I was a navy instructor and taught reactor operation and instrument control repair and calibration. Your instruction is on a par with naval training for the reactor controls. Kudos my friend. ET1(SS)
I've had a lot of "HIGH END" training materials, and scanner danners training materials are "HIGH END" as well. He definately demonstraited simple fuel guage Diagnostics in this video, using paper clip at tank connector, jumpering 5 volt reference to harness ground and watching scantool voltage to go from 5v to 0 volts when grounded, proving problem to be towards tank sender unit.Glad that Mr. Danner has made this video and his book available to me and any person who may work on my car some day.
I appreciate the electrical diagnosis videos you have. I have been certified in a few different sub categories as a tech, including advanced electrical diagnosis, but none of my professors came anywhere NEAR as close as you have in making sense out of circuits & showing how the powers/ grounds are switched. I will make sure to tell all my followers about you. Keep it up for the sake of all the younger generation guys who are gonna need to tackle todays advanced vehicles.
Mr. scannerdanner you are absolutely amazing at how you simplify and explain how this things work. I have learned so much from your videos on here & am so thankful for you sharing this with us on here. Thanks again and I hope you are blessed for the work that you do to help people.
Just purchased the book, Really defined, well im in the first section studying stft ltft trims all this critical knowledge for the price is unbelievable!! GET THE BOOK FOLKS !! You will NOT be disappointed,
I like how you are thorough, and informational. Half of my auto teachers at school give half ass answers and just tell me what to do instead of teaching.
God has guide me to you. I can't even speak or write a comment. You are just amazing and I like your character. Recently I bought a tester and a multimeter willing to learn so I'm just a beginner 😅
Go to my website listed on my channel page. I cannot put the link here, but it is scannerdanner d o t c o m. If you have any questions fill out your info on my website and I well get back to you. Also watch my video about my ebook on my channel page. Thank you !
Thanks for this video I have had problems with my fuel gauge on my Integra type R but rather than showing full all the time it tends to go to empty rather quickly so I went on your channel to get the best way to go about it and I can now attack the problem with more confidence Thanks again
What do you call KNOWLEDGEABLE and SUBSTANTIAL the answer is Sir ScannerDanner Brilliant video From the start to finish loved it. Thank you very much helpful information video. Take care and have a great day Sir ScannerDanner From Nick Ayivor from London England UK 🇬🇧
What a perfect video for what I needed. Thank you for breaking this down! I have a 2016 cadillac ats-v and the gas guage doesn't work. hasn't worked since I've owned the car. I thought a new fuel pump would fix the issue; since I wanted to upgrade the fuel system. However it didn't fix the problem. Because of this video, I know exactly what to look for now. High 5 to you and your team!
you are the best! am from jamaica and i watch most of your videos, if not all, best teacher i learn so much, i have so much confidence in diagnosing my car! and i am giving you credit for crank sensor bypass test, wow amazing! circuit integrity test!
Super video. Now I can attempt to diagnosis my sender on my motorhome that reads empty. Like you said, if I disconnect the wire plug at the sending unit, I should read 5v with my meter to ground. Thank you!
Naw man thank you!! If anyone, a diy or even season technician is passionate about there craft and want to have edge over the comp..the stuff u teach is sharp as a razor blade, really defined and simplified. I have no formal training in automotive computer diagnostic.. If I can comprehend anyone can..
My name is Claudionor and I am Brazilian and I have a mechanical workshop make electronic injection repair and'm imprecionado with his explanation. I am very excited about next video where else will perfect my knowledge with them thank you
@foxholewilly It is like that for me! It also feels like that when my students "get it". Thats why I love teaching. Thank you so much for your comment.
ScanerDanner majstore pa ti si Bog! To translate it is :ScannerDanner master you are God :) your videos helped me so much in diagnosing bad wires or sensors etc.By the way i am mechanic working on Renault in Serbia for five years now.I've been so frustrated doing ohm testing that was leading nowhere.Than your voltage drop testing was like a light at the end of the tunnel.I actually solved a problem in 5 minutes that was driving my boss nuts for 2 hours.Thank you.Greetings from Serbia!!!
Thank you for your answer. And you guessed it right. It's an Opel Vectra, so it is a GM product. ;) Oh and congrats on your APSCU's educator of the year, runner up award! I've visited Rosedale's sight yesterday. And 'was looking for information, how I could visit your school. But it seems I'll have to work for a good 5 to 7 years if I wan't to go there to be a student. You would be crying if you'd know how much I earn here in Hungary. But I'm not giving up the hope. I'd truly love to be there.
