How to test a 3 wire sensor and circuit - simple tools.

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Here we show you a quick and easy way to test a 3 wire sensor and it's wiring with basic tools. There are variables to this test.
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Steve
* Disclaimer: Neither Simply Diagnostics, SimplyDiag Network Ltd, nor Steve Scott accept any liability for any loss, injury or damage to any person, property or vehicle as a result of techniques, tools or methods shown on this channel. Always follow the manufacturers instructions and abide by all local and national laws regarding safe working and environmental hazards*

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Опубликовано:

19 дек 2021

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Комментарии : 106

@loneyndlovu1353 9 месяцев назад

A classic and smooth flowing tutorial. I will always shout for some more!

@rennautomotiveltd997 2 года назад

Great to see you back on RU-vid Steve! Nice simple and informative video Look forward to getting back up to the hub next year 👍

@ismarmeskovic 2 года назад

Good to see you in action again Steve!Thanks for the lesson 👍

@stuartwood3258 2 года назад

Thanks for the videos mate. I'm a mechanic that's trying to improving in electrical diagnosis and scope use and find your videos very informative!

@devilspawn0797 2 года назад

Great to see you back at it mate. Suffering with tooth ache that day but didn’t realise I was pulling such funny faces 😂. Was a top day. Hope to catch up soon👍

@Divided-Kingdom 2 года назад

Recognise that voice anywhere! See you on the next installment of the diag tech course mate 👍

@sollykhan2385 11 месяцев назад

AWESOME video, thank you for posting, that workshops well equipped, i wish mine were like that!! please keep up the great work, well appreciated 🙂

@d.d4184 2 года назад

Brilliant to see you back

@mikechiodetti4482 2 года назад

Then comes the intermittent problems. Still, your way is a quick check for circuit integrity. Merry Christmas and Happy New Year!

@lozmarks 2 года назад

Awesome to see you back Steve. Keep posting 👊

@sollykhan2385 23 дня назад

Thank you posting this very helpful video, please continue , also where can i get all the wiring diagrams from? , i have older AutoData but they are essentially useless, as do not cover many models and predominately for older cars.

@marion1600 2 года назад

Great video! That signal wire integrity testing method is really quick and clever.

@simonrawle7885 2 года назад

good to have you back mate . noticed on the wiring diagram one is pull up and one is pull down

@SimplyDiagnostics 2 года назад

Well spotted, I was keeping it simple for this video 👍

@IAMNOSLEEP 2 года назад

Great to see you Steve. Merry Christmas & Best of the New Year when it arrives. Thanks for sharing... Cheers.

@vanhap Год назад

very good video, explains everything thank you for sharing

@DJTourniquet 2 года назад

This is absolute gold

@chriholt 2 года назад

Great to see new videos!

@lane1962 2 года назад

Very informative, thank you for sharing.

@eugenetdi6102 2 года назад

Sweet, 👍 enjoying watching your videos.

@robertmobileman8304 2 года назад

good to see ya back on youtube , great video ,hope ya well , nice one steve

@stevehayes6661 2 года назад

Awesome knowledge mate another excellent video

@petersockett9542 2 года назад

Thanks Steve, merry Christmas

@kennedysgarage3281 2 года назад

Great video Steve, great to see new content 🙏👍

@grabovg 2 года назад

What a great video I hope you have a merry Christmas

@7minnow 2 года назад

Great job mate

@simonilett998 2 года назад

Great to see you back Steve. I was only just thinking last week..'We haven't seen Steve for quite a while' You must've been a busy man. Have a great Xmas and New Year mate👍🇦🇺

@stevegordon3336 2 года назад

Great tutorial well explained

@LondonCarnaval 2 года назад

Awesome video 👌 👌 as usual. Thank you for sharing it with us . Have very Happy Xmas and well deserved break 👍👍👍👏👏👏✌❤🍀☘

@russellmcallister6830 2 года назад

Brilliant having wiring on the big telly steve

@michaelpiecewicz9748 2 года назад

Great to see sir.

@williamgagnonroadboxservice 2 года назад

Good to see you mate Please have a wonderful Merry Christmas and be safe That darn bug is kicking butt in the UK and USA

@danielwoodhouse1870 Год назад

Brilliant thanks!

@Lambros_Stefaneas 2 года назад

Glad to see you back, with one more great video. Ì was thinking couple of weeks before,that we haven't seen you for long time, I checked your channel, and I was unsubscribe!!!!!! Of course, I subscribed again immediately, but someone told me that if one channel haven't upload a video for long time, the RU-vid by itself, start to unsubscribe people from that channel. I don't really know if it's true, I just leave this comment, maybe some other people, had the same issue.

