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Vectra C power steering communications fault

Discussion in 'Cavalier, Calibra, Vectra, Signum, Sintra & Insignia owners forum' started by hoyler, Feb 25, 2012.

  1. hoyler

    hoyler Member

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    Location:
    Sheffield, UK
    Hi forum. I've got an ongoing problem with the electrics on my 1.9cdti SRi 150 (06). A few of you have helped me up to now, that I'm grateful for, but I'm still struggling and hope there's a generous sole out there that can help me a bit more.

    I've had a charging fault that I eventually traced to what I think must be a broken wire in the loom. It was the small blue/white wire from the back of the alternator so I've put in a temporary wire from the ECU end of it back to the alternator and the charging now seems to be OK. However, when I first got the fault I also lost the power steering. I've bought opcom and tried to clear the fault codes but when I try and talk to the power steering it says 'communicatons error, or ECU has rejected the request'. I'm guessing that if one wire in the loom was damaged then there's a good chance the power steering ones are too. I've got three plugs on the power steering unit, a big one which I guess is the power and then two smaller ones, one with three wires and one with five. Does anyone know which ones are the communications circuit to the main ECU (under the off-side wing) and what colour the wires are?

    Any help is much appreciated.

    Rob.
     
  2. nickymadd63

    nickymadd63 VxON Club Member VxON Club Member

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    Location:
    morpeth, northumberland
    Drives:
    Vectra 2.0 dti, Signum2.2 elite direct,Honda CBR 1100XX
    it may be that the settings on the opcom need changing not sure on what comes next and someone with more info might step in, I'm thinging that it needs to be B and if that does not work try C in the first screen choose settings and change to B or C and try, they can be a bit funny to use and if putting in security code you might want to put it in the imobliser part first under securty code, dont know why but after you have then it takes the code in other places in the system.
     
  3. nickymadd63

    nickymadd63 VxON Club Member VxON Club Member

    Messages:
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    Location:
    morpeth, northumberland
    Drives:
    Vectra 2.0 dti, Signum2.2 elite direct,Honda CBR 1100XX
    also for some reason the alternators seem to give up at 100000 miles
     
  4. hoyler

    hoyler Member

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    Location:
    Sheffield, UK
    Ended up stripping the wiring loom out today between the main ECU and the EHPS. I found three wires that had been trapped and had eventually corroded and broken. One of them was the blue/white one for the alternator so that explained that fault. The other two were a green one and a black/white one which looking at the plug on the EHPS unit are two of the five power steering wires. I repaired all three and the charging circuit now works without my temporary wire but the power steering is still dead. Opcom still says it can't communicate with the ECU. I've tried settings B and C on opcom and it makes no difference.

    Anybody got any ideas why the units still won't communicate even though I've repaired the wires?
     
  5. nickymadd63

    nickymadd63 VxON Club Member VxON Club Member

    Messages:
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    Location:
    morpeth, northumberland
    Drives:
    Vectra 2.0 dti, Signum2.2 elite direct,Honda CBR 1100XX
    prehaps when the wires got trapped and prehaps shorted it might have fried something, or prehaps you have a fuse or 2 blowensecond answer sounds better then the first.
     
  6. hoyler

    hoyler Member

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    Location:
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    Hi mate. I've checked every fuse I can find on the whole car and can't find one blown. I'm starting to wonder if it's something to do with the resistance of the crimp connectors I've used but I can't see it somehow, or even worse the chip in EHPS unit is dead. It's doing my head in now! It's taken me three weeks to get this far with it and £90 for an alternator that I probably never needed! I'm on the verge of selling it as a non runner.
     
  7. nickymadd63

    nickymadd63 VxON Club Member VxON Club Member

    Messages:
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    Location:
    morpeth, northumberland
    Drives:
    Vectra 2.0 dti, Signum2.2 elite direct,Honda CBR 1100XX
    looking at the manual the steering fuse is no 9 under the bonnet but also no 10 in passanger door frame does control unit steering column, not sure if that links to the steering.
     
  8. nickymadd63

    nickymadd63 VxON Club Member VxON Club Member

    Messages:
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    Location:
    morpeth, northumberland
    Drives:
    Vectra 2.0 dti, Signum2.2 elite direct,Honda CBR 1100XX
    im thinking you will have to see if its the motor or power problem, does it have power to the motor, might need a multi meter, just got to work through the system.
     
  9. Fire26662

    Fire26662 There can be only one.

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    Have you tried a module presence check in OPCOM? you may also need to check the other modules like the UEC, to see if there are any communication faults.
     

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