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Old February 20th, 2014, 22:33   #409
kblee27
Newbie
 
Join Date: Sep 2010
Location: SG
TDI(s): Caddy
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I've read the first page till the last. My TDI has a persistent P1550 code.
I've tried, checked, some replacement, almost everything. N75 solenoid, MAP, MAF, actuator, vacuum lines. Nothing.
Except I can't reached to clean the turbo or intake manifold.

However, I did note that when I plug the full vacuum into the actuator, I get boost. When I put it back to N75, nothing happens. I only get very small boost of about 5 psi.

Finally, after a couple of years of driving with low boost, and suspecting the boost control problem, my workshop change the ECU.
Instantly, the boost came back.

So it was a defective ECU which did not control the N75.
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