no one is as thorough and meticulous as Paul.....NO one. I watch other repair channels sometimes and I always come back to scannerdanner because no one else on youtube has the level of expertise. I bought your Ebook. it is awesome.
Absolutely love this whole 5v ref series! It’s so incredibly vital to understand these circuits we work on. you have a very strong passion for the industry and gift for teaching. Thank you Paul, for the unbelievable amount of hours you have invested in teaching others. It’s extremely appreciated by so many! 🤘
Parabéns amigo, gostei muito da seriedade e do profissionalismo em que explicou o uso do resistor de 5k ohms na verificação do circuito (chicote central). Agradeço pelos conhecimentos e com isso (estou treinando inglês para um dia poder trabalhar nos USA) Abrigado
Thanks man. I've been doing this test for over a decade and never had an issue. I was mainly using it to ensure that the signal wire was not open. After thinking about what would happen if the signal wire was shorted to ground (not common), I felt the need to modify this test.
Go to my website listed on my youtube channel page. I cannot post the link here. The ebook is $49.95 and is NOT vehicle specific. You will have access to the book immediately after purchase no matter where you live in the world. Thanks for your interest.
Yes, but remember some of them all you need to do is unplug it and the signal voltage will already be at 5v. If this is the case you do not need to do the jumper test with the resistor. Also remember this test is used to check signal wire integrity and NOT the sensor itself. Although if the sensor signal is fixed at 0 and unplugged it goes to 5v, this suggests a shorted sensor.
No problem bro. Just want to be as cautious as possible. Especially when we do testing "outside of the box". I am going to change the ebook to match soon, so look for it.
Hey ScannerDanner I really like watching your videos. I always seem to learn something new. So thank you for sharing your knowledge, and cool test by the way. I think I will use that technique in the future as a safeguard. Watching your video towards the end at around 14:40 when you were going over jumping the 5K ohm resistor between the 5v wire and signal wire. You mentioned how the 5v would not have a voltage drop and be lower on the signal wire because of no current flow, and that it is just going to a voltmeter inside the PCM. In my mind, I see a series circuit with two loads in it (1 being the 5k resistor, and 2 being the voltmeter itself inside the PCM) The way I see it current should still flow across both loads and the voltage should drop proportionately based on the resistance of each load. So if you have 5v supply and R1 is 5k ohm and R2 is 10,000,000 ohms (typical volt meter internal resistance or so I thought) So doing the ohms law math I came up with about a .049 Volt drop (give or take a few) across the 5k ohm resistor and about a 4.95 volt drop across the meter. Would it not work that way? I think I saw a tiny volt drop when you showed the test around 6:30 in your video. With 5k ohm resistor in place your meter shown 5.01 V on ref side and on the signal side it shown 4.99 V. Would that not be a voltage drop and current flow happening there. I think having such a high resistance circuit makes the current super super super low, and almost completely gone (really probably not even measurable current, without expensive equipment), but even though the resistance is high in the circuit and the current is low, there are still measurable voltage drops going on in this circuit, I think. Just hard to see it, but if you replaced the 5k ohm resistor in R1 with a 10Mega ohm resistor (something closer to the meter value you would see the voltage drop better). I would think in that case you would be able to see the voltage drop much clearer and have equal or much closer voltage drops across the resistor and meter, probably around 2.5V on each in this circuit. Anyway just something I was thinking about, and I was curious what your thoughts are on it. Well thanks again for the awesome lesson, I appreciate it. Thumbs up from me. I will be subscribing to your channel and watching more of your videos. Thanks for your time and have a good day sir.
It took me a while to understand what your trying to teach. To make it short-- is the voltage referance wire bad-- or was the potentiometer bad-- or was the return signal wire bad-- --or was the computer bad?? The volatge referance and potentiometer is good because there is 5 volts in and out of the potentiometer as throttal opens. The signal return and computer is good because 5 volts was shown at scope when jumped with a proven 5 volt reference. But the main lesson is>> if the signal reference is shorted to ground and you jump it backwards you could fry the computer.. I am not so sure this true because it all ready might have been shorted to ground. Ampearge is what heats and frys a circut not voltage. This must have been anticipated by the engineer and must have built it circuit protection. If somebody understand this better than me let me know......And Paul did say in 20 years he has never fried a circuit this way. .
I have a 1994 pickup with 22re motor, 4 cil, 2wd, no power steering, I have no problem identifying the 5v cable, my tps has 4 pins, how can I identify the signal wire? Another question where do you sell your book?
Any Version is fine as what you get with newer ones is newer model year component info. Version 7.0 or 8.0 is the last update for that tool. I have a version 6.0 and I am updated to 2002 model year. This doesn't mean I cannot use the tool on newer cars. I just will not have vehicle specific component info.(best tool I ever bought)
I would if I worked on more of them. I just don't see too many turbo charged cars and when I do, it is the same types of failures that an NA engine has.
Hello, Paul. I love watching your videos. You show us faster and safer way to troubleshoot. I was wandering if I could use a test light, connected to B+ and touch on the Signal wire; test light lights: Short to ground in the signal wire.
That is correct, although I wouldn't call it "large amounts of current" A typical 5v regulator can only handle around 1 amp of current before it burns up. To the regulator this would be a large amount of current.
Ok I’m trying to help a single mom with her suv through this covid pandemic it is a 2002 Chevy trailblazer and it is in limp mode the work is free of charge ..but I inclined to the electrical side ..but I really like and understand how you explain things ..where can I buy your book on this tps 5 volt ref. I have figured out how to test the app or the tps on her vehical ..need help !!!!!
Hey scannerDanner, great vids! Keep up the great work, I am learning a ton! I predict you grow in popularity a TON within a couple of years. I'm subscribed!