Truthfully you don't know for sure but I think what you said about the low fuel light makes me feel better about the gauge reading accurately at the lower tank levels. It is common for gauge sending units to have contact issues in only certain places on the resistor. That's what it sounds like to me.
yes. a thermistor circuit will not be damaged by jumping the signal to ground. and they very in resistance from car to car. 30kohms cold is just an example
before condemning the computer you must check the 5 volt reference circuit for shorts to ground. watch my 3 part video on a Jeep with a no start where I am doing just that. if the car still runs and it is only the coolant sensor circuit that is being affected then you must check this circuit for a short to ground before condemning the computer
Danner thank you very much, and look at the continuity of the ground wire, 5v reference. and signal cable from the sensor to PCM all have continuity and this worries me because everything looks OK but the light does not go out and do not want to erase the code it takes to return 30 seconds. or follow all of your videos and you're definitely a great teacher I would love be one of your students
Okay! Great class. I wish my mechanic/Auto mechanic teacher at the local community college can take some lesson from your class and fix my fuel gauge right the first time...after 3 tried and finally seal the leaky gas ring cap after the works being done my gauge now reads 3/4 full after filled up worst then before the fixed which shows 7/8 full when you filled up the tanks. He's now out of idea and don't want to reopen the fuel sending unit tank again because he had to done it 3 times already. Each time fuel still leaks.
The gauge on this is computer controlled and there may be a default position with the signal fixed at 0 or 5. Try using a resistor between the terminals to drop the signal voltage somewhere between 1 and 4 volts. This should result in gauge movement. Remember you may need to cycle the key and clear the code for the gauge to move.
The P0452 code has to do with the fuel tank pressure sensor. It sits on top of the tank unit. These code are not related, but they do share a common ground. It is a common GM fault to have a bad float resistor cause the P0463 DTC
Hi, that's called a voltage divider Vout = (R2/R1+R2)*Vin. Vout is the voltage reading in the scan tool, R2 is the fuel sensor resistor and R1 is the one in the ECM....THANKS.
Thanks for your time, I'll try that and let you know what i find. I should get the truck back first of this week but i remember when the conn. was plugged into the tank voltage was somewhere in the 3v range but the gauge read empty. Don't remember if i cleared codes and cycled key though. Looks like circuitry is working just not to the gauge. tank unit had already been replaced.
@majstorivan84 That is awesome friend! I almost never use an ohmmeter anymore. In fact more times than not the ohmmeter will lead to misdiagnosis. By the way I have Serbian roots on my moms side. It is a small world isn't it? So greeting to you too from the US. A country full of mutts :)
Greetings, thank you for all your videos and information. Can you please elaborate on this comment? Why not use ohmmeter and how it leads to misdiagnosis? If you have a video on this already my apologies. Thanks!
If its a GM, its almost definitely the tank sending unit resistor. The fingers that would make contact with the resistor have poor contact problems and eventually break off.
I love you videos I have a 2005 GMC Astro van my fuel gauge works sometimes for like 2 minutes and then it drops down to empty usually when I accelerate or hit the brakes is it the sending unit or could it possibly be something else thank you keep up the good work you have helped me a lot in the past
no need to watch again, i think i got it now. the voltage was fixed at 5 volts. then you jumped the signal wire to ground (with connector still plugged in) and it dropped to 0 volts. so you pretty much provided a different path to ground thereby bypassing the resistor in the sending unit (since current will flow through the path of least resistance). is that right? also what do you mean by pans when you said "jumping the 2 pans". thanks
Scannerdanner...I did change out sending unit which as stated earlier repaired no start condition but fuel gauge will not work. I know you told me it was the sensor after the test. On the primary pump it is a 4 wire connector ( Power, ground,fuel sens, lo ref) On the secondary unit it has a two wire just fuel level sens and Lo ref. did test as you directed and verus went to "0" on both sensors as i stated. Just trying to give as much info as possible. I have been battling this for weeks and cannot go use parts cannon. form the forums I read most people do and never fix problem including dealerships. thanks
Hello, ScannerDanner, great video, I am getting a P0462 error code in my Lincoln Navigator 2006. my fuel gauge seems accurate with the gasoline in the tank. no gas gauge issues but my check engine light stays on and I cannot pass the state emission test.. when I check with a OBD2 scanner, I have got the Fuel Level Input (PLI) value to 0, I was not able to read the voltage of the Fuel Level. Also the P0462 states Fuel level sensor A circuit low imput, What is the sensor A mean here? is there a sensor B somewhere there? thanks!
