Exploring the ECU hardware and testing - Part 1 (Hardware circuit demonstration)

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Video Link - Exploring the ECU hardware and testing - Part 2
• Exploring the ECU hard...
Exploring the ECU hardware and testing - Part 1
This video explains the ECU circuit board and demonstrates the way of crank and cam signal simulation to run the ECU and perform the different testing.
The engine ECU controls the injection of the fuel to the engine and the timing of the spark to ignite it. It determines the position of the rotation using a Crankshaft Position Sensor so that the injectors and ignition system are activated at precisely the correct time. It uses also number of sensor to read the status of the engine in order to run the engine at optimum performance.
The input to the ECU includes the following sensors:
Crank Position Sensor
Cam Position Sensor
Knock Sensor
Engine Coolant Temperature Sensor
Manifold Absolute Pressure or MAP Sensor
Mass Air Flow or MAF Sensor
Oxygen/O2/Lambda Sensor
Fuel Pressure Sensor
Engine Speed Sensor
Throttle Position Sensor
The output from the ECU includes the following devices:
Injectors
Throttle body control
Ignition coil
Load relay output
Malfunction lamp
Fuel pump
Idle control

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12 май 2018

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Комментарии : 270

@nismoskys 3 года назад

This is a wonderful explanation and demonstration. You have demystified the inner workings of an ECU for me with the clear diagram shown and by pointing out the components on the real hardware. You also have an excellent method of explanation and teaching. Thank you.

@saudautomation 3 года назад

You are very welcome, this is very good feedback.

@user-lg9tl4tn2e Год назад

مهندسنا الكبير سعود وطنك العربى اوى بمثل هذه الدروس وهذا لايقلل ابدا من شأنك ومكانتك العلميه التى نقدرها جميعا وفقكم الله وسدد خطاكم مهندسنا الكبير

@saudautomation Год назад

حياك الله اخي الكريم، وشكرا لك على الملاحظة، كن على ثقة اني كذلك حريص عل ما ذكرت و هدفي الأساسي من اليوم الأول من فتح القناه هو المساهمة في اثراء المكتبة العربية اولا، اخي كل المقاطع عندي في القناة متوفرة باللغة العربية بلا استثناء و من ضمنها هذا الفيديو فنرجو تصفح القناه لإيجاد الفيديو العربي لهذا الموضوع. و في الحقيقة انا لا أرى ضرر ابدا من تبادل المعرفة باللغات الأخرى كذلك.

@user-ds1nb2uu1m 4 года назад

بارك الله فيك وجزاك خيرا

@rogersy7209 5 лет назад

I also repair ecu for mitsubishi and also planning to build this kind of simulating circuit to test if repair of ecu was successful without the actual efi engine. I'm happy that my planned design was almost same with your ecu tester.... These confirm that my planned circuit will work. Thanks for sharing....Saud.

@saudautomation 5 лет назад

+Roger Sy You are mostly welcome Roger, yes ur right the simulating device is very useful it enables to confirm at least the ECU is accepting the basic inputs then processing and generating the outputs, anyway hopping all the best for you. Thanks

@salehalbanna5716 3 года назад

الله يرضى عنك ويوفقك

@XvS6-Lemaza 3 года назад

الله يسلمك على الشرح السهل و المميز.

@saudautomation 3 года назад

اهلا وسهلا فيك اخي.

@charin2520 3 года назад

Thanks for sharing ECU world.

@saudautomation 3 года назад

Welcome 👍

@kennydoolarchan9515 3 года назад

Your explanation is simple and easy to understand. Please make more videos on ECU and Transmission Control Module.

@saudautomation 3 года назад

Thanks for positive feedback, I will try my best.

@haloomar2906 4 года назад

best explanation about ecu working

@saudautomation 4 года назад

👍Thanks.

@slimali9649 4 года назад

great, you really understand how te ECU work

@saudautomation 4 года назад

👍Thanks.

@RajaKhan-ko7qu 3 года назад

Excellent brother. Great learning classes!

@saudautomation 3 года назад

Thanks for your positive feedback.

@joebaucom4537 2 года назад

Great Job !

@BonJunCuevas 3 года назад

Very informative and learned a lot for a beginner like me. Keep up and produce more videos like this.

@saudautomation 3 года назад

Very welcome.

@nickspua1096 2 года назад

This is what I am looking for, thanks.

@saudautomation 2 года назад

You are very welcome.

