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Thread: Do I need to adapt a DPF pressure sensor for a 2016 Tiguan?

  1. #21
    Benevolent Dictator Uwe's Avatar
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    Right, there doesn't appear to be any provision for adapting a new differential pressure sensor in this ECU. I'm not sure why such a thing was ever necessary to begin with, since the ECU should be able to do this automatically with key-on, engine off, when there intrinsically cannot be a pressure difference across the DPF.

    Assuming the OP has cleared the faults in the ECU after installing a new differential pressure sensor, and those faults have returned since then, my gut tells me they are more likely due to an electrical problem than anything else. Check/verify all wiring and connectors relevant to this sensor, including wiggle and load tests.

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  2. #22
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    Quote Originally Posted by Jack@European_Parts View Post
    Won't RTFB tell you this?

    http://wiki.ross-tech.com/wiki/index...ir_Information


    JPPSG = https://forums.ross-tech.com/showthr...uot-JPPSG-quot

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    Hi,

    I completely agree with your motto of teach a man to fish and I appreciate your insight. I will subscribe to erwin and download the repair manual so I have that specific information. I will pick up a pressure tester and see what I come up with.

    I will also try doing the adaptation that Dana mentioned. I figured the G450 sensor was for older vehicles because G450 doesnt appear anywhere on the sensor, but my guess G450 has another meaning.

    When I have some results or lack of results I will post back here.

    Thanks for the direction.

    Paul

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  4. #23
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    Quote Originally Posted by Uwe View Post
    Right, there doesn't appear to be any provision for adapting a new differential pressure sensor in this ECU. I'm not sure why such a thing was ever necessary to begin with, since the ECU should be able to do this automatically with key-on, engine off, when there intrinsically cannot be a pressure difference across the DPF.

    Assuming the OP has cleared the faults in the ECU after installing a new differential pressure sensor, and those faults have returned since then, my gut tells me they are more likely due to an electrical problem than anything else. Check/verify all wiring and connectors relevant to this sensor, including wiggle and load tests.

    -Uwe-
    I did clear the faults after i installed the sensor. The only wiring I have checked so far was the wiring going directly to the sensor which read 4.9 volts.

  5. #24
    NostraJackAss Jack@European_Parts's Avatar
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  7. #25
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    So I figured out the issue and yes it makes me feel like an idiot, but the results do confirm a specific suspicion ihad regarding the pressure readings I was seeing from the sensor. I will post the before and after readings. But I thought it was odd that I was seeing negative pressure readings coming from the sensor.
    So here is what I did wrong. When I installed the sensor I installed the hoses to the wrong ports on the sensor, so it was obviously seeing very incorrect information, which would explain why i was getting the erratic/intermittent reading on the sensor and a sensor fault. I had a feeling that the negative pressure I was seeing was some sort of sign that the sensor was receiving incorrect data. That is why I double checked the hose routing. On this sensor the hose diameter is the same, so it is possible to mix them up, but I also noticed that where the metal line and the rubber line connect, there is an indent where the metal line should rest. This line had a mark on it where it rested before and I noticed the mark on the metal line was not exactly in the same spot as before, maybe 2 or 3mm back. So this again made me think.
    Anyway long story short. I switched the hoses and after a 25 minute drive, no MIL, no codes. So I think the issue has been resolved.

    Below are the original readings I had of the pressures, which showed a negative reading. And then the new readings that show positive hPa numbers, which makes more sense to me. So I guess it is a good idea to look at those numbers to see if something looks off.

    Thanks to everyone who passed their knowledge on and despite me figuring the issue out, i learned more about ways to diagnose some DPF issues.

    Paul

    Before -
    Address 01: Engine (04L 906 026 JC)

    17:53:50
    IDE00434 Particle filter: soot mass calculated 11.94 g
    IDE00435 Particle filter: soot mass measured 0.11 g
    IDE11896 Particle filter: differential press. sens.1 bank 1: raw value 1 -16 hPa
    IDE11897 Particle filter: differential press. sens.1 bank 1: raw value 2 20 hPa

    __________________________________________________ __________________________________
    After-
    VIN: WVGZZZ5NZHW807260 License Plate:
    Mileage: 114431km-71104mi Repair Order:


    Address 01: Engine (04L 906 026 JC)

    08:31:07
    IDE00434 Particle filter: soot mass calculated 6.41 g
    IDE00435 Particle filter: soot mass measured -0.65 g
    IDE11896 Particle filter: differential press. sens.1 bank 1: raw value 1 44 hPa
    IDE11897 Particle filter: differential press. sens.1 bank 1: raw value 2 10 hPa
    Last edited by elqwan; 07-03-2020 at 03:08 AM.

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