VCDS Fault - 7397 - Diesel Particle Filter; Differential Pressure Sensor

[DamianW]

Hi,

 

I have a 2011 Skoda Fabia Diesel Manual reporting the following error on VCDS does the DPF need a regen or is this a sensor? If so where is the sensor located

 

Address 01: Engine (J623-CAYA)       Labels:. 03L-906-023-CAY.clb
   Part No SW: 03L 906 023 NH    HW: 03L 906 023 LK
   Component: R4 1.6l TDI   H33 9978  
   Revision: --H33---    Serial number:               
   Coding: 00114016000500080000
   Shop #: WSC 13765 031 00051
   ASAM Dataset: EV_ECM16TDI02103L906023NH 003011
   ROD: EV_ECM16TDI02103L906023LL.rod
   VCID: 79ACE5F2295BD08F1C4-802C

1 Fault Found:
7397 - Diesel Particle Filter; Differential Pressure Sensor 
          P2454 00 [032] - Short to GND
          Intermittent - Not Confirmed - Tested Since Memory Clear
             Freeze Frame:
                    Fault Status: 00000001
                    Fault Priority: 2
                    Fault Frequency: 11
                    Mileage: 92217 km
                    Date: 2017.09.07
                    Time: 17:24:06

                    Engine speed: 793.50 /min
                    Normed load value: 20.0 %
                    Vehicle speed: 0 km/h
                    Coolant temperature: 30 °C
                    Intake air temperature: 19 °C
                    Ambient air pressure: 980 mbar
                    Voltage terminal 30: 14.005 V
                    Unlearning counter according OBD: 30
                    Particle filter: soot mass measured-MASS_SOOT_PHY_PF: 9.05 g
                    Particle filter: soot mass calculated-MASS_SOOT_SIM_PF: 16.26 g
                    Particle filter kilometers since last regeneration_1-DIST_RGN_ENVD_H: 141 km
                    Counter for regeneration time of diesel particle filter-T_INT_RGN_ACT_INI_PF_ENVD_H: 0.0000 s
                    Particle filter: difference pressure-DIP_PF: 0.00 hPa
                    Service regeneration: Release conditions 3-FRF_STATE_RGN: 1
                    Sensor for temp after charge air cooler: raw value-TBA_MES: 19 °C
 

[Rooted]

Are you intending having The Fix carried out?

 

Normally the advice being given is Avoid, but then you do get New Engine Management and a kind of 24 month extended warranty from the VW Group if the car goes in, and just maybe your current issue resolved Free Gratis.

[DamianW]

I am trying to help a colleague at work by using my VCDS I bought for my Superb to see what her Fabia is reporting as an error. 

Right now I am trying to work out if this is a problem with the DPF or if the sensor is at fault. Was hoping for someone with some advice. 

[Breezy_Pete]

Sensor location shown here. 

Doesn't sound like an indication that the DPF just needs a regen, but I could be wrong.

[KeithCheetham]

17 hours ago, DamianW said:

Particle filter: soot mass measured-MASS_SOOT_PHY_PF: 9.05 g
                    Particle filter: soot mass calculated-MASS_SOOT_SIM_PF: 16.26 g
                    Particle filter kilometers since last regeneration_1-DIST_RGN_ENVD_H: 141 km
                    Counter for regeneration time of diesel particle filter-T_INT_RGN_ACT_INI_PF_ENVD_H: 0.0000 s
                    Particle filter: difference pressure-DIP_PF: 0.00 hPa

 

 Think that DPF blockage has its own codes - 008194 - Particulate Trap Bank 1 P2002 - 000 - Efficiency Below Threshold - Intermittent - MIL ON - on our 1.4TDI. The above soot mass appears low looking at info on Ross Tech site - http://wiki.ross-tech.com/wiki/index.php/Diesel_Particle_Filter_Emergency_Regeneration - where 30 to 40 g is mentioned, but differential pressure look low although I am unsure if the value would have been captured while the engine was running which would be the only time a differential would be across the switch. DPF switches are cheap if bought online so may be best starting point.

 I think that there is a calibration process to be done when fitting new switch.

Edited 15 September, 2017 by KeithCheetham

[DamianW]

Thanks Keith for the pointer to RossTech, Seems the soot mass may well be within limits. But you also pointed out the  plain obvious (now that you mention it) that I didn't have the engine running. Will retry the test next week when back in work to see if the same error is reported on a running engine. The sensor is cheap compared to a new DPF so in many ways I hope its that.

[KeithCheetham]

4 hours ago, DamianW said:

But you also pointed out the  plain obvious (now that you mention it) that I didn't have the engine running.

 Just noticed that speed is quoted as 793 rpm and speed 0 km/h, so probably was running when fault logged. There is a way of checking filter loading via loging but I think it may be different to our 1.4 TDI Greenline which is the method on the Ross Tech page that I used which showed 64% before forced regen and 4% after. Do a bit of research as I am unsure if number of forced regens is limited so if a pressure switch problem changing that would remove requirement to regen.