Omega Owners Forum
Omega Help Area => Omega Electrical and Audio Help => Topic started by: countrywoman on 08 June 2025, 16:16:01
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Okay so got my Snap On code reader working, it says fault code 35 pressure release relay fault. (same as Ds diagnostic tool) so does this mean it needs a rebuild? I take its not referring to the 2 50amp electrical relays on the top?
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That sounds like a red herring :-\
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So do I have to send it off to be checked out, TBH its been sat over 20 years.
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So do I have to send it off to be checked out, TBH its been sat over 20 years.
Wouldn't be the worst idea unless the wiring diagrams clearly indicate what/where the pressure release relay is for testing purposes.
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Just found an online Vauxhall repair manual, PIA to find what I wanted but it said code 35 due to pump not making pressure after 3 secs or pump not turning off. Looks like it will defo have to be serviced.
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is the unit fully installed and bled ?
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is the unit fully installed and bled ?
Oh! I wonder if it needs connecting to a Tech 2 type thing to cycle the pump to get the air out to allow it to build pressure:/
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is the unit fully installed and bled ?
Oh! I wonder if it needs connecting to a Tech 2 type thing to cycle the pump to get the air out to allow it to build pressure:/
Surely a snap off scanner should manage that :-\
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Thats my task for Fri, well check the pump runs first!
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is the unit fully installed and bled ?
Oh! I wonder if it needs connecting to a Tech 2 type thing to cycle the pump to get the air out to allow it to build pressure:/
Surely a snap off scanner should manage that :-\
I don't use anything more nuanced than a hammer so no experience, anything like that I visit my guru :D
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Well neither my scanner or Ds modern one will support activation of pump, tried to get the relays out to bridge pump feed but only the top came off one (not the one I wanted) and the other refuses to budge. D will see if the folks he sends ABS units to can fix this one on Monday.
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Its working, yup works better with the earth lead on the motor!!!! I know why I missed it as unit fitted before engine and it was hidden, only saw it today as doing some checking /snagging jobs and was lay underneath.
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Been there, or similar at least. You dont know whether to laugh ,cry ,or do a silly dance. ;D
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LOL, nice easy fix in the end ;D
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Yes but now it says brake switch fault but that works , checked the wiring and all looks okay. Brakes do need bleeding as a bit long travel when servo working. Only 2 wires on switch by the way.
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Early petrol V6 have 2 wire brake switch if non-cruise, or 4 wire if fitted with cruise
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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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It was the under dash tray pushing the switch up, bit more panel cutting then!!!
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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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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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Speedo is probably out due to tyre size.
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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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205/65/15 is the original size.
And the speed signal comes from the front left hub.
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Very minimal difference if calculated like
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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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(https://i.postimg.cc/8kHfx2zX/Screenshot-20250717-142904-Gallery.jpg)
So, if calculated like this the difference is about 0.5% if calculated right.
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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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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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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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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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165/80/15 should be spot on , 795 revs per mile and797 for the 235/55 /17. 205/65/15 are 792.
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The abs ECU might not be seeing that way.
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That was my thought. Needs a live data reading to see the signal. I think I can do that with the scanner.
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Measured the front tyre ,it is what the listing said for diameter within the size of a 205/65/15 allowing for wear. not had chance to do live data as still snagging stuff.