replaced ecm and now code 433

Discussion in 'Trucks [ Eighteen Wheelers ]' started by earthmover, Nov 19, 2009.

  1. earthmover

    earthmover Medium Load Member

    563
    20
    Jan 27, 2009
    castalia , north carolina
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    it was derate and would not run over 50 and 1500 rpm
     
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  3. FYDA FREIGHTLINER CINCY

    FYDA FREIGHTLINER CINCY Light Load Member

    270
    130
    Apr 28, 2009
    Cincinnati, ohio
    0
    and all these other problems started after they replaced ecm
     
  4. vegetto

    vegetto Bobtail Member

    20
    5
    Dec 14, 2006
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    I highly doubt its another ECM. Like the other guy said, look into your parameters to make sure the fan logic is set correctly. It could also be a possible bad solenoid. The speedo problem,to me, sounds like a loose tone wheel on your transmission. This will cause your speedo to jump around, especially at higher vehicle speeds. That 433 code usually isn't caused by an ECM. Usually a short in the sensor or harness is the fault. All the 433 code is, is the ECM is seeing high voltage on the signal wiring of the intake pressure circuit and thinks there is high boost. Other factors says there is not high boost and so ECM sets this code. If the signal wire is shorted to a high source or if the sensor is internally shorted, it will cause this code. In some instances, bad injectors will cause this problem as well. You may notice this as a miss in the engine, or an over fueling injector that will make a horrible fuel knock at high engine rpm's under slight load.
     
  5. earthmover

    earthmover Medium Load Member

    563
    20
    Jan 27, 2009
    castalia , north carolina
    0
    got everything working except the fan is still on going to try and have it looked at (the per.) and see what the dealm is....it worked fine before i took it to the shop......will it hurt the truck if i have to drive it with the fan on all the time???????i will have to be out of work for sometime to come and need to make some money before im out to keep me going...thanks for all the help....oh and the 433 code has been cleared and is not showing up anymore......:biggrin_25512:
     
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