ABS control unit repair - Page 13

Grendel · Aug 7th, 2009, 20:14

For me the new sensors did the trick, ABS lights stayed on until 25mph then went out and have stayed out since, ABS certainly works (some people are stupid and step out in front of Volvos).
Total cost £111 for parts, and about 1 hour to fit - the biggest problem, getting the conector through over the top of the fuel tank to the socket.(its a tight fit in there)
Grendel

rich850t5 · Aug 8th, 2009, 21:43

hmmm wonder if this is what has gone on mine, I only just noticed today that the abs and tracs lights do not turn on when the ignition is on so I susspect the previous owner has removed the lamps to hide the fualt, also car is fitted with cruise control which also doesnt seem to work.

other than the ecu fualt what are other common abs/tracs cruise control fualts?

Grendel · Aug 8th, 2009, 22:36

On mine I tested at the ABS ECU Socket, with a multimeter, the pins on the socket are 1 and 17 right rear sensor, 2 and 10 - left rear sensor, 3 and 18 right front sensor, and 4 and 11 for left front sensor, when mine was failing I lost cruise a couple of times, I guess suddenly going slower than the other wheels, tripped the cruise, if you test those circuits you should get a circuit, if not then there is either a faulty sensor or cable to the sensor. if all those are ok check the front sensors are clean as they are out in ther open. the front ones are seperate, the rears come as a pair attatched at the plug.
Grendel

Jod T5 · Aug 9th, 2009, 10:48

Quote:

Originally Posted by Grendel

On mine I tested at the ABS ECU Socket, with a multimeter, the pins on the socket are 1 and 17 right rear sensor, 2 and 10 - left rear sensor, 3 and 18 right front sensor, and 4 and 11 for left front sensor, when mine was failing I lost cruise a couple of times, I guess suddenly going slower than the other wheels, tripped the cruise, if you test those circuits you should get a circuit, if not then there is either a faulty sensor or cable to the sensor. if all those are ok check the front sensors are clean as they are out in ther open. the front ones are seperate, the rears come as a pair attatched at the plug.
Grendel

Hi
How did you test?..For continuity or resistance?...

Cheers
Jod

Grendel · Aug 9th, 2009, 23:43

Just resistance, about 1Kohm from memory, but they are all the same, on mine there was no circuit between 2 and 10, so it was a faulty rear sensor.
grendel

Ozark Lee · Aug 10th, 2009, 00:02

If it helps at all I did a writeup here with some decent pictures of everything.

http://www.matthewsvolvosite.com/for...hp?f=1&t=12651

The site is being migrated to a new server at present so a bit of patience is required.

...Lee

johnmacii · Aug 14th, 2009, 19:13

Do not take this idiots advive the control unit is one peice plastic unit and is not designed to be opened. You will most likely destroy it which is exactly what i did and i am a qualified electronic engineer - same us from the moron with just enough knowledge to f*** up.

JonYorks · Aug 14th, 2009, 22:01

Quote:

Originally Posted by johnmacii

Do not take this idiots advive the control unit is one peice plastic unit and is not designed to be opened. You will most likely destroy it which is exactly what i did and i am a qualified electronic engineer - same us from the moron with just enough knowledge to f*** up.

Hundreds of people have opened up the abs module and resoldered the joints and fixed the problems so your wrong. Yes it is designed not to be opened but thats just to force people to pay out for a new one.

AlanB · Aug 14th, 2009, 23:43

Quote:

Originally Posted by johnmacii

Do not take this idiots advive the control unit is one peice plastic unit and is not designed to be opened. You will most likely destroy it which is exactly what i did and i am a qualified electronic engineer - same us from the moron with just enough knowledge to f*** up.

I resent that; I too am a qualified electronic engineer, and this was an easy fix.
The unit is faulty, there is nothing to loose. Opening is easy, but maybe that requires a few mechanical engineering skills and is probably the longest part of the job. Careful inspection and reference to prior advice soon identifies the problem areas. Simple removal of solder resist and resolder.

I am sorry to hear that you failed, but many have not, and hopefully you are none the worse off for the attempt.

