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Thread: 2002 S54 code 230

  1. #1
    Join Date
    Jul 2010
    Location
    KC, Mo
    Posts
    4,724
    My Cars
    1997 328is

    2002 S54 code 230

    I have a 2002 S54 transplanted into a 2001 E46 325i Touring. All has been well for a while (700+ miles) but I am starting to lean on the gas pedal a bit. Short story, if the throttle pedal is held at less than a 52% open position, no problems. If I hold the pedal at an indicated 52% or more, after 5-8 seconds, the reading drops to ZERO and the 230 code pops up.

    Thoughts?

  2. #2
    Join Date
    May 2009
    Location
    Pittsburgh, PA
    Posts
    2,156
    My Cars
    S54/E36,18 Sierra Denali
    Throttle position sensors, 3 total.

    1 at the front of throttle body assembly, 1 on the actuator and the third is in the pedal. Test resistance across pins 1&3 on each sensor. It should be 1-5v linear across the range.

    The bad one will give a different value than the others

  3. #3
    Join Date
    Jul 2010
    Location
    KC, Mo
    Posts
    4,724
    My Cars
    1997 328is
    I appreciate the suggestion. However, the resistance readings will not produce voltage values. That said, I have already solved the issue. Apparently I caused it. When the engine was almost completely overhauled before being swapped into a 2001 E46 Touring, I used non-stock boot clamps on the intake boots at the injector side. Apparently one of them slipped out of place (OOPS!!) and was interfering with the movement of the buttery shaft. If this had been a mechanical throttle system vs fly by wire, I would have actually FELT the problem at the pedal. As it is, the DME was seeing anomalies in the signals from the three TPS and POOF -- limp mode.

  4. #4
    Join Date
    May 2009
    Location
    Pittsburgh, PA
    Posts
    2,156
    My Cars
    S54/E36,18 Sierra Denali
    ah sorry they’re 5v signal then I believe. But you can test them individually. Good it’s solved.

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