kder Posted September 7, 2011 Report Share Posted September 7, 2011 Hi, I have a problem with my passat with the N75 not operating. Checks done so far: 1. Checked for vacuum at the N75 vac side - 25inhg, no vacuum on out side. 2. Replaced N75 with new valve but still not operating. 3. Checked wiring to N75 valve. Measured resistance and voltage drop from N75 valve plug to ECU plug - all fine. 4. Jumped N75 valve plug power side and set up other terminal to vechicle earth - N75 valve operates fine with manual earth. Good vacuum on out side and turbo actuator operates. The fault seems to be in the ECU. Is there any other checks I need to perform? Any other ideas? Thanks. Link to comment Share on other sites More sharing options...
cruiser647 Posted September 7, 2011 Report Share Posted September 7, 2011 Hi! How's your EGR valve looking? Might be worth cleaning it out. The housing the N75 relay sits in - is that all and earthed properly? Link to comment Share on other sites More sharing options...
kder Posted September 9, 2011 Author Report Share Posted September 9, 2011 Ran VCDS-Lite and the following code was displayed 1 Fault Found: 17564 - Manifold Pressure Sensor (G71): Open/Short to Ground P1156 - 35-10 - - - Intermittent Cleared the code a few times but it reappeared immediately. Do I need to replace this sensor or should I check the wiring also? Link to comment Share on other sites More sharing options...
cruiser647 Posted September 9, 2011 Report Share Posted September 9, 2011 That could well be a faulty MAF. Have you replaced that yet with a proper Bosch replacement? Link to comment Share on other sites More sharing options...
vwsteve Posted September 9, 2011 Report Share Posted September 9, 2011 hi there i think that the g71 sensor is situated in the turbo pipework after the intercooler and before the egr valve this checks the boost pressure if this is faulty it will tell the ecu not to enegise the n75 valve the car is effectively in limp mode hope this helps Link to comment Share on other sites More sharing options...
kder Posted September 13, 2011 Author Report Share Posted September 13, 2011 Just to follow up - the MAP sensor seems to have solved the problem. Thanks for the help. Link to comment Share on other sites More sharing options...
cruiser647 Posted September 14, 2011 Report Share Posted September 14, 2011 Just to follow up - the MAP sensor seems to have solved the problem. Thanks for the help. Yay!!!!! Link to comment Share on other sites More sharing options...
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