Component description for the intake port shutoff motor - GF09.20-P-6110P

ENGINE 642 in MODEL 164.1/8, 203.0/2, 221.0/1, 251.0/1 up to Model Year 08/AEJ 07

ENGINE 642 in MODEL 209.3/4, 211.0/2/6, 219.3

ENGINE 642 in MODEL 463

Shown except code (494) USA version

Fig 1: Locating Intake Port Shutoff Motor

Courtesy of MERCEDES-BENZ OF NORTH AMERICA.

Location

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

Task

The intake port shutoff motor adjusts the flaps in the intake ports in the charge air manifold according to actuation by the CDI control unit (N3/9).

Design

Fig 2: CDI Control Unit Circuit Diagram

Courtesy of MERCEDES-BENZ OF NORTH AMERICA.

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.