Vauxhall Workshop Service and Repair Manuals

Inductive Crankshaft Pulse Pick-up (Not Simtec)  

Measurement:	Plot of voltage at the signal output for the pulse pick-up on the crankshaft.
Check Objective:	Operational check

Preparation  

Switch off the engine and ignition.  

Connections  

INPUT A	COM/TRIGGER
Connect the red measurement lead to pin 2 of the plug connector for the inductive pulse pick-up. Connect the ground lead to pin 1 or ground.

Procedure  

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 cannot be triggered. In the event of this, the signal plot jumps on the display. However, lengthy observation of the display allows the technician to recognise 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 (swarf, dirt) and concentricity.