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Author Topic: ABS & TC lights on  (Read 15191 times)

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Entwood

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Re: ABS & TC lights on
« Reply #30 on: 08 September 2015, 15:32:44 »
Quote from: Kevin Wood on 08 September 2015, 15:11:19
Did you drive it in-between swapping the sensor wires over?

I think it needs to see a few MPH before the ABS ECU initialises and it probably throws up codes at that point, if wheel speeds don't match closely enough to be plausible, or if any are missing.

Bugger .. nope ... so tomorrows job is back to swapping with a bit of driving inbetween ... but it'll be easier to do that than to change the ECU .. so here's hoping ....  :y :y
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Marks DTM Calib

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Re: ABS & TC lights on
« Reply #31 on: 08 September 2015, 15:35:23 »
Drive it and monitor live data, should show wheel speeds.  :y
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TheBoy

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Re: ABS & TC lights on
« Reply #32 on: 08 September 2015, 18:25:27 »
It doesn't really matter which ECU you pick, the codes (and live data) will be the same.

As DTM says, watch Live Data (Measuring Blocks on that PoS) for the 4 wheel sensors. They should all read the same in a straight line, with outside wheels reading slightly higher on corners.
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Entwood

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Re: ABS & TC lights on
« Reply #33 on: 08 September 2015, 18:54:04 »
Magic, thanks for the info .. I'll give it a try tomorrow hopefully. Appreciate the help :)
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Entwood

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Re: ABS & TC lights on
« Reply #34 on: 21 September 2015, 09:37:30 »
As the chaos in the entwood household slowly subsides  ....  I've had a few moments to actually get the reader onto the car .. but not yet done any "swapping" of connections ... however I doubt it will achieve much any way ... :(

Fault code... 0035 ... front left sensor open circuit/rear left sensor open circuit.

Take it for a drive and read the values ....

Front left wheel - no speed indicated at any time
FRONT RIGHT WHEEL - no speed indicated at any time
Rear left - speed indicated continually and agrees with speedo
rear right - speed indicated continually and agrees with speedo

So the diagnostic disagrees with the actual read values from the sensors

Resetting changes nothing

Looks to me like an ECU problem ??

Any other advice gratefully accepted !!
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Kevin Wood

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Re: ABS & TC lights on
« Reply #35 on: 21 September 2015, 09:57:49 »
.. or your code reader has the codes confuddled, perhaps?

I wonder if there's any wiring or a connector somewhere that's common to both front wheels?
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Kevin Wood

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Re: ABS & TC lights on
« Reply #36 on: 21 September 2015, 10:03:28 »
Actually, just checked the diagram, and the wheel sensors go straight into the ECU with no intervening connectors, and each is completely independent.

Front left sensor is connected to ECU pins 6 and 7, Front right to ECU pins 4 and 5. Rear left pins 8,9. Rear right 1,2.

If you can get to the ECU connector easily, I would try measuring resistance across each of the pin pairs above and see if they are similar. I'd expect them to be a few hundred ohms at a guess. Can also put an oscilloscope across them and see if you get a signal when spinning the wheel.

If the signals are there at the ECU connector, then I'd agree that the ECU is probably at fault.
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Entwood

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Re: ABS & TC lights on
« Reply #37 on: 21 September 2015, 11:54:07 »
Thanks very much for that Kevin... chances of me getting a scope onto it are nil !

I don't really see 2 sensors failing at exactly the same time, and the Fault code presentation also being in error at the same time .. so it all adds up - in my tiny mind - to a common point .. and the only common point is the ECU.

Methinks I'll put an advert in for an ECU and see if I can get one within a week or so ... then its one (balls aching) job changing them over and seeing what occurs. If not its take mine off and send it away for checking/repair which makes it more of a pain to do over a couple of days.
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tunnie

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Re: ABS & TC lights on
« Reply #38 on: 21 September 2015, 12:00:13 »
Perhaps a real tech2 plug in might help? Does sound like code reader is not on the right lines, if the sensor data is fine.

I guess if you did swap them over, be interesting to see if the fault changed to rear right open circuit?
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Entwood

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Re: ABS & TC lights on
« Reply #39 on: 21 September 2015, 12:19:26 »
mmm I suppose whilst seeing if an ECU comes up in the sales section a quick trip over to Jamie's - if it is convenient - wouldn't do any harm ....
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Entwood

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Re: ABS & TC lights on
« Reply #40 on: 24 September 2015, 13:03:43 »
Thanks to Joff I now have an ECU .... just need a day next week to swear at it lots !!
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terry paget

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Re: ABS & TC lights on
« Reply #41 on: 26 September 2015, 21:30:37 »
Cnanging the ECU is not too bad a job. The guide here makes hard work of it. I have described before on this forum how best to do it. If you are not aware of the easy way, ask and I will describe it again.
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terry paget

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Re: ABS & TC lights on
« Reply #42 on: 27 September 2015, 11:38:36 »
I reiterate - do not follow the forum guide, which I have just revisited. I reckon I could change the ABS ECU in less time than it would take you to remove the transfer pipe, a task in the preamble of the forum guide.
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Entwood

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Re: ABS & TC lights on
« Reply #43 on: 27 September 2015, 22:21:05 »
Could you PM or email me your version ?? be very interested to do it an easier way than the guide !!

I'll try anything (once) and will even try and take photo's to make a guide version 2 if it helps anyone else !!
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terry paget

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Re: ABS & TC lights on
« Reply #44 on: 28 September 2015, 13:48:12 »
Quote from: Entwood on 27 September 2015, 22:21:05
Could you PM or email me your version ?? be very interested to do it an easier way than the guide !!

I'll try anything (once) and will even try and take photo's to make a guide version 2 if it helps anyone else !!
Will do. Of course my previous epistle must be somewhere on the forum, but it will be easier to do it again than search for it.
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