Some info for you.
There are 2 types of regeneration, passive and active
During long motorway journeys, passive regeneration will occur. This needs no intervention from the engine control unit. Due to the raised exhaust temperatures on a long journey
(temperatures between 350 and 500°C), the procedure occurs slowly and continuously across the catalytic-coated (with platinum) DPF. The catalytic-coated DPF is situated
close to the Engine, therefore the exhaust gas temperature is high enough (500°C) to ignite the soot particles.
Due to this soot is burned-off and is converted into a smaller amount of ash.
Active ‘regeneration’ is when the ECU intervenes when the soot loading in the DPF is calculated to be 45%. The procedure lasts for about 5 – 10 minutes. Specific measures are taken by
the ECU to raise the engine exhaust temperature to above 600°C, these include switching off the exhaust gas recirculation and increasing the fuel injection period to include a small
injection after the main injection. The soot particles are oxidised at this temperature.
The ECU will trigger a regeneration process, if for some reason this is aborted, ie. customer slows down, stops etc, the process will be resumed when
regeneration conditions are once again met, above 60km/h (38mph). This will continue for 15 minutes.
If after 2 attempts of 15 minutes, a successful regeneration has not been possible, the loading will increase. At 50% soot loading, the ECU will continue to
maintain maximum exhaust temperatures of 600°C to 650°C to cause a regeneration process. The system will try to run a regeneration process for 15
minutes. If unsuccessful, the system will repeat this process for a further 15 minutes, if still unsuccessful, the DPF light on the driver display panel will then be lit.
emergency forced regen
1.4l/1.9l/2.0l R4 & 2.5l R5 PD/PPD-TDI
Prerequisites (General):
Ignition ON
Engine ON (Idle)
Coolant Temperature above 50 °C (see MVB 002.4)
Particle Filter Load below Specification (see MVB 075.3, VAG-COM should give the specified value)
If the Particle Filter Load is above Specification the Particle Filter needs to be replaced since the car may burn down when regenerating.
Power Consumers ON (Light, Seat Heating, Front/Rear Window Heater, Climate Control)
Conditions (Driving Cycle):
Vehicle Speed between 30-60 km/h (18-37 MPH)
Engine Speed between 1500-2500 RPM (4th or 5th Gear, Automatic Transmission in Tiptronic)
Duration approx. 15-20 Minutes
Exhaust Gas Temperature before Turbo Charger above 700 °C
Drive the car based on the above conditions until the Particle Filter Load is as low as possible (close to 0*%). In case the regeneration fails there can either be problems with the Driving Cycle Conditions or with the Engine Hardware.
[Select]
[01 - Engine]
[
Coding-II - 11]
Enable Regeneration by Entering 21295.
[Do It!]
[Meas. Blocks - 08]
Select both Groups at once 070 and 075.
[Go!]
MVB 070.1: Regeneration Status (xxxxxxx1 = Normal Regeneration active, xxxxxx1x = Forced Regeneration active)
MVB 070.3: Regeneration Counter/Timer
MVB 075.1: Exhaust Gas Temperature before Turbo Charger
MVB 075.2: Exhaust Gas Temperature before Particle Filter
MVB 075.3: Particle Filter Load
MVB 075.4: Exhaust Gas Temperature after Particle Filter
Now Start the Driving Cycle and keep watching the Measuring Blocks (2nd Person required).
[Done, Go Back]
[Close Controller, Go Back - 06]
