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Author Topic: ABS Warning light  (Read 155 times)

Offline mrhiviz

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  • Posts: 78
  • Thanked: 3
  • Model: Galaxy Mk2
  • Spec: 04 Tdi 115 Claimed
  • First Name: Leon
  • Region: Non UK
  • Country: France
ABS Warning light
« on: October 11, 2020, 01:57:30 PM »
Hi All.
I  hope all is well and everyone is staying safe .
I have an ABS puzzler for you.

The ABS warning light has actually been on for a long time but the French MOT was listing it as a advisory. I have made various attempts to solve it over the years. The new style MOT now lists it as a major fault and so I have to get it sorted.

The Vagcom results as follows:

Thursday, 08 October 2020, 10:51:47.VCDS-Lite Version: Release 1.2 Control Module Part Number: 7M3 907 379 G  Component and/or Version: ABS FRONT MK25      0102           Software Coding: 0007689            Work Shop Code: WSC 00020                      VCID: 41F5C60758911

Fault Found:00285 -  ABS Wheel Speed Sensor; Front Right (G45)        003 -  Mechanical Failure - Intermittent

1. I replaced the outer cable with a cheapo pattern job in September and the light actually went out.  Result!  However, when coming to a halt, the ABS kicks in for the last half metre to a metre. I assume this is the intermittent  signal failure , which would probably result in an unsafe to drive fault in the MOT

2. I then replaced the cable with a genuine ATE one: The light came back on and gives the code above!

3. I have since had the whole front suspension overhauled and fitted new ABS Rings at the same time. (I noticed that the sensor was touching the ring and scoring it.) No difference.

I need to try the pattern cable with the new rings.

I  will have to check resistance measurements.

Other factors I have ruled out as they occured after the light came on: The LHS tyre was replaced with identical model after hitting debris in the road, so it is a bit newer. Tyre pressures are checked regularly. LHS ABS cable replaced recently after the old one worked loose and was worn through by the brake disc.
It would appear that the RH wheel is definitely losing signal, probably not at the wheel end. Iím assuming the computer is OK as surely it is just not getting the required info.

Q1:  If the fault is possibly between the computer and the outer cable. Where is the main cable routed and is it replaceable?

Q2:  How do I measure resistance and what should the readings be?

I thank you in advance for any advice.

Online johnnyroper

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  • Model: Galaxy Mk2
  • Spec: 02 tdi 115 ghia
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Re: ABS Warning light
« Reply #1 on: October 11, 2020, 11:52:42 PM »
Donít know what resistance should be but if you get a circuit drawing you can identify ECU pin outs and measure resistance of another speed  sensor as a reference. In terms of cable routing if it was me I wouldnít worry about routing the same I would look at pin outs and splice in a 2 core screened cable and route it down to speed sensor plug the easiest possible way where it avoids points of heat and areas where it could be damaged.

Offline mrhiviz

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  • Posts: 78
  • Thanked: 3
  • Model: Galaxy Mk2
  • Spec: 04 Tdi 115 Claimed
  • First Name: Leon
  • Region: Non UK
  • Country: France
Re: ABS Warning light
« Reply #2 on: October 13, 2020, 08:06:21 AM »
Thanks for that. I assume I will attach it to the bulkhead with the other wiring. I'm going to look for some cable today.  I still need to investigate how to measure the output of the sensor. I had seen it on the forum so I will have to keep digging.
L

Online johnnyroper

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  • Spec: 02 tdi 115 ghia
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Re: ABS Warning light
« Reply #3 on: October 13, 2020, 10:48:01 PM »
A quick crude way of checking sensor with a standard multi meter is measure voltage on AC spinning wheel by hand 1 revolution per second should read roughly 0.3-2.0 volts.
As said donít know what the resistance should be but usually a wheel speed sensor is somewhere in the 800-1500 ohm range. I would check at speed sensor plug and again at ECU plug to compare readings.

Offline mrhiviz

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  • Posts: 78
  • Thanked: 3
  • Model: Galaxy Mk2
  • Spec: 04 Tdi 115 Claimed
  • First Name: Leon
  • Region: Non UK
  • Country: France
Re: ABS Warning light
« Reply #4 on: October 15, 2020, 01:24:10 PM »
Thanks for that. Will have a go at getting measurements over the weekend.

 

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