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Author Topic: Speedo/ABS/TC strangeness  (Read 3739 times)

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Paulus

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Speedo/ABS/TC strangeness
« on: 27 February 2007, 15:46:13 »
Hi everyone,
I have had my 3.0 Omega for 6 months now without and problems. However, last week, when driving at about 30 mph, the speedo went to 0 and the ABS & TC light came on. I also think that the power steering got a little heavier (but i may have imagined this).

Anyway, it all came back to life after about 5 mins.

The same thing happened again the following day whilst on the M6 going through some roadworks with LOADS of speed cameras.

Any ideas?

Paul.
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Re: Speedo/ABS/TC strangeness
« Reply #1 on: 27 February 2007, 18:13:32 »
BTT
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TheBoy

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Re: Speedo/ABS/TC strangeness
« Reply #2 on: 27 February 2007, 18:36:42 »
Did the ABS or TC lights come on?

You can try cleaning sensors and connectors, but my experience suggest that it is going to be a 98 or later car, and that it is going to be an ABS ECU fault... :(
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Andy B

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Re: Speedo/ABS/TC strangeness
« Reply #3 on: 27 February 2007, 18:44:17 »
Quote
Did the ABS or TC lights come on?

You can try cleaning sensors and connectors, but my experience suggest that it is going to be a 98 or later car, and that it is going to be an ABS ECU fault... :(

Shhhh! Say it very quietly in case my car hears you!!  ;) Mine did the same but fixed itself before I managed to investigate - that was a couple of years back now.


Where the Autotrader before it 'fails' again?  ;D
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Re: Speedo/ABS/TC strangeness
« Reply #4 on: 27 February 2007, 18:51:50 »
Quote
Did the ABS or TC lights come on?

You can try cleaning sensors and connectors, but my experience suggest that it is going to be a 98 or later car, and that it is going to be an ABS ECU fault... :(
That should show up as a DTC in the ABS unit, right?  Are miggys one of those cars that suffer from the duff German ABS units dumping 12V onto the K-line blocking the comms for TC?
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Re: Speedo/ABS/TC strangeness
« Reply #5 on: 27 February 2007, 19:48:48 »
Quote
Quote
Did the ABS or TC lights come on?

You can try cleaning sensors and connectors, but my experience suggest that it is going to be a 98 or later car, and that it is going to be an ABS ECU fault... :(
That should show up as a DTC in the ABS unit, right?  Are miggys one of those cars that suffer from the duff German ABS units dumping 12V onto the K-line blocking the comms for TC?
It would appear that with this fault, ECU doesn't respond to diagnosis...
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Paulus

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Re: Speedo/ABS/TC strangeness
« Reply #6 on: 02 March 2007, 19:50:28 »
UPDATE

It has happened again a few times...when it does, for some reason, the LH indicator on the dash doesn't flash when the outside bulbs do. The Cruiise Control also stops working.

Strange.

Any more thoughts?
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Re: Speedo/ABS/TC strangeness
« Reply #7 on: 02 March 2007, 20:14:55 »
OK, check battery voltage at 3000 rpm....
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Paulus

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Re: Speedo/ABS/TC strangeness
« Reply #8 on: 20 March 2007, 14:41:07 »
Right then,
I haven't had time yet to try the above suggestions, but I have noticed something new.

When I start the car up and turn the wheel straight away, the steering is heavy, but then after a few seconds, I hear a click from a relay (it sounds like it is behind the clocks somewhere) and all is well again. Then, after driving for approx 5 mins, the ABS/TC lights come on and the steering gets heavy again.

Excuse my ignorance, but is there a seperate ECU for the ABS, or is it part of the main one?

Pauly.

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HI2DVY

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Re: Speedo/ABS/TC strangeness
« Reply #9 on: 20 March 2007, 15:01:03 »
Stupid question perhaps but... have you had new tyres fitted recently?

This happened to me on another Omega I had a couple of years back. I had the car in to Kwikripoff to have new tyres fitted on the back. Shortly afterwards TC and ABS would come on for a few minutes and then go off. This cycle would repeat itself regularly.

Turns out they had fitted the wrong profile of tyre to the back wheels and the front and back were running at different speeds therefore confusing the hell out of the ECU's.

Just a thought....