@tikottv1291 3 года назад

very clear demonstration

@saudautomation 3 года назад

👍

@LiduaIyaka-mq7bw Год назад

Good teaching

@arnoldmarando2063 2 года назад

Thanks for the presentation. I have an ECU problem of mazda zx 5. The ECU"s circuit got burnt due to a fault in a sensor's terminal to the extent that the processor got spoilt. Please advice...

@syedebadahmed_official6706 4 года назад

Oh men why are you thanking us we should thank you for this experiment too good dude 👌 men 💯

@saudautomation 4 года назад

Most welcome my dear friend , Yes thanks for good feedback. 😊

@theexterminator9207 2 года назад

Say sensor again.....love it

@dedisetiawan-nl3ch 2 года назад

Thank you master for your tutorial. I will follow you till I can self practical. 🙏🙏🙏🙏

@saudautomation 2 года назад

Thanks for your interest to learn and development, for sure as long you have the self driver and willing to know you can reach.

@Hongzbengkelspesialismatic 2 года назад

thank you for the uploaded video, good luck always and always healthy greetings from Indonesia

@saudautomation 2 года назад

You are very welcome, thanks for feedback

@javaidmalik1 5 лет назад

Ohh man your top notch best video ever I have seen in nice explaining thanks for sharing

@saudautomation 5 лет назад

You are most welcome, thanks for feedback .👍

@user-pr2fn2vd8t 6 месяцев назад

Thanks

@ovalwingnut 4 года назад

Enjoyable & informative! P.S. Great 🎥 work. 👍😎

@saudautomation 4 года назад

You are very welcome 👍

@ghislainriou9560 4 года назад

Thank sir for well explained video and to the point. god bless you and salam. Please don't stop making fantastic videos like this........

@saudautomation 4 года назад

Thanks very much fo positive feedback.

@catcaty8868 3 года назад

thanks master saud very nice Explanation

@saudautomation 3 года назад

You are most welcome 👍

@carslover3509 3 года назад

Great explanation thanks sir

@saudautomation 3 года назад

You are very welcome.

@Shark-ye1yj 2 года назад

Thanks.

@bhekiematsebulaboy609 3 года назад

good video thanks

@jundelacruz7641 2 года назад

Hi, car a plug & play be repaired? Thank you for your reply

@nagalakshmiduvvuri2316 3 года назад

thank you sir, your explanation is very good.

@saudautomation 3 года назад

Thanks 👍

@nickluckleek2445 2 года назад

My Peugeot partner 20hdi 2004 crankshaft sensor keeps failing where can I have the ECU tested please help thanks

@iakmenalngkharngi4699 3 года назад

It's a pleasure to watch' your vedios thank you.its give an idea thank you very much

@saudautomation 3 года назад

You are very welcome.

@fiandigital 3 года назад

Please tell me what the black bolt in the middle of the cover ecu? air flow or what this....

@nadeemahmed640 3 года назад

Ma sha Allah Good job

@saudautomation 3 года назад

Thanks for feedback.

@sundarnair6486 4 года назад

Thanks brother

@saudautomation 4 года назад

You are very welcome.

@wolfthequarrelsome504 3 года назад

My Audi A4 got a light bump when it rolled down a hill with the ignition off and struck a wall, scratching the paint work But now the central locking doesn't work and the immobilizer flashing light on the door has stopped working. I now must use the key to open the door but the car operates fine otherwise, except dash shows that the boot is open since the accident. .. which of course it isn't. How could I repair that?

@waseemwaseem1914 4 года назад

Mashallah excellent bro

@saudautomation 4 года назад

Thanks 👍👍

@Bianchi77 3 года назад

do you have port pin out ? thanks

@adnabandasha3201 3 года назад

Well explained Arbab .. hayak Allah

@saudautomation 3 года назад

Thanks 👍

@tughangumus9829 4 года назад

O my good nice video 👏👏👏

@saudautomation 4 года назад

Thanks for your good feedback.

@diloojee786 2 года назад

Please ford 150 ecu how check it and not showing check light

@amerengineervechle8879 4 года назад

Thanks for yuo this vedew vary good thankyuo

@saudautomation 4 года назад

👍👍Most welcome

@rebaimourad1000 2 года назад

Hallo friend Could you please explain me the errors message displayed on my SAM afet dg shatdown : ⠀

@garryarrivado5152 3 года назад

Thanks sir

@wa4aos 4 года назад

Very good information. Could you do a video using a scope and logic probe, then look at signals through a microcontroller board. Data, Address, Control lines and show some common fault conditions like a data line being held low. Other examples of faults would be good as well. Thank you for your videos and the best to you in 2020.