If i have the correct info it seems that the Instrument cluster in my Ford Focus controls the fuel level sensor...i am beginning to suspect that my Instrument Cluster is the culprit ?? i had 0 Volts in both the WH/RD and the BN/RD cales...and the display in the IC says Fuel computer data error ??
According to my opinion, Voltmeter placed between the two resistors in series actually measures voltage drop across the second resistor (One towards the ground side)
Voltmeters measure differences in electrical potential between any 2 points in an electrical circuit. (Not necessarily relative to ground) Measurements can be made across any one or combination of resistors.
I'm a second year auto student. I've got a 1998 chevy s10 with no dtc's, fuel gauge reads empty. All tests on sending unit are good. All tests on pcm circuit are good. I can't find a diagram for pcm to gauge in cluster. How do I test the circuit from pcm to the actual gauge? Is it on data bus? This vehicle has multiple gauges that do not work and some that do work. the cluster has been replaced. Any help would be appreciated.
I got absolutely embarrassed on an 05 F250 5.4L gas. I disconnected the connector at the tank and did all kinds of things to the vehicle harness side. Shorted it, left it open, shorted with a 4ohm test light. No matter what the gauge wouldn't change. Except one time when I plugged in a new fuel pump module to the connector I was able to get it to read full. But then it was stuck on full. Would not register any changes. I even pulled the pins out of the dash connector and did all the tests directly to the cluster. Still no changes. It was just a basic potentiometer circuit. Power wire coming from cluster through sender and back to cluster. Nothing else on that circuit. I kept doing similar tests over and over to try and find a mistake in my earlier tests that showed it actually was the sender. I so totally did not want to call the cluster! Getting it fully rebuilt would be $500 our cost... It was electronic and everything else on it worked. We dropped the cluster off at a repair place that said it worked fine. When I picked it up I found out they just moved the gauge via CAN bus messages and didn't actually touch the sender pins that went into the dash. Could there be a bad solder joint from those pins to the cluster module? I hated everything about it. We got a used cluster and of course it didn't make any difference. Long story short I finally found some good documentation on the system that mentioned the gauge operated on a default anti-sloshing mode. Unless you did this specified procedure involving pulling three fuses, cycling key, waiting, plugging back in, etc that it could take up to an hour to register any change... So it was the sender after all. The cluster WAS seeing the changes it was just IGNORING them!!! I kicked myself over that one....
+E Urban oh man, I've been there with the anti slosh modules on Fords. That is something you'll never forget. I'm sorry I didn't mention that variable in this video.
OL-Fault means the system is running in open loop and is usually from an O2 sensor problem or from an overly rich or lean AF ratio. This has nothing to do with your sending unit.
I have a very odd issue with my express van currently. ive gone through every diag in the book (that im aware of) Send wire has 5v, ground is good. multiple brand new sending units, same error. if i operate the float outside of the tank, all gauges work properly. as i am lowering the pump into the tank, all is good. shows correct level and voltage. as soon as the pump is fully seated in the ring, the gauge defaults to empty almost like the float is being held down. i have had my arm in the tank, no obstructions. any idea what i might be missing? when the sending unit is mounted in the tank the voltage says around 2.5v but operates from .7 to 2.5 when sitting outside the tank not submerged. grounds are good, ive had this same issue with 4 diff ecms, 3 pumps, 3 clusters, 2 different wiring harnesses. only thing that has never been swapped out is the tank itself. i even tried running my own ground straight to the tank.
I have an P0460 fault code on my Ford Focus Flexifuel and the wires going in to the tank is GN/OG(Volt) BK(Ground) WH/RD and BN/RD wich i think is the signal wire and signal ground.... Has Ford the same procedure with constant +5V to the signal wire?? really need your advise ;)
In a pinch, can you use the vehicle’s own fuel gauge as the indicator of wiring integrity (instead of the scanner reading 5v/0v) when shorting the sensor signal and ground wires or does the diagnostic code cause the gauge to stop functioning until it’s cleared?
these two gauges have NO direct wiring to sensors, information is shared on a data network. check the fuel level sensor and coolant temp. sensor readings on the engine computer data, if they are good there and not on the cluster, you have a cluster problem
For just over 2 months mine quits working, next day or so works..over and over and over..it's it malfunctioning before fully crapping out, or do I have a ground that is going bad, I know bad stock grounds happen, especially in an 06.. buddy has my multimeter and no scan tool. Just curious. Last thing I wabna do is throw money at a bad ground. Does anyone know the local to the pump/sending unit ground is located?
