c70 abs fault

gnc · Apr 7th, 2019, 10:39

hello. got a 2004 c70 t5 gt, auto. the abs light and traction light is on. its got new interuptor rings, new abs sensors, and ive tried the resolder of the joints in the abs ecu. question is if i take ecu off for checking is the car still drivable minus abs, and the abs fuse is also the immobilizer. also will a ude one go on with out needing programing
thanks geof

SteveSarre · Apr 7th, 2019, 11:08

Hi gnc

In the past, I have forgotten to plug the power cable back in to the abs control module (on a 1998 or 1999 V70).

I got an error code, and a warning light, and of course no ABS, but the car worked fine.

I am pretty sure that completely removing the control module would have the same effect.
While you are at it, get the part number off the module.

If you get a used one (with the same part number) it shouldn't need reprogramming.

Steve

gnc · Apr 7th, 2019, 11:10

thanks, for got to mention it effects the speedo and when cold can stop the gearbox changing up.
geof

SteveSarre · Apr 7th, 2019, 11:16

Thinking about it a bit more, you could unplug the power and the other wire to the abs module, and see what happens.

If that drives ok, then OK to remove the abs module completely for testing etc.

Steve

gnc · Apr 7th, 2019, 11:20

looks like thats what i will have to do.
thanks. geof

SteveSarre · Apr 7th, 2019, 11:43

I am not sure why an abs module would affect the gearbox changing up.

Do you have a code reader, and any codes?

Does this C70 have abs sensors at the rear wheels?

Steve

gnc · Apr 7th, 2019, 11:47

last codes were. 510f. 990a and 0021 right front wheel sensor faulty signal
and im on my 3rd sensor, icase they were faulty
geof

Luxobarge · Apr 7th, 2019, 11:59

Quote:

Originally Posted by SteveSarre

I am not sure why an abs module would affect the gearbox changing up.

Because the ABS provides the gearbox and engine ECUs with a vehicle speed signal. The gearbox needs to know the road speed of the vehicle to calculate the correct time to change gear.

It's the front left (passenger side) sensor that provides this signal IIRC, so the OP's problems with the front right sensor seem odd if it's affecting speedo or gearchanging?

SteveSarre · Apr 7th, 2019, 12:00

Hi gnc,

I am not familiar with those codes. Maybe they depend on which code reader you are using.

This thread looks very relevant

https://www.matthewsvolvosite.com/fo...ic.php?t=41538

The poster had a problem which turned out to be a broken wire between the abs sensor and the abs module.

Hope you work it out.

Steve

gnc · Apr 7th, 2019, 12:04

got an autel 808 pro, reader. just tried it with it disconected, drives but no speedo.
geof

Apr 7th, 2019, 10:39	#1
gnc Junior Member Last Online: Apr 24th, 2019 12:39 Join Date: Mar 2018 Location: spalding	c70 abs fault hello. got a 2004 c70 t5 gt, auto. the abs light and traction light is on. its got new interuptor rings, new abs sensors, and ive tried the resolder of the joints in the abs ecu. question is if i take ecu off for checking is the car still drivable minus abs, and the abs fuse is also the immobilizer. also will a ude one go on with out needing programing thanks geof

Apr 7th, 2019, 11:08	#2
SteveSarre Premier Member Last Online: Yesterday 15:16 Join Date: Oct 2004 Location: London/West Country	Hi gnc In the past, I have forgotten to plug the power cable back in to the abs control module (on a 1998 or 1999 V70). I got an error code, and a warning light, and of course no ABS, but the car worked fine. I am pretty sure that completely removing the control module would have the same effect. While you are at it, get the part number off the module. If you get a used one (with the same part number) it shouldn't need reprogramming. Steve __________________ V70 2.5 Turbo AWD Man. 1999 Red V70 2.5 10V Auto 1998 Green C70 T 20V Auto Conv. 2001 Blue, C70 T5 Auto Conv. 2000 Blue V70 2.5 Turbo AWD Auto 1998 Green, V70 2.5 10V Auto BiFuel 1999 Red (scrapped) V70 20v Auto 1999 Green (scrapped) Last edited by SteveSarre; Apr 7th, 2019 at 11:10.

Apr 7th, 2019, 11:16	#4
SteveSarre Premier Member Last Online: Yesterday 15:16 Join Date: Oct 2004 Location: London/West Country	Thinking about it a bit more, you could unplug the power and the other wire to the abs module, and see what happens. If that drives ok, then OK to remove the abs module completely for testing etc. Steve __________________ V70 2.5 Turbo AWD Man. 1999 Red V70 2.5 10V Auto 1998 Green C70 T 20V Auto Conv. 2001 Blue, C70 T5 Auto Conv. 2000 Blue V70 2.5 Turbo AWD Auto 1998 Green, V70 2.5 10V Auto BiFuel 1999 Red (scrapped) V70 20v Auto 1999 Green (scrapped)

Apr 7th, 2019, 11:43	#6
SteveSarre Premier Member Last Online: Yesterday 15:16 Join Date: Oct 2004 Location: London/West Country	I am not sure why an abs module would affect the gearbox changing up. Do you have a code reader, and any codes? Does this C70 have abs sensors at the rear wheels? Steve __________________ V70 2.5 Turbo AWD Man. 1999 Red V70 2.5 10V Auto 1998 Green C70 T 20V Auto Conv. 2001 Blue, C70 T5 Auto Conv. 2000 Blue V70 2.5 Turbo AWD Auto 1998 Green, V70 2.5 10V Auto BiFuel 1999 Red (scrapped) V70 20v Auto 1999 Green (scrapped)

Apr 7th, 2019, 12:00	#9
SteveSarre Premier Member Last Online: Yesterday 15:16 Join Date: Oct 2004 Location: London/West Country	Hi gnc, I am not familiar with those codes. Maybe they depend on which code reader you are using. This thread looks very relevant https://www.matthewsvolvosite.com/fo...ic.php?t=41538 The poster had a problem which turned out to be a broken wire between the abs sensor and the abs module. Hope you work it out. Steve __________________ V70 2.5 Turbo AWD Man. 1999 Red V70 2.5 10V Auto 1998 Green C70 T 20V Auto Conv. 2001 Blue, C70 T5 Auto Conv. 2000 Blue V70 2.5 Turbo AWD Auto 1998 Green, V70 2.5 10V Auto BiFuel 1999 Red (scrapped) V70 20v Auto 1999 Green (scrapped)

Apr 7th, 2019, 11:10	#3
gnc Junior Member Last Online: Apr 24th, 2019 12:39 Join Date: Mar 2018 Location: spalding	thanks, for got to mention it effects the speedo and when cold can stop the gearbox changing up. geof

Apr 7th, 2019, 11:20	#5
gnc Junior Member Last Online: Apr 24th, 2019 12:39 Join Date: Mar 2018 Location: spalding	looks like thats what i will have to do. thanks. geof

Apr 7th, 2019, 11:47	#7
gnc Junior Member Last Online: Apr 24th, 2019 12:39 Join Date: Mar 2018 Location: spalding	last codes were. 510f. 990a and 0021 right front wheel sensor faulty signal and im on my 3rd sensor, icase they were faulty geof

Apr 7th, 2019, 12:04	#10
gnc Junior Member Last Online: Apr 24th, 2019 12:39 Join Date: Mar 2018 Location: spalding	got an autel 808 pro, reader. just tried it with it disconected, drives but no speedo. geof

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