@saudautomation 4 года назад

Thanks for good feedback, In fact that vedio is already available in my channel, which is covering troubleshooting microprocessors and microcontroller circuits in details. Please check the following title (Advance troubleshooting of microprocessor and microcontroller circuits using oscilloscope.)

@evansbidali5883 4 года назад

I love your videos. I am interested in tutorials on ecu repair for Mercedes actross trucks

@saudautomation 4 года назад

👍Thanks for good feedback.

@MrBathuu 3 года назад

thanks nice lessons please do more videos programming chip and tunings

@saudautomation 2 года назад

Thanks, I will try my best.

@budipriyatno5853 4 года назад

hi, from ECU's connection diagram in your video, i didn't see connection from immobilizer, in many car equipped with immo, if we try to turn on / ignition the car with 'foreign' key, the car will not send data from immo to ECU, so the car will not start. Is that true? or you have the different opinion, please explain it to me..thanks

@saudautomation 4 года назад

Hi, Thanks for the good point. The inputs provided in the diagram was example of basic parameters to ECU as simplified schetch only. Indeed you are right immobilizer system is one of inputs to ECU this can be external transponder ECU in some designs or integrated in the ECU, if non authorized key used then received security code will mismatch to the one saved in ECU eeprom and engine won't start. In fact there is other inputs also like status of gear if neutral or park, brake padle pressed status, IGF for ignition feedback in some cases.

@reload1531 Год назад

i do have a question, when you are simulating cam and crank signals, i know that before the pcm will work the injectors and ignition, it will be looking for specific patterns of the crank and cam, and how they are synced. how are you accomplishing this/ THANK YOU.

@saudautomation Год назад

Hi, Your point is very valid and correct, in fact what I think in this type of simulation the ECU hardware and program is just reacting to the input signal and not genarating timed output, it keeps trying to adjust the output all the time , this semulation signal is at low RPM and the ECU is not fully functioning and in fact this helping us just to get the output and check the ECU respond, not only that but we can get the injector and ignition output only by providing the crank signal alone without cam signal and also it is giving the output eventhogh the immobilizer is not disabled, I know if you use a semulation device like MST 9000 the ECU generates more timed output signal.

@kaungaatewau1750 3 года назад

Thank you for your video, I'm interested. My car Toyota Passo 2006 have a problem with immoboliser as the light was sometimes blinking or unable to start. I need some help cos we don't have any dealer in my country Kiribati. Is it possible to change an ecu with a non-immobolised type?

@saudautomation 3 года назад

You are very welcome, There is different ways to deal with this, but first step don't forget to try start by spare key if you have. 1-Try to reset the ECU, by erasing the eeprom data you will need at least some eeprom programmer to do this, then after that you need to register the key again by following key registration procedures you can serch for the procedure forms the web based on your car modle. 2-If you suspect the ECU is defictive, then you can try to clone the eeprom on new ECU, just by removing the eeprom (this is ic with 8 pins) from faulty ECU and use it to replace the same eeprom at new ECU. 3- try to do immobilizer off or delete but you will need programmer and some computer application to do this. All the best

@scottfirman 3 года назад

I found an exploded capacitor in mine. At this point, I have to guess it was one of two used as smoothing capacitors, mabe even a backup. Someone had replaced two of them and reversed polarity on one. It was a low voltage cap. As it didnt affect anything, my guess is it might be for OBD2 power supply or something none critical.

@abnad2827 9 месяцев назад

Hello, and thank you for the video, it’s excellent and informative. I have a 2012 Volkswagen, the multimedia radio, the interior light and the sunroof no longer work but everything else works perfectly. The diagnosis tells me there is a control module fault with the code: 1048642. How can I repair this fault? Is it the soft out The hardware that is at fault? Thanks a lot for your help.

@michaellantajo7542 Год назад

Good day sir im from philippines im interested to repair ecu what books i must read

@ibnhasan5248 Месяц назад

thank you bro, very informative video. May I ask if you have a pdf doc. about repairing ECM?

@wilfredbotha7667 3 года назад

Excellent sir where can i go for a training course on ecu repairing?

@sametalici877 Год назад

Hello can you repair continental getrag dc4 tcm

@imranrizvi8006 4 года назад

Hello Sir i need f6a t/c 2wd 4at 33920-74G8 1denso ecm pinout wiring diagram plz

@ALONSOIBARRA1967 4 года назад

thank you man. go head

@saudautomation 4 года назад

👍Most welcome.