Replied by bikeril on topic 2018 gmc sierra denali - P0449 code. Just checked each port to ground: red wire reads 12v constant (venting and not venting) white reads 3v when venting and 0v when not venting From the scannerdanner forum. I wonder how we have 3v on the control wire when the solenoid is not commended on? The poster finds some resistance in the control wire. No current flow, no voltage drop.
thx man u helped me a lot with many things...im studying to became a technician i have a year left to go..thx again man..simple and acurate..btw could it be easy to check if u have 5v on the wires ..for the wires integrity check...
Hi scanner that makes sense I was thinking when the gas sloshes around why doesn't the gauge bounce up and down the voltage detction between resisters answers that I imagine it just goes through a logic circuit or something this tells me why the Guage doesn't bounce like a cork on the water it kinda slowly moves to the level in tank
to be honest with you, I do not remember. I think I remember the signal voltage being fixed at 5 volts. and if I remember correctly, I wasn't doing a bypass test I was checking signal circuit integrity. so with the signal voltage fixed at 5 jumping it to ground would be the same thing as jumping the 2 pans together. maybe I need to watch it again when I get time to answer you better
I’ve got a 95 k1500 base with a gauge that’s stuck way past full after a new sending unit. Suspect bad ground or bad sending cable to gauge. Does this year work directly off sending unit or does it pass through ecm first?
hello Danner I have the p0452 code on 99 blazer I found with my own scanner. I put the new sensor and take my blazer to a mechanic who has a scanner like yours and find the code p0463 but not on my scanner the mechanic says that NEED TO assambly unit to resolve the p0452 to pass the test are actually related these two codes? even if the fuel gauge is fine?
Who does this pertain to a 2010 Chevy truck as well if so the orange and black wire I traced it to the map sensor as well because I do not know where it sat on that and e38 computer or can I just grounded in the ground elsewhere
I was a navy instructor and taught reactor operation and instrument control repair and calibration. Your instruction is on a par with naval training for the reactor controls. Kudos my friend. ET1(SS)
That's awesome! Thank you so much
I've had a lot of "HIGH END" training materials, and scanner danners training materials are "HIGH END" as well. He definately demonstraited simple fuel guage Diagnostics in this video, using paper clip at tank connector, jumpering 5 volt reference to harness ground and watching scantool voltage to go from 5v to 0 volts when grounded, proving problem to be towards tank sender unit.Glad that Mr. Danner has made this video and his book available to me and any person who may work on my car some day.
I appreciate the electrical diagnosis videos you have. I have been certified in a few different sub categories as a tech, including advanced electrical diagnosis, but none of my professors came anywhere NEAR as close as you have in making sense out of circuits & showing how the powers/ grounds are switched. I will make sure to tell all my followers about you. Keep it up for the sake of all the younger generation guys who are gonna need to tackle todays advanced vehicles.
Mr. scannerdanner you are absolutely amazing at how you simplify and explain how this things work. I have learned so much from your videos on here & am so thankful for you sharing this with us on here. Thanks again and I hope you are blessed for the work that you do to help people.
Thank you Josh!
2binsons
I never seen a great comprehensive Auto electronic guru like Mr Paul.His books and related videos are really making you a great auto tech.
Eric The Car Guy sent me here! You are DAMN good! Very impressed.
Just purchased the book, Really defined, well im in the first section studying stft ltft trims all this critical knowledge for the price is unbelievable!! GET THE BOOK FOLKS !!
You will NOT be disappointed,
I like how you are thorough, and informational. Half of my auto teachers at school give half ass answers and just tell me what to do instead of teaching.
Electrical 101...always a learning day when you have a s/d video to watch
God has guide me to you.
I can't even speak or write a comment.
You are just amazing and I like your character.
Recently I bought a tester and a multimeter willing to learn so I'm just a beginner 😅
I'm glad The Almighty has my friend. I'll help you however I can.
Go to my website listed on my channel page. I cannot put the link here, but it is scannerdanner d o t c o m.
If you have any questions fill out your info on my website and I well get back to you. Also watch my video about my ebook on my channel page. Thank you !
