Bench Test a 3 Wire Crankshaft Position Sensor

[@N0Fumar]

Really hope this helps some people out. Hadn't seen anything like this yet on youtube, so wanted to help fellow car people out.

[@singpi8794]

0 v ok one or not?

[@eduardoenriquebarreto6269]

Good afternoon I was checking your video and I did a bench test to a crankshaft sensor Hall effect (3 cables) but I supplied 5V with a topdiag 200 tool, other cable to ground and the other to a multimeter to see the voltage flow but the voltage went from 1v to 0 when you approached an iron piece as you do In video, in this case why I have to use a resistance? Can you explain to me thanks

[@davidessien5465]

A 2005 Mitsubishi l200 with an inline 4 COP ignition system with an engine code of 4G64 SOHC engine installed in it was pretty okay. Thus, the client used it for some errands from the morning hours to the afternoon and it was perfectly running. Nevertheless, when the client returned home the 3rd time, his boy reversed the vehicle within the man's compound for a wash. If I'm not mistaken though, the car stalled on him or it was about 20 minutes ago when the boss was about to move again with the car that the noticed the problem. But they said it was only a reverse he did. The car would crank, start but stall immediately within 4 seconds. I was called to rectify and fix the issue. One of the things I checked when the car was cranked was the fuel system. With ignition on, the car wouldn't pump even an iota of fuel through the fuel hose to the engine. Bypassing the pump directly to the battery positive and ignition switch to the on position, there's a great pressure or amount of fuel from the fuel hose. Alternatively, I unplugged and plugged back the 3 wire CKP sensor connector and noticed a great buzz of fuel too. I proceed with testing fuses and relay from the engine bay and only one fuse was bad and it was replaced. From inside the car I all relays and noticed that the CKP sensor no longer pumps fuel to the engine with the unplugged and plugged method but the bypass method and noticed the relay location that controls the CKP fuel pressure buzz on ignition to the battery positive still wasn't affected. I didn't know more to do there than swap the relay. Next, I checked for injector pulse and noticed only a single or no pulse at all. I tried to hook up a scanner to conduct some test however, the scanner was not connecting. Next, I checked and observed that the timing was pretty weak. I showed the client, he said I should replace it which I did. Presently, it's a crank no start, single injector pulse no spark, no communication to my scanner. Please, how can I address this issues? How can I bench test the car 3 wire CMP, CKP sensor with a multimeter or a test light or LED light outside the car? Where is the fuel pump relay location. Please send me the car wiring too , partaining to the no start most likely.

[@riverflyswatter]

It’s in the perfect spot for the vans. Guess you can’t please everyone

[@obsoleteprofessor2034]

Take off the dog house?

[@fendercare]

Appreciate the video and thought this would allow me to test my 3 wire from a 2001 dodge Cummins. I bouught a new camshaft position sensor and hooked it up exactly as you had showed checked and rechecked several time t omake sure the connections were correct. Under these conditions bringing a metal object to the surface of the sensor would not trigger the switch and bring the voltage down - no change. However with the same sensor hooked to the wiring harness of the truck it switches exactly as describes with the metal object. Is this something current related do I need a resistor or more resistors of other sizes beside the 10K? Any insight appreciated.

[@N0Fumar]

Try it again but wave the metal in front of the sensor. It works by having metal rush past the sensor and create an electromagnetic field with the sensor. Double check your pinout as it may be slightly different for the Cummins (I know they can be fussy).

[@fendercare]

@@N0Fumar Thank you for the timely reply. But it worked exactly as you showed when connected to the wiring harness of the truck. Is the truck ECM allowing a different current to pass? Also pinout what do you mean and what should I be attempting to measure?

[@N0Fumar]

@@fendercare so the pinout is like the diagram in the book that I show for a few seconds on screen. I'd have to go find it and see if it is different for the Cummins. Try googling "2001 Cummins crankshaft position sensor wiring" and try to match it up how I have it in the picture I show

[@colin5064]

First let me thank you for this very useful video,just what l was looking for ref three pin bench test. The 10k resistor between 5v supply and signal imput is news to me l never knew this was required. This must be the reason why my previousr bench tests have failed, as this has never been included in my test kit hook up. Are resistors one directional or can they be fitted either way round?

[@N0Fumar]

@@colin5064 resistors are bi-directional, no need to worry about it. Glad you enjoyed the video!

[@colin5064]

@@N0Fumar Thank you for the kind reply,just ordered some 10 k ohms resistors this should improve my results when testing.Thank you

[@johnnybrown1036]

How about a 4 wire crankshaft position sensor. For a 92 Ford ranger 2.3l lima engine 5 speed trans? Can't find a diagnosis video for that.

[@CarlosGonzalez-hz3um]

Thanks for the procedure. But the crank in a car turns faster than you probe and so I wonder if the sensor may look fine with a slow test but not work well at a faster pace as required by the ECM. Perhaps a frequency setting on a multimeter may be a better test. Mine fails to show 5V randomly when away from metal.. (as if it gets stuck) but seems to start working again after a few tries.

[@N0Fumar]

Well, I mean it's analog electronics that's basically just a hall effect sensor. I guess anything is possible, but my guess is that if it's picking up and sort of reading on the multimeter you are probably fine. If anything, an analog (instead of digital) multimeter would probably be better so you can see swings easier.

[@paulme3388]

I have a ram 1500 ecodiesel 3.0. i can not get a digital output from the 3 "new" store bought ckp that i have ordered. do u know if there is some diff. test between 3 wire sensers?

[@N0Fumar]

What year is your diesel? Might have to look up a pinout for that specific year / model

[@glennnypiuk4156]

As an engineer your right on

[@N0Fumar]

From one engineer to another!

[@davidwillis5016]

Thanks

[@adamissah452]

Please sir i need the book ❤

[@JuanGutierrez-hg1jc]

honesrly it would be ezer to see your wiring insted of the diagram can you make onother video?

[@N0Fumar]

I can try to get a photo together

[@ChristopherPrice-so5vc]

Can you make it any more complicated

[@N0Fumar]

This is quite possibly as simple as it can be while accurately testimg it.

[@kylepinnell1499]

Talk too much just get to the point

[@N0Fumar]

Lol it's a 6 minute video with chapters. Idk if you can go much faster.