Omega Owners Forum - TC light comes on when accelerating hard at speed

MV6Matt

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Re: TC light comes on when accelerating hard at speed
Reply #15 - 19. Feb 2010 at 13:17

No. But worth paperclipping once a week or so, just to keep an eye on if that pesky 19 appears.

>>TB - bit confused Huh

- I'm on 19" rubber - the code is 21 not 19

Worth looking into the TPS - the engine and ABS ECUs talk a lot, and I reckon a flickering TC light was the warning sign of my crank sensor. So its possible the engine ecu is upsetting/confusing the ABS ecu when running in an 'error/recovery' program

>> Ok my TC light doesn't flicker but stays on when booted. Clears after restarting. Will keep an eye on TPS

Ta Matthew

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Entwood

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Re: TC light comes on when accelerating hard at speed
Reply #16 - 19. Feb 2010 at 13:28

Just a thought .. if you are on 19" wheels .. and the standard wheels are either 15", 16" or 17", unless you have REALLY skinny tyres your overall wheel/tyre circumference will be somewhat larger than standard.

Now under hard acceleration the engine will attempt to speed up at a certain rate, controlled by the ECU, but the wheels on your car being larger, will not achieve that ... Could it be that the ecu is "expecting" the wheels to rotate at a certain rate, and the ABS sensors detect the wheel rotation being slower and so flag up a fault ???

Undecided

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« Last Edit: 19. Feb 2010 at 13:30 by Entwood »

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TheBoy

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Re: TC light comes on when accelerating hard at speed
Reply #17 - 19. Feb 2010 at 14:38

MV6Matt wrote on 19. Feb 2010 at 13:17:

No. But worth paperclipping once a week or so, just to keep an eye on if that pesky 19 appears.

>>TB - bit confused Huh

- I'm on 19" rubber - the code is 21 not 19

Worth looking into the TPS - the engine and ABS ECUs talk a lot, and I reckon a flickering TC light was the warning sign of my crank sensor. So its possible the engine ecu is upsetting/confusing the ABS ecu when running in an 'error/recovery' program

>> Ok my TC light doesn't flicker but stays on when booted. Clears after restarting. Will keep an eye on TPS

Ta Matthew

Ah, right

I think you probably need to get the ABS ECU codes read. Not sure where in London you are, but I'm near Northampton, Kevin Wood is near Alton/Hampshire.

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Andy H

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Re: TC light comes on when accelerating hard at speed
Reply #18 - 19. Feb 2010 at 16:22

Entwood wrote on 19. Feb 2010 at 13:28:

Just a thought .. if you are on 19" wheels .. and the standard wheels are either 15", 16" or 17", unless you have REALLY skinny tyres your overall wheel/tyre circumference will be somewhat larger than standard.

Now under hard acceleration the engine will attempt to speed up at a certain rate, controlled by the ECU, but the wheels on your car being larger, will not achieve that ... Could it be that the ecu is "expecting" the wheels to rotate at a certain rate, and the ABS sensors detect the wheel rotation being slower and so flag up a fault ???

Undecided

I think MotoGP bikes monitor how quickly the rotation of the rear wheel is increasing to control wheelspin because they havn't got anything else to monitor (they can't rely on the front wheel it is off the ground half the time)

I think the Omega just compares instantaneous rotation of one back wheel to the other (and perhaps to the front as well). If it was looking at rotation increasing too quickly then a larger rolling radius would reduce the effect (not make it more sensitive).
I don't see why increasing too slowly would imply wheelspin. Undecided

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« Last Edit: 19. Feb 2010 at 16:26 by Andy H »

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TheBoy

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Re: TC light comes on when accelerating hard at speed
Reply #19 - 19. Feb 2010 at 16:35

Andy H wrote on 19. Feb 2010 at 16:22:

Entwood wrote on 19. Feb 2010 at 13:28:

Just a thought .. if you are on 19" wheels .. and the standard wheels are either 15", 16" or 17", unless you have REALLY skinny tyres your overall wheel/tyre circumference will be somewhat larger than standard.

Now under hard acceleration the engine will attempt to speed up at a certain rate, controlled by the ECU, but the wheels on your car being larger, will not achieve that ... Could it be that the ecu is "expecting" the wheels to rotate at a certain rate, and the ABS sensors detect the wheel rotation being slower and so flag up a fault ???

Undecided

I think MotoGP bikes monitor how quickly the rotation of the rear wheel is increasing to control wheelspin because they havn't got anything else to monitor (they can't rely on the front wheel it is off the ground half the time)

I think the Omega just compares instantaneous rotation of one back wheel to the other (and perhaps to the front as well). If it was looking at rotation increasing too quickly then a larger rolling radius would reduce the effect (not make it more sensitive).
I don't see why increasing too slowly would imply wheelspin. Undecided

Omega learns its wheel sizes over the first couple of miles, so thats never an issue.

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If you are going to kick a car, remember to wear appropriate footwear
Any posts are the result of my own views as a member of OOF, which may or may not be the same as my views as part of the Admin Team.

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biggriffin Intermediate Member Offline Posts: 302 cambs Drives: big n white.	Re: TC light comes on when accelerating hard at speed Reply #20 - 19. Feb 2010 at 20:08 try to acclerate a bit slower. its not a jelly mould corsa. would check the tps sensor as thats the code your getting.
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MV6Matt Senior Member Offline On 19's with 3 litre cams and Irmscher kit Posts: 812 London Gender: Drives: '98 2.5 V6 CDX Estate (in MV6 guise with lots of Irmscher)	Re: TC light comes on when accelerating hard at speed Reply #21 - 20. Feb 2010 at 08:53 OK thanks for all the advice - as it's Cambelt time next month I will get the TPS checked out as well as ABS ECU at same time. I will see who's available on here and get it all done at same time I guess. Thanks again Matthew
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