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Thread: G450 (076-906-051-A) output signal...0,5 Volt or 1 volts ??

  1. #11
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    Hi Larry Manton

    Thanks for your reply.

    I back probe the sensors output signal back to the ECU
    I don't know why but I can't post attachments. So I hope you can access this link where I shows where to I measured the signal:
    https://drive.google.com/open?id=1Rz...FF0oXrW_auO-l5

    Here is a log from a trip where it can be seen that the sensor is alive:
    https://drive.google.com/open?id=1NW...9mHBmmcwugkYBT

    No, I also do not want to start changing components until the error is corrected. But troubleshooting is difficult when I don't have at known-good.
    But I might have to try a new sensor in this case.

  2. #12
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    Quote Originally Posted by DK_Jonas_Taastrup View Post
    Hi Larry Manton

    Thanks for your reply.

    I back probe the sensors output signal back to the ECU
    I don't know why but I can't post attachments. So I hope you can access this link where I shows where to I measured the signal:
    https://drive.google.com/open?id=1Rz...FF0oXrW_auO-l5

    Here is a log from a trip where it can be seen that the sensor is alive:
    https://drive.google.com/open?id=1NW...9mHBmmcwugkYBT

    No, I also do not want to start changing components until the error is corrected. But troubleshooting is difficult when I don't have at known-good.
    But I might have to try a new sensor in this case.
    Dk, yes was able to open and noted graph, but don't have enough history with DPF as I own a 2015 with, but have not tracked it.

    Note pressure does move up and down with RPM, but as stated, what does a good one look like. In your case would have been nice to see the same data before DPF, but water under the bridge, but sensors is recording pressure changes, so not broken, but how accurate?

    LARIMORE

  3. #13
    Verified VCDS User golfi_vend's Avatar
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    You have difference pressure negative 140 and offset negative 50.

    How's that a correct reading?
    I am a VW Freak - Le WV Freaks OR Come visit me at my work with ODIS concerns - FORSS ODIS GeKo/FaZit access for VW/AUDI/Škoda
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  5. #14
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    Quote Originally Posted by Larry Manton View Post
    Dk, yes was able to open and noted graph, but don't have enough history with DPF as I own a 2015 with, but have not tracked it.

    Note pressure does move up and down with RPM, but as stated, what does a good one look like. In your case would have been nice to see the same data before DPF, but water under the bridge, but sensors is recording pressure changes, so not broken, but how accurate?

    LARIMORE
    Hi Larry Manton

    There is a good question . But as long as it is not in 0 with the engine off, I do not take the measurement for good.

  6. #15
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    Quote Originally Posted by golfi_vend View Post
    You have difference pressure negative 140 and offset negative 50.

    How's that a correct reading?
    Hi golfi_vend

    I think you've seen my problem

    The question is whether it can be true that there should be 1 volt on pin 3 on the G450.
    I can only offset difference pressure (067-3) to 0 when I have 1 volt but my sensor today only provides 0.5 volts. (engine off)
    wrong sensor?
    faulty sensor?
    faulty ECU?
    Something else faulty?

  7. #16
    Verified VCDS User golfi_vend's Avatar
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    Quote Originally Posted by DK_Jonas_Taastrup View Post
    Hi golfi_vend

    I think you've seen my problem

    The question is whether it can be true that there should be 1 volt on pin 3 on the G450.
    I can only offset difference pressure (067-3) to 0 when I have 1 volt but my sensor today only provides 0.5 volts. (engine off)
    wrong sensor?
    faulty sensor?
    faulty ECU?
    Something else faulty?
    You must realise that usually manufacturers don't give such info out. I guess for troubleshoot ODIS GFF has some sort of data input after voltage measurement, but that data can be only seen when following testplan of a car.

    You said that You've checked wires. - How? Are they able to carry current, not just making a resistance test?

    If You want my advice, then just replace the sensor. Yes they are failure, yes you can use oscilloscope to take measures, but in more real life they just fail. And on another note. I know T5 with Bi-Turbo, when we replace engine block because of failure, we also need to replace everything: Lambda Sensor, DPF, temp sensors and diff sensor.
    I am a VW Freak - Le WV Freaks OR Come visit me at my work with ODIS concerns - FORSS ODIS GeKo/FaZit access for VW/AUDI/Škoda
    The world is my oyster...

  8. #17
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    Quote Originally Posted by golfi_vend View Post
    You must realise that usually manufacturers don't give such info out. I guess for troubleshoot ODIS GFF has some sort of data input after voltage measurement, but that data can be only seen when following testplan of a car.

    You said that You've checked wires. - How? Are they able to carry current, not just making a resistance test?

    If You want my advice, then just replace the sensor. Yes they are failure, yes you can use oscilloscope to take measures, but in more real life they just fail. And on another note. I know T5 with Bi-Turbo, when we replace engine block because of failure, we also need to replace everything: Lambda Sensor, DPF, temp sensors and diff sensor.
    Hi golfi_vend

    I back probe the sensors output signal back to the ECU where I have measured 0,5 volt (also resistance test)

    Yes I think I have to follow your advice and buy a new G450 (076-906-051-A)

  9. #18
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    You should verify the wiring is correct too and is very easy with load light with isolated end to end of tracks.
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  10. #19
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    Quote Originally Posted by Jack@European_Parts View Post
    You should verify the wiring is correct too and is very easy with load light with isolated end to end of tracks.
    Hi Jack@European_Parts

    I will double check wiring with load. (It will not be this year anyway I get that sensor)
    If it is a wiring fault the only explanation I can find is that it is a current measurement and half of the current runs another way.

  11. #20
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    Hi

    I just discovered that our Skoda Octavia 1.6 from 2011 has almost the same G450.
    Skoda Octivia = G450 (076-906-051-B)
    Skoda Fabia = G450 (076-906-051-A)

    And when I back probe the Octivia sensors between Pin 1 and Pin 3 there was 1 Volt
    So unless the difference between A and B is 1 volt vs. 0.5 volts, I'm convinced it's my G450 which is defective.

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