So thanks to everyone for the accumulated advice here.

Rovolver · Aug 15th, 2009, 10:26

Unfortunately I belong to the minority for whom resoldering the joints didn't mean ABS & Tracs lights switched off.But I can't say that I destroyed my control unit.Maybe I just didn't do a very good job as I ain't a pro..
Now I'm looking into other alternatives..

Has anyone tried this company?
http://www.carelect.demon.co.uk/frame.html

If yes,how did it go?

Aug 7th, 2009, 20:14	#121
Grendel Junior Member Last Online: Apr 13th, 2015 20:37 Join Date: Jul 2009 Location: Canterbury	For me the new sensors did the trick, ABS lights stayed on until 25mph then went out and have stayed out since, ABS certainly works (some people are stupid and step out in front of Volvos). Total cost £111 for parts, and about 1 hour to fit - the biggest problem, getting the conector through over the top of the fuel tank to the socket.(its a tight fit in there) Grendel __________________ volvo 850 2.5 Estate 1996

Aug 8th, 2009, 22:36	#123
Grendel Junior Member Last Online: Apr 13th, 2015 20:37 Join Date: Jul 2009 Location: Canterbury	On mine I tested at the ABS ECU Socket, with a multimeter, the pins on the socket are 1 and 17 right rear sensor, 2 and 10 - left rear sensor, 3 and 18 right front sensor, and 4 and 11 for left front sensor, when mine was failing I lost cruise a couple of times, I guess suddenly going slower than the other wheels, tripped the cruise, if you test those circuits you should get a circuit, if not then there is either a faulty sensor or cable to the sensor. if all those are ok check the front sensors are clean as they are out in ther open. the front ones are seperate, the rears come as a pair attatched at the plug. Grendel __________________ volvo 850 2.5 Estate 1996

Aug 9th, 2009, 23:43	#125
Grendel Junior Member Last Online: Apr 13th, 2015 20:37 Join Date: Jul 2009 Location: Canterbury	Just resistance, about 1Kohm from memory, but they are all the same, on mine there was no circuit between 2 and 10, so it was a faulty rear sensor. grendel __________________ volvo 850 2.5 Estate 1996

Aug 10th, 2009, 00:02	#126
Ozark Lee New Member Last Online: Feb 21st, 2015 01:06 Join Date: Feb 2008 Location: USA Midwest	If it helps at all I did a writeup here with some decent pictures of everything. http://www.matthewsvolvosite.com/for...hp?f=1&t=12651 The site is being migrated to a new server at present so a bit of patience is required. ...Lee __________________ 1994 854 N/A 1996 854 Platinum Turbo 1996 854 N/A Previous Volvos: 1989 744 GLT - 1986 744 GLT 1972 142 Grand Luxe

Aug 14th, 2009, 19:13	#127
johnmacii New Member Last Online: Aug 16th, 2009 08:59 Join Date: Aug 2009 Location: edinburgh	bad advice Do not take this idiots advive the control unit is one peice plastic unit and is not designed to be opened. You will most likely destroy it which is exactly what i did and i am a qualified electronic engineer - same us from the moron with just enough knowledge to f*** up.

Aug 8th, 2009, 21:43	#122
rich850t5 New Member Last Online: Jan 14th, 2010 21:00 Join Date: Aug 2009 Location: nottingham	hmmm wonder if this is what has gone on mine, I only just noticed today that the abs and tracs lights do not turn on when the ignition is on so I susspect the previous owner has removed the lamps to hide the fualt, also car is fitted with cruise control which also doesnt seem to work. other than the ecu fualt what are other common abs/tracs cruise control fualts?

Aug 15th, 2009, 10:26	#130
Rovolver New Member Last Online: Jan 24th, 2013 04:07 Join Date: Jul 2009 Location: Surrey	Unfortunately I belong to the minority for whom resoldering the joints didn't mean ABS & Tracs lights switched off.But I can't say that I destroyed my control unit.Maybe I just didn't do a very good job as I ain't a pro.. Now I'm looking into other alternatives.. Has anyone tried this company? http://www.carelect.demon.co.uk/frame.html If yes,how did it go?

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