When a DPF reaches a pre- determined particulate matter (PM) fill level (around 40%), the ECU will activate the regeneration process, which can inject up to eight times more fuel per stroke – a rate which is needed to produce temperatures in excess of 550°C dry or 450°C with the passive system (fuel additive Eolys), so that it can incinerate the PM that has been captured within the DPF.
The regeneration process will not reach a conclusion if:
•The engine management light is illuminated for any fault
•There is less than 20L of fuel in the fuel tank or if the fuel light is on
•The pressure sensors are not working correctly
•The pressure sensor pipes are damaged – check for degradation under heat shielding
•The EGR system is not working correctly
•The engine oil is the incorrect specification for the vehicle – must be Low Ash grade. Check the engine oil for diesel contamination (could be the result of regeneration)
•The fuel additive, Eolys, level is too low
In order to carry out a forced DPF regeneration, the correct diagnostic or reset tool must be used. This operation could take up to 30 minutes. Ensure the regeneration process is conducted in a safe environment as exhaust temperatures will be very high.
If the DPF is not regenerated and the PM level fills to over 90% or 45g, the DPF will need replacing. This is not covered under warranty. When fitting a new DPF, the ECU must be reset before completing a forced regeneration. This is to ensure that the ECU knows that the DPF and all related sensors are reset to empty.
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