This is really really helpful and I'm so glad I found your channel. I have a Hall effect sensor that is serving as the vehicle speed sensor, detecting the teeth of a tone ring that rotates with the rear drive shaft. It's currently not installed in the vehicle, so I can't test it with the PCM, but when I power it with a 9V battery, I either get a signal of 0.6V or 0.1V when a ring tooth is in position underneath it. Should I be getting the full 9V through the sensor when there is no metal present? Does this mean my sensor is faulty?
Also the video at 5:46 shows an increase in voltage of 3.809 volts vs 2.5 volts. According to Ohms law, introducing a resistor in series in the Ground wire will decrease the current flow and hence a lower voltage at the signal wire. But the opposite is happening in the video. And the same resistor connected to the hot side gives another different voltage reading. Why?
I’m not measuring current. You are correct that increase in resistance decreases current, but I’m measuring voltage. Increase of resistance in the ground circuit increases voltage measurement on ground pin of sensor, since more electrical pressure (voltage) is needed to over come the downstream resistance. So the voltage across the entire sensor sweep increases also. That makes the sensor wire read higher voltage.
hi craig, thanks for the video, I know how to test for the ref wire and ground, what if the sensor itself is faulty, ie the resistor in sensor is gone, would you get 5v at the signal wire, is this because its a pull down circuit? Also what would be best way to test for signal wire itself. ( using a test light connect to ground and touch signal wire?) and if its pull up circuit, put the test light on +ve terminal? thanks in advance
Hello Sir How are you Your video very helpful But 1 question in my mind Please tell me How can we make this sensor testing white board Please share this waring daigram with explained Then we can make this tester Please sir.
hello sir I hoppe you can help my with my task the thing is I tryed to use potenciometer to by preciseli 500k potenciometer on 4 pin GM Ignition Module originali I wanted to retard my ignition timing because in winter I have starting problems and the original ignition module uses the mc 3334 ic chip so it has lot restrictions the wires I used were speaker wire sadly I didnt have any thing ells so I did in fact retarded ignition timing but engine didnt reali run great I did fire at exaust stroke not at compresion how ever so I ques wires and resistance in those speaker wire were to much great from ignition module to cabine potenciometer and back to ignition module . So I hade mostli wrong components. So my question is how to solve that problem with wire reaistance or is there other way to force ic chips like 555 timers to phase shift frequency to specific range? or ignition coil manipulation or pick up coil disruptive circuet or similar? I looked at those remote controled relays so Im not shure wuld that work or not. Also I considered to use dual 4 pin GM Ignition Modules I tested them and indead 1 pick up coil can fire 2x GM Ignition Modules now I have problem I actuali dont know what wires to use and what resistor or capacitor type to use to get at least close desired fiering angel degree for pulsed dc out put??? Thats what confuses my honestly about sensors and inductors in general how are they phase shifted???
Thank you for this great video, accurate,concise and excellent presentation, please post more 🙂
Stronger the basics the better the knowledge, love the way you grind in the basics and theory😊
Amazing explanation. I been dealing with a few sensor issues recently and this has filled in the gaps. Much appreciated ur time. Russell, qatar
Learnt a lot from that!
Brilliant explanation, thank you.
Excellent presentation. This gave me some very useful information.
Dude thanks for share your knowledge. Excelente explanation
The video time at 5:18 shows voltage of 5.05 volts. Is your DMM Black Lead connected to the Negative terminal of the battery?
Yes
Good day to u , I look at your video so informative understand digital an analog signals thanks
Excellent break down!!!
Great job!
sorry my last comment was already covered on another video before this…..i subscribed to this channel.
Very good job thank you.
This is really really helpful and I'm so glad I found your channel. I have a Hall effect sensor that is serving as the vehicle speed sensor, detecting the teeth of a tone ring that rotates with the rear drive shaft. It's currently not installed in the vehicle, so I can't test it with the PCM, but when I power it with a 9V battery, I either get a signal of 0.6V or 0.1V when a ring tooth is in position underneath it. Should I be getting the full 9V through the sensor when there is no metal present? Does this mean my sensor is faulty?
Thanks . Very clear.
Also the video at 5:46 shows an increase in voltage of 3.809 volts vs 2.5 volts. According to Ohms law, introducing a resistor in series in the Ground wire will decrease the current flow and hence a lower voltage at the signal wire. But the opposite is happening in the video. And the same resistor connected to the hot side gives another different voltage reading. Why?
I’m not measuring current. You are correct that increase in resistance decreases current, but I’m measuring voltage. Increase of resistance in the ground circuit increases voltage measurement on ground pin of sensor, since more electrical pressure (voltage) is needed to over come the downstream resistance. So the voltage across the entire sensor sweep increases also. That makes the sensor wire read higher voltage.
Thank you!,,
The best video
Thanks for a very informative demonstration appreciate 👌👍💐
Great job
hi craig, thanks for the video, I know how to test for the ref wire and ground, what if the sensor itself is faulty, ie the resistor in sensor is gone, would you get 5v at the signal wire, is this because its a pull down circuit? Also what would be best way to test for signal wire itself. ( using a test light connect to ground and touch signal wire?) and if its pull up circuit, put the test light on +ve terminal? thanks in advance
Duuude, great video
When are you making new videos?
What if u get voltage on the signal wire if its unplugged from the sensor?
Hello Sir
How are you
Your video very helpful
But 1 question in my mind
Please tell me
How can we make this sensor testing white board
Please share this waring daigram with explained
Then we can make this tester Please sir.
Interesting
On a 3 wire sensors that is ground side activated, how do you test the ground without a bi directional scanner?
Back probe ground wire with multimeter
What about a 4 wire sensor? For example a 4 wire pressure sensor with a built in temp sensor.
hello sir I hoppe you can help my with my task the thing is I tryed to use potenciometer to by preciseli 500k potenciometer on 4 pin GM Ignition Module originali I wanted to retard my ignition timing because in winter I have starting problems and the original ignition module uses the mc 3334 ic chip so it has lot restrictions the wires I used were speaker wire sadly I didnt have any thing ells so I did in fact retarded ignition timing but engine didnt reali run great I did fire at exaust stroke not at compresion how ever so I ques wires and resistance in those speaker wire were to much great from ignition module to cabine potenciometer and back to ignition module . So I hade mostli wrong components. So my question is how to solve that problem with wire reaistance or is there other way to force ic chips like 555 timers to phase shift frequency to specific range? or ignition coil manipulation or pick up coil disruptive circuet or similar? I looked at those remote controled relays so Im not shure wuld that work or not. Also I considered to use dual 4 pin GM Ignition Modules I tested them and indead 1 pick up coil can fire 2x GM Ignition Modules now I have problem I actuali dont know what wires to use and what resistor or capacitor type to use to get at least close desired fiering angel degree for pulsed dc out put??? Thats what confuses my honestly about sensors and inductors in general how are they phase shifted???
Subbed so you can turn me into wiring god