Variable Induction Control Actuator: Description and Operation

GF09.20-S-6130SA Component Description For Intake Port Shutoff Actuator Motor

ENGINES 642.8 in MODEL 906
- with CODE (MG5) Engine OM 642 DE 30 LA, 140 kW (190 hp) 3800 rpm
- except CODE (ZU7) National version for Canada
- except CODE (ZU8) National version for USA

ENGINES 642.8 in MODEL 639
- with CODE (XZ1)
- with CODE (MZ0) Blue EFFICIENCY

View of engine from above






M72/2 Inlet port shutoff positioner

Location
The intake port shutoff positioner is located between the engine's two cylinder heads downstream of the fuel main filter.

Task
The intake port shutoff positioner adjusts the flaps in the intake ports in the charge air manifold according to actuation by the CDI control unit (N3/30).

Design






a Ground
b Supply voltage
c Pulse Width Modulation (PWM) signal

A Control lever (in rest position)
B Spring
C Potentiometer
D Direct current motor
E Integrated electronics

M72/2 Inlet port shutoff positioner

Function
The CDI control unit specifies the set value for the flap position by means of a PWM signal. The signal is evaluated by the integrated electronics. The DC motor pushes the adjusting lever into the corresponding position.

The potentiometer serves as an angle sensor, so that a specified/actual value comparison of the adjusting lever position takes place. In the event of any malfunction or break in the supply voltage, the spring acts on the control lever to return it to its rest position. The flaps are open in the reclining position.