@georgebonney90 2 года назад

Thank u sir👍

@CubasAutomotive 2 года назад

Hey Steve!!! So great to see a new video from you! What an amazing setup! Love to see you doing well my friend! Sending big hugs & love! Merry Christmas to you and the family! 🎄⛄🎅 🤶 ❄ 🎁 🤗🤗

@SimplyDiagnostics 2 года назад

Thanks Cuba, good to be back, merry Christmas to you and yours 👍

@johnbickle4654 2 года назад

Great tutorial Boss . now when is the next one!

@safebarbell 2 года назад

Excellent video! I've got a Smart CDI 45 bhp which I was ripped off on. Got various issues but can't get to the bottom of them. Mainly low flow at the egr and an iat circuit code. Car drops into limp mode constantly. Got a new egr and enough vacuum to lift it and no vacuum leaks. However, I've back probed the MAF and have 4.99V ignition on engine off at the loom side. Plugged in the volts drop to 2.32 ignition on. Start the car and the volts are 3.66 at idle. 3.4 volts at 2K revs and 3.1 volts at 3K revs. At idle my reader displays 6 g/s which seems high for a 799cc engine. Got any ideas please? Cheers.

@urbanjentry222 2 года назад

Good to see you on my screen again you have been missed very much in my opinion

@wesleydeer889 10 месяцев назад

damn impressive shop,

@JS-ri2rx Год назад

How are you plugged in for the live data? I have a P0190 intermittent fault. J have 5v Nd ground. No volts on ignition on from the connector but when engine started between 1-× volts. Car usually can do 4 miles then fault. The 3 pin sensor at times stops showing the readings hence the fault but im lost how to fix it

@matheist5968 Год назад

Hello there is this the same for Hondas or more specific Honda S2000 crank sensor? Best regards!

@colinwilson1585 2 года назад

Great video and well explained. Just a note some vehicles also use digital sensors for pressure using changes in frequency instead of voltage changes.

@SimplyDiagnostics 2 года назад

Indeed they do, we also have sensors now using the SENT protocol that is a digital data signal and not frequency. This is where rule No1 comes in: What am I testing?

@colinwilson1585 2 года назад

@@SimplyDiagnostics yes I have seen/diagnosed these before, 100% agree we need to know and understand the circuits we are working on. Again great explanations cheers 👍

@johnbickle4654 Год назад

HI I have a 2009 vx astra 1.4 petrol car had misfire hole burnt centre of no 3 piston fitted new piston chain kit etc had 1 code stored for lambda bank 1 sensor 1 circuit new sensor has fixed that fault any quick easy test i could do to make sure the car is not over fuelling car is starting running spot on atm but little apprehensive to take it out on the road any advice greatly appreciated 👍

@mikeyp1977 2 года назад

Steve lad. Been a while 👍🏻

@budj7898 Год назад

Great video, only bit I don't really understand is bat positive to the signal through the test light. This shows 5v on live data but is this actually 12v but the ecu can only read as high as 5v?

@liamhotspur9182 9 месяцев назад

I can only guess but it seems to be a analog sensor, so it was just at the upper limit because it was equal or more than 5V and the ECU doesn't care about higher voltage.

@educationaltvshows9950 2 месяца назад

Scary sht. Might fry an ecu in some cars? Dropping 12v into 5v line?

@drivewasher 2 года назад

You can also pull bias voltage down with your finger one hand on bias and one on chassis/ ground

@SimplyDiagnostics 2 года назад

EricO style 👍

@planet1250 2 года назад

Hi Steve

@richardpinson1234 2 года назад

Why does signal wire only show 5 volts when it’s plugged in to 12 battery volts please scratching my head , awesome to see you back

@SimplyDiagnostics 2 года назад

Purely because it's programmed to see 5v as the upper limit and therefore shows it as it's max value. Hope this helps. 👍

@richardpinson1234 2 года назад

Yes thank you glad to see you back

@972johnmoreno 7 месяцев назад

What if your signal wire is less than 5 V? Dodge caliber signal volt is 3 V

@mattt4183 2 года назад

Don't really need the DMM so long as you've got an incandescent test light that'll glow at 5 volts. Has to be incandescent because some pull down signal circuits will flow enough current to light an LED.

@SimplyDiagnostics 2 года назад

Exactly 👍

@HaroonKhan-qc7nm 2 года назад

Hi there Just want to ask. What voltage should you have on signal with KOEO. I thought it should be 0.5v or there abouts Thank you As always great video showing test methods

@SimplyDiagnostics 2 года назад

Hi Haroon, it depends on application, each case is different.

@fastbagel993 Год назад

Great video thanks, nice refresher. Had a question if you are missing the 5v reference can you supply the sensor with 12v instead of 5 from battery positive and now see if the sensor works? to sell the time to find out why the ref is missing and confirm sensor is ok. Did it recently with a voltage generator to supply the 5v and that worked but wondering about making that test easier when a voltage generator isnt handy.

@DDR233 Год назад

No, you’ll likely fry drivers or devices

@fastbagel993 Год назад

Thanks I bought a little hand held voltage generator so I’ll use that when it happens

@SimplyDiagnostics Год назад

I wouldn't recommend, safer to do it through a testlight or a 5v low amp supply specifically designed for the job.

