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  1. #1

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    Camshaft Position Sensor

    My headache of a car is pissing me off again. The car is a 95 Grand Prix with the 3.4 DOHC motor. A few days ago the SES light comes on so I scanned the codes. The only code stored was the camshaft position sensor so I went and replaced it. After replacing it still threw the same code. So I checked the wiring to the sensor everything looks fine. The only thing I can think of is that these motors have two camshaft position sensors or the computer is just fried. Just looking for others oppinoins before I rip out the computer.


    Thanks for any help

  2. #2
    Robby1870's Avatar
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    Camshaft Position Sensor

    The computer will save codes. Did you disconnect the battery, thus resetting the computer after changing the sensor?
    Robby Whitesell
    2006 Pontiac G6 GT - 3500 V6

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  3. #3

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    Camshaft Position Sensor

    First I cleared it with the scanner, but to make sure I cleared it by taking the battery cable off same result wish it was this simple.


    Any more ideas?

  4. #4

    Camshaft Position Sensor

    I can't remember how the cam sensor on your works, but I know many cam sensors work off of a variable reluctance sensor, that is positioned next to a toothed wheel that is on the cam. As best you can, make sure that none of the teeth on that wheel are broken off, you might see one that is bigger than the rest, don't worry about that one, its just the reference tooth. Look for signs of damage. Also make sure that it is faily clean, and find out what the specification is as to what the gap between the sensor and the wheel should be, and make sure that is correct. Other than that its going to be getting into testing the circuits to make sure the sensor is getting a signal from the PCM, or that the PCM is getting a signal from the sensor.
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  5. #5

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    Camshaft Position Sensor

    [quote="jamcneely"]I can't remember how the cam sensor on your works, but I know many cam sensors work off of a variable reluctance sensor, that is positioned next to a toothed wheel that is on the cam.[quote]

    The cam sensors work off a magnetic field generated by a strip of metal inlaid on the cam shaft. As the cam spins the field changes strength and direction which is sensed as induced electrical current in the cam position sensor. So, there shouldn't be any teeth to clean there. Just the same though, since the cam has a built in magnet it does tend to collect fine metal shavings and oily gunk so you may want to make sure that the build up isn't too bad.

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