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I had the chance to use the ross tech VCDS to look at a 2009 JSW jetta sportwagen the other day and found the following info. I'll write this into a FAQ when I have the time and add the link here. If the pics disappear, refer to the FAQ.
Edit: please refer to the FAQ article for more details: http://www.myturbodiesel.com/1000q/DPF-Adblue-FAQ-VW-Audi.htm
The difference between the 2009 and 2010 4 cylinder TDIs and earlier ones is the complex EGR and exhaust treatment system. Every once in a while, the diesel particulate filter does an active regen cycle by injecting fuel after the main combustion, which heats up the DPF and burns up accumulated soot. This uses a little fuel and increases backpressure. To make up for it, the engine computer increases turbo boost slightly during this which will increase engine power and responsiveness. During sustained highway acceleration or other instances with high exhaust gas temperatures EGT, the DPF is under passive regen burning up soot because it's hot. This doesn't use any fuel because the engine isn't injecting any extra fuel.
Unlike earlier exhaust systems which had the gasses pass through a honeycomb-like filter, the DPF actually blocks the gasses to trap the soot. The filter has no spot where gasses flow through holes, gasses have to pass through the filter to go out the exhaust pipe. How clogged the filter is is one factor in how it determines when to do an active regen.
Symptoms of the car doing an active regen are hearing the extra radiator fan coming on and a burning rubbery odor by the exhaust. This can occur at stoplights or when you stop the car (while it's in the middle of a self clean cycle)
You can manually start a regen cycle using a VCDS. Go into adaptation, enter the security code 12233, and go for a highway drive. Change channel 18 from 0 to 1 and save. A yellow indicator light for the DPF will come on and the MFD mulfunction display will show a message.
Some things I noticed during an active DPF:
You will see soot load calculated, measured, and miles since last regen.
After a few minutes calculated and measured soot load went down.
After it was done, miles since last regen also went to zero.
.
Edit: please refer to the FAQ article for more details: http://www.myturbodiesel.com/1000q/DPF-Adblue-FAQ-VW-Audi.htm
The difference between the 2009 and 2010 4 cylinder TDIs and earlier ones is the complex EGR and exhaust treatment system. Every once in a while, the diesel particulate filter does an active regen cycle by injecting fuel after the main combustion, which heats up the DPF and burns up accumulated soot. This uses a little fuel and increases backpressure. To make up for it, the engine computer increases turbo boost slightly during this which will increase engine power and responsiveness. During sustained highway acceleration or other instances with high exhaust gas temperatures EGT, the DPF is under passive regen burning up soot because it's hot. This doesn't use any fuel because the engine isn't injecting any extra fuel.
Unlike earlier exhaust systems which had the gasses pass through a honeycomb-like filter, the DPF actually blocks the gasses to trap the soot. The filter has no spot where gasses flow through holes, gasses have to pass through the filter to go out the exhaust pipe. How clogged the filter is is one factor in how it determines when to do an active regen.
Symptoms of the car doing an active regen are hearing the extra radiator fan coming on and a burning rubbery odor by the exhaust. This can occur at stoplights or when you stop the car (while it's in the middle of a self clean cycle)
You can manually start a regen cycle using a VCDS. Go into adaptation, enter the security code 12233, and go for a highway drive. Change channel 18 from 0 to 1 and save. A yellow indicator light for the DPF will come on and the MFD mulfunction display will show a message.
Some things I noticed during an active DPF:
You will see soot load calculated, measured, and miles since last regen.
After a few minutes calculated and measured soot load went down.
After it was done, miles since last regen also went to zero.
.