@fastbagel993 Год назад

Great thanks yep I bought a portable voltage generator can do 20ma 0-10v should be good for it

@offbeatwarble Месяц назад

@@SimplyDiagnosticsCan I ask how does using a test light make it safe to put 12v in to a 5v circuit so it doesn't fry ecm?

@leftyspinn 2 года назад

Do you have the 5v limiting adapter on the power probe battery clip for your test light?

@SimplyDiagnostics 2 года назад

No Mark, the testlight acts as a current limiting device so for this particular application its relatively safe.

@j.gains_mtb6823 11 месяцев назад

Whats the benefit of this compared to backprobing? Or are tou trying to see if the sensor its self is pulling the bias down? Also would like to know where to grab them test leads they look a good job

@SimplyDiagnostics 11 месяцев назад

Great question, back probes can introduce a pin fitment variable, my test leads are either from the hubitools kit available from Diagnostic Connections or the breakout kits from Warwick test supplies. 👍

@j.gains_mtb6823 11 месяцев назад

@@SimplyDiagnostics awesome thanks for that pal

@mikeadler434 Год назад

👍👍

@daveyraveyv8 2 года назад

Good to have ya back can u send a link to the test light you used on ya amazon shop plse Steve

@SimplyDiagnostics 2 года назад

www.amazon.co.uk/shop/simplydiagnostics

@daveyraveyv8 2 года назад

@@SimplyDiagnostics is it the otc 3633?

@SimplyDiagnostics 2 года назад

There are 2 OTC and a cheaper version

@daveyraveyv8 2 года назад

@@SimplyDiagnostics is the otc one you used on that test the number i gave plse Steve?

@SimplyDiagnostics 2 года назад

No mate, it was the cheap chinese one

@ADDAUTOMOBILESERVICES 2 года назад

👍

@marklongson304 Год назад

Hello. Can you help me please. I’m trying to test the 5V circuit of a Sprinter Van, EDC16. How can I check the ECU is working ok? What I’ve done is place a load in the circuit 2K ohms, same as ten boost sensor, the voltage pulls down to 3.5v, does that mean it’s faulty?

@mubirukadiri6686 Год назад

Where and how can i get wiring diagramthanks stev

@gulag8735 Год назад

If you've s bm-trouble-u.......you'll find the diagrams on tyres ista software. If you've expensive diagnostic equipment they'll be in that. If you've none of the above.....internet

@user-yw9qj4dm3t 2 года назад

سلام زمان مانشرت وين هل غيبة

@johnmorton5498 2 года назад

Why is the signal value showing 5v on the screen when it's got 12v up it backside?

@SimplyDiagnostics 2 года назад

Great question, the ECU is programmed to evaluate up to 5v so even though the voltage is higher it will register a maximum of 5v. There are variations to this but this is the norm for most.

@johnmorton5498 2 года назад

@@SimplyDiagnostics lovely, so it's safe to feed 12v into the ecu when checking the signal wire by watching the signal value. I've literally just changed a 3 wire sensor this morning, the old faulty exhaust back pressure sensor on the mazda 2.2 skyactive engine, it's now got the mazda upgrade sensor kit on it. Anyways one more thing, is the 150ma incandescent bulb test light categorically safe to use to test the signal wire to the ecu, there's no chance of over loading the ecu on that pin.

@SimplyDiagnostics 2 года назад

Personally I've never had an issue doing this with my testlamps. Check the current draw of your testlight before trying it. 150mA "should" be safe on most circuits - there are exceptions.

@alexmessina3383 2 года назад

I understand the theory, but I always feel some trepidation about plugging a 12v source into a signal wire back to PCM; less so if ground Vref or bias ... for the signal wire, this circuit carry very little detectable current via the sensor resistor ... 120mA light may make possible a100X the kind of current the wire may carry ... Do you think there may be any concerns justified? And do you think this would work with, say, a 30mA digital light??

@SimplyDiagnostics 2 года назад

I've personally never had an issue and no, an LED or digital light isn't a big enough load to pull down some bias voltages so may skew the test.

@alexmessina3383 2 года назад

@@SimplyDiagnostics Excellent vid nontheless and very valuable to keep the test in the toolkit. Thank you!

@SaidAhmad-yh3rh 4 месяца назад

So the signal must be 5volt

@lucasellyson6872 9 месяцев назад

In a nutshell, what exactly is bias voltage?

@SimplyDiagnostics 9 месяцев назад

Bias is a virtually zero current voltage on a circuit that an ECU can use to detect a circuit fault ie open or short.

@stu8538 5 месяцев назад

@@SimplyDiagnosticsalso called pull up voltage and is why the ecm will throw a “voltage above normal” when the sensor is unplugged (6.5 bias voltage on a 5 v reference sensor). Because the bias voltage is higher than expected?