Function
The intake manifold flap position sensor detects the exact angular position of the intake manifold flap during the active regeneration process.
Effects of faults
The effects are similar to a failure of the intake manifold flap solenoid valve (see relevant section in this lesson).
Diagnosis
The monitoring system checks:
โข for short circuit to ground/battery and open control loop,
โข for plausibility (required value from the timing map to the value actually set).
Moreover, it is checked via the position sensor with the ignition OFF whether the intake manifold flap is completely open.