Consensus DPF or DEF

[gtwitch]

AH641D, Where do I find out how to make the truck go into regen?? I let the truck Fast idle for over 30 min and the message said that the DPF just got closer to going into limp mode and finally 2 days later it did go into limp. That being said, it was 8*-28*F outside and the radiator was mostly covered at the time of the 30 min fast idle test. The local dealer could not help and their tech is pretty knowlegable. I really need to know how to find the reading information on "Net Zero" and "Net Reduction" Thanks John!

gtwitch in wyoming

 

[AH64ID]

You need to just let it idle as fast idle overrides the stationary regen. If the DPF needs regen then the rpms will go from idle to ~900 and start a regen.

I would play with it prior to this hunting season to see it work yourself.


B. ISSUES IMPROVED SIGNIFICANTLY BY VARIOUS ECM SOFTWARE RELEASES TO DATE:

1/ The latest ECM software includes a new extended idle feature to accommodate the extended idle times present in some duty cycles. This feature may help to reduce the accumulation of soot in the exhaust aftertreatment system when the engine is idling for an extended period of time. Briefly how this feature works:

2/ a. As needed, the engine enters an idling mode which dramatically reduces the rate of soot accumulation in the diesel particulate filter (called “Net Zero”). Further, under extended idle periods of **5 minutes or longer**, the engine enters a mode which reduces the amount of soot accumulated in the diesel particulate filter (called “Net Reduction”). While in these modes, the idle speed increases to 900 RPM for a period of time. The idle speed may return to normal idle speed and then return to 900 RPM to repeat this cycle during very long idle periods.

b. **These modes occur automatically depending on the need to regenerate the DPF as long as the vehicle is not driven over 20 MPH or operated at high load. If the vehicle is driven over 20 MPH normal mobile desoot will occur automatically.**