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Posted by Keith in Washington [24.41.41.111] on Friday, April 23, 2010 at 11:35:40 :
In Reply to: O/T Cummins Turbo query... posted by Jon Kelly [166.128.88.170] on Friday, April 23, 2010 at 09:52:43 :
Found the following when I Googled "code P2262- Turbocharger Boost Pressure not detected-mechanical" Seems to be a issue with the turbos. Reading some of the posts on this is seems to be the turbo is getting carbon build up due to short in town or very light use. It appears that engine may not be fully warming up therefore carbon build up. Diesel carbon build up is common on lightly used, short trip, city driving trucks that only carry a six pack of beer in the bed from time to time.
"The variable geometry turbocharger (VGT) is electronically activated by the Electronic turbo actuator. The Electronic turbo actuator is a smart device and receives information via the J1939 datalink from the ECM. The Electronic turbo actuator performs its own diagnostics and reports failures back to the ECM using the J1939 datalink. The ECM then decodes the error message and converts it to a fault code. The ECM lights the MIL lamp immediately after the diagnostic runs and fails. The ECM will turn off the MIL lamp immediately after this diagnostic runs and passes in 4 consecutive drive cycles.
* When Monitored: Ignition on.
* Set Condition: The VGT sliding nozzle is slow to move or is unable to move to the fully closed position at initial key-on. The physical limits of the VGT sliding nozzle have been found to be greater than or less than 100%.
Possible Causes
ELECTRONIC TURBO ACTUATOR
TURBOCHARGER"
This issue reminds me of the problem that FORD had with their 6.0 international diesel. That thing would carbon up in the turbo and also the ERG valve. They had to redesign the turbo to solve the issue. Mine lost it's first turbo to that. The new style turbo has a way to dump the carbon somehow. I have had very little trouble with mine as I am always at 12,500 lbs with the camper and often have the trailer and PW behind that which pushes my GCVW to 22K lbs. My truck has averaged about 48 MPH for every hour the engine has run which shows I do a lot of long freeway trips which stops any/most carbon build up.
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