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Skoda Octavia 1.6 BFQ without LPG - Check engine error and EPC

kubas10 7554 17
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  • #1
    kubas10
    Level 25  
    Hello, I've been fighting with skoda for a long time. Once in a while after starting the engine or while driving, EPC appears and the power drops. Errors:

    17950 throttle positioner potentiometer - abnormal signal;
    17698 coolant temperature sensor at radiator outlet - signal too high;
    17987 throttle control unit - incorrect adaptation;
    17953 throttle control - malfunction;
    17973 throttle control unit - lower limit not reached;
    16486 air mass meter - signal too low;
    17579 throttle positioner potentiometer 2 - abnormal signal;
    17851 sensor for exhaust gas recirculation - signal too low;
    17811 exhaust gas recirculation system - control deviation between setpoint and actual value;

    Within a few months, the following were exchanged:

    EGR, coil + candles and wires, flow meter, throttle + adaptation, ignition block, battery and main relay (original).

    It seems to me that the problem appears in the joint supply of these elements, but I have already run out of ideas. Sometimes it returns the error "main relay malfunction" - even after replacing with a new original.

    What to do with it?
  • #2
    sulof1601
    Level 26  
    Hello. It is necessary to check the power supply and ground of the motor controller.
  • #3
    kubas10
    Level 25  
    Is there a common throttle, EGR, flowmeter and radiator outlet power supply?
  • #4
    sulof1601
    Level 26  
    There is no common power supply, EGR has one except the controller from the relay and the flow meter also has power from another relay but the rest of the wires go directly to or from the engine controller. These after the relay have 12V and the others are either 5V or ground or signal.
  • #5
    kubas10
    Level 25  
    Yesterday I deleted all the errors and rode and it was ok, today after starting the engine the check lit and only one error:

    17851 sensor for exhaust gas recirculation - signal too low;

    Or maybe one of the executive elements causes the above failures? eg EGR come on exchanged ...
  • #6
    matimon22
    Level 25  
    Have you looked into the ECU plugins and itself? Maybe it's "green" ...
  • #7
    kubas10
    Level 25  
    I opened the driver and it's ok.
  • #8
    sulof1601
    Level 26  
    Each controller after opening is ok. Check the basic parameters do not follow the error codes. You also have the function of reading the controller voltage you can check, measuring blocks; flow?, EGR?, Damper? .............. .more data is needed.
  • #9
    kubas10
    Level 25  
    I would need a motor diagram because I was just out of hgs-data license and I don't have it by the end of the month. How to read driver voltages?
  • #10
    grala1
    VAG group specialist
    Measuring blocks.
    There will also be a signal from EGR.
    Has the EGR valve been adapted?
    Check installation between EGR and ECU.
  • #12
    kubas10
    Level 25  
    grala1 wrote:
    Has the EGR valve been adapted?


    Yes, after replacing the EGR I did the adaptation, before replacing it during light acceleration the engine tugged.

    Added after 37 [seconds]:

    sulof1601 wrote:
    Engine diagram ??????


    What's so special about it is that you used so many question marks?

    Added after 9 [minutes]:

    grala1 wrote:
    Measuring blocks.
    There will also be a signal from EGR.
    Has the EGR valve been adapted?
    Check installation between EGR and ECU.


    What about the rest of the errors? The throttle also shows that from time to time there is no voltage, on the flow meter ...
  • #13
    sulof1601
    Level 26  
    Mmm sorry I pressed it so much ..... and why do you need a motor diagram? Which power supply is lost? Is there no signal or 12V? What about the flow meter? Also the signal is lost?
  • #14
    kubas10
    Level 25  
    I would like to check under load all the "pros" and "masses" because the fault with me is probably the lack of some power supply at the ECU. The EGR, damper, and flow meter cannot be damaged at once!
  • #15
    sulof1601
    Level 26  
    Of course not. Enter your driver model and add a pin out and you should find all power and grounding.
  • #16
    kubas10
    Level 25  
    I don't understand ..., skoda data is octavia I estate, 1.6 BFQ, siemens driver.
  • #18
    kubas10
    Level 25  
    The problem was the worn beam under the battery.