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Thread: E60 525d-Probleme "Electric Throttle Valve Actuator"

  1. #1

    Exclamation E60 525d-Probleme "Electric Throttle Valve Actuator"

    Salut, stie cineva ce efect are nefuntionarea clapetei de acceleratie (Electric Throttle Actuator)? Este vorba de piesa nr. 3 de la un 525d E60

    Am aceasta eroare de ceva vreme, dar nu simt niciun efect asupra functionarii masinii: porneste perfect la orice temp, relanti ok, accelereaza ca din "tun", viteza maxima ok (250km/h), consum ok,etc.
    Peste tot am gasit explicatii despre cu functioneaza dar nicaieri rolul lui, decat pareri : ca pt reducerea poluari, dsc, etc, dar nimeni nu este sigur...


  2. #2


    nu stiu ce rol are clapeta aia
    insa stiu ca uneori poate fi vorba de o "citire" gresita a simptomului.
    voiam sa zic ca poate clapeta merge si eroarea apare "din eroare"
    zic si eu!

  3. #3


    Quote Originally Posted by cinciar View Post
    nu stiu ce rol are clapeta aia
    insa stiu ca uneori poate fi vorba de o "citire" gresita a simptomului.
    voiam sa zic ca poate clapeta merge si eroarea apare "din eroare"
    zic si eu!
    Nu este nici asta. De fiecare data cand pui contact sistemul face un "test" adica inchide si deschide clapeta. La mine nu se misca deloc. Clapera se poate vedea daca dai capacul de la motor jos si este chiar in fata EGR. Ceea ce se vede este un arc in forma de "melc". Acesta tine clapeta mereu deschisa si in mod normal, ar trebui ca in anumite circumstante motorasul electric sa o deschida la un anumit unghi. Intre timp am gasit un site care explica rolul acestei piese.

    The electronic throttle control also is involved in various controls including:

    •Engine idle speed control
    •Cruse control
    •Traction control

    Learning Function of Electric Throttle Valve Actuator
    It is necessary to adapt the engine control unit and throttle valve in order to compensate for component tolerances. For this purpose, the emergency air setting (position of deactivated throttle valve) and the lower mechanical stop (throttle fully closed) are learnt independently in predefined test.

    The return spring is also checked. Its task is to close the throttle valve in the event of fault.


    The following conditions must be fulfilled in order to be able to carry out the adaptation:

    Battery voltage > 10 V

    Engine speed < 32 rpm

    Vehicle speed < 2 km/h

    Intake air temperature > -10 °C

    Engine temperature > -10 °C, < 142 °C

    In addition, there must be no fault in the throttle potentiometer.

    Adaptation procedure

    The position of the throttle valve with no power applied is checked every time the ignition is turned to position 2. The throttle valve must be set at the emergency air setting in this position. At the emergency air setting the spring force keeps the throttle valve open by a defined gap in order to maintain sufficient air for emergency engine operation when the valve is switched off. A fault code is entered if the measured emergency air setting is outside the permissible range.

    By opening the throttle valve and then switching it off, it is possible to check whether the return spring can return the throttle valve to the emergency air setting. There is also a defined fault code for this setting.

    The lower mechanical stop must also be learned in order to prevent the valve moving against it during operation. A fault code is also entered if the measured lower mechanical stop is outside the permissible range.

    If the conditions for adaptation are not fulfilled but adaptation was already carried out once successfully the adaptation procedure will be simply terminated without a fault code being entered. The values of the adaptation previously performed will apply.

    If the conditions for adaptation are not fulfilled and adaptation has not yet been carried out successfully (e.g. replacement of engine control unit or throttle valve), the adaptation procedure will be terminated with corresponding fault code entry.

    In all fault cases, only emergency operation of the engine is permitted as reliable operation of the throttle valve is not ensured.

    Electric Throttle Valve Actuator
    The corresponding position of the throttle valve is calculated in the engine control unit from the position of the accelerator pedal and other variables. The throttle valve is opened and closed electrically by the engine control unit.


    Two potentiometers register the current position of the throttle valve. The engine management controls the position by means of the electric drive until the current valve opening corresponds to the set position. Two potentiometers are used for safety reasons. The characteristic curves of the two potentiometers are contra-rotating. The engine control unit powers both potentiometers with an exact voltage of 5 V. This voltage source is also used to supply sensor 1 of the pedal position sensor or accelerator pedal module.

    Throttle-valve potentiometer characteristics

    •Sensor angle

    •Output voltage

    •Signal path of throttle-valve potentiometer 1

    •Signal path of throttle-valve potentiometer 2

    Monitoring the signal voltages

    The engine control unit permanently monitors the two voltages of the potentiometers. The monitoring function checks whether the two signal voltages are within the permissible range and are plausuble in relation to one another. It also monitors whether there is a short circuit. The engine control unit can determine which of the two signal voltages is faultless based on the air mass signal.

    If the engine control unit detects that the signal voltage of a potentiometer is defective, the maximum possible valve opening is limited to 20 degrees.

    If the signal voltages of both potentiometers are detected as implausible, the activation of the throttle valve is switched off. Under these circumstances, it is no longer possible to determine the current position of the throttle valve and, consequently, the return spring closes the throttle valve.

    Monitoring the throttle valve position

    The engine control unit continuously checks whether the actual position corresponds to the set position of the throttle valve. thus making it possible to determine when a valve is sticking. In the case of fault, for safety reasons, the maximum possible engine speed is limited to 1300 rpm.

    A stiff throttle valve that therefore moves only slowly is switched off and closed by the return spring. In this case, the maximum possible engine speed is limited to 1300 rpm by cutting out the fuel injection.

    In alte dezordine de idei, am gasit un site in care sunt tate manualele de reparatii si schemele pt toate bmw-urile

    Drum intins si daca aflati ceva de problema mea nu ezitati sa scrieti...:-)

  4. #4


    Ma predau. E clar ca stii mai bine chestia asta.

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