Need a process to bench test a throttle body with the tps incorporated in the side of the body. I have performed resistance test manually operating the butterfly valve but have no way to know what the adequate range is. Also, does this unit need to be powered up to test properly?
Its very tricky when testing it cold and its ok. But when the engine reaches its operating temp and everything gets hot and expands the signal wiring in some old cars gives a higher reading and rpm surges and u think its a vacuum leak. What a wild goose chase i had in a year!!
Exceptional video and teachings concerning wiring of this degree! Got a question! I have a 1996 dodge ram 1500 5.2 magnum 4×4 When I remove the plug from the TPS sensor and check the voltage. I have 5.8 volts on the reference wire and 5.7 volts on the signal wire. Does this mean that the computer is bad/ corroded or a possible short in the wiring/plugs? Hope you can help!
Mr Scanner i was wondering on this test where did you apply COM lead black on battery negative or? And how many W should this resistor have Please and Thank you
love your case study but i wish the premium was open to the bahamas. because its help me alot.just want to say thanks and may god keep you and your family.
I'm sorry Carol, It should be. UA-cam places these restrictions on the paid channels. There is a way around it though and that is by using a VPN scannerdanner.com/forum/scannerdanner-premium/475-access-to-sd-premium-in-non-listed-countries.html
Couldn't you just use a ohm meter from the ground to the Signal with the sensor un-hooked to see if it was sorted to ground before doing Integrity test?
Perhaps someone can help? I am testing on an 08’ caravan and found this video super helpful. When I test the wires for my electronic throttle body, everything seemed fine except the ground shows 2mV and sensor 2 also shows 2mV instead of 5v . Sensor 1 shows 5V. I suppose they are both suppose to show 5V . I did the continuity beep test with my multimeter to ground and it beeps, so I was expecting it to do so on the signal wire with the 2mV reading if it was shorted, but it didn’t. Not sure if I have to do the resistor test here, or if it’s supposed to be that way? Does anyone know?
Hi Paul I have code po2138 po2127 pedal sensor on sentra 08 I thing is a potentiometer like tps sensor if I correct, if is fix to 0 v can I use 5.6k-ohm resistor?.
Hi Paul, using a resistor that really great test I did it and fix the problem, thank you, you have no idea how much I Am learning from you, I Am not a pro but just for the records the owner took his car two times to the dealership end they never fix it, so you did it...
Is it necessary to have the scanner to show the 4.98 volts or can you just read the jumped pin on that side of the resistor? If there is a short will it still read about 5 volts on both sides of the resistor? I have a tps problem and a volt meter but no scan tool like that. P0122 code on a 1996 k1500 Chevy truck.
you need to see what the computer is seeing. If you do not have scan data, you may need to measure directly at the TPS signal wire AT the computer. With the key on and the TPS plugged in, what are the voltage levels on all 3 wires? Then unplug the TPS and measure them again and report the numbers to me
Question, and you can tell me the direction to go Throttle position sensor This is unplugged key in the on position I have 5.01 on the power side The other two both show 7.3 Is that telling me I have no ground and why is my signal wire the same..thanks for any help
I watch your videos which there awesome ..but I’m still lost my tps which is on the throttle body has 8 pins so how the hell im a suppose to find which is which without really damaging everything else like the pcm and such ...and the app has 6 pins which there are no videos out there ..need help ..still working on that same 2002 gm trailblazer ..I don’t know what else to do ..
on an 8 pin electronic throttle body you would most likely have 2 wires for the motor control and then 6 wires for the TPS. TPS 1 and TPS 2, each with a 5v ref, signal and ground just like every other 3-wire potentiometer. Your APP is the same way. APP1 and APP2, each with a 5v ref, signal and a ground just like in this video
I am not sure if that would work, I'll have to try it. I think you body has too much resistance for this test. Certainly there would be no concern with overloading the circuit no matter how long you did the test.
hey when i connect the harness to the air temperature sensor it shuts my engine off but unplugged the car runs normal would you happen to know what this is i’ve replace the sensor and the throttle body and my car still won’t run unless the harness is unplugged
@@tyronearnold963 I'm so sorry, it is hard for me to keep up, especially with follow up comments. I get about a hundred new questions a day, and do my best to answer them and when I do, they just multiply! Anyway, if you still need help, I have created a forum on my website www.scannerdanner.com/forum/post-your-repair-questions-here.html that is free to join, where I have 4 hand picked moderators and over 25k global members who are there to help me help you guys! You will not find a more friendly and helpful forum anywhere. Hope to see you there! Thanks for understanding.
if the signal wire is 0 volts, we put the test light connected to the battery positive instead of giving 5 volts from the reference, would we damage the signal?I'm asking because we might not have a 5kohm resistor and don't want to risk a mistake!!
GREAT videos,man; I will add this,a 5 dollar meter,in ohms,(200) WILL tell you if the signal wire is shorted to GND or not; i do it w/ my old (i mean,over 30yo)IBM 8060A when i have it with me,if not,with anything,starting with a test light(but, N O T ending with it,if is does not light up!); NO need for a 1999 doll.scanner for that simple task; nor for other tasks most of the times.
I've seen broken wires inside the Insulation. Only a few strands of wire were still intact. The system would still pass all test but circuit integrity would still be compromised.
Hi Paul, thank you for the update, I do have a question, I want to buy a used graphic voltage meter vantage, what be the version should I get? or if you please get me some advise.
