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Thread: p1909 Particulate filter pressure sensor pressure not plausible with barometric pressure

  1. #1
    Regular Member Swedge's Avatar
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    Default p1909 Particulate filter pressure sensor pressure not plausible with barometric pressure

    as above, got this error

    ive removed the 2 hoses from the dpf no blockages or splits

    what is the sensor called where the 2 pipes go to?

    ive copied this is the sensor in the list?

    Battery Voltage,12.5 V
    Ignition Status,On 12V
    Starter Relay,Inactive
    Fuel Pump Relay,Inactive
    APP at Idle Position (Accelerator Pedal Position),Active
    APP Sensor 1 (Accelerator Pedal Position),0.96 V
    APP Sensor 2 (Accelerator Pedal Position),0.47 V
    Calculated Pedal Position,0 %
    Desired Engine Idle Speed,850 RPM
    Engine Speed,0 RPM
    Camshaft Speed,0 RPM
    Idle Speed Modified,No
    Calculated Air Flow,0 kg/h
    Mass Air Flow Sensor,3 kg/h
    Ambient Temperature,24 C
    Charge Air Temperature,70 C
    Charge Air Temperature,1.31 V
    Coolant Temperature,73 C
    Coolant Temperature,1.66 C
    Oil Level,Normal
    Oil Pressure,Underpressure
    Engine Oil Level Status,Okay
    B1S1 Exhaust Gas Temperature (Bank 1 Sensor 1),52 C
    B1S1 Exhaust Gas Temperature (Bank 1 Sensor 1),0.9 V
    B1S2 Exhaust Gas Temperature (Bank 1 Sensor 2),32 C
    B1S2 Exhaust Gas Temperature (Bank 1 Sensor 2),0.9 V
    Barometric Pressure,98 kPa
    Barometric Pressure,3.89 V
    Boost Pressure Command,104 kPa
    Boost Pressure,97 kPa
    Boost Pressure,1.56 V
    Pulse Ratio Boost Pressure Solenoid Valve,75 %
    EGR Position Commanded (Exhaust Gas Recirculation),100 %
    EGR Pulse Ratio (Exhaust Gas Recirculation),4 %
    Swirl Level Control Solenoid Valve Pulse Ratio,5 %
    Throttle Position PWM Servo Signal,5 %
    Desired Common Rail Fuel Pressure,30.00 MPa
    Common Rail Fuel Pressure,0.43 MPa
    Common Rail Fuel Pressure,0.49 V
    Rail Pressure Control Solenoid Valve PWM,11 %
    Rail Pressure Control Solenoid Valve Current,0.17 a
    Fuel Metering Solenoid Valve PWM,15 %
    Fuel Metering Solenoid Valve Current,0.39 a
    Fuel Temperature,41 C
    Fuel Temperature,2.36 V
    A/C Information Switch,Not Programmed
    A/C Cutoff Mode (Air Conditioning),Not Programmed
    A/C Pressure (Air Conditioning),120 kPa
    A/C Pressure (Air Conditioning),0.3 V
    A/C Relay (Air Conditioning),Not Programmed
    Brake Switch 1,Inactive
    Brake Switch 2,Inactive
    Clutch Switch,Active
    Vehicle Speed,0 km/h
    Vehicle Speed in Cruise Control Range,Inactive
    Vehicle Acceleration,0.0 m/s2
    Cruise Control Tip Switch,Inactive
    Cruise Control,Inactive
    Engine Torque,-30 Nm
    Torque Control,Inactive
    Requested Torque (Traction Control),0 Nm
    Remaining Oil Life,0 %
    Engine Oil Change Warning,Active
    Malfunction Indicator (MI),On
    Service Vehicle Soon (SVS) Indicator,On
    Glow Time Relay,Inactive 12V
    Glow Time Telltale,Off 12V
    Diagnosis Glow Time Relay,Inactive
    Main Injection Timing,0.0 CA
    Final Fuel Injection Amount,0.0 mm3/stk
    Differential Pressure Diesel Particulate Filter,96 kPa
    Differential Pressure Diesel Particulate Filter,4.84 V
    Diesel Particulate Filter Saturation,100 %
    Dist. Since Last DPF Regeneration (Distance),55 km
    DPF Regeneration,0 %
    Odometer Value,263.376 km
    Tank Sensor,2.38 V
    Fan Control 1,Inactive
    Fan Control 2,Inactive
    Fan Control 3,Inactive


