by Mr Juggles » Sun Dec 06, 2015 11:26 am
Hi Guys, been lurking for some time, so thought I'd put my 2p in....
Not sure if it should work in the same way, but I have a BMW 530d that goes through Regen, pretty much in the same way as others are writing, but a few details left out.
There's no real way of telling if the vehicle is going into Regen, unless you have a code reader plugged in. I have one for the BMW, and it shows real time data as it's happening, so you can maintain the revs required to complete the cycle.
With the BMW, you need to maintain for at least 11 minutes (could be more) above 2000 rpm to complete the cycle. If you drop below this and stop, the cycle can end, and you have to wait till the next cycle to unblock the DPF
Also, if, for any reason you have a fault code, for example, a glow plug fault.....the engine will not regen until cleared. With the real time data on the BM reader, you can see when the temp starts to rise indicating a regen. The normal running temp at the DPF prior to regen is around 350 degrees, this starts to climb sharply to around 450 - 500 when starting to regen, if you have a code, it will stay there or abort the procedure....no faults....continues to rise up to a max 620 degrees, burns out the soot, and could blow it out the back to poor matey behind on the motorway.
You can scan for codes before hand, if there is one, it can be cleared and the regen will kick in. The glow plugs are needed as part of the regen....technically I don't know why, not all of them, but if the car computer detects a fault on any of them, it locks out the regen procedure.
There are other factors to consider also which can stop a regen. The engine stat, if its knackered, and remains open, will not let the engine get up to temp, and will lock out the process. This is more of a data reading process at the time rather than fault clearing. The running temp should be around 90 degrees. When stuck open, runs constant around 78. The process will not kick in. Stats need to be changed. Without a plug in reader you wouldn't know....until you get a blocked DPF.
I know I have based the above on the BMW, but the DPF cycle on a different vehicle cant be that different if it is trying to do the same thing?
Best thing...get yourself a cheap plug in reader/fault clear and see everything going on.
I hope the above helps.
Joe.