Awesome ,watching all your videos its really makes me the same as what i am doing, i used more offen jumping methode instead of changing the pcm immediately. We have to disconnect some and add to modify the system. 👍👍👍👍
ScannerDanner. I was having a problem with a 1998 Dakota 2.5 ltr. TPS P0123 high voltage code. I am a retired military veteran as an auto tech. I am ASE Master Auto and truck tech. I watched your You Tube video of the Grand Cherokee TPS no voltage signal problem. The one thing you said helped me to diagnose this dakota. You said " an open or high resistance ground circuit would cause a high signal voltage. I had a broken wire to rear of engine from 02 sensor circuit black wire but all my sensor wires are from pin 4 at ecm. TPS voltages were 5.47 vdc including signal return. Ground resistance was 18k ohm minimum to 33k at all sensors. I could not find were the BLU/BLK ecm ground tied to the black 02 sensor but now all the sensor ground circuit wires back to the ecm are 0.3 ohm. haven't reassembled as of yet but I believe the problem is gone. Thanks for the good info. Rick Larson, RNL Auto Repair Inc., Easley SC
Hey Danner you've got me thinking now could you use a diode instead of a resistor to jump that circuit preventing voltage to come back to the 5 volt reference wire
hi, Opel Astra h 2008 1,3 cdti car accelerator pedal socket pin no:4 51 ohm by adding resistance Does it have any effect on pedal response? Does it affect performance?
i had a vw golf 2005 i was working on and i had a p0222 code. The TPS had 6 wires on it there was a motor built into it to control how much it opens (not cable operated).any videos to show how to test this type of TPS. Thanks in advance
Hi Paul, at 6:48, or at 11:39 , when you have the resistor bridged between 5v and signal wire, what if the signal wire was open( broken), if you do the voltmeter test at resistor you will still get 5v on both sides though (as there is no current hence no voltage drop)? wouldnt you need to do a continuity test as well to make sure that the signal wire is not broken? or just do a continuity test on the signal wire , since we are not doing a voltage drop test anyway? many thanks in advance.
Hey buddy.. What will happen if we remove the throttle position sensor connector and drive the car as usual? I'm stuck with my Fiat Palio's 1.2 (2002) faulty TPS and couldn't find one. Does removing the cable from the sensor and driving the car as usual causes any problem?
dear sir ,i have been with u for sometime now and i have master myself in so many things in ur video and also manage to buy ur Ebook.....i will like to say thank u for the knowledge am acquiring from u.Ur method and style of diagnosis is extremely different and exceptional ..my question for you? 1) can u i use a resistor less or more then 5kohm let say 4.5 or 5.6kokm to the testing? 2) can u do any bypass on the signal wire for the pressure sensors and potentiometer with a test light and look for respond on the scan tool? 3) i was working on a car with check engine light and i pulled a code p0500 which is related to vehicle speed sensor.i located the sensor and it was a three wire sensor,i use multi-meter and check all the three wire and had source voltage,5v and ground.from my testing i know the sensor is a pull down design so i decided to do a bypass test by pulling the signal wire to ground with a test light and it worked and the check engine went of immediately i did the test so i was 100% confident to change the sensor.............please Sir i want to find out if the signal had short to ground could have use the test light to battery positive and watch the test lit?
I have an electronic throttle, i would love to know how to do these tests. It is an Astra 1.8 16V, and I have problems with the signal. the signal is showing 5Volts when the car is off hence, it has failed to start
hm...i was expecting the same for 4. b)...when jumping the TPS signal to TPS ground ...since there is the same concern...if TPS signal wire were SHORTED TO POWER...here s my thinking...if there s power around that is not curbed by that current limiting resistor(as is case with thermistors)...then he or she should stay away from jumper wires and paper clips and stick to test lights and 5kohm resistors...your thoughts mr. scandan?
am a little above average DIY with basic knowledge therefore I find this video very helpful a lot of things make sense now I encourage people to watch it over and over If you need to may look confusing a little but it will make sense scanner danner how can I buy your book?
Hey Paul, thanks for this ... I'm always looking out for guidance on testing and protecting a computer circuit. Question: do all sensing wires back to PCM NOT support current flow at all, or is it just a very very low current?
Parabéns amigo, gostei muito da seriedade e do profissionalismo em que explicou o uso do resistor de 5k ohms na verificação do circuito (chicote central). Agradeço pelos conhecimentos e com isso estrou treinando inglês para um dia poder trabalhar nos USA Abrigado.
@@ScannerDanner Thank you, I was able to figure out the electrical issue on the vehicle I was working on. The catch can was installed pressing on the harness. The catch can was heating the wires.
Great video in fact enjoy all of your videos especially ones pertaining to Hondas and general repair and diagnosis videos which can be applied to most vehicles thanks Artie
That's most likely an electronic throttle body, so 2 of the wires would be for the electric motor and the other 4 wires for the TPS. 5v ref, ground and two signals running opposite each other. TPS1 and TPS2 with one starting low and going high and the other starting high and going low
@@ScannerDanner Gotcha! I'm a transmission guy, although I'm following your video series on circuit design. It all ties together whether you're working on transmissions, or troubleshooting no starts. Thanks for your quick reply, and much thanks for teaching through your extensive video coverage, your videos have been a go to source for myself on numerous occasions.
@@Rick-O-Shay60 awesome, thank you! And to expand on the test light further, if you accidently jump the wrong pins, you'll just light the test light (even on a 5v ref circuit) and you won't pull it all the way to ground.
dumb questions here. 1:can you use an actual fuse also? 2: is yes , what size of fuse ? just wondering in case that i dont have a 5k resistor, i know you mentioned that there is no measurable amperage since the sensing circuit acts as a voltage meter but what if i use a 200 milliamp fuse? if it blows it is shorted to ground , if it doesn't am i good?
Hi Paul If I didnt know if the ECM have a internal resistor or not ,can you measure the ohmage of the ref wire and the signal wire (sensor disconnected) and check the ohmage would it then return a ohmage on a ECM with internal resistor if the wiring was good?