You are a troubleshooting God! This is something that has boggled my mind about CTS/Fuel sending units for a long time. Thank you!
glad you liked the video. Thanks for watching and for your kind words.
ScannerDanner
How am going to test it on dashboard my nissan almera
Thanks for this video I have had problems with my fuel gauge on my Integra type R but rather than showing full all the time it tends to go to empty rather quickly so I went on your channel to get the best way to go about it and I can now attack the problem with more confidence Thanks again
What do you call KNOWLEDGEABLE and SUBSTANTIAL the answer is Sir ScannerDanner
Brilliant video From the start to finish loved it. Thank you very much helpful information video. Take care and have a great day Sir ScannerDanner
From Nick Ayivor from London England UK 🇬🇧
I actually love this lesson with a great case study. Thanks for enlightening my understanding
Thank you, this information saved us a lot of trouble. Great Work!!!
So much good information my head will explode !!. just doing some review before fixing a friends fuel gauge. thank you
@DIYautotech Thank you! I really appreciate the comment and the word of mouth. Have a great day.
What a perfect video for what I needed. Thank you for breaking this down!
I have a 2016 cadillac ats-v and the gas guage doesn't work. hasn't worked since I've owned the car. I thought a new fuel pump would fix the issue; since I wanted to upgrade the fuel system. However it didn't fix the problem. Because of this video, I know exactly what to look for now. High 5 to you and your team!
you are the best! am from jamaica and i watch most of your videos, if not all, best teacher i learn so much, i have so much confidence in diagnosing my car! and i am giving you credit for crank sensor bypass test, wow amazing! circuit integrity test!
+romie smith thanks romie smith!
Super video. Now I can attempt to diagnosis my sender on my motorhome that reads empty. Like you said, if I disconnect the wire plug at the sending unit, I should read 5v with my meter to ground. Thank you!
Naw man thank you!! If anyone, a diy or even season technician is passionate about there craft and want to have edge over the comp..the stuff u teach is sharp as a razor blade, really defined and simplified. I have no formal training in automotive computer diagnostic.. If I can comprehend anyone can..
your good at explaining how the fuel gauge system works congrats.. and thank u for your help...
SUBSTANTIAL Sir ScannerDanner
Thanks 👍
Sir ScannerDanner
From Nick Ayivor from London England UK 🇬🇧
My name is Claudionor and I am Brazilian and I have a mechanical workshop make electronic injection repair and'm imprecionado with his explanation. I am very excited about next video where else will perfect my knowledge with them thank you
+claudionor jose thanks for subscribing! you've found the right place to be my friend. enjoy
Mann... TOP NOTCH ASE A6 Material Here!!! I am definitely a fan!!!
Thank you so much!
@foxholewilly It is like that for me! It also feels like that when my students "get it". Thats why I love teaching. Thank you so much for your comment.
Wow!!! Thanks ScannerDanner! Great lesson!
ScanerDanner majstore pa ti si Bog! To translate it is :ScannerDanner master you are God :) your videos helped me so much in diagnosing bad wires or sensors etc.By the way i am mechanic working on Renault in Serbia for five years now.I've been so frustrated doing ohm testing that was leading nowhere.Than your voltage drop testing was like a light at the end of the tunnel.I actually solved a problem in 5 minutes that was driving my boss nuts for 2 hours.Thank you.Greetings from Serbia!!!
Thank you for your answer. And you guessed it right. It's an Opel Vectra, so it is a GM product. ;)
Oh and congrats on your APSCU's educator of the year, runner up award!
I've visited Rosedale's sight yesterday. And 'was looking for information, how I could visit your school. But it seems I'll have to work for a good 5 to 7 years if I wan't to go there to be a student. You would be crying if you'd know how much I earn here in Hungary. But I'm not giving up the hope. I'd truly love to be there.
Truthfully you don't know for sure but I think what you said about the low fuel light makes me feel better about the gauge reading accurately at the lower tank levels. It is common for gauge sending units to have contact issues in only certain places on the resistor. That's what it sounds like to me.
I so appreciate your sharing of your tutorial.
Glad it was helpful!
yes. a thermistor circuit will not be damaged by jumping the signal to ground.
and they very in resistance from car to car. 30kohms cold is just an example
You are best teacher
Thank you so much.It's very clear to me now.Please upload more we like you teaching methods.Thank you again.