    thanks, i need to do a regen as my saturation is at 100% but i cant due to this fault

    thanks

  2. #2
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    "Differential Pressure Diesel Particulate Filter" in your list. This sensor measures the difference in pressure before and after the DPF and expects to see a greater pressure before the DPF due to the restriction the filter causes. From what your readings say, the pressure before the DPF is reading 96kPa but 98kPa at barometric pressure, i.e. after the DPF, and so is implausable. So, chances are your differential pressure sensor isn't working correctly or you have a leak in your pre-DPF hose.

  3. #3
    Regular Member Swedge's Avatar
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    well theres no leaks on the hoses as ive had them off and checked

    so a new sensor?

  4. #4
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    Not sure what car you have, but on the Vectra 1.9cdti 120 (Estate, hence DPF), the differential pressure sensor is mounted on the bulkhead - to the right of the fuel filter as you look in from the front. It's a small black box with 2 hoses (the pre and post DPF hoses) attached to the underside. If you have a different car, just follow the hoses back from the DPF itself.
    Anyway, you can't get more pressure after than before the DPF. You say you've checked the hoses - are the metal pipes that the hoses connect to on the DPF itself clear? Also, the DPF hoses connect to solid pipes and back to hoses again and then to the sensor (at least on the Vectra Est.) and have you checked all of those?
    Lastly, try disconnecting the post-DPF hose from the sensor, temporarily. This means you are definitely getting atmospheric pressure to this side of the sensor. If the pre-DPF is still reading lower, then the sensor sounds like it needs replacing.

  5. #5
    Admin plasma's Avatar
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    Vehicle : Vectra

    Trim : SRi

    Engine : 150

    Year : 05

    Mileage : 74000

    Default

    Differential Pressure Diesel Particulate Filter,96 kPa
    Differential Pressure Diesel Particulate Filter,4.84 V
    Diesel Particulate Filter Saturation,100 %
    Dist. Since Last DPF Regeneration (Distance),55 km

    this bit seems wrong to me...

    if you've regen'd only 55km ago i'd expect the pressure to be about 4kpa... when my regen is complete it reads -2kpa and then gradually increases until the next regen, if it gets too high it flags up a fault code.
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    Aah, ok, have I misunderstood the numbers Plasma? Is the differential pressure sensor reading the actual differential across the sensor, rather than an absolute measurement - i.e. the pre-DPF pressure is 96kPa above that of the post-DPF? Why would this come up as "implausable" - sounds plausibly blocked!

  7. #7
    Admin plasma's Avatar
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    Vehicle : Vectra

    Trim : SRi

    Engine : 150

    Year : 05

    Mileage : 74000

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    i'll see if i can pull the readings from mine tomorrow as a comparision, mine tried a regen the other day buy had to cancel it halfway through..
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    Thinking about it, how does yours read -2kPa Plasma? This sounds wrong too as you should have more pressure pre-DPF, unless it's an accepted error in the DPF sensor. Maybe Swedge's reader is reading absolute pressure after all, and his is reading -2kPa (96-98kPa), but chucking up an error.
    Hmm, I must get a reader on mine!

  9. #9
    Regular Member Swedge's Avatar
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    Yeah I noticed it said my last regen was 55km ago I drove 88 miles back from where I bout the car do going by the 55k it would have done it while driving back but it's still at 100%

    I have a new sensor on its way to me I'll try disconnecting the post pipe and get more readings, I do have some live date in a .csv file if someone wants a look I can email you it

  10. #10
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    Vehicle : vectra c 1.9cdti 120 estate

    Trim : design



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    Quote Originally Posted by plasma View Post
    i'll see if i can pull the readings from mine tomorrow as a comparision, mine tried a regen the other day buy had to cancel it halfway through..
    Sorry to sidetrack - but I have often wondered what happens if you have to turn your engine off while it is mid regen or if you are travelling on a fast road and it starts a regen and then you drive onto minor roads at a much slower speed/engine revs

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