Display engine speed, function - GF54.30-P-3021GZ

MODEL 164

Shown on model 164.1

Networking

Fig 1: Engine Speed Function Diagram - Shown On Model 164.1

Courtesy of MERCEDES-BENZ OF NORTH AMERICA.

Networking

The rpm is recorded by the crankshaft position sensor (engine 113, 156, 629 only) or by the crankshaft Hall sensor (engine 272, 273, 642 only).

The signals are read in by the ME-SFI [ME] control unit or by the CDI control unit and placed on the CAN engine compartment as a CAN message (in rpm)

The instrument cluster receives the CAN message and actuates the stepper motor for the tachometer relative to the engine speed.

Warning range

The warning range (marked in red on the scale) is below the end value of the scale. The final scale value on vehicles with gasoline engines is 7000 rpm.

Adjustment for the number of cylinders

An adaptation for the tachometer to the number of cylinders of the engine is not correct.

If implausible CAN messages occur, the needle of the tachometer is moved to the left-hand side of the scale.

An error bit is also stored in the fault memory.

Display distance, function

GF54.30-P-3022GZ