Thanks very much.for your teaching.
before condemning the computer you must check the 5 volt reference circuit for shorts to ground. watch my 3 part video on a Jeep with a no start where I am doing just that. if the car still runs and it is only the coolant sensor circuit that is being affected then you must check this circuit for a short to ground before condemning the computer
Brilliant explanation. South Africa
Danner thank you very much, and look at the continuity of the ground wire, 5v reference. and signal cable from the sensor to PCM all have continuity and this worries me because everything looks OK but the light does not go out and do not want to erase the code it takes to return 30 seconds. or follow all of your videos and you're definitely a great teacher I would love be one of your students
Okay! Great class. I wish my mechanic/Auto mechanic teacher at the local community college can take some lesson from your class and fix my fuel gauge right the first time...after 3 tried and finally seal the leaky gas ring cap after the works being done my gauge now reads 3/4 full after filled up worst then before the fixed which shows 7/8 full when you filled up the tanks. He's now out of idea and don't want to reopen the fuel sending unit tank again because he had to done it 3 times already. Each time fuel still leaks.
@JohnzCarz Great point, thank you! I didn't check the gauge on this one, I should have.
Most would have called it whit out verifying. That's putting the T in Technical / Technician
amazing!
Great instructor!
The gauge on this is computer controlled and there may be a default position with the signal fixed at 0 or 5. Try using a resistor between the terminals to drop the signal voltage somewhere between 1 and 4 volts. This should result in gauge movement. Remember you may need to cycle the key and clear the code for the gauge to move.
The P0452 code has to do with the fuel tank pressure sensor. It sits on top of the tank unit. These code are not related, but they do share a common ground.
It is a common GM fault to have a bad float resistor cause the P0463 DTC
that's a nice lecture..... Nice Video
check it for a headgasket failure. common problem on this model. also make sure your coolant level is full (when the engine is cold of course).
@MrMatthew1969 Thanks for the comment.
Hi, that's called a voltage divider Vout = (R2/R1+R2)*Vin. Vout is the voltage reading in the scan tool, R2 is the fuel sensor resistor and R1 is the one in the ECM....THANKS.
I've been trying to fix the gas gauge on an old 56 6cyl. Chevy truck since 1995, still workin on it!! Lol
Thanks for your time, I'll try that and let you know what i find. I should get the truck back first of this week but i remember when the conn. was plugged into the tank voltage was somewhere in the 3v range but the gauge read empty. Don't remember if i cleared codes and cycled key though. Looks like circuitry is working just not to the gauge. tank unit had already been replaced.
Perfect, Thank You for all this info!
@majstorivan84 That is awesome friend! I almost never use an ohmmeter anymore. In fact more times than not the ohmmeter will lead to misdiagnosis. By the way I have Serbian roots on my moms side. It is a small world isn't it? So greeting to you too from the US. A country full of mutts :)
Greetings, thank you for all your videos and information. Can you please elaborate on this comment? Why not use ohmmeter and how it leads to misdiagnosis? If you have a video on this already my apologies. Thanks!
@@cristianjuarez8150 Here you go, best example that I have ruclips.net/video/McsNOJvd0ao/видео.html
If its a GM, its almost definitely the tank sending unit resistor. The fingers that would make contact with the resistor have poor contact problems and eventually break off.
Good work
I love you videos I have a 2005 GMC Astro van my fuel gauge works sometimes for like 2 minutes and then it drops down to empty usually when I accelerate or hit the brakes is it the sending unit or could it possibly be something else thank you keep up the good work you have helped me a lot in the past
sending unit, it is a GM and the fingers break off of the wiper that rides on the resistor in the tank
no need to watch again, i think i got it now. the voltage was fixed at 5 volts. then you jumped the signal wire to ground (with connector still plugged in) and it dropped to 0 volts. so you pretty much provided a different path to ground thereby bypassing the resistor in the sending unit (since current will flow through the path of least resistance). is that right? also what do you mean by pans when you said "jumping the 2 pans". thanks
this video my be work for me again thanks dann.
Scannerdanner...I did change out sending unit which as stated earlier repaired no start condition but fuel gauge will not work. I know you told me it was the sensor after the test. On the primary pump it is a 4 wire connector ( Power, ground,fuel sens, lo ref) On the secondary unit it has a two wire just fuel level sens and Lo ref. did test as you directed and verus went to "0" on both sensors as i stated. Just trying to give as much info as possible. I have been battling this for weeks and cannot go use parts cannon. form the forums I read most people do and never fix problem including dealerships. thanks
Excelente explicación, realmente eres bueno en lo que haces.
