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Author Topic: Further ABS fault  (Read 139552 times)

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TheBoy

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Re: Further ABS fault
« Reply #15 on: 16 June 2025, 17:28:27 »
Early petrol V6 have 2 wire brake switch if non-cruise, or 4 wire if fitted with cruise
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countrywoman

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Re: Further ABS fault
« Reply #16 on: 16 June 2025, 17:43:19 »
Yes thats what I thought, I checked wiring dia and it just feeds ABS from same wire as feed to brake lights. I checked for continuity and that was fine. More head scratching then.
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Re: Further ABS fault
« Reply #17 on: 17 June 2025, 16:58:43 »
It was the under dash tray pushing the switch up, bit more panel cutting then!!!
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Re: Further ABS fault
« Reply #18 on: 15 July 2025, 14:09:48 »
Okay ,found pedal a bit hit and mis turning switch off. Stuck a bit of rubber to the pedal and see how that goes, now it says ECU fault. Only comes on after driving a good few hundred yards, speedo is out showing 25 at 30. Makes me wonder if tyre size is out? But the 235/45/17 is the same radius on tyre chart. Does the speedo work of rear tyres/abs sensor?
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Re: Further ABS fault
« Reply #19 on: 16 July 2025, 08:48:42 »
Are all the drive shaft inner joints the same number of teeth on reluctor ring? just a thought as used 2L shafts , it would explain why speedo is out?
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Re: Further ABS fault
« Reply #20 on: 16 July 2025, 20:10:05 »
Speedo is probably out due to tyre size.
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countrywoman

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Re: Further ABS fault
« Reply #21 on: 16 July 2025, 20:52:18 »
according to tyre size chart its the same diameter as the original , I put tape mark on front and rear tyres and rolled it forward and they are both the same.
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Re: Further ABS fault
« Reply #22 on: 17 July 2025, 09:06:16 »
205/65/15 is the original size.

And the speed signal comes from the front left hub.
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polilara

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Re: Further ABS fault
« Reply #23 on: 17 July 2025, 12:06:38 »
Very minimal difference if calculated like
« Last Edit: 17 July 2025, 12:08:28 by polilara »
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Re: Further ABS fault
« Reply #24 on: 17 July 2025, 12:19:35 »
Quote from: countrywoman on 16 July 2025, 20:52:18
according to tyre size chart its the same diameter as the original , I put tape mark on front and rear tyres and rolled it forward and they are both the same.
One rotation won't highlight any slight difference. The error compounds with distance.
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polilara

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Re: Further ABS fault
« Reply #25 on: 17 July 2025, 12:37:19 »


So, if calculated like this the difference is about 0.5% if calculated right.
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Re: Further ABS fault
« Reply #26 on: 17 July 2025, 13:59:12 »
Closer than that if the online calculator is right, you get more than that with different makes and between new and worn.
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Re: Further ABS fault
« Reply #27 on: 17 July 2025, 15:14:05 »
What about the fronts of your running different sizes?

The omega didn't have staggered wheels as standard so the ABS programming will be seeing different things to what is expected.
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Re: Further ABS fault
« Reply #28 on: 17 July 2025, 16:41:15 »
165x15 they are the same radius according to the size chart, I am sure it had 195/65/15 on it ,still have the wheels so will double check.
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Re: Further ABS fault
« Reply #29 on: 17 July 2025, 16:45:43 »
Quote from: countrywoman on 17 July 2025, 16:41:15
165x15 they are the same radius according to the size chart, I am sure it had 195/65/15 on it ,still have the wheels so will double check.
They'd need to have an aspect ratio of about 80 to be even close.
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