Dave
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RolandL

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Re: Speedo/ABS/TC strangeness
« Reply #10 on: 20 March 2007, 17:17:09 »
Quote
Hi everyone,
I have had my 3.0 Omega for 6 months now without and problems. However, last week, when driving at about 30 mph, the speedo went to 0 and the ABS & TC light came on. I also think that the power steering got a little heavier (but i may have imagined this).

Anyway, it all came back to life after about 5 mins.

The same thing happened again the following day whilst on the M6 going through some roadworks with LOADS of speed cameras.

Any ideas?

Paul.


Hi Paul, not saying this is the cause but might be worth checking http://www.omegaowners.com/forum/YaBB.pl?num=1174332608
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Re: Speedo/ABS/TC strangeness
« Reply #11 on: 20 March 2007, 20:20:23 »
Quote
Right then,
I haven't had time yet to try the above suggestions, but I have noticed something new.

When I start the car up and turn the wheel straight away, the steering is heavy, but then after a few seconds, I hear a click from a relay (it sounds like it is behind the clocks somewhere) and all is well again. Then, after driving for approx 5 mins, the ABS/TC lights come on and the steering gets heavy again.

Excuse my ignorance, but is there a seperate ECU for the ABS, or is it part of the main one?

Pauly.

ABS/TC is a seperate ECU to other ECUs in car.  This generates the speed signals for rest of car, including the speed sensitive power steering.  Alas, if yours is the MY98 onwards (VIN ends in Wxxxxxx or later), then these are known to be a bit unreliable.
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Paulus

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Re: Speedo/ABS/TC strangeness
« Reply #12 on: 21 March 2007, 13:23:10 »
Quote
Stupid question perhaps but... have you had new tyres fitted recently?

This happened to me on another Omega I had a couple of years back. I had the car in to Kwikripoff to have new tyres fitted on the back. Shortly afterwards TC and ABS would come on for a few minutes and then go off. This cycle would repeat itself regularly.

Turns out they had fitted the wrong profile of tyre to the back wheels and the front and back were running at different speeds therefore confusing the hell out of the ECU's.

Just a thought....

Dave

I have had tyres recently, but they are all the same profile.
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Paulus

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Re: Speedo/ABS/TC strangeness
« Reply #13 on: 21 March 2007, 13:28:34 »
Quote
Quote
Right then,
I haven't had time yet to try the above suggestions, but I have noticed something new.

When I start the car up and turn the wheel straight away, the steering is heavy, but then after a few seconds, I hear a click from a relay (it sounds like it is behind the clocks somewhere) and all is well again. Then, after driving for approx 5 mins, the ABS/TC lights come on and the steering gets heavy again.

Excuse my ignorance, but is there a seperate ECU for the ABS, or is it part of the main one?

Pauly.

ABS/TC is a seperate ECU to other ECUs in car.  This generates the speed signals for rest of car, including the speed sensitive power steering.  Alas, if yours is the MY98 onwards (VIN ends in Wxxxxxx or later), then these are known to be a bit unreliable.

Well, It is a 98 model, but where do I find the VIN number? The plate on the front of the engine bay doesn't have anything beginning with W. There a number starting with VP though.
« Last Edit: 21 March 2007, 13:33:31 by Paulus »
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Re: Speedo/ABS/TC strangeness
« Reply #14 on: 21 March 2007, 14:19:50 »
Quote
Quote
Quote
Right then,
I haven't had time yet to try the above suggestions, but I have noticed something new.

When I start the car up and turn the wheel straight away, the steering is heavy, but then after a few seconds, I hear a click from a relay (it sounds like it is behind the clocks somewhere) and all is well again. Then, after driving for approx 5 mins, the ABS/TC lights come on and the steering gets heavy again.

Excuse my ignorance, but is there a seperate ECU for the ABS, or is it part of the main one?

Pauly.

ABS/TC is a seperate ECU to other ECUs in car.  This generates the speed signals for rest of car, including the speed sensitive power steering.  Alas, if yours is the MY98 onwards (VIN ends in Wxxxxxx or later), then these are known to be a bit unreliable.

Well, It is a 98 model, but where do I find the VIN number? The plate on the front of the engine bay doesn't have anything beginning with W. There a number starting with VP though.
By drivers seat under plastic flap, or (easier) on the dash near passenger a post
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