1995 Volvo 850 Turbo TRAC and ABS light

Post by **misha** » 01 Dec 2017, 05:34

It's time to pm Matty Moo.

Post by **RickHaleParker** » 01 Dec 2017, 06:30

Ok here are the codes I got ...

2-1-3 Left Rear Wheel Sensor, Signal Absent When Moving Off
2-1-4 Right Rear Wheel Sensor, Signal Absent When Moving Off
1-4-1 Faulty Pedal Sensor, Short To Ground Or Voltage
1-4-2 Faulty Brake Light Switch, Open Or Short Circuit

The link below will take you to a ton of information on the 1995 Volvo 850 ABS system.

https://www.volvoclub.org.uk/tech/servi ... ontrol.pdf

Post by **misha** » 01 Dec 2017, 06:49

I doubt that all those malfunctions happened at the same time.The only explanation is in faulty abs module(cold solders) since they are known to go bad without exceptions.
Although abs units up to '95 have minimum chance of failure...they can also go bad.
Pm Matty Moo and see what he have to say about that.

winter4w · Post by **winter4w** » 09 Dec 2017, 19:18

misha wrote: 01 Dec 2017, 05:34 It's time to pm Matty Moo.

Guess ill PM him to this thread

RickHaleParker wrote: 01 Dec 2017, 06:30 Ok here are the codes I got ...

2-1-3 Left Rear Wheel Sensor, Signal Absent When Moving Off
2-1-4 Right Rear Wheel Sensor, Signal Absent When Moving Off
1-4-1 Faulty Pedal Sensor, Short To Ground Or Voltage
1-4-2 Faulty Brake Light Switch, Open Or Short Circuit

The link below will take you to a ton of information on the 1995 Volvo 850 ABS system.

https://www.volvoclub.org.uk/tech/servi ... ontrol.pdf

Yea I was looking at that. Could it be possible it all failed?

misha wrote: 01 Dec 2017, 06:49 I doubt that all those malfunctions happened at the same time.The only explanation is in faulty abs module(cold solders) since they are known to go bad without exceptions.
Although abs units up to '95 have minimum chance of failure...they can also go bad.
Pm Matty Moo and see what he have to say about that.

Yea seeing all those errors made me wonder the same thing. Looking on eBay it looks like the 1995 Modules are cheap. I may just buy one on eBay and put it in and see how it works. Here is one I found (https://www.ebay.com/itm/1993-1995-Volv ... Cb&vxp=mtr)

Post by **misha** » 09 Dec 2017, 19:57

No.
There are two types of those modules....the ones that failed and those that didn't failed YET.
Matty Moo rebuilds them(resolder them) and you're good to go as far as car lasts.

winter4w · Post by **winter4w** » 09 Dec 2017, 20:44

misha wrote: 09 Dec 2017, 19:57 No.
There are two types of those modules....the ones that failed and those that didn't failed YET.
Matty Moo rebuilds them(resolder them) and you're good to go as far as car lasts.

Looking at the website I don't see anything about the 1995 ABS modules only 1996 and up. Also if I did get one off eBay is it plug and play or do they need to be programmed?

Post by **misha** » 10 Dec 2017, 03:54

Your choice.
No need for programing.

Post by **abscate** » 10 Dec 2017, 04:22

There are two types of those modules....the ones that failed and those that didn't failed YET(either one you can buy on eBay,,,)

Post by **RickHaleParker** » 10 Dec 2017, 04:52

Yea I was looking at that. Could it be possible it all failed?

It is possible but highly improbable that 4 sensors failed. The probability that the defect is a common component is high. The ABS control module is common to all four sensors and is known to cause these symptoms.

Comb through the descriptions on eBay. There are vendors that not only remanufacture the ABS control module, they also re-engineer the problem so that it does not come back. There are two different ABS modules. One for cars equipped with TRAC and one for cars not equipped with TRAC, get the right one.

winter4w · Post by **winter4w** » 11 Dec 2017, 16:25

misha wrote: 10 Dec 2017, 03:54 Your choice.
No need for programing.

Ok awesome. Also where would I go to contact Matty Moo?

abscate wrote: 10 Dec 2017, 04:22 There are two types of those modules....the ones that failed and those that didn't failed YET(either one you can buy on eBay,,,)

Yea I know that risk however considering they are $20-$30 not much of a loss. If a replacement one works from eBay I could always still send the original one in for repair and reinstall it while having a spare one in case something does happen later on.

RickHaleParker wrote: 10 Dec 2017, 04:52 Yea I was looking at that. Could it be possible it all failed?

It is possible but highly improbable that 4 sensors failed. The probability that the defect is a common component is high. The ABS control module is common to all four sensors and is known to cause these symptoms.

Comb through the descriptions on eBay. There are vendors that not only remanufacture the ABS control module, they also re-engineer the problem so that it does not come back. There are two different ABS modules. One for cars equipped with TRAC and one for cars not equipped with TRAC, get the right one.

Ok thanks, Do you have any links to sellers with repaired or fixed modules? The 850 we got does have traction control.