940 Celebration Estate ABS light - Page 2

CTCNetwork · Jul 5th, 2009, 12:34

Hi,

Yes, as above, you do not have the diagnostic boxes in the engine compartment. You will see the ABS unit in there but that has no means of diagnosis.

Build yourself one of those code readers (at some point) and connect to the OBDII port in the arm rest storage as described.
In the mean time a dealer or good independent will be able to read the codes for you (maybe for a charge!)..

I'm sure I must have a photo of the connection somewhere...

Des. . .

classicracing · Jul 5th, 2009, 13:45

You're all making the same mistakes the Volvo Master Techs used to. Stop and think what will have changed to cause this problem in such a short time. By all means read the codes if you have a reader but it will say ABS signal fault. Wow how helpful is that!!!!
I know I'm a synical old git but lets go back to basics and check a few simple things first before you start changing the ABS module.
The sensors on each wheel 'look' at a serrated wheel on the back of the hub. If all the signals are equal the system functions. If one is different the ABS malfunctions or the system warning light is put on.
A spider can make a nest or web on the sensor and the sensor can no longer 'see'
So first I would simply look at each sensor, check it is correctly located in its bracket ( as the air gap between sensor and wheel is critical) clean it of dust and debris and move to the next etc....
Then I would check the multi plugs connecting the system and pull them apart check for dirt and refit ( use elec contact spray to clean if you need to)
In 9 out of 10 cases the fault will be fixed without a lot of head scratching and component buying
The above simple approach uses logic and common sense, don't make the classic mistake of getting fooled by diagnostics
This approach works for most other problems too. Sit , think about what's changed and don't get too technical
Regards to All from an Old School Git
Richard

Profpriv · Jul 5th, 2009, 15:37

Hi Richard

Thanks for the common sense approach.As a heating engineer I use exactly that approach ,but didnt carry it across to the Volvo.

Ill try the wheel sensors first, then illl come back and ask for more help.

Ive found where the diagnostic box connects so thats a step fr later on.

Thanks

Shaun(profpriv)

Profpriv · Jul 10th, 2009, 19:18

Hi again Richard

Benn thinking about your post this week,and your advice to sit and think about whats changed.

Whats changed is that one day the ABS light wasnt on, and the next day it was.The bity is the simple bit.

The hard part is finding out why.

RealEstate · Jul 10th, 2009, 22:49

If your still stuck, I suggest you take your car to RT Mechanics who are now in Haslemere (not a million miles from Burgess Hill), who advertise on this site. You will get A1 service at an affordable price. If you ask nicely, they may even give you guidance over the phone.
They've helped me several times over the phone, but then I am one of their customers!
All the best,
Ben

boxman · Jul 11th, 2009, 17:34

Quote:

Originally Posted by Profpriv

Hi again Richard

Benn thinking about your post this week,and your advice to sit and think about whats changed.

Whats changed is that one day the ABS light wasnt on, and the next day it was.The bity is the simple bit.

The hard part is finding out why.

This is why you really need to find the codes and act on them - the "logical" approach is fine initially but you can waste so much time and effort trying to eliminate all possibilities and it ends up money well spent getting the info from where it is stored in the ECU..

Best of luck
John

Profpriv · Jul 13th, 2009, 21:43

Is there a way of testing the road wheel sensors??

Can I test for a resistance of some sort with a multimeter?

Jul 5th, 2009, 12:34	#11
CTCNetwork Forum Support Team Join Date: Dec 2004 Location: Liège, Belgium View Photos By: CTCNetwork	Hi, Yes, as above, you do not have the diagnostic boxes in the engine compartment. You will see the ABS unit in there but that has no means of diagnosis. Build yourself one of those code readers (at some point) and connect to the OBDII port in the arm rest storage as described. In the mean time a dealer or good independent will be able to read the codes for you (maybe for a charge!).. I'm sure I must have a photo of the connection somewhere... Des. . . __________________ Density:- Not just a measurement ~ It's a whole way of Life.! ! ! I drive a Volvo, Please Don't Get In My Way! OldVolvos4Ever He shows up. People die. He vanishes. People should not be afraid of their governments. "He'll deliver more justice in a weekend than 10 years of your Governments should be afraid of their people... "V" courts & tribunals. Just stay out of his way." "I plan to."

Jul 5th, 2009, 13:45	#12
classicracing Senior Member Last Online: Jul 26th, 2010 09:55 Join Date: Dec 2003 Location: Taunton, Somerset	You're all making the same mistakes the Volvo Master Techs used to. Stop and think what will have changed to cause this problem in such a short time. By all means read the codes if you have a reader but it will say ABS signal fault. Wow how helpful is that!!!! I know I'm a synical old git but lets go back to basics and check a few simple things first before you start changing the ABS module. The sensors on each wheel 'look' at a serrated wheel on the back of the hub. If all the signals are equal the system functions. If one is different the ABS malfunctions or the system warning light is put on. A spider can make a nest or web on the sensor and the sensor can no longer 'see' So first I would simply look at each sensor, check it is correctly located in its bracket ( as the air gap between sensor and wheel is critical) clean it of dust and debris and move to the next etc.... Then I would check the multi plugs connecting the system and pull them apart check for dirt and refit ( use elec contact spray to clean if you need to) In 9 out of 10 cases the fault will be fixed without a lot of head scratching and component buying The above simple approach uses logic and common sense, don't make the classic mistake of getting fooled by diagnostics This approach works for most other problems too. Sit , think about what's changed and don't get too technical Regards to All from an Old School Git Richard __________________ 24 years of Volvo ownership 940 Sport 940 GLE HPT

Jul 10th, 2009, 22:49	#15
RealEstate Master Member Last Online: Nov 4th, 2018 16:06 Join Date: Dec 2003 Location: Berkshire & N Wales View Photos By: RealEstate	RT Mechanics If your still stuck, I suggest you take your car to RT Mechanics who are now in Haslemere (not a million miles from Burgess Hill), who advertise on this site. You will get A1 service at an affordable price. If you ask nicely, they may even give you guidance over the phone. They've helped me several times over the phone, but then I am one of their customers! All the best, Ben Last edited by RealEstate; Jul 10th, 2009 at 22:57.

Jul 5th, 2009, 15:37	#13
Profpriv I've Been Banned Last Online: Jun 15th, 2015 21:48 Join Date: May 2009 Location: BURGESS HILL	Hi Richard Thanks for the common sense approach.As a heating engineer I use exactly that approach ,but didnt carry it across to the Volvo. Ill try the wheel sensors first, then illl come back and ask for more help. Ive found where the diagnostic box connects so thats a step fr later on. Thanks Shaun(profpriv)

Jul 10th, 2009, 19:18	#14
Profpriv I've Been Banned Last Online: Jun 15th, 2015 21:48 Join Date: May 2009 Location: BURGESS HILL	Hi again Richard Benn thinking about your post this week,and your advice to sit and think about whats changed. Whats changed is that one day the ABS light wasnt on, and the next day it was.The bity is the simple bit. The hard part is finding out why.

Jul 13th, 2009, 21:43	#17
Profpriv I've Been Banned Last Online: Jun 15th, 2015 21:48 Join Date: May 2009 Location: BURGESS HILL	Is there a way of testing the road wheel sensors?? Can I test for a resistance of some sort with a multimeter?

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