I attached the wiring schematic from the manufacturer below. Take a look through it and let me know if it helps.

Take care,

Joe

See pics below.
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Tuesday, March 23rd, 2021 AT 6:09 PM
Tiny
PHILIP GAO
  • MEMBER
Hi, Joe,

Thank you more detail diagrams. I got my cable track tool and wait a warm day, my garage is too small to the truck, I have to keep the garage door opening when I repair the truck, but Toronto is always cold recently.
The cable tracking tool is useless, I have to use a multimeter to detect cable again, this a new result:
Both the dark green to interface 42
and the yellow to interface 41
are not break, they are good to the ABS module interface, no short between the cable.
But this dark green cable can't be found a 12V voltage, but the right rear cable can be measured a 12V voltage when the key turn on.
According to this part diagram, the male interface can't be measure the voltage when the terminal opened. The power input in the female side, only when the terminal connection, the power cable connected.
After this found, I use the ODBII monitor the four speed sensors again, it's the same result, only the left rear one no reading. Because it can't be measure the 12V when the key turn on, and the cable problem only inside the ABS module.
So, that's a lot of money and some risk to change the ABS module, Is there other possible, or how I can detect the ABS module problem? This part looks not easy to open repair.
Thank you!
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Monday, April 5th, 2021 AT 10:24 PM
Tiny
PHILIP GAO
  • MEMBER
A little update: previous I said the positive in #41 interface, it should #42 interface.
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Tuesday, April 6th, 2021 AT 5:41 AM
Tiny
JACOBANDNICKOLAS
  • EXPERT
Hi,

No problem. Have you been able to make any more progress?

Joe
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Tuesday, April 6th, 2021 AT 6:32 PM
Tiny
PHILIP GAO
  • MEMBER
Hi Joe,

I watch some video in YouTube, they open the ABS module and rebuild the circuit tiny cable, that's be possible some cable broke inside the ABS module, because the 12V voltage through the ABS Module without the fuse. Maybe this is the reason the cable broke inside the Module?

I viewed some ABS Module images and video, the more easy way is to buy a used Module, disassembly the circle side and replace my one, if this is possible, I don't need to touch the brake oil tube and valve.
Hope I can finish it and share the details to you. :)
Be in Peace.
Thank you!
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Tuesday, April 6th, 2021 AT 6:44 PM
Tiny
JACOBANDNICKOLAS
  • EXPERT
Hi,

That is very possible. Have you checked your module yet? If so, did you find an open circuit?

Anything is possible. I had an A8 that had a faulty ignition column. Audi wanted $3,000.00 to replace it with a new one. I got a used one for 40.00, but the problem was, they can't be reprogrammed after the initial programming. So, I cut and soldered and it worked perfectly. However, it was a nightmare, but the customer was extremely happy. LOL

Let me know what you find. I'm really interested in knowing.

Joe
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Tuesday, April 6th, 2021 AT 7:02 PM
Tiny
PHILIP GAO
  • MEMBER
Hi,

It looks really excited when you finish the task. :)
I order a used module from eBay, with same part number.
But first task is remove 3 broke bolts from engine, the popular Exhaust Manifold problem
Try to find some better tool to match the challenge.

Take care and be in Blessed from The most High,
Philip
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Wednesday, April 7th, 2021 AT 1:34 PM
Tiny
JACOBANDNICKOLAS
  • EXPERT
Hi,

Let me know how things work out for you when you install the new module.

Take care,

Joe
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Wednesday, April 7th, 2021 AT 7:26 PM
Tiny
PHILIP GAO
  • MEMBER
Sorry, it pack for half year because I can't remove the broken bolts in Exhaust Manifold, if someone can suggestion experience mechanic in this area of Toronto, please let me know.

I had to install the Exhaust Manifold back in a little leak situation. It's better than it was.
This time new ABS model replace directly as a comparison, another module coming, I can't find my record now, but it means:
1) the ABS Module should be initiated
2) all the four wheel speed sensor can be found, but the new replaced one in the Left Rear, the data is not same with the other three sensors, this make the brake pedal shocking in every time normal brake,
This looks the ABS module is good, but really require a initiated, this part should include two parts, the ABS module communicate with ECU correct; and the four wheel speed sensor should correct in same data.
I have two option:
1) use the new ABS module, but have to found a device to initiate the ABS module, it take some time to research and buy a new device maybe
2) repair the old ABS module, only need to correct the new Speed sensor sync with other 3 sensors

The better way to check the circuit is remove the abs electrical cover and keep it connect to cable, let the key to turn on, this moment can measure each input pair voltage, it looks the left rear still a little problem, not sure the cable is a little shorting
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Friday, August 13th, 2021 AT 2:51 PM
Tiny
JACOBANDNICKOLAS
  • EXPERT
Hi,

I'm sorry, but I don't know if anyone where you are located. I'm near Pittsburgh, PA (USA). As far as the wiring, if you are concerned there is a short, check it first to see if there is power to it with everything off. Also, check for continuity to ground.

If you look below, it explains how to replace the ABS module. It requires a scan tool that can communicate with the module to initialize it.

Let me know.

Joe
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Friday, August 13th, 2021 AT 7:10 PM
Tiny
PHILIP GAO
  • MEMBER
After more than one year, the problem gone!
Conclusion:
1) ABS module lost one resistor
2) ABS sensor broken in the left rear (maybe I broke it when disassembly)
3) The left rear parking brake assembly is almost left nothing, because the salted road in all the winter, It only 4 fixed bolts left, replaced new brake base, finally it works when the speed sensor tone ring changed. This old ring got some teeth breaking when the packing brake was destroyed.
It's really a big project, a general mechanic should change my ABS control model, the two-packing brake assembly, ABS speed sensor, speed tone ring, that's a lot of job and trying :)
Put the pictures:
1)the original OBD error code:

2)the wrong OBD speed status log:

3)the correct OBD speed log:

4)the lost resistor in ABS controller: without this resistor, there is no voltage in the left rear ABS cable

5)the old speed tone ring: only a little breaking in teeth, changing this one is not difficult as I thought, only a hammer is OK, but it requires remove the rear axle, this should open the rear differential. I made a mistake in first time, few gears fall down from the rear differential, should lock it immediately after remove the locking ring.
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Tuesday, July 19th, 2022 AT 2:36 PM
Tiny
PHILIP GAO
  • MEMBER
Thank you, Joe, hope you do everything well, always in peace. :)
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Tuesday, July 19th, 2022 AT 2:38 PM
Tiny
JACOBANDNICKOLAS
  • EXPERT
Hi,

You are very welcome and thank you for the update.

I'm glad to hear you found the problems. I didn't realize there would be multiple.

Regardless, you take good care of yourself. Please feel free to come back anytime in the future if you have questions. You are always welcome here.

Take care,

Joe
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Tuesday, July 19th, 2022 AT 7:30 PM

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