How to test a crankshaft position sensor

[@plowe6751]

4:34 What is the impedance rating of Dyvo? I was expecting the impedance of Dyvo to pull down the 5 volts from the signal circuit, but that didn't happen. I see a full 5 volts.

[@ernestdamo677]

Please can i use other multimeter to do it

[@ramongonzales1631]

If it's a pull down why do you connect dyvo to POS output? I thought to pull it down you come at it with a ground

[@dyvoautomotive]

Great question, and you're absolutely correct! For pull-down circuits, you want to pull it down to ground. When DYVO is in LOAD Mode, the positive channel is loaded through an internal connection to ground. This allows us to safely pull a circuit down to ground. At the same time, the negative channel on DYVO is internally connected to B+. This loads ground circuits and allows us to pull-up a circuit by connecting it to B+ safely. Quick recap: For pull-down circuits (they sit high when unplugged), pull them down using the Positive channel on DYVO in LOAD Mode For pull-up circuits (they sit low when unplugged), pull them up using the Negative channel on DYVO in LOAD Mode

[@philh9238]

Sounded like it had a broken timing belt at the beginning when you first started cranking it

[@dyvoautomotive]

Great catch! Yep, if you listen close, you can hear the cranking is off and no compression. This vehicle had been sitting for almost a year and had a lot of other issues, including all the wires to the ignition coils were chewed by rodents. In this video, we only focused on testing the crankshaft position sensor.

[@plowe6751]

5:00 Load mode sounds dangerous. What if you accidentally go into load mode while testing the control-side circuit of a relay. Wouldn't that fry the computer?