Objective:
Check operation of the impulse sensor on the crankshaft.
Measurement:
Plot of voltage at the signal output for the impulse sensor on the crankshaft.
Preparation:
Switch off the engine and ignition.
Connections:
| INPUT A | COM/TRIGGER | INPUT B |
|---|---|---|
| Connect the red measurement lead to pin 2 of the plug connector for the crankshaft impulse sensor. Connect the black ground lead to pin 1. |
Procedure Tech 31:
- 1. Download Reference curve.
- 2. Start the engine and allow it to idle.
Reference Curve:
The change in the inductive voltage at the tooth gap of the crankshaft gear can sometimes be so small, that the signal can’t be triggered. In the event of this, the signal plot jumps on the display. However, longer observation of the display allows for the recognition of the impulse resulting from the tooth gap.
The signal plot should be continuous and regular. If the amplitude of the signal plot varies greatly, in spite of the engine speed remaining constant, the crankshaft gear must be checked for soiling and concentricity.
Procedure Tech 32:
- 1. Download Setup File (the Tech 32 uses only Setup files, no reference curves).
- 2. Start the engine and allow it to idle.
Setup File:
Reference Curve:
The change in the inductive voltage at the tooth gap of the crankshaft gear can sometimes be so small, that the signal can’t be triggered. In the event of this, the signal plot jumps on the display. However, longer observation of the display allows for the recognition of the impulse resulting from the tooth gap.
The signal plot should be continuous and regular. If the amplitude of the signal plot varies greatly, in spite of the engine speed remaining constant, the crankshaft gear must be checked for soiling and concentricity.