I was wondering if it was common for the 5 volt refernce was on the outside pin and the main ground was on the opposite outside pin with the middle being the computers "eye"? it seems that that would be the common design. I know thats probably not an ironclad rule for every car but i was wondering?
The resistor acts to limit the possible current flow. 5V/5000ohms =.001A = 1ma (milliamp) of current flow,max. (Ohms law says so.) There is virtually no voltage drop across the resistor,because there is virtually no current flow-The signal line should not draw any significant current.
Paul if you use your body to jump the reference to the signal like you did at the beginning of the video should be a valid test,shouldn't it? Besides its not like its gonna be jumpered for hours,when you're doing this test you should have scan data ready, jump it, read scan data and be done with it.
what if I had 2 signal wires, on of them reading 3 volts and the other one 0, and when TB fully open one measures 0 volts and the other one .5, bad TPS?
hey paul,if you look for a 5v reference on any of sensor that is plugged in that circuit,and there is no 5v refenrence,where is the problem from?and also could that lead to a bad mpg in a vehicle
+STEEVE DAVID Nicolas no 5v reference to one sensor or no 5v reference to all the sensors? If it is all of them, the car doesn't start. If it is only one of them you have a break in the 5v ref wire somewhere to that one individual sensor
Just be aware of some variations in design as some of them may still use throttle switches. But if it is for sure a potentiometer type, the testing is identical on literally everything that uses one. Reference voltages may also vary, the standard on most car systems is still 5v
hi, watching video, why don't you use a test light, than if it is shorted to ground it would light up, if its not would still show a voltage on scope, this would protect ecu, this would check for a short or good circuit in one go.
Dan were do you buy your incandescent bulbs for your test light if a blown bulb I can't found them I no there old but hv to ask tnx oh r if anyone read the re no please pm tnx
Are you talking about my red bulb incandescent light? You can find that light and the bulbs on my Amazon store here www.amazon.com/shop/scannerdanner Thank you!
hi this looks very interesting video megustaria watching your videos I wonder if you could talk a bit slower because my language is Spanish and the translator goes way too fast and I can hardly assimilate the video thanks
hi paul is your scan tool in this video connected to the dlc 16 pin connector? i assume it is but dont want to be making mistakes through not asking your advice , keep up the good work son davie scotland
To do that test, one must disconnect the ECM connector and the component and then identify the correct pin or wire at the ECM connector. This is WAY more work than the test I am showing! And no more accurate, just more time consuming.
scannerdanner i am posting from jamaica i would like to know what vehicle is in your ebook the price and how i could get 0ne of the book your videos are excelent
![Pressure Sensor or Potentiometer Signal Fixed at 0v [Circuit Integrity Testing]](http://i.ytimg.com/vi/CkgrMasd57s/mqdefault.jpg)
![Pressure Sensor or Potentiometer Signal Fixed at 0v [Circuit Integrity Testing]](/img/tr.png)
no one is as thorough and meticulous as Paul.....NO one. I watch other repair channels sometimes and I always come back to scannerdanner because no one else on youtube has the level of expertise. I bought your Ebook. it is awesome.
thank you so much!
Yup. There is only one ScannerDanner aka Dan..sorry I mean Paul lol
Absolutely love this whole 5v ref series! It’s so incredibly vital to understand these circuits we work on. you have a very strong passion for the industry and gift for teaching. Thank you Paul, for the unbelievable amount of hours you have invested in teaching others. It’s extremely appreciated by so many! 🤘
Thank you so much!
Bout F*#KIN time!! I highly appreciate people of your caliber, highly appreciate. Confidently utilizing proper automotive terms helps TREMENDOUSLY Sir! Again, HIGHLY appreciated. ..thank you. --Rick
Parabéns amigo, gostei muito da seriedade e do profissionalismo em que explicou o uso do resistor de 5k ohms na verificação do circuito (chicote central). Agradeço pelos conhecimentos e com isso (estou treinando inglês para um dia poder trabalhar nos USA) Abrigado
Thanks man. I've been doing this test for over a decade and never had an issue. I was mainly using it to ensure that the signal wire was not open. After thinking about what would happen if the signal wire was shorted to ground (not common), I felt the need to modify this test.
Go to my website listed on my youtube channel page. I cannot post the link here. The ebook is $49.95 and is NOT vehicle specific. You will have access to the book immediately after purchase no matter where you live in the world. Thanks for your interest.
Yes, but remember some of them all you need to do is unplug it and the signal voltage will already be at 5v. If this is the case you do not need to do the jumper test with the resistor. Also remember this test is used to check signal wire integrity and NOT the sensor itself. Although if the sensor signal is fixed at 0 and unplugged it goes to 5v, this suggests a shorted sensor.
No problem bro. Just want to be as cautious as possible. Especially when we do testing "outside of the box".
I am going to change the ebook to match soon, so look for it.
Hey ScannerDanner I really like watching your videos. I always seem to learn something new. So thank you for sharing your knowledge, and cool test by the way. I think I will use that technique in the future as a safeguard. Watching your video towards the end at around 14:40 when you were going over jumping the 5K ohm resistor between the 5v wire and signal wire. You mentioned how the 5v would not have a voltage drop and be lower on the signal wire because of no current flow, and that it is just going to a voltmeter inside the PCM.
