ABS TRACS lights coming on intermittently

[Luxobarge]

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.

[El Padrino]

Originally Posted by Luxobarge

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.

Hi Luxobarge, I'm not sure if I was clear as to which wiring plug I meant in my previous post, to spray with contact cleaner. In the first photo (ABS module socket), I've always been cleaning this one, but I was referring to the multi-coloured wire connector (red arrow in the second photo). Can I spray contact cleaner into this one ie the connecting block?

[Luxobarge]

Originally Posted by El Padrino

Can I spray contact cleaner into this one ie the connecting block?

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.

[El Padrino]

Originally Posted by Luxobarge

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.

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.

[El Padrino]

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.

[Bob Meadows]

Edit- no message

[El Padrino]

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.

[richmac]

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.

[El Padrino]

Originally Posted by richmac

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.

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.