General ABS warning light

tonyn

New member
Joined
Sep 15, 2013
Messages
114
I was changing the nearside front shock on my 2004 1.2 Dynamic and as it was getting dark,I manage to crimp the feed wire to the ABS sensor behind the head of one of the shocker retaining bolts.
I thought i may have got away with it as there didnt appear to be any broken or damaged wires.
Not so.
When I fired up after putting everthing back together, I now have the ABS warning light illuminated on the dash.
My question is this, How much of a job is it to swap the sensor and will I have to plug in to Multiscan to put out the ABS light?
Thanks in advance
Tony
 

A3jeroen

Well-known member
Joined
Sep 23, 2007
Messages
2,169
Location
Alkmaar, Netherlands
Changing a sensor is relatively easy. Look for the connector and disconnect. The sensor itself is usually held in with a 5mm Allen bolt. Getting the sensor out requires some serious wiggling.
Light should go out by itself after replacing the sensor. SRS (airbags and belts) light requires resetting.

gr J
 

DaveMcT

Well-known member
Joined
Sep 14, 2009
Messages
17,867
If the light comes on when you start the car you can be pretty sure it's a sensor or the wiring leading to it.

If the light comes on after you have moved away, it's likely the magnetic track on the wheel bearing is not creating enough of a signal.
 

TL100HP

New member
Joined
Jan 27, 2017
Messages
32
If the light comes on after you have moved away, it's likely the magnetic track on the wheel bearing is not creating enough of a signal.

On my Panda the ABS light comes on when I pass the 30 MPH, how can I check this magnetic track? Is there one track for wheel?
The ABS is working fine, I mean it works...
 

A3jeroen

Well-known member
Joined
Sep 23, 2007
Messages
2,169
Location
Alkmaar, Netherlands
Sounds like a difference in circumference to me.
ABSsensors I've tested gave around 5V AC at 50 Km/h. I tested with a multimeter inside the car and long cable.

gr J
 

DaveMcT

Well-known member
Joined
Sep 14, 2009
Messages
17,867
You will need to get more information from the ECU as it will probably show that one wheel is seen by the ABS as running slow.


Slow wheel can be the wrong tyre, mag track on bearing losing its magnetism or the sensor.

Rear hubs are so cheap and easy to replace it's almost worth doing them anyway. Front wheel bearings are a lot more trouble. They all have a magnetic disc attached to the bearing inner grease seal. Pulses from that are seen by the ABS sensor.
 

TL100HP

New member
Joined
Jan 27, 2017
Messages
32
Slow wheel can be the wrong tyre, mag track on bearing losing its magnetism or the sensor.

Rear hubs are so cheap and easy to replace it's almost worth doing them anyway. Front wheel bearings are a lot more trouble. They all have a magnetic disc attached to the bearing inner grease seal. Pulses from that are seen by the ABS sensor.

ECU test are not cheap.
I just order a new battery and next week I will mount new Michelin X-ice tyres.
I will do a follow up about this issue ;);)
 

DaveMcT

Well-known member
Joined
Sep 14, 2009
Messages
17,867
There is no point testing the ECU its doing it's job.

MultiECUScan and a Windows laptop will allow you to interrogate the fault codes.
 

koalar

Well-known member
Joined
Oct 24, 2016
Messages
4,004
On my Panda the ABS light comes on when I pass the 30 MPH, how can I check this magnetic track? Is there one track for wheel?
The ABS is working fine, I mean it works...

interrogate each wheel sensor with multiecuscan. Live data from the 4 sensors is possible with the free version
 

TL100HP

New member
Joined
Jan 27, 2017
Messages
32
There is no point testing the ECU its doing it's job.

MultiECUScan and a Windows laptop will allow you to interrogate the fault codes.

Thank you Dave.
Where can I download the program? What else do I need? A cable? Is there a guide to use this MultiECUScan somewhere? What is it possible to do with it? Do you recommend it?
 

TL100HP

New member
Joined
Jan 27, 2017
Messages
32
Slow wheel can be the wrong tyre, mag track on bearing losing its magnetism or the sensor.

Rear hubs are so cheap and easy to replace it's almost worth doing them anyway. Front wheel bearings are a lot more trouble. They all have a magnetic disc attached to the bearing inner grease seal. Pulses from that are seen by the ABS sensor.

Battery changed.
Wheels changed.
Tyres changed.

The ligth now just come on at a higher speed (60 mph), but not always, it does seem a really random issue.
Which hubs do you recommend? Original? SKF? Something else? I will change all 4 in the spring season
 

DaveMcT

Well-known member
Joined
Sep 14, 2009
Messages
17,867
You "could" change all the wheel bearings at £30 a corner plus labour. Alternatively, MultiECUscan is free** and will tell you what's going on.

**Full function version is under £50 - still a bargain.
 
Top