In my mind, I see a series circuit with two loads in it (1 being the 5k resistor, and 2 being the voltmeter itself inside the PCM) The way I see it current should still flow across both loads and the voltage should drop proportionately based on the resistance of each load. So if you have 5v supply and R1 is 5k ohm and R2 is 10,000,000 ohms (typical volt meter internal resistance or so I thought) So doing the ohms law math I came up with about a .049 Volt drop (give or take a few) across the 5k ohm resistor and about a 4.95 volt drop across the meter. Would it not work that way? I think I saw a tiny volt drop when you showed the test around 6:30 in your video. With 5k ohm resistor in place your meter shown 5.01 V on ref side and on the signal side it shown 4.99 V. Would that not be a voltage drop and current flow happening there.
I think having such a high resistance circuit makes the current super super super low, and almost completely gone (really probably not even measurable current, without expensive equipment), but even though the resistance is high in the circuit and the current is low, there are still measurable voltage drops going on in this circuit, I think. Just hard to see it, but if you replaced the 5k ohm resistor in R1 with a 10Mega ohm resistor (something closer to the meter value you would see the voltage drop better). I would think in that case you would be able to see the voltage drop much clearer and have equal or much closer voltage drops across the resistor and meter, probably around 2.5V on each in this circuit.
Anyway just something I was thinking about, and I was curious what your thoughts are on it. Well thanks again for the awesome lesson, I appreciate it. Thumbs up from me. I will be subscribing to your channel and watching more of your videos. Thanks for your time and have a good day sir.
It took me a while to understand what your trying to teach. To make it short-- is the voltage referance wire bad-- or was the potentiometer bad-- or was the return signal wire bad-- --or was the computer bad?? The volatge referance and potentiometer is good because there is 5 volts in and out of the potentiometer as throttal opens. The signal return and computer is good because 5 volts was shown at scope when jumped with a proven 5 volt reference. But the main lesson is>> if the signal reference is shorted to ground and you jump it backwards you could fry the computer.. I am not so sure this true because it all ready might have been shorted to ground. Ampearge is what heats and frys a circut not voltage. This must have been anticipated by the engineer and must have built it circuit protection. If somebody understand this better than me let me know......And Paul did say in 20 years he has never fried a circuit this way.
.
anytime my friend. I never have a problem answering intelligent questions
I have a 1994 pickup with 22re motor, 4 cil, 2wd, no power steering, I have no problem identifying the 5v cable, my tps has 4 pins, how can I identify the signal wire? Another question where do you sell your book?
Another question, can I use a 10k resistor or have to be 5 k?
That test will not work as the PCM will still be plugged in and your ohmmeter can backfeed into other circuits in the PCM causing incorrect readings.
Any Version is fine as what you get with newer ones is newer model year component info. Version 7.0 or 8.0 is the last update for that tool. I have a version 6.0 and I am updated to 2002 model year. This doesn't mean I cannot use the tool on newer cars. I just will not have vehicle specific component info.(best tool I ever bought)
I would if I worked on more of them. I just don't see too many turbo charged cars and when I do, it is the same types of failures that an NA engine has.
Hello, Paul. I love watching your videos. You show us faster and safer way to troubleshoot. I was wandering if I could use a test light, connected to B+ and touch on the Signal wire; test light lights: Short to ground in the signal wire.
That is correct, although I wouldn't call it "large amounts of current"
A typical 5v regulator can only handle around 1 amp of current before it burns up. To the regulator this would be a large amount of current.
👍
KNOWLEDGEABLE Sir ScannerDanner
My Mentor Sir ScannerDanner
From Nick Ayivor from London England UK 🇬🇧 ⏰️ 20:25pm Good Evening
Great videos. Wish I had found you during Covid 2020. I’d have a degree by now in auto tech and repair.
Wow, thanks! I'm glad you're here now. Welcome. Love those who want to learn 🙂
Ok I’m trying to help a single mom with her suv through this covid pandemic it is a 2002 Chevy trailblazer and it is in limp mode the work is free of charge ..but I inclined to the electrical side ..but I really like and understand how you explain things ..where can I buy your book on this tps 5 volt ref. I have figured out how to test the app or the tps on her vehical ..need help !!!!!
Buenísimo enseñanzas como la que usted da no las hay en otro lugar. Eres genial.
You could probably get away with a test light but why put more voltage on the circuit than necessary?
Hey scannerDanner, great vids! Keep up the great work, I am learning a ton! I predict you grow in popularity a TON within a couple of years. I'm subscribed!
Need a process to bench test a throttle body with the tps incorporated in the side of the body.
I have performed resistance test manually operating the butterfly valve but have no way to know what the adequate range is.
Also, does this unit need to be powered up to test properly?
I have 5v in signal wire no matter if connected or not.
Car wont start
Suzuki baleno 1.6l 1996
What to do
Its very tricky when testing it cold and its ok. But when the engine reaches its operating temp and everything gets hot and expands the signal wiring in some old cars gives a higher reading and rpm surges and u think its a vacuum leak. What a wild goose chase i had in a year!!
I have a code P0122
Throttle/Pedal Position what should I fix first the throttle body or the pedal position sensor
im not sure but cant you use multimeter on bother mood to test if there connection between the signal line and ground ?
For a GM 3800 TP do you know the % position and voltage range is when closed?
Under 10% on most and MUST be 0% on some older models
This email address doesn't work. Send me a PM
Exceptional video and teachings concerning wiring of this degree!
Got a question!
I have a 1996 dodge ram 1500 5.2 magnum 4×4
When I remove the plug from the TPS sensor and check the voltage. I have 5.8 volts on the reference wire and 5.7 volts on the signal wire.
Does this mean that the computer is
bad/ corroded or a possible short in the wiring/plugs?
Hope you can help!
This is a little bit high but may not be an issue. What symptoms are you having? What is sensor ground voltage plugged in and backprobing?
Mr Scanner i was wondering on this test where did you apply COM lead black on battery negative or? And how many W should this resistor have Please and Thank you
Not always my friend. I have seen every different configuration so be careful.
love your case study but i wish the premium was open to the bahamas. because its help me alot.just want to say thanks and may god keep you and your family.
