18447/P2015/008213 - Intake Manifold Flap Position Sensor (Bank 1): Implausible Signal

• check/inspect, clean, or change the intake if flap mechanically out of range due to wear and or sensor. And Check/inspect, change coolant pump or correct the relay for the AUX coolant pump before it is a problem......don't forget fuses!

• Cabling :
https://www.passatworld.com/threads/008213-intake-manifold-flap-position-sensor-bank-1-my-solution.398713/

Possible Symptoms
• Malfunction Indicator Light (MIL) ON
• Power Loss
Possible Causes
• Intake Manifold Flap faulty
• Intake Manifold Flap Motor (V157) stuck/faulty
• Engine Control Module Software/Firmware Version faulty
• Wiring and/or Connector(s) from/to Intake Manifold Flap Motor (V157) faulty
Possible Solutions
• Check Intake Manifold Flap
• Check/Replace Intake Manifold Flap Motor (V157)
o Perform Output Tests/Basic Setting
• Check Wiring and/or Connector(s) from/to Intake Manifold Flap Motor (V157)

To do :
https://www.ross-tech.com/vcds/tour/out_test.php
According to info here on tdiClub, when in the 011 group "Basic Settings" under "Measuring Blocks" is supposed to perform one output test ~ cycle the N75 valve.

Engine running at idle.
Select the ENGINE Controller
Choose BASIC SETTINGS -04,
Choose GROUP 011 (or turbo controls from the pull-down menu)
Choose GRAPH if you want, or just watch the numbers.
The N75 duty cycle will cycle from OFF to ON every 5 seconds or so. (about 10% duty cycle to about 90% duty cycle.)
The MAP actual pressure should cycle at least 30 mbar with a stock turbo if the test is done at idle - as the ALH engines do. (less change will probably occur with a larger than stock turbo.) If the engine accelerates to 1400 rpm (as the PD engines do that I am familiar with) then the MAP should change by at least 80 mbar. I would say that most PD engines with stock turbos change about 150 mbar from min boost to max boost at 1400 rpm.
The turbo vane actuator should cycle up and down about 11-14 mm (depends upon turbo - others may have different travel) and it should pull up firmly onto the full travel stop set screw.
You can hear a definite sound change in the exhaust - very noticeable.
If you hook up a vacuum gauge to the N75 output to the vane actuator it should change from about 2" hg vacuum (or less) to about 20" hg vacuum (or more).

So with this test you can check whatever you need on this control loop for basic troubleshooting.