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5.4 DPF
The Diesel Particle Filter (DPF) function manages DPF regeneration, DPF
component replacement teach-in, and DPF teach-in after replacing the engine
control module (ECM).
The ECM monitors driving style and selects a suitable time to employ regeneration.
Vehicles driven a lot at idling speed and low load will attempt to regenerate earlier
than vehicles driven more with higher load and speed. For regeneration to take
place, a prolonged high exhaust temperature must be obtained.
In the event of the car being driven in such ways that regeneration is not possible,
i.e., frequent short journeys, a diagnostic trouble code will eventually be registered
in addition to the DPF light and “Check Engine” indicators displaying. A service
regeneration can be requested in the workshop using the diagnostic tool.
DPF regeneration is used to clear PM (Particulate Matter) from the DPF filter
through continuous combustion oxidation mode (such as high-temperature heating
combustion, fuel additive or catalyst reduce PM ignition combustion) to stabilize
the filter performance.
DPF regeneration may be performed in the following cases:
The exhaust back pressure sensor is replaced.
The PM trap is removed or replaced.
The fuel additive nozzle is removed or replaced.
The catalytic oxidizer is removed or replaced.
The DPF regeneration MIL is on and maintenance is performed.
The DPF regeneration control module is replaced.
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