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The fuel level indicator
Due to the different heights of the fuel tanks, four fuel level senders are required to calculate the
remaining fuel amount correctly. The signals from all the senders are evaluated in the fuel pump control
unit. The resulting signal runs via the CAN convenience bus to the dash panel insert and is used to
control the fuel level indicator. The fuel pump control unit is self-diagnosable by address word 58.
Control unit for fuel pump J538
The fuel pump control unit is located in the spare-wheel well embedded in plastic. It is connected to the
CAN convenience bus. The control unit is therefore connected to the dash panel insert. It has the
following tasks:
Evaluating signals from the four fuel level senders
Controlling the fuel level indicators
Controlling the fuel pump G 23 in the additional fuel tank
Controlling the tank warning lamp
Fuel pump
control unit J538
S261_023
21
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