@yaovidossou7571 4 года назад

Hi I have an ECU for ssangyong rexton year 2004 I need to repair how can I do

@yaovidossou7571 4 года назад

Or can I you find me an used ECU to replace?

@nooretautaya 4 года назад

Assalamoualaikoum. I have a burnt ECU for Audi A6 allroad. Do you offer repairs service?

@heatherrhodge2588 4 года назад

You're awesome! My ecu got corroded BAD and one of the ic chips was ruined to the point that one of the legs just crumbled off! I can't find any info on what the chip does. None of the numbers pull up anything when I Google any combination of them!

@happynyoung 3 года назад

Take multimeter and check the voltage of the one of the ic similar to that ic which is ruined then check the reading and start exploring which ic has the same reading and detach the ic from the other chip then installed the chip into your mother board simple 🔥

@peterfrancis3865 Год назад

Nice

@SujarwokoWoko-vb1lq 25 дней назад

Master, tell me how to make an ECU simulator for the electronic circuit wiring, thank you

@mudassaraliali1993 3 года назад

Masha Allah

@saudautomation 3 года назад

Thanks

@marvinlamis 3 года назад

Thank you sir for this video... (request) aircondition ecu function?

@saudautomation 3 года назад

Thanks and very welcome, Sure I will try in future.

@mohidinotani3579 3 года назад

Thanks sair if you please what car ecu you are working

@saudautomation 3 года назад

This was for Mitsubishi Lancer engine control unit.

@felix941010 3 года назад

good day Mr. Saud I'm very admire the creativity of your testing platform is it ok to ask what or how is the crank & cam generator work?

@saudautomation 3 года назад

Hi, good day for you as well and welcome for any question.👍 In fact the one I am using is based on costomized mechanical mechanisms plus some electronics to condition the signals. This type of simulators can be built based on different principles, it can be pulse genarate circuit using 555 timer ic for example or other circuits.

@felix941010 2 года назад

@@saudautomation if possible i would love to try your method! im very impressed by the simplicity of it LOVE YOUR CONTENT !!!!!

@sujarwoko8431 Год назад

please master for the circuit schematic for the ac simulator test kit, I hope the master is always healthy

@Lashbabu 5 лет назад

nice and informative video, plz make more video on ecu

@saudautomation 5 лет назад

Welcome 👍

@modoucamara1301 5 лет назад

@@saudautomation nice video do you give any training programmes if available please sent me your contact details or you can write me Modoucamara106@gmail.com thank you

@saudautomation 5 лет назад

😊Thanks.

@saudautomation 5 лет назад

@@modoucamara1301 Your most welcome. Thanks

@dineshkarki600 3 года назад

How to make this devise

@kapilanawarathne5746 3 года назад

I have doubt that i am using a obd scanner (ELM327) for diagnostics of car. Which can send errors to my mobile via bluetooth. its a very cheap one and i don't know whether the acuracy of its operation. The question is. Will it affect to ECU Put into dawn or lower performance.

@saudautomation 3 года назад

No worries technically the ECU is not affected by the connected scanner unless the change is commanded by the scanner operator or it can be ECU hacking activity, regardles cheap or expensive scanner.

@shanemike9906 3 года назад

hallo sir. can i send my ecu to your shop to repair? my mechanic says my ecu didn't send power to my nozzle to pump out fuel. i can't fired my car. they've already check the fuel pump and scan everything was fine.

@willisochieng8977 5 лет назад

Interesting. I would love such a setup to use on BMW ECUs but how would one deal with immobilizer ?

@saudautomation 5 лет назад

Hi, thanks for feedback. Yes the immobilizer part is challengeable not only BMW but most of other cars, some time like number of Toyota ECU's they require ignitor confirmation feadback (IGF) signal and ECU will not also respond without it. All this permissives signals sometime they make difference and sometime not.

@MakerTools 3 года назад

@@saudautomation I'm using an EWS deleted/ immobilizer bypassed ECU for a BMW z3. Sometimes it fires ignition, sometimes not... I just read what you wrote about ignitor confirmation...and wondered if it's happening here.? Car is 2000, so twenty years old, maybe they didn't have it then? Anyway... intermittent behaviors are always hardest, aren't they, lol?! Maybe has to do with 5v being ok on air temp sensor but 12v is read on mass air sensor and also on coolant temp sensor?! Seems sensors would all be 5v? Such an interesting world...lol.

