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Thread: vectra c 52 1.8 cam sensor testing?

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    Vehicle : Vectra c

    Trim : Ls

    Engine : 1.8

    Year : 52

    Default vectra c 52 1.8 cam sensor testing?

    hi,
    if i unplug the cam sensor it dosent change the idle.
    i want to test it, it is hall effect and therfore 3 wire.
    the plug from the ecu with ign on but not running has +5v on both outer terminals and the center is ground? is this right i would of expected a pos a neg and a sensor wire?
    thanks
    barks

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    Vehicle : Vectra c

    Trim : Ls

    Engine : 1.8

    Year : 52

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    right, tracing the wires i got
    1 - sensor
    2- earth
    3 - +5v

    im getting a fixed 2.5v on pin 1 whilst eng is idling? this isnt right is it?

    thanks

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    Trim : Ls

    Engine : 1.8

    Year : 52

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    anyone?? before i have to buy one??

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    Year : 52

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    just noticed i i unplug the crank sensor it dosent change either?
    thanks

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    Regular Member rich r's Avatar
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    What are you measuring it with, a voltmeter? It's a steady stream of pulses, one for every rotation of the camshaft. You'll need an oscilloscope to see them, as there will be about 5 pulses a second at idle (camshaft turns once for every two crankshaft rotations). All you'll see with a voltmeter is an average value - ie 2.5V.

    If you're getting cam sensor failure codes (and 4000rpm rev limit), then replace the sensor with a genuine GM one. I spent months having the garage I bought the car from mucking about trying to cure that error, until I threatened to ask for a refund and they fitted a genuine sensor rather than a pattern part. The problem went away and hasn't come back in over 30,000 miles.

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    Engine : 1.8

    Year : 52

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    Quote Originally Posted by rich r View Post
    What are you measuring it with, a voltmeter? It's a steady stream of pulses, one for every rotation of the camshaft. You'll need an oscilloscope to see them, as there will be about 5 pulses a second at idle (camshaft turns once for every two crankshaft rotations). All you'll see with a voltmeter is an average value - ie 2.5V.

    If you're getting cam sensor failure codes (and 4000rpm rev limit), then replace the sensor with a genuine GM one. I spent months having the garage I bought the car from mucking about trying to cure that error, until I threatened to ask for a refund and they fitted a genuine sensor rather than a pattern part. The problem went away and hasn't come back in over 30,000 miles.
    thanks rich,
    the wire was all broke and bare so ive replaced it and its the same, i bought the crank sensor too but it just fell apart in my hands whilst fitting it!!!
    the end of it being a small black disk is now inside! does anyone think this small plastic disc will cause a problem if left in or do i get it out?
    thanks

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    Regular Member triple595's Avatar
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    Symptoms of my cam sensor failing was when it gets hot it would go into limp home mode and eventually not start cost me 100 quid to fix at local dealer

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