How to do a CRANK position sensor test in 15 seconds Do this CKp test INSIDE the car. Know immediately if you have a failing CKp sensor, which often has NO EML & NO code. 🎥 How to clean a MAP More specifically, the CKP sensor produces a signal that tells the fuel injection computer or the ignition control module the exact position of the cylinder pistons as they come up or go down in the compression cycle. To test the crank sensor, you'll need a multimeter capable of testing continuity, voltage, and AC voltage or frequency. You'll also need to identify the location of the crank sensor, which varies depending on the vehicle make and model. How to test a 3-Wire Crank Sensor with a Multimeter? Here is how you can easily test both your crankshaft position sensor and camshaft position sensor. It's very important to be able to test these sensor since because they control your Fo4E.