Hi can some kind person please tell me how to test a crank position sensor with a multi meter its a 3 wire vauxhall one.

cheers steve.

 

You can use a resistance meter to measure the resistance of the sensor as it is just a coil of wire.

Expect a reading between 800 and 1800 ohms.

You can then switch the meter to AC voltage and crank the engine.
You should see a voltage of at least 20 volts when disconnected from the ecu.

The only reliable way of checking its operation is when it is connected to the ecu and using an oscilloscope to view the wave form.

 

cheers but any idea which two out of the 3 wires i need to stick the meter on

 

Sorry, I assumed you were talking about a cossie sensor

What car is this from ?

EDIT :: I am fooking blind


I dont know the vauxhall ones ... Sorry !!!

 

Should have gone to spec savers !!! lol

cheers anyway its a mk 4 astra non start.