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LT35 2.5 TDI Fault codes 17957 & 16955

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Eddy Dar View Drop Down
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    Posted: 06 Feb 17 at 16:16
Hi All,

I have recently done a head change on a 2003 2.5 tdi LT28 (oops not 35) 2.5 TDI & after clearing all codes using VAGCOM the following Fault codes re-appear, not to sure if they were their b4 as i bought the van as a non runner. The glow light comes on goes off and starts flashing within a few secs.

17957 Boost pressure regulation Valve (N75) 

P1549-30-10 Open or short to ground Intermittent

Power is down, turbo is spooling up


16955

Brake Switch (F)
P0571-35-00 Implausible signal (Brake lights work on the pedal, no brake lights are out both reg plate lights are working)

The van has been stood outside for quite some time with the head removed. 

Starts fine just need fuel timing sorting.


Edited by Eddy Dar - 06 Feb 17 at 16:19
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Eddy Dar View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Eddy Dar Quote  Post ReplyReply Direct Link To This Post Posted: 22 Feb 17 at 15:14
I have taken voltages mesurements across the N75 valve and i am getting 12v.

I have also taken voltages from each terminal to ground and I am getting 12v on one side and then about 11v volts on the other. 

Surely the 11v is wrong and that this should have been 0v

This would be perhaps the reason why Im getting the short to ground fault.
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