@joe-jr4pu 3 года назад

Where is the igniter driver on a md354635 ecu

@jameslivingston8650 3 года назад

What is the orange vertical component t 4:10 in this video? Upper left part of the ECM board near the 5v power transistor. This component appears damaged (overheated?) on my ECM.

@saudautomation 3 года назад

Hi, Yes that component normally called (hybrid integrated circuit) so it contains IC plus some other parts forming small circuit board packed in ceramic.

@jameslivingston8650 3 года назад

@@saudautomation Thank you for that info. I have some numbers off of it, but have not been able to find any source for this. Do you have any recommendation as to where I should look for this component?

@saudautomation 3 года назад

Yes this are very costomized components and not easy to get unless you have the detailed part number, try try to communicate with the car agency if they will help.

@jameslivingston8650 3 года назад

@@saudautomation Understood. I have sourced a used ECM that will make my truck run smoothly, but it is for a 6 cyl version of my 4 cylinder engine. I put it in today, and it ran pretty well (they both use inline Fuel Injection pumps, so I don't have to worry about 6 vs 4 cylinders). The boards and pinout are the same, but with the replacement ECM in, it runs at about twice the speed it should at idle (I think the gear that the speed sensor senses is a different size). I don't have Schematics, but I do have all the pinout and the functions of each connector pin. Could I correspond with you to see if I could find a way to solve my problem? Perhaps by email? I have recently purchased a power supply, oscilloscope, and have a diesel engine simulator arriving soon. Thx!!

@mehboobalam6956 3 года назад

Sir,Your all tutorials are full of knowledge like you are giving a Hadia of Zahab!!!!!! I have a question, that on any ckt weather it is a control unit or bcm,how I will came to know that this particular portion is faulty.Do i have to go step by step stage wise, like to check any convention ckt. Apart from getting the fault code. your keen advise is required.

@saudautomation 3 года назад

Hi, Depending on the failure mode and fault different troubleshooting approach and technique can be flawed, I for example the complete unit is dead and not responding then I can start to check the supply voltage and the healthness of main microcontroller, but if two or three outputs are not working then I check what is the common component meeting them and replace if required, If one output is no working I start tracing from that output pin going down I keep checking all the components on the way until I get the faulty one. Some test I need to keep the unit off powered and sometime it should be powered on depending.

@LiduaIyaka-mq7bw Год назад

Please sir how can I get that device you develop the give the Crank signals

@saudautomation 11 месяцев назад

Hi you are very welcome, Thanks for your interest, but this a prototype developed for my own use.

@rasidahharun785 3 года назад

Hi My hiace cannot start cos ecu s got problem. Now we odered for a new one from Japan on Mei, untill now there is no news when it will come to Malaysia. So is it true, it only from Japan, or we can repair it. Can you give any suggestion to fix the poroblem. My hiace manufactured year 2013 Cc 2.8 and patrol fuel. Hopping you help me, please

@saudautomation 3 года назад

Hi, I believe you can discuss with your dealer about this, Repairing is normally possible but depending on the failure so not every fault is repairable, as long you already ordered new ECU then that's fine always new ECU is more reliable at all the cases compared to repaird one.

@dinkaman2160pukka 2 года назад

thank you so much! where r u based? I need to get my ECU checked, cleaned and capacitors replaced.

@saudautomation 2 года назад

You are most welcome, I am from Oman.

@zeyadrhadi2285 2 года назад

حياك الله

@saudautomation 2 года назад

حياك الله، واهلا بك.

@mdwajeed5172 11 месяцев назад

Hello sir I'm from India

@elnaracosta8956 2 года назад

sir I am one of your subscriber her in Philippine. You have a great video. Can I send my ECU for testing and repair. It has no com when scanned. The vehicle was partially flooded, but we already clean every sensor and necessaru parts. At first it start and engine run but after several days it just crank and no start.

@abukawsar5357 3 года назад

Asalamulaikum. Sir, I have qustion. How to identity eeprom in the car ecu......?

@saudautomation 3 года назад

Alaikum Aslaam, eeprom you can find it normally close to the microcontroller it's 8 pins ic with part number it can be either 93Cxx, 24cxx, LRxx or RAxx ... etc. Not all ECU's using external eeprom sometime this is embedded in the microcontroller.