I'm sorry Carol, It should be. UA-cam places these restrictions on the paid channels. There is a way around it though and that is by using a VPN
scannerdanner.com/forum/scannerdanner-premium/475-access-to-sd-premium-in-non-listed-countries.html
Thank you so much
i want to be ur friend
Couldn't you just use a ohm meter from the ground to the Signal with the sensor un-hooked to see if it was sorted to ground before doing Integrity test?
+Jared Monroe you could do that but you would get a reading through the sensing circuit, as long as your reading was more than 20k ohms
what about using the powrprobe hooks 5v and jump the signal-ref, instead of the 5kohm resistor? :)
Perhaps someone can help? I am testing on an 08’ caravan and found this video super helpful. When I test the wires for my electronic throttle body, everything seemed fine except the ground shows 2mV and sensor 2 also shows 2mV instead of 5v . Sensor 1 shows 5V. I suppose they are both suppose to show 5V . I did the continuity beep test with my multimeter to ground and it beeps, so I was expecting it to do so on the signal wire with the 2mV reading if it was shorted, but it didn’t. Not sure if I have to do the resistor test here, or if it’s supposed to be that way? Does anyone know?
What codes do you have?
Hi Paul I have code po2138 po2127 pedal sensor on sentra 08 I thing is a potentiometer like tps sensor if I correct, if is fix to 0 v can I use 5.6k-ohm resistor?.
Hi Paul, using a resistor that really great test I did it and fix the problem, thank you, you have no idea how much I Am learning from you, I Am not a pro but just for the records the owner took his car two times to the dealership end they never fix it, so you did it...
Is it necessary to have the scanner to show the 4.98 volts or can you just read the jumped pin on that side of the resistor? If there is a short will it still read about 5 volts on both sides of the resistor? I have a tps problem and a volt meter but no scan tool like that. P0122 code on a 1996 k1500 Chevy truck.
you need to see what the computer is seeing. If you do not have scan data, you may need to measure directly at the TPS signal wire AT the computer. With the key on and the TPS plugged in, what are the voltage levels on all 3 wires? Then unplug the TPS and measure them again and report the numbers to me
Question, and you can tell me the direction to go
Throttle position sensor
This is unplugged key in the on position
I have 5.01 on the power side
The other two both show 7.3
Is that telling me I have no ground and why is my signal wire the same..thanks for any help
You sure that's not 7.3mv?
I watch your videos which there awesome ..but I’m still lost my tps which is on the throttle body has 8 pins so how the hell im a suppose to find which is which without really damaging everything else like the pcm and such ...and the app has 6 pins which there are no videos out there ..need help ..still working on that same 2002 gm trailblazer ..I don’t know what else to do ..
on an 8 pin electronic throttle body you would most likely have 2 wires for the motor control and then 6 wires for the TPS. TPS 1 and TPS 2, each with a 5v ref, signal and ground just like every other 3-wire potentiometer. Your APP is the same way. APP1 and APP2, each with a 5v ref, signal and a ground just like in this video
I am not sure if that would work, I'll have to try it. I think you body has too much resistance for this test. Certainly there would be no concern with overloading the circuit no matter how long you did the test.
hey when i connect the harness to the air temperature sensor it shuts my engine off but unplugged the car runs normal would you happen to know what this is i’ve replace the sensor and the throttle body and my car still won’t run unless the harness is unplugged
i have a code that says intake air pressure sensor 3 circuit high voltage and i have high idle
@@tyronearnold963 I'm so sorry, it is hard for me to keep up, especially with follow up comments. I get about a hundred new questions a day, and do my best to answer them and when I do, they just multiply! Anyway, if you still need help, I have created a forum on my website www.scannerdanner.com/forum/post-your-repair-questions-here.html that is free to join, where I have 4 hand picked moderators and over 25k global members who are there to help me help you guys! You will not find a more friendly and helpful forum anywhere. Hope to see you there! Thanks for understanding.
if the signal wire is 0 volts, we put the test light connected to the battery positive instead of giving 5 volts from the reference, would we damage the signal?I'm asking because we might not have a 5kohm resistor and don't want to risk a mistake!!
I use my incandescent test light for this all the time. Are you a premium member? I have some lectures I want you to watch in my chapter 10 playlist
SUBSTANTIAL Sir ScannerDanner
Thanks 👍 very much helpful video
Sir ScannerDanner
From Nick Ayivor from London England UK 🇬🇧
I have Toyota mark 2 with idle voltage of 4.47 and at fully opened position is 1.45 and this is not normal readings so can I fix this problem
It may be normal, tread carefully. What codes and symptoms? Also what year, make, model and engine?
GREAT videos,man;
I will add this,a 5 dollar meter,in ohms,(200) WILL tell you if the signal wire is shorted to GND or not; i do it w/ my old (i mean,over 30yo)IBM 8060A when i have it with me,if not,with anything,starting with a test light(but, N O T ending with it,if is does not light up!); NO need for a 1999 doll.scanner for that simple task; nor for other tasks most of the times.
I've seen broken wires inside the Insulation. Only a few strands of wire were still intact. The system would still pass all test but circuit integrity would still be compromised.
Yep, as soon as there is vibration and harness movement is when you'd see it
Hi Paul, thank you for the update, I do have a question, I want to buy a used graphic voltage meter vantage, what be the version should I get? or if you please get me some advise.
Awesome! You make it look easy Mr.Danner.
