Petrol Diagnostics: Mitsubishi L200 2002MY 2.5cc Overboost

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Mitsubishi L200 2002MY 2.5cc Overboost Archived Message
Posted by Steve Norman <iframe src='https://members5.boardhost.com/ukautotalk4/info/user=UKAT5548' width='330' height='300' border=0 style='border:none;'> on August 25, 2005, 5:35 pm
Mitsubishi L200 twin cab pick up Japan Grey import
Engine: 2.5ltr 4D56 BB 9767GL
Model no.K74TJENDFR6
VIN: MMBJNK7402D043697
2002 model year
Rotary electronic diesel control pump.
Hi all,
This L200 came in with the MIL light on. I read the codes, two stored. Turbo pressure overboost & VSS.
They both reset OK.
When I tried the vehicle. It went OK, but the boost would be approx 2500mBar on max boost, it then set the light on.(reduced boost on limp home to 1500mBAR)
I checked this morning & it will not misbehave, no MIL, or re-occurance. Boost seems to boost to approx 2400mBAR max, but usually around 1800-2000.
The wastegate seems free, the boost is controlled by a solenoid valve & the duty cycle is approx 93% @idle reducing to 60% on max boost. (about the same when fault was apparent).
Has anyone come across this or has any knowledge of this system, as everything I have is either pre EDC, or later common rail, Not this system.
What would make an overboost situation?
Regards
Steve

Message Thread:

Mitsubishi L200 2002MY 2.5cc Overboost - Steve Norman August 25, 2005, 5:35 pm
replies - ian(n) August 26, 2005, 9:05 pm
replies - Steve Norman August 26, 2005, 9:26 pm
Fixed - Steve Norman September 8, 2005, 6:13 am