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Hello ABS experts,
I had an ABS light on my '98 V70 T5 for a long time that I finally realized, according to all the community knowledge was simply the module. I felt I didn't have the time to pull and repair the module, so ordered a rebuilt unit from FCP. I had it installed at the corner garage - good guys that always deal with the car. Afterward the ABS light went off for about 10 minutes, then returned. I didn't know what it was, but suspected a bad rebuilt module, and on the advice of the corner garage, took it to a dealer for diagnosis. My corner garage felt that the more sophisticated diagnostic computer may be helpful.
So I did. The invoice from the dealer, other than "$128.82", says "ABS-314 Faulty ABS control module"
With this diagnosis in hand, I had the parts guys send me another module. This second module was installed today, and the same thing has happened - the light went off for just a few moments, then returned.
I called the dealer, and asked if there was any sort of a reset procedure that they could do, that maybe the guys on the corner didn't know about. The service writer suggested it might be possible, but I would have to pay for another scan.
My questions:
Is there any kind of reset procedure, and if so, can I do it? can the corner guys do it? Does it require the mighty brainpower of a computer from Gothenburg? If the dealer guys can do it, why would they have told me I needed yet another module, their brand new one at a cost of $900 plus labour, rather than trying the reset procedure (I am sure I can guess that answer)
Anyhow, wise Volvo friends, what's the solution here?
Thanks in advance, Ritchard
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Unless I'm mistaken isn't ABS 314 faulty right rear wheel sensor, not ABS control module?
I believe this can either be full on fault or intermittent.
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#1, service writers are not mechanics. You corner shop doesn't sound much better than a service writer with a wrench.
#2, all ABS codes are available with generic scanners. Not all codes are for a bad module, you could have a bad sensor or 4. You could have a bad wire connection. Stop at the local autoparts store and read all of the codes. The scanner plugs into the armrest, just lift the cover.
#3, did you get the correct ABS module for 1998?
#5, why didn't you send your original to Vic to have it re-soldered?
Klaus
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Why are Volvos so endearing? Its just a car.
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Well, I like my guys, they tried everything, replacing sensors and whatnot based on the data they could read.
I may try stopping by the NAPA and borrowing their scanner.
I am pretty sure I got the correct module.
I didn't go the Vic route, because I am just too busy these days to be clonking around under the hood. When I did try, the module was resisting removal and I was busting up my knuckles. I have come to the point where I don't wrench my own car near as much anymore. I'll do the motorcycles, but not the cars. Ordering up a rebuilt module was just easier than getting this one removed, shipped, then going back to the garage for reinstall etc.
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Below is some ABS troubleshooting info from Vic Rocha (posted here with his permission).
In my case, the problem was a broken(due to corrosion) ABS sensor wire, where it plugs into the wheel hub (I soldered it back together). I was able to find this fault thanks to the info on his webpage: http://home.earthlink.net/~vicrocha/Troubleshooting/abs_troubleshooting.htm
Ok, here is the info Vic emailed to me:
"There has been a few common problems associated with non functioning ABS units after they are re-installed.
First, make sure all the ABS fuses are in place and are not burnt. I saw a car once with one fuse removed. Check all the other fuses as well, not just the ABS fuses.
Second, the most common problem that has been reported is a difficulty re-engaging the large connector to the ABS controller properly. This has caused the problem you are experiencing several times.
I receive an e-mail like yours about twice a month and in every case, a fuse was not re-installed or the connector was not re-installed correctly.
Please remove and inspect the condition of the contacts in the large connector, do the same with the two wire connector.
Make sure the connectors fully engage properly. I still have problems myself installing the large connector. YOU SHOULD NOT BE ABLE TO MOVE OR PULL THE LARGE CONNECTOR AWAY FROM THE ABS UNIT. If the connector can be moved or removed from the ABS unit without releasing the black lever, then the large connector is not installed properly.
Also, you may want to clean the connectors with electrical contact or electronic component cleaner to make sure the problem is not a poor connection between the connector and the ABS unit.
Multiple problems are not common; however, they do occur. These are some problems that have been discovered in the past that has caused the ABS to malfunction:
Broken wheel speed sensor wires and/or wiring damaged by previous work. This is becoming a very common problem, these are the troubleshooting instructions to test the wiring. http://home.earthlink.net/~vicrocha/Troubleshooting/abs_troubleshooting.htm
Loose or missing axle nut. This will cause the sensor ring, that it's installed on the axle, to wobble and create an incorrect wheel speed reference.
Broken or missing wheel sensor ring.
Defective ignition switch. This is more common problem in 96-98 Volvos; however, we start to see it more often in newer years. When the ABS light is ON, wiggle the ignition key and see if that has any effect on the ABS light. Turn the ignition switch slightly towards the start position and also towards the OFF position and see if that has an effect on the ABS light.
In the year 1996 Volvo 850 model, there are two other issues that can cause the ABS system to malfunction.
#1 is a defective wiring under a relay, this problem was repaired on most of the cars under a recall. If yours was not repaired, you can still get it repaired under the same recall at no cost to you.
#2 A defective ignition switch. When the ABS light is ON wiggle the ignition key and see if that has any effect on the ABS light. Turn the ignition switch slightly towards the start position and also towards the OFF position and see if that has an effect on the ABS light.
Drive the car again to perform the self test."
Hope this helps you and/or others.
--
'97 850 n/a Wagon, 170K mi ... '98 V70R AWD 115K mi
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Volvocrazed,
Thanks for this response (nearly two months late). The problem continues to plague me, having installed the second rebuilt module that tests at the dealer as faulty. Statistically, two bad modules in a row is pretty hard to fathom, so I am going to have to look at other issues. I briefly entertained the notion that I somehow ordered the wrong module, that I might have traction control - some cdn cars apparently had it without the telltale dash switch. That has proven not to be the case, and I have ordered the correct module - twice.
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