@luchmunramesur2471 3 года назад

Hi sir, could you please tell me where i can download or buy schematic circuit diagram for ecus

@saudautomation 3 года назад

Hi, If you mean ECU pinout then sometimes you can just search for ECU part number at the web, Or try free software like Carmina std available, Alldata software is paid professional software. But if you mean electronics board circuit diagram that's not easy.

@saudautomation 3 года назад

Hi, If you mean ECU pinout then sometimes you can just search for ECU part number at the web, Or try free software like Carmin std available, Alldata software is paid professional software. But if you mean electronics board circuit diagram that's not easy.

@bobbylong4443 2 года назад

Wow

@abdulrehmankhattak729 3 года назад

nissan accent2010 ecu coil driver how test demo

@ivanxavi2620 2 года назад

The link under video i cant c it pliz

@saudautomation 2 года назад

It is there, at the vedio description.

@joshuayovo5220 Год назад

Hello sir pls do you train people ?? Am interested to learn it

@saudautomation Год назад

Hello, thanks for your interest to learn more, currently I just exchange knowledge through the vedios.

@imamimam-pr1em 3 года назад

Assalamualaikum Sir 👍 From India 🇮🇳🇮🇳🇮🇳

@saudautomation 3 года назад

Hi, Very welcome 👍

@joelsarmientoaresgado2290 4 года назад

Very very nice and educatioanl,, thank you my friend for sharing your knowledge, bless you more,, Just want ask how you made your ecu, ckp,cam signal simulator??? Do you have a diagram or a video how you made it Thanks so much more powee mu friend

@saudautomation 4 года назад

Hi, Very welcome and thanks for feedback. Regarding the ckp, cam semulator device, most of work is done by mechanical mechanism , the electronic part is only conditioning the signa, beside this is still under development.

@joelsarmientoaresgado2290 3 года назад

@@saudautomation hi ,can you send me an diagram for this my friend if its ok to you,, thank you very much

@joelsarmientoaresgado2290 3 года назад

@@saudautomation this is my email joelsarmientoaresgado@gmail.com

@pathumsahan8372 8 дней назад

how can i buy crank and cam simulation , electro mechanical bord with equipment

@abuzarbaig3116 3 года назад

assalamualaikum from where can i learn about ecu please guide me

@saudautomation 3 года назад

AlaikumAslaam, Through basic electronics plus continuous practice and hands-on.

@boybravo689 3 года назад

Sir may I know if a pcm,bcm,ecm are integrated into one computer box? Forgive me for my ignorance coz I don't have any training in electronics school.tnx sir

@saudautomation 3 года назад

Hi, ECM (engine control module) and ECU (engine control unit) they do the same reading the sensors and controlling the engine. PCM ( powertrain control module) combine the engine control and transmission control in one unit.

@boybravo689 3 года назад

@@saudautomation Tnx sir for that information

@mstafasarwat3274 2 месяца назад

❤

@franciscosilva2252 3 года назад

Hi, I would like to do a complete course with you, is it possible and how is it possible?

@saudautomation 3 года назад

Hi, and thanks for your interest, In fact I don't do any courses, just the avaliable vedios in the channel.

@akshayraveendharan2733 3 года назад

Sir if I connect vehicle battery connected wrong like +ve and - cables connect opposite which part of ic effect please tell me sir

@saudautomation 3 года назад

Hi, Good and important question, In fact most ECU circuit implement diode protection at power input, this with different arengment, sometimes the diode is just connected in reverse so anode to ground therfore if battery power was reversed heavy current pass across the diode and fuse blow. Sometimes the diode is connected forward direction to just block the reverse power also some circuits implements 2 back to back diodes, you can see sometimes mosfet is used to block the reverse power. Anyway if the fuse was slow to blow the reverse power will negtivly afect the ECU circuit, diodes and electric capacitors plus regulator might fail but if the reverse voltage spike reaches the microcontroller or other IC's then for sure microcontroller chip cannot tolerate that most of time and just fail.

@akshayraveendharan2733 3 года назад

@@saudautomation thanks for responding my question 🙏 and how can I identified effect diode or moseft

@saudautomation 3 года назад

Depending on the failure , is it the ECU not responding and failed totally, at least are you hearing the fuel pump starting after ignition on this can be one indication of ECU status , are you getting the 12 volt reaching the ECU normal after the power reversing, is it blowing the fuse, the protection diode will be close to the 12 B+ input pin. Anyway different posebilites can be there you need to check.

@akshayraveendharan2733 3 года назад

@@saudautomation sir can you give me your what's app number,?

@saudautomation 3 года назад

saudautomation@gmail.com