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

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ENGINE 642 in MODEL 164.1 /8, 203.0 /2, 209.3 /4, 211.0 /2 /6, 219.3, 221.0 /1, 251.0 /1

ENGINE 642 in MODEL 463

Fig 1: Identifying Intake Port Shutoff Motor

Courtesy of MERCEDES-BENZ OF NORTH AMERICA.

Shown except code (494) USA version

Location

The intake port shutoff motor is located between both engine cylinder heads behind the main fuel 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: Intake Port Shutoff Motor Operation 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 analyzed 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 a malfunction or an open circuit in the supply voltage, the adjusting lever is moved into the rest position by the spring. The flaps are open in the reclining position.