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Do it yourself ABS module repair. Topic is solved

Help, Advice and DIY Tutorials on Volvo's P80 platform cars -- Volvo's 1990s "bread and butter" cars -- powered by the ubiquitous and durable Volvo inline 5-cylinder engine.

1992 - 1997 850, including 850 R, 850 T-5R, 850 T-5, 850 GLT
1997 - 2000 S70, S70 AWD
1997 - 2000 V70, V70 AWD
1997 - 2000 V70-XC
1997 - 2004 C70

This topic is in the MVS Volvo Repair Database » Do It Yourself ABS Module Repair
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volkans80
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Re: Do it yourself ABS module repair.

Post by volkans80 »

When measure the wires with multimeter, it shows 0 ohm.

454cid
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Post by 454cid »

volkans80 wrote: 06 Apr 2023, 17:04 When measure the wires with multimeter, it shows 0 ohm.
I'm not sure that is meaningful. Motors generally have coils of wire inside that may provide for continuity between the two wires.
1996 850
1999 S70 GLT (sold after deer hit)

2010 Ford Focus SE
2006 Cadillac CTS
1996 Mercedes C220
1999 Chevrolet K3500
1969 Buick LeSabre Custom 400

volkans80
Posts: 33
Joined: 6 June 2013
Year and Model: 96 850T5, 08 XC70 D5
Location: Turkey
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Post by volkans80 »

454cid wrote: 07 Apr 2023, 01:03
volkans80 wrote: 06 Apr 2023, 17:04 When measure the wires with multimeter, it shows 0 ohm.
I'm not sure that is meaningful. Motors generally have coils of wire inside that may provide for continuity between the two wires.
You're right, but shouldn't there be a small resistance anyway? Do you think I should give 12 volts to 0 ohm wires and try to run the motor?

454cid
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Post by 454cid »

volkans80 wrote: 07 Apr 2023, 02:29
454cid wrote: 07 Apr 2023, 01:03
volkans80 wrote: 06 Apr 2023, 17:04 When measure the wires with multimeter, it shows 0 ohm.
I'm not sure that is meaningful. Motors generally have coils of wire inside that may provide for continuity between the two wires.
You're right, but shouldn't there be a small resistance anyway? Do you think I should give 12 volts to 0 ohm wires and try to run the motor?
Is it off the car already? I'm not sure what running the motor will do when it's not working in the ABS system.

Again, what makes you think the motor is shorted? What problem are you having?
1996 850
1999 S70 GLT (sold after deer hit)

2010 Ford Focus SE
2006 Cadillac CTS
1996 Mercedes C220
1999 Chevrolet K3500
1969 Buick LeSabre Custom 400

volkans80
Posts: 33
Joined: 6 June 2013
Year and Model: 96 850T5, 08 XC70 D5
Location: Turkey
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Post by volkans80 »

454cid wrote: 07 Apr 2023, 13:05
volkans80 wrote: 07 Apr 2023, 02:29
454cid wrote: 07 Apr 2023, 01:03

I'm not sure that is meaningful. Motors generally have coils of wire inside that may provide for continuity between the two wires.
You're right, but shouldn't there be a small resistance anyway? Do you think I should give 12 volts to 0 ohm wires and try to run the motor?
Is it off the car already? I'm not sure what running the motor will do when it's not working in the ABS system.

Again, what makes you think the motor is shorted? What problem are you having?
No it is not off the car. The ABS control module was giving a wheel sensor error. A few times I disassembled the module and re-soldered the sensor leads because after a month of working properly, it was giving the sensor error again. The last time I saw the motor wires stripped. I was wondering if it was a short circuit. It showed 0 ohms when measured. Then I removed the outer plastic of the abs motor and saw that the wires were not touching each other. I can't remember exactly, but I think I saw the abs motor error in my last attempt. After that, I just left it.

454cid
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Post by 454cid »

Off all the things that could go wrong with the ABS, the motor would not be something I'd worry about. The modules are known to go bad, and wheel sensors and wiring get exposed to road debris and flexing. I'd suspect the wiring going to the wheels before the motor. Even with a motor error being reported, if the module isn't working right, I'd suspect the motor error to be false. Have you seen MidwestABS's troubleshooting page? https://midwest-abs.com/troubleshooting

Looks like he says .5-5ohms on the motor. When you say 0 ohms, how are you measuring that? Can your meter measure less than 1 ohm?
1996 850
1999 S70 GLT (sold after deer hit)

2010 Ford Focus SE
2006 Cadillac CTS
1996 Mercedes C220
1999 Chevrolet K3500
1969 Buick LeSabre Custom 400

volkans80
Posts: 33
Joined: 6 June 2013
Year and Model: 96 850T5, 08 XC70 D5
Location: Turkey
Has thanked: 1 time

Post by volkans80 »

454cid wrote: 07 Apr 2023, 14:36 Off all the things that could go wrong with the ABS, the motor would not be something I'd worry about. The modules are known to go bad, and wheel sensors and wiring get exposed to road debris and flexing. I'd suspect the wiring going to the wheels before the motor. Even with a motor error being reported, if the module isn't working right, I'd suspect the motor error to be false. Have you seen MidwestABS's troubleshooting page? https://midwest-abs.com/troubleshooting

Looks like he says .5-5ohms on the motor. When you say 0 ohms, how are you measuring that? Can your meter measure less than 1 ohm?
Troubleshooting page is very good. Thank you, i will measure the motor with another multi meter. When I measured it before, I measured it by taking the minimum level of 200 ohms, maybe the multi meter cannot measure the value of less than one ohm.

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