You can either use a multimeter or a lab scope. When using a multimeter check the 12 volts from the battery at the connector then take the sensor out and check the resistance from the sensor's pins. Check the specs from the manufacturer. Although a correct spec does not necessarily means the sensor is good. This sensor normally fails when they are hot and not when they are cold. The advantage of using a lab scope is that you can test the sensor while the car is hot and running and by seeing the wave
how to test crank sensor
To test a crankshaft position sensor on a 1996 Jimmy Blazer, use a CKP sensor to test for voltage output. Compare the results to manufacturer specifications.
purchase an actron sensor tester for about $40 and follow the directions
Probably not as the emissions test (Smog test) is carried out by inserting a sensor into the exhaust pipe.
Sure can...hook it up to a diagnostic and it should bring up a code telling you that the sensor is out.
A computer diagnostic test will generally tell you if you have a faulty crankshaft position sensor.
The crankshaft sensor in your 1990 former Roche is located on the front of the engine. The best way to test your crankshaft sensor is to hook the engine to a Dyno tester.
The attached to the "Related Question" below has links to Autozone's Chiltons Repair Manual - specifically the O2 sensor sections. Not only covers installation, but there are instructions on testing.
Crankshaft sensors usually either work or they don't. However, using a vom meter, you can test the resistance of the sensor to see if its working.
ohm test it.
Using a scanner with a scope, you can view the output wave of the sensor as you crank the engine.
With sensor removed the business end should be magnetic. While the sensor is disconnected and removed, probe the two pins for resistance with an ohm meter. The circuit should not be open.