Hello, ScannerDanner, great video, I am getting a P0462 error code in my Lincoln Navigator 2006. my fuel gauge seems accurate with the gasoline in the tank. no gas gauge issues but my check engine light stays on and I cannot pass the state emission test.. when I check with a OBD2 scanner, I have got the Fuel Level Input (PLI) value to 0, I was not able to read the voltage of the Fuel Level. Also the P0462 states Fuel level sensor A circuit low imput, What is the sensor A mean here? is there a sensor B somewhere there? thanks!
Man your videos pump me up !! Awesome video and info Danner !!!
@fivefortyeye540i Thank you very much for the comment on my book! I owe you one for that.
If i have the correct info it seems that the Instrument cluster in my Ford Focus controls the fuel level sensor...i am beginning to suspect that my Instrument Cluster is the culprit ?? i had 0 Volts in both the WH/RD and the BN/RD cales...and the display in the IC says Fuel computer data error ??
According to my opinion, Voltmeter placed between the two resistors in series actually measures voltage drop across the second resistor (One towards the ground side)
That is correct but the resistor in front of your meter will change what you see too
Voltmeters measure differences in electrical potential between any 2 points in an electrical circuit.
(Not necessarily relative to ground)
Measurements can be made across any one or combination of resistors.
I'm a second year auto student. I've got a 1998 chevy s10 with no dtc's, fuel gauge reads empty. All tests on sending unit are good. All tests on pcm circuit are good. I can't find a diagram for pcm to gauge in cluster. How do I test the circuit from pcm to the actual gauge? Is it on data bus? This vehicle has multiple gauges that do not work and some that do work. the cluster has been replaced. Any help would be appreciated.
Can I use this wiring diagram for a 2002 chevy blazer . 4.3 l engine ?
Yes Paul I like your content absolutely but a quick one can't we have a problem between the computer and the guage? in this scenario
I got absolutely embarrassed on an 05 F250 5.4L gas. I disconnected the connector at the tank and did all kinds of things to the vehicle harness side. Shorted it, left it open, shorted with a 4ohm test light. No matter what the gauge wouldn't change. Except one time when I plugged in a new fuel pump module to the connector I was able to get it to read full. But then it was stuck on full. Would not register any changes. I even pulled the pins out of the dash connector and did all the tests directly to the cluster. Still no changes.
It was just a basic potentiometer circuit. Power wire coming from cluster through sender and back to cluster. Nothing else on that circuit. I kept doing similar tests over and over to try and find a mistake in my earlier tests that showed it actually was the sender. I so totally did not want to call the cluster! Getting it fully rebuilt would be $500 our cost... It was electronic and everything else on it worked. We dropped the cluster off at a repair place that said it worked fine. When I picked it up I found out they just moved the gauge via CAN bus messages and didn't actually touch the sender pins that went into the dash. Could there be a bad solder joint from those pins to the cluster module? I hated everything about it.
We got a used cluster and of course it didn't make any difference. Long story short I finally found some good documentation on the system that mentioned the gauge operated on a default anti-sloshing mode. Unless you did this specified procedure involving pulling three fuses, cycling key, waiting, plugging back in, etc that it could take up to an hour to register any change... So it was the sender after all. The cluster WAS seeing the changes it was just IGNORING them!!!
I kicked myself over that one....
+E Urban oh man, I've been there with the anti slosh modules on Fords. That is something you'll never forget. I'm sorry I didn't mention that variable in this video.
OL-Fault means the system is running in open loop and is usually from an O2 sensor problem or from an overly rich or lean AF ratio. This has nothing to do with your sending unit.
Mr Danner so every thermistor can be jump it without damage the circuit, but thermistor on cars be always 30.000 ohms cold? or can be variable?.
@Bushougoma Great point. Thank you
I have a very odd issue with my express van currently. ive gone through every diag in the book (that im aware of)
Send wire has 5v, ground is good. multiple brand new sending units, same error.
if i operate the float outside of the tank, all gauges work properly. as i am lowering the pump into the tank, all is good. shows correct level and voltage. as soon as the pump is fully seated in the ring, the gauge defaults to empty almost like the float is being held down. i have had my arm in the tank, no obstructions. any idea what i might be missing? when the sending unit is mounted in the tank the voltage says around 2.5v but operates from .7 to 2.5 when sitting outside the tank not submerged. grounds are good, ive had this same issue with 4 diff ecms, 3 pumps, 3 clusters, 2 different wiring harnesses. only thing that has never been swapped out is the tank itself. i even tried running my own ground straight to the tank.