Awesome ,watching all your videos its really makes me the same as what i am doing, i used more offen jumping methode instead of changing the pcm immediately. We have to disconnect some and add to modify the system. 👍👍👍👍
ScannerDanner. I was having a problem with a 1998 Dakota 2.5 ltr. TPS P0123 high voltage code. I am a retired military veteran as an auto tech. I am ASE Master Auto and truck tech. I watched your You Tube video of the Grand Cherokee TPS no voltage signal problem. The one thing you said helped me to diagnose this dakota. You said " an open or high resistance ground circuit would cause a high signal voltage. I had a broken wire to rear of engine from 02 sensor circuit black wire but all my sensor wires are from pin 4 at ecm. TPS voltages were 5.47 vdc including signal return. Ground resistance was 18k ohm minimum to 33k at all sensors. I could not find were the BLU/BLK ecm ground tied to the black 02 sensor but now all the sensor ground circuit wires back to the ecm are 0.3 ohm. haven't reassembled as of yet but I believe the problem is gone. Thanks for the good info. Rick Larson, RNL Auto Repair Inc., Easley SC
to technical for me not interested in a tech school approach want a plain simple answer
Hey Danner you've got me thinking now could you use a diode instead of a resistor to jump that circuit preventing voltage to come back to the 5 volt reference wire
Use an incandescent test light instead. It works perfectly and will also protect the circuit if the signal wire is shorted or if you jump it wrong
hi,
Opel Astra h 2008 1,3 cdti car
accelerator pedal socket pin no:4 51 ohm by adding resistance Does it have any effect on pedal response? Does it affect performance?
i had a vw golf 2005 i was working on and i had a p0222 code. The TPS had 6 wires on it there was a motor built into it to control how much it opens (not cable operated).any videos to show how to test this type of TPS.
Thanks in advance
Hi Paul, at 6:48, or at 11:39 , when you have the resistor bridged between 5v and signal wire, what if the signal wire was open( broken), if you do the voltmeter test at resistor you will still get 5v on both sides though (as there is no current hence no voltage drop)? wouldnt you need to do a continuity test as well to make sure that the signal wire is not broken? or just do a continuity test on the signal wire , since we are not doing a voltage drop test anyway? many thanks in advance.
Hey buddy.. What will happen if we remove the throttle position sensor connector and drive the car as usual? I'm stuck with my Fiat Palio's 1.2 (2002) faulty TPS and couldn't find one. Does removing the cable from the sensor and driving the car as usual causes any problem?
It may not run or shift correctly. But try it is all I can say. There may be a decent backup strategy
@@ScannerDanner Ughhh.. Looks like i don't have an option. Anyways, thanks for the instant response mate!! Really appreciate it..
@@Venkateswaran. good providence my friend
dear sir ,i have been with u for sometime now and i have master myself in so many things in ur video and also manage to buy ur Ebook.....i will like to say thank u for the knowledge am acquiring from u.Ur method and style of diagnosis is extremely different and exceptional ..my question for you? 1) can u i use a resistor less or more then 5kohm let say 4.5 or 5.6kokm to the testing?
2) can u do any bypass on the signal wire for the pressure sensors and potentiometer with a test light and look for respond on the scan tool?
3) i was working on a car with check engine light and i pulled a code p0500 which is related to vehicle speed sensor.i located the sensor and it was a three wire sensor,i use multi-meter and check all the three wire and had source voltage,5v and ground.from my testing i know the sensor is a pull down design so i decided to do a bypass test by pulling the signal wire to ground with a test light and it worked and the check engine went of immediately i did the test so i was 100% confident to change the sensor.............please Sir i want to find out if the signal had short to ground could have use the test light to battery positive and watch the test lit?
Thank you so much for the feedback. I'm am glad to help my friend.
I have an electronic throttle, i would love to know how to do these tests. It is an Astra 1.8 16V, and I have problems with the signal. the signal is showing 5Volts when the car is off hence, it has failed to start
hm...i was expecting the same for 4. b)...when jumping the TPS signal to TPS ground ...since there is the same concern...if TPS signal wire were SHORTED TO POWER...here s my thinking...if there s power around that is not curbed by that current limiting resistor(as is case with thermistors)...then he or she should stay away from jumper wires and paper clips and stick to test lights and 5kohm resistors...your thoughts mr. scandan?
am a little above average DIY with basic knowledge therefore I find this video very helpful a lot of things make sense now I encourage people to watch it over and over If you need to may look confusing a little but it will make sense
scanner danner how can I buy your book?
Thank you! From my website at www.scannerdanner.com
Hey Paul, thanks for this ... I'm always looking out for guidance on testing and protecting a computer circuit. Question: do all sensing wires back to PCM NOT support current flow at all, or is it just a very very low current?
Would jumping the wires with a test light be adequate as a resistor/ buffer??
Yes it would!
Would a 4.7k ohm resistor do the trick. I can't seem to find a 5kohm on amazon.
Yes, or you can use an incandescent test light instead of a resistor
Dumb question but would this test work by jumping the reference wire to the signal wire through a testlight?
It does take times to understand another language.
Parabéns amigo, gostei muito da seriedade e do profissionalismo em que explicou o uso do resistor de 5k ohms na verificação do circuito (chicote central). Agradeço pelos conhecimentos e com isso estrou treinando inglês para um dia poder trabalhar nos USA Abrigado.
"You can get this resistor at RadioShack"
Sorry for this very common question. But what scan tool would you recommend, to see the voltages and voltages moving as you wiggle the wires?
For a pro or DIYer?
The Topdon Phoenix Lite 2 is my favorite under $1k full functional, bi-directional scan tool
@@ScannerDanner Thank you, I was able to figure out the electrical issue on the vehicle I was working on. The catch can was installed pressing on the harness. The catch can was heating the wires.
How can I get a hold of your book you're talking about and how much is it?
