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850 / S70 & V70 '96-'99 / C70 '97-'05 General Forum for the 850 and P80-platform 70-series models |
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ABS TRACS lights coming on intermittentlyViews : 2907 Replies : 39Users Viewing This Thread : |
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Mar 13th, 2024, 11:26 | #31 |
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The plug would originally have had a big black plastic cover over the wiring and a metal lever that engages on the socket and pulls the plug tight down when it's flipped over. However yours are missing. Mine is the same, the lever assembly broke and departed some time ago, but so long as the socket is firmly plugged in all the way and held with a cable tie as you have done it should be fine.
Yes, it's fine to spray all the plug pins in contact cleaner, although I doubt this is the problem. While you're in there it's worth making sure that all the individual contacts in the plug are in the correct position and have not "sunk" down into the plug body. If this were the case then it's likely the "sunk" one(s) would be making bad contact, but a thorough visual inspection under a bright light will confirm one way or the other.
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Mar 13th, 2024, 15:16 | #32 | |
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Mar 13th, 2024, 16:09 | #33 |
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The answer's still yes, you can spray pretty much any connector with contact cleaner, but I doubt it will have any effect on your fault.
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Mar 13th, 2024, 19:57 | #34 |
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Thanks for clarifying that Luxobarge. Yes, I still need to resolder the joints/pins, so removed the ABS module again after work this evening ready for it.
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Mar 17th, 2024, 13:52 | #35 |
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I refreshed the following solder joints I did recently. No way is my soldering as neat as this.
ABS solder joint pins.JPG And then tested the following pins on the module socket with a multimeter, as per the instructions on this link - https://midwest-abs.com/troubleshooting ABS module socket.JPG LF sensor: pins 11 & 4 RF sensor: pins 18 & 3 LR sensor: pins 10 & 2 RR sensor: pins 17 & 1 I got a 'I' reading each time on the multimeter on the pins, when the multimeter is set to the 20K ohms setting. My soldering can't be good enough or I'm not using the correct soldering tip. The tip I'm using seems appropriate for the size of soldering I'm doing, so it must be my soldering I don't think I've damaged the PCB. So, it continues. |
Mar 18th, 2024, 10:20 | #36 |
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Mar 21st, 2024, 20:55 | #37 |
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So, I removed the old soldering I did on the appropriate pins and resoldered with fresh solder. Looks a bit better than before and learning to solder as I go along.
I took some readings on the module itself on the speed sensor pins. My multimeter was set to 2000k on the ohms setting this time. I wasn't getting any reading when it was set to 20K (on the ohm setting again) and guess it is out of range. I hope that is correct. I got the following readings: LF sensor: pins 11 & 4 = 142.5 RF sensor: pins 18 & 3 = no reading at all (need to resolder these pins) LR sensor: pins 10 & 2 = 80.6 RR sensor: pins 17 & 1 = 80.5 Do I multiply these readings by one thousand to get the proper results? I'm only learning to use a multimeter as I go along and not sure how to interpret the readings. Can someone with more knowledge tell me if the values are what they should be please? I read somewhere the sensors should read between 800 - 1300 ohms. Many thanks in advance. |
Mar 21st, 2024, 21:54 | #38 |
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Hi,
If these readings were taken with it plugged in on the car as intended, you've found the problem - wiring to the RF sensor. Best regards, Rich. |
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Mar 21st, 2024, 22:21 | #39 |
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Hi richmac, I should have said that the ABS module wasn't connected to the car and the pins were tested on my work bench. I wanted to make sure I got a reading from the corresponding speed sensor pins on the module first before re-attaching back onto the ABS pump. And make sure the readings I have are correct.
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May 20th, 2024, 12:18 | #40 |
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My ABS/TRACS light issue had to take a back seat since the last update, but have resolved the issue now. I had the old ABS module I was trying to re-solder looked at by a colleague's friend who is a car electrician. They said the module was unrepairable, so I'm thinking I may have damaged it when I accidently knocked it off my work bench and damaged the PCB during my attempts at re-soldering. I managed to source another module of eBay, fitted it, cleared the DTC codes and no longer have the ABS/TRACS lights on.
Glad to have that ticked off. I hope this replacement module lasts until the next MOT by keeping the dreaded lights off. We shall see. Thanks for all the contributions from everyone on this thread. |
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