I have an P0460 fault code on my Ford Focus Flexifuel and the wires going in to the tank is GN/OG(Volt) BK(Ground) WH/RD and BN/RD wich i think is the signal wire and signal ground.... Has Ford the same procedure with constant +5V to the signal wire?? really need your advise ;)
Thank you very much!
You are the best man
Enjoyed the video Paul.
In a pinch, can you use the vehicle’s own fuel gauge as the indicator of wiring integrity (instead of the scanner reading 5v/0v) when shorting the sensor signal and ground wires or does the diagnostic code cause the gauge to stop functioning until it’s cleared?
getting truck back tomorrow, will update. No issue with cluster on 09's as far as i'm aware.
these two gauges have NO direct wiring to sensors, information is shared on a data network. check the fuel level sensor and coolant temp. sensor readings on the engine computer data, if they are good there and not on the cluster, you have a cluster problem
For just over 2 months mine quits working, next day or so works..over and over and over..it's it malfunctioning before fully crapping out, or do I have a ground that is going bad, I know bad stock grounds happen, especially in an 06.. buddy has my multimeter and no scan tool. Just curious. Last thing I wabna do is throw money at a bad ground. Does anyone know the local to the pump/sending unit ground is located?
Hey paul. Why is the the fuel gague sending unit only 2 wire instead of 3 wire like every other sensor?
Got an issue with ethanol about fuel floater reading, any idea ?
Replied by bikeril on topic 2018 gmc sierra denali - P0449 code.
Just checked each port to ground:
red wire reads 12v constant (venting and not venting)
white reads 3v when venting and 0v when not venting
From the scannerdanner forum. I wonder how we have 3v on the control wire when the solenoid is not commended on? The poster finds some resistance in the control wire. No current flow, no voltage drop.
Solenoid is open and you're reading a bias voltage coming from the ECM through the control circuit.
ruclips.net/video/Q8ZwxJYkYnc/видео.html
awesome. "your done you need X" I love it.
thx man u helped me a lot with many things...im studying to became a technician i have a year left to go..thx again man..simple and acurate..btw could it be easy to check if u have 5v on the wires ..for the wires integrity check...
i havent tried checking the sensors yet, but i have tried replacing the cluster with the original and it did the exact same thing....
Thank you
hmm, 3v should have shown you something on the gauge. Did you search iATN knowledge base yet? To see if the cluster was a common issue?
Hi scanner that makes sense I was thinking when the gas sloshes around why doesn't the gauge bounce up and down the voltage detction between resisters answers that I imagine it just goes through a logic circuit or something this tells me why the Guage doesn't bounce like a cork on the water it kinda slowly moves to the level in tank
hehe. got it. thanks for the taking the time man. appreciate it. happy new years!
You can have another variable it could be a short from another 5v line to the fuel pump signal.
What you mean another variable
to be honest with you, I do not remember. I think I remember the signal voltage being fixed at 5 volts. and if I remember correctly, I wasn't doing a bypass test I was checking signal circuit integrity. so with the signal voltage fixed at 5 jumping it to ground would be the same thing as jumping the 2 pans together. maybe I need to watch it again when I get time to answer you better
Is it applies to the potentiometer sensor that method Sir
Sir where is the connection of the light that goes to the instrument cluster
You're awesome 👌
I’ve got a 95 k1500 base with a gauge that’s stuck way past full after a new sending unit. Suspect bad ground or bad sending cable to gauge. Does this year work directly off sending unit or does it pass through ecm first?
I think a 95 the sending unit works the gauge directly
help .1995 Astor van my gas gauge read empty all time so change the fuel pump and sending put now it reads full all the time now what can be wrong
hello Danner I have the p0452 code on 99 blazer I found with my own scanner. I put the new sensor and take my blazer to a mechanic who has a scanner like yours and find the code p0463 but not on my scanner the mechanic says that NEED TO assambly unit to resolve the p0452 to pass the test are actually related these two codes? even if the fuel gauge is fine?
Who does this pertain to a 2010 Chevy truck as well if so the orange and black wire I traced it to the map sensor as well because I do not know where it sat on that and e38 computer or can I just grounded in the ground elsewhere