From my website at www.scannerdanner.com
Thank you! The eBook is $50 and the paper book is $100
ty so much, bossman at k.d.k performance automotive in orlando will hook me up with that ty
If the return wire is grounded , will the 5kohm resister begin to heat up?
Enjoyed the video.
Thanks for the update Paul!
I'll do it like this for now on.
Thanks again.
need a video on troubleshooting a P1122 code Nissan DTC for E throttle
Great video in fact enjoy all of your videos especially ones pertaining to Hondas and general repair and diagnosis videos which can be applied to most vehicles thanks Artie
What about a 6 pin tps? Specifically 08 ford Taurus
That's most likely an electronic throttle body, so 2 of the wires would be for the electric motor and the other 4 wires for the TPS. 5v ref, ground and two signals running opposite each other. TPS1 and TPS2 with one starting low and going high and the other starting high and going low
yep thank for you reply Paul, and thank for you time.
How do you know if your system HAS a 5k ohm resistor built in? Other than looking at a schematic? I guess I just answered my own question.
It's just the average resistance of an input sensor. I use my incandescent test light these days instead
@@ScannerDanner Gotcha! I'm a transmission guy, although I'm following your video series on circuit design. It all ties together whether you're working on transmissions, or troubleshooting no starts. Thanks for your quick reply, and much thanks for teaching through your extensive video coverage, your videos have been a go to source for myself on numerous occasions.
@@Rick-O-Shay60 awesome, thank you!
And to expand on the test light further, if you accidently jump the wrong pins, you'll just light the test light (even on a 5v ref circuit) and you won't pull it all the way to ground.
I keep watching this video. So awesome and in detail. You are an awesome teacher.
Instead of a resistor, could we not just use a test light as the resistor?
yes sir! I've shown this exact procedure in some of my newer classes.
dumb questions here.
1:can you use an actual fuse also?
2: is yes , what size of fuse ?
just wondering in case that i dont have a 5k resistor, i know you mentioned that there is no measurable amperage since the sensing circuit acts as a voltage meter but what if i use a 200 milliamp fuse? if it blows it is shorted to ground , if it doesn't am i good?
+estrelladelnorte1308 not just 5k resistor ,,,
Hi Paul
If I didnt know if the ECM have a internal resistor or not ,can you measure the ohmage of the ref wire and the signal wire (sensor disconnected) and check the ohmage would it then return a ohmage on a ECM with internal resistor if the wiring was good?
had a sensor that worked but it was loose inside , make car running funny
I was wondering if it was common for the 5 volt refernce was on the outside pin and the main ground was on the opposite outside pin with the middle being the computers "eye"? it seems that that would be the common design. I know thats probably not an ironclad rule for every car but i was wondering?
The resistor acts to limit the possible current flow. 5V/5000ohms =.001A = 1ma (milliamp) of current flow,max. (Ohms law says so.)
There is virtually no voltage drop across the resistor,because there is virtually no current flow-The signal line should not draw any significant current.
Paul if you use your body to jump the reference to the signal like you did at the beginning of the video should be a valid test,shouldn't it? Besides its not like its gonna be jumpered for hours,when you're doing this test you should have scan data ready, jump it, read scan data and be done with it.
what if I had 2 signal wires, on of them reading 3 volts and the other one 0, and when TB fully open one measures 0 volts and the other one .5, bad TPS?
What are you working on? Year, make, model, engine and you need to measure and report all 3 wires for me
Yes it is and thank you
hey paul,if you look for a 5v reference on any of sensor that is plugged in that circuit,and there is no 5v refenrence,where is the problem from?and also could that lead to a bad mpg in a vehicle
+STEEVE DAVID Nicolas no 5v reference to one sensor or no 5v reference to all the sensors? If it is all of them, the car doesn't start. If it is only one of them you have a break in the 5v ref wire somewhere to that one individual sensor
Will this test work on any vehicle whether it is a car or ATV or Side-by-Side?
100%
Just be aware of some variations in design as some of them may still use throttle switches. But if it is for sure a potentiometer type, the testing is identical on literally everything that uses one. Reference voltages may also vary, the standard on most car systems is still 5v
hi, watching video, why don't you use a test light, than if it is shorted to ground it would light up, if its not would still show a voltage on scope, this would protect ecu, this would check for a short or good circuit in one go.
how do you graph this on a vantage mt2400?
Dan were do you buy your incandescent bulbs for your test light if a blown bulb I can't found them I no there old but hv to ask tnx oh r if anyone read the re no please pm tnx
Are you talking about my red bulb incandescent light? You can find that light and the bulbs on my Amazon store here www.amazon.com/shop/scannerdanner Thank you!
hi this looks very interesting video megustaria watching your videos I wonder if you could talk a bit slower because my language is Spanish and the translator goes way too fast and I can hardly assimilate the video thanks
Paul, could a single wire knock sensor that is being pulled to ground on the signal wire cause the same potential risk to electrical components?
no risk with that circuit. in fact there is not much risk even on the reference circuit as they are highly protected.
hi paul is your scan tool in this video connected to the dlc 16 pin connector? i assume it is but dont want to be making mistakes through not asking your advice , keep up the good work son davie scotland
smart but y not just check ohms on the signal wire?
To do that test, one must disconnect the ECM connector and the component and then identify the correct pin or wire at the ECM connector. This is WAY more work than the test I am showing! And no more accurate, just more time consuming.
scannerdanner i am posting from jamaica i would like to know what vehicle is in your ebook the price and how i could get 0ne of the book your videos are excelent
4..7 k resistor easier to find probably any 1_5 k be ok
What color wires go where on position sensor on 3.3 dodge.
not sure offhand. What happened, did a rodent get to the harness?