How To Diagnose A Faulty ECU With No Communication

[@edthompson1727]

Man what an informative yet clear dissemination of ECM testing. I am much more cognizant of what is going on with the ecm in my vehicle .

[@danielesquivel2807]

Using this video I found a problem with the ECU cable system that five previous mechanics could not find. Turned out to be a problem with the wire between the main relay and the fuse (the yellow lines at 4:05). Thanks a million :D

[@ardoario4990]

Hi, I’m sorry not very mechanical inclined but I can follow direction, how did you do it? Do you have a video? Thanks for the information.

[@brianchigwenembe3460]

Never have had a well tutorial explanation as this one . Great thanks

[@chrismac2264]

Great video and explanation. I tested my EUC that came with a swap kit for "crank but no start" with your information. After verifying all good grounds, constant 12v, and switched 12v, my EUC failed to pull the constant 12v to ground, allowing the relay to receive a negative signal and switch the relay on and provide power to the other side for boot up.

[@lloyd-qt1mg]

So 'on point' .... no waffling around, thank you. One critique: The ONLY drawback is the "music" that is dubbed in - it creates a strong desire to "Shut off the background noise".

[@NaberAuto]

Great video and information on ECU's and CAN system. The ONLY drawback is the "music" that is dubbed in - it creates a strong desire to "Shut off the background noise".

[@garyr7027]

Nice explanations, unfortunately getting to some connections is the toughest part. It makes what could be a easy job a pain in the ass.

[@jayradcliffe8750]

Tried to go to your website but said it was dodgy and sent me back, wanted to visit after the great video

[@Ecutestinglimited]

Thank you for your interest and we are glad you enjoyed the video! Our website is secured with SSL/TLS encryption, undergoes regular security audits, and complies with data protection regulations to ensure your safety and privacy. You can review our privacy policy here: www.ecutesting.com/privacy-policy/. Please try visiting again at www.ecutesting.com/, and feel free to contact our support team on [phone] if you encounter any issues.

[@kakongebryans8282]

Thanks very much for this well articulated video, am having the same issue with my Audi Q5 2010 ECU is burnt, am wondering the +be line was not fussed?

[@tof3275]

Great video I learned a considerable amount from watching this one video (now subscribed) I have a Maxicue OBD reader and it has thrown up this fault Audi A3 (8P) Convenience system (TP) 01320 intermittent Climate control no communication 00352 intermittent terminal 30a open circuit 0095 intermittent Key 1; adaption limit exceeded Faulty or no basic setting/adaption 01565 Permanent Luggage space lighting Short circuit to ground > The 01565 may now shed some light (sorry about the pun) about the parasitic drain that I could not find. But anyway the car is still driveable. I look forward to your response Tony

[@EyobEyob-lb9wn]

I have autel diagonisis tool somtimes it connot comunicat with the cun bus of

[@brianchigwenembe3460]

Hi I have a problem with my volkswagen passat cc 2011 cluster pannel no lights fans to start the vehicle the dashboard shows only parking light. What would be the problem..sir

[@1waukesha]

Thanks for the advice! Im working on a Bobcat track loader, but I suspect the ecm protocol is likely very similar. These guys had the battery cables come off and shorted, which caused the machine to die. I suspect they fried something, but gotta figure out what

[@howardriley2314]

Most interesting and edifying video.Great job

[@wisdomnecku593]

thanks for this educative video, my automatic transmission has been slipping while driving in 2nd and 3rd, my mechanic scanned the problem with a diagnostic computer and he said there's no communication between the ECM and TCM, he has advised that I replace the ECM. Can a faulty ECM also cause transmission problems?

[@Ecutestinglimited]

Hi. Yes a faulty ECM can cause transmission problems like you are describing, especially if there is no communication between it and the TCM. If your mechanic has diagnosed the problem to be the ECM itself and not the can lines between it and the TCM, then it is likely it needs to be rebuilt or replaced. If you would like your ECM to be tested by us to confirm the fault then please email our technical support team at [e-mail] with the following information. Your make and model of vehicle, the part number printed on your ECM, the symptoms of your fault including fault codes, and any attempted fixes/further diagnostic tests you or your mechanic have completed. They will advise your further. Thanks.

[@vicentegarcia7989]

Well explained !! Ignition switch can be the problem ???

[@palanik1960]

Very good video. Well explained. How to know VCU / ECU is functioning normal.? When connected all device in the CANBUS are good , but there is no way to know ECU is normal or not .

[@Ecutestinglimited]

Hi. We're glad you liked the video! Determining if the ECU or VCU are functioning correctly isn't a straight forward process, especially if they are being effected by an intermittent fault. However the easiest way to identify a fault with them would be to scan the vehicle for any fault codes as these will give a description of where the fault could lie. That being said, some faults don't produce any codes, so another way to test the units are functioning normally would be to use live data monitoring to see how the unit is responding to sensor inputs in real time. Hope this helps!

[@palanik1960]

@@Ecutestinglimited Thanks a lot

[@DanielSmith-jl3in]

This is very helpful as i am experiencing code po600 no communication can high on my 2005 volvo xc90. I will start with the main relay. Thanks

[@aritrasinghachowdhury3227]

Hi, Very nicely explained. Can u pls. advise how various ics of ecu with pinout designation ( eg, Power ic etc) be identified ? Any book or website will be a great help.

[@robertkoza7521]

Incredibly thorough. Great video. Thank you.

[@EugenioDelacruz-zj7tz]

Now this is how an educational video should be made

[@train4905]

A superb video sir,very helpfull.thankyou.steve from the uk.

[@SadewDinuwara]

I changed the engine of my odessey but it displays the errors and it says the problem of ecu,ecm,pcm

[@nickayivor8432]

Thank you very much helpful video 👍 From Nick Ayivor from London England UK 🇬🇧

[@isaacobeng6499]

Thank u for such a sensitive information Pls am having a crank no start problem with my Daewoo matiz 3 I found at that there is no power going to the ignition coil. I don't know what to do now pls help me out

[@AmieeJames-h5l]

Hi E90, cranks but no start + no communication to ecu. Followed your video and everything is fine to the point of having no 12v at 85 with ignition off Whilst having 12v present at 86 Any help would be much appreciated And thanks for the great professional video😅

[@Ecutestinglimited]

Hi. If you are not getting 12v at 85, then there could be a problem with the wiring from the ECU to contact 85 or with the ECU itself. We would recommend inspecting the wiring and connectors/pins first and then continuity testing the wiring to rule it out. If it checks out OK then the fault will potentially lie with the ECU itself. If you would like to send your unit into us for testing to confirm this, please fill in our online test form at www.ecutesting.com. Thanks.

[@francisdsa6790]

Well explained with diagrams and meters to test appreciate and thanks for the efforts.👌👍

[@omarnuman4160]

Thank you for this video, it was very helpful. Please answer this question. Is the engine control unit No. 03G suitable to work in place of the engine control unit No. 038? Knowing that they are the same engine capacity.

[@omarnuman4160]

The car type is Volkswagen Transporter 2007, the engine capacity is 1.9

[@omarnuman4160]

WHAT ENGINE CONTROL MODULE IS SUITABLE FOR 2007 TRANSPORTER 1.9 ENGINE?

[@longhuynh5249]

Wonderful info, my weak battery 12.2V could be the blame.

[@LeoParedes-mm8wy]

This is the best tutorial I have been found and Don't worry about the music play heavy metal if you want viva Mexico cabrones

[@Cas47]

Monka 1600 low mileage Drove parked then 2hrs later no crank no error code, Had RAC out problem with ECU 5amp fault. might be a broken lead due to the very hot weather, towed to Vauxhall for diagnostics. Got to wait till October. Told it will be expensive, could it be the ignition, we had this changed about 3/4 years ago by a different garage.

[@bilalmughal3653]

Very good video. Sir make video. Identify ECM IC . Check ingen , Race , Coil etc . Thanks ❤

[@ragequitrob]

Great video just come across this now. Can i ask what prices are to check an ecu also whats the turnaround speed please

[@Ecutestinglimited]

Hi. Thanks for the kind words, we are glad you found the video helpful! Our current testing fee is £45+VAT and our current turnaround is 2-3 days. This can differ depending on the type of unit you send in, so if you would like further information then please email our technical support team at [e-mail] with the following details: You unit's part number, the make and model of the vehicle it is from, the details of the fault you are experiencing, and a description of any diagnostics already carried out. Thanks

[@صيانةالسياراتعلموخبرة]

does it mean that ECU has power to energize the radiator fan relay even if the engine is off ?

[@khurrammalik2323]

Thank you for a good through and simple explanation. Nice Work

[@danielsanford4109]

thorough

[@thaeermsahib3133]

valuable explanations many thanks from IRAQ

[@coulioouagninnin1297]

Merci très bien expliqué. Du Courage.👍

[@believetatenda1798]

This video really helped me a lot but my only query is that, how do we get 5V on some engine sensors whilst we are using 12V battery

[@Ecutestinglimited]

Hi. We are glad the video was helpful. Sensors which receive 5 volts are typically low-power sensors which only need 5 volts to operate and generate an output signal. These sensors receive their supply from the ECU which has internal voltage regulators to take the 12v supply from the battery and generate different voltages for other components on the vehicle such as sensors.

[@orlanmedina3693]

It checked all out good. Car starts but has a limp mode on it with a "dme internal failure" code in it. But its hard to call up a bad module

[@paulwilliams8993]

Thanks a lot, I have had a problem the car was start first thing in the morning then would have a check engine light on then after the car has been stopped and started for 3 or 4 times the check engine light would disappear I then in my wisdom decided to use electrical contact cleaner made sure it was dry with the airline plug them back in and now. Now I have a Christmas tree and the car is running rough how long will you need to fix and how much

[@TurboBuRick]

1ST AND FORMOST, WHEN KEY IS TURNED TO ON POSITION, THE CHECK ENGINE LIGHT SHOULD TURN ON AND STAY ON UNTIL THE ENGINE IS STARTED.

[@therondismuke5192]

Do you mind explaining the process and reasoning behind 2007-2010 Jeep Grand Cherokee ECM failures there are plenty of videos online of it and most go unresolved

[@paulbecker210]

Hi, I have a Volvo V50 that has problem with anti-skid, the faultcode is ABS-0101, I can switch the car on and off a few times and the fault is no longer present until the engine dtops and is restarted, then the samething is back Our M.O.T. does not like this at all 😢 Do you have any leads where to begin a search? Sinc. Paul

[@junp1594]

i'm one of your subscriber , from Philippines, I like the way your presentation, can you give us a tutorial, on how to open and checking component of ecu and automatic transmission control and repair as well. Thank you sir.

[@rightwingtrashrus274]

You wish😂😂

[@TheWorld-of7dd]

@@rightwingtrashrus274 true😕

[@dereksimenac8844]

Power and grounds should be done with a 2-3 amp test light to ensure connections can handle the required current

[@salascarlosgerardo6070]

First thing.. thanks by share this valuable information; In another hand...I have facing an issue with a Land Rover ECU, during they scanning process is not recognized...I already checked: 1).- CAN Bus