Knock Sensor, Component Description - GF07.04-D-6030HD

WARNING: This page does not describe the selected car, but rather 12 other vehicles, including the 2018 Mercedes-Benz Sprinter 3500XD, 2018 Mercedes-Benz Sprinter 3500, 2018 Mercedes-Benz Sprinter 2500, 2017 Mercedes-Benz Sprinter 3500XD, and 2017 Mercedes-Benz Sprinter 3500. However, it is still accessible from the selected car via links, so may be relevant.

with CODE MZ0 (Blue EFFICIENCY)

with CODE XZ1 (Model generation 1)

ENGINE 651.955/956/957 in MODEL 906

Courtesy of MERCEDES-BENZ USA

Shown on model 906

Location

Knock sensor 1 and knock sensor 2 are located on the left side on the crankcase.

Task

The knock sensor 1 and knock sensor 2 detect the vibrations on the crankcase which occur due to injection and the associated combustion in the individual cylinders.

The knock sensor 1 and knock sensor 2 transmits the detected vibrations as voltage pulse to the CDI control unit (N3/28).

Body

Knock sensor 1 and knock sensor 2 are composed of the following components:

Seismic mass
Adhesive
Piezo element
Bonding
Electrical connection

Function

The vibrations on the crankcase are transmitted over a seismic mass on an inner piezoelement and are converted into electrical voltage pulses.

The information obtained from evaluation of the signals of the knock sensor 1 and knock sensor 2 from the CDI control unit is used for zero quantity calibration of cylinder 1 injector (Y76/14), the cylinder 2 injector (Y76/15), the cylinder 3 injector (Y76/16) and the cylinder 4 injector (Y76/17).