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Thread: Rev counter not working

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    Default Rev counter not working

    HI Guys

    Ive recently bought a 2005 vectra cdti sri. Its a beautiful car and drives perfectly, but today i noticed the revs on the dash dial didn't match what the engine was actually doing.

    Basically, they sit at around 500 and then when the turbo kicks in the counter jumps into the red. Its got me totally confused and worried this might be a serious problem.

    The rest of the dash works fine and no warning lights are on. All controls/ speedo are perfect. Only the rev counter is wrong.

    Has anyone here ever seen this before?

  2. #2
    Regular Member Ben50n's Avatar
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    Think you need to find where the rev counter takes it pick up off? Possibly a crank or cam sensor? Check the connectors for corrosion, squirt some WD40 into them and work them in and out a few times.

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    Regular Member MrDerv's Avatar
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    If it was Cam sensor or Crank, you'd have a spanner light thrown up on the dash, and possibly running issues too.

    I'd see if you can remove the dash cluster and check the plug connection to make sure it's sitting securely.

    Failing that, you may have a duff dash
    Last edited by MrDerv; 4th March 2012 at 19:21. Reason: typo

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    Could it not be the CIM?

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    Full Member gibbon7000's Avatar
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    Quote Originally Posted by tony-1977 View Post
    Could it not be the CIM?
    I was just thinking the same

    My other car. 1972 1641cc slammed beetle. On the road finally!!

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    Quote Originally Posted by tony-1977 View Post
    Could it not be the CIM?
    Ok... and whats that?

    I'm no good with cars -at all. I have no idea how to go about removing the dash. Is there any guides/instructions and how difficult is it?

    Thanks for all the replies btw

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    Full Member gibbon7000's Avatar
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    The cim is like an ECU for all the dash electrics (maybe more) I think i'm right in saying they have to be programmed to the car with tech2. I do believe the cost is about £400-£500 all in.

    My other car. 1972 1641cc slammed beetle. On the road finally!!

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    Quote Originally Posted by Ben50n View Post
    Think you need to find where the rev counter takes it pick up off? Possibly a crank or cam sensor? .
    The alternator, IIRC, on diesels.

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    Regular Member MrDerv's Avatar
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    Quote Originally Posted by Big Dave View Post
    The alternator, IIRC, on diesels.
    Nope, Crank sensor

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    Some diesels use the alternator for the rev counter signal though.

    [ame="http://en.wikipedia.org/wiki/Tachometer"]Tachometer - Wikipedia, the free encyclopedia[/ame]

    "In older vehicles, the tachometer is driven by the RMS voltage waves from the low tension (LT) side of the ignition coil, while on others (and nearly all diesel engines, which have no ignition system) engine speed is determined by the frequency from the alternator tachometer output. "

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