Fig. 155 – Preinjection measurement
A pressure sensor mounted on the engine injection pipe of the first cylinder is used to scan the fuel transport start.
To determine the top dead centre, you can either use the stroboscope, the inductive sensor or the semiconductor
sensor. The preinjection measurement is very similar to advance measurement see Chap. I - 5.1, with the
difference that we read preinjection values instead of advance values.
6.2 VOLTAGE AND CURRENT MEASUREMENT
This function is identical with the function described in Chap. I - 5.2.
6.3 PRESSURE SENSOR SIGNAL
This function serves to display the signal course from the pressure sensor mounted on the engine injection pipe,
see Fig. 156.
Fig. 156 – Pressure sensor signal measurement
By moving the pressure sensor on the injection pipe of individual cylinders, it is possible to make the relative
comparison of injection pressure courses.
6.4 THERMOMETER
This function is identical with the function described in Chap. I - 5.5.
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