crankshaft position sensor error?

Discussion in 'General Motoring' started by Hackamore, Nov 3, 2009.

  1. Hackamore

    Hackamore Guest


    having some hard starting and it finally popped up a code.

    "crankshaft position sensor error"...

    what are the likely fixes?
    Hackamore, Nov 3, 2009
  2. Hackamore

    Oppie Guest

    I had an intermittent crank angle sensor on my LW300 that was making me
    crazy. It didn't throw a code but caused a few backfires that killed two MAP
    sensors. No codes were thrown except lean bank 1 and lean bank 2. Both were
    a result of a damaged MAP. We finally figured out that when the engine died,
    fuel pump wasn't running. Fuel pump is supposed to run for about two seconds
    on key on and then continue while cranking while crank sensor pulses sensed.
    In my case pump came on at key on but not during cranking. I finally told
    Saturn to just change the sensor since they could not duplicate the
    failures. I got stuck on the road twice. Cost about $200 and has not been a
    problem in the last 2 years.

    Crank sensor is a magnetic sensor that senses gear teeth on the crankshaft.
    There are 36 equally spaced teeth with one tooth missing. The missing tooth
    corresponds to top dead center which the computer detects and is used to set
    all the engine timing. The crank sensor is the main timing element in the
    engine management system and coordinates timing of fuel injection and spark.

    In my case the coil was intermittently open. In other cases, gap between the
    sensor or internal magnetic strength may be off. I don't recall that there
    is any adjustment allowed, only replacement. Before you do replace the
    sensor, check that the electrical circuit is intact. That is that the wiring
    is not abraded or the connectors oxidized.

    Oppie, Nov 6, 2009
  3. Hackamore

    Hackamore Guest


    that would make sense... once I get it some gas it runs fine.

    I'll check connections first... a free fix is always good.

    but is it difficult to replace the crank sensor? if it's not sending the
    signal to turn on the fuel pump it'll do exactly what mine's doing...
    then when it finally flips on it runs fine.

    the O2 sensor in front was a breeze.

    Hackamore, Nov 11, 2009
  4. Hackamore

    Oppie Guest

    I don't recall that the crank angle sensor is too hard to replace. I
    normally do these things myself but that week my son was getting married two
    states away and after getting stuck on the side of the road twice, I wasn't
    taking any chances on missing the nuptials. Left the car with Saturn to deal
    with and got a rental. Sorted things out with Saturn the following week.

    iirc the crank sensor is on the passenger side of the engine block near the
    front and just above the oil pan.

    '01 lw300
    Oppie, Nov 12, 2009
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