Function of the injection system: - ra07126020010x(0010)

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L. Control rod travel sensor (L7) Engine 602.96, 603.96/97 TURBO (Model 463.3: pay attention to variations)

L. Control rod travel sensor (L7)

Installed in the governor of the injection pump. The control rod travel sensor consists of an iron core, two coils (measuring value and fixed value coil) and two short-circuit rings. It is connected to the electronic control unit by a 3-pin plug.

The coils (b) and (d) are attached to the iron core (a) which is fixed in the housing. The short-circuit ring (e) is connected to the control rod (2t) and is displaced with the latter without touching on the bottom leg of the iron core. The fixed value coil (b) and the short-circuit ring (c) are attached to the top leg.

Fig 1: Identifying Control Rod Travel Sensor Components

Courtesy of MERCEDES-BENZ OF NORTH AMERICA.

Function

The fixed value coil (b) with the short-circuit ring (c) represents a constant inductance.

Depending on the change in position of the control rod (2t), the distance between the short-circuit ring (e) and measuring coil (d) alters. The variable inductance which is thus produced is compared with the constant inductance. From this the electronic unit determines the control rod travel.

Fig 2: Control Rod Travel Sensor Function

Courtesy of MERCEDES-BENZ OF NORTH AMERICA.