I have two Linde 394 series with VW 1.9 engines. The first one is a BJC engine code the second one is newer CBJB engine code. Both trucks have the same problem with intermittent charge pressure control positive deviation. The BJC code is 17965, the CBJB code is P0234. Has anyone found a faulty turbocharger that was causing this code? Please help with any suggestions. work already done: Verified vacuum hose hookups and line integrity, replaced N75 control, swapped map & maf sensors. Looking at the boost pressure on the laptop screen can see short blips of higher than commanded boost pressure.
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Thanks for the replies, we have lengthened the turbo diaphragm linkage and the units no longer code out. I am suspicious that this is a bandaid on the real problem. With two trucks out of service I am OK with this fix for now. I will replay back with the actual fix once we find it. So far the power seems unaffected and the boost rate comes right up as commanded.
Thanks again
after sifting through the manual i see nothing about a turbocharger causing this issue.
The blip on the monitor you see sounds like the N75 charge pressure control solenoid in operation as it says it is actuated in a pulse manner so that the extreme values for charge pressure control can be read in the measured value block.
For both those codes it speaks of leaks in the hosing and specifies using a special test guage to check the system for leakage. They call it a V.A.G. 1687 , also a mention of an ultrasonic tester V.A.G. 1842. They basically look like a sophisticated vacuum air gauge tool.
H50D H2X394S041** BJC,
H50D H2X394B001** CBJB
whats the complete model and serial number?
we have found these variable nozzle turbo stuck in this engine in one of our customers because of carbon sediment. So if N75, vacuum pump and vacuum hoses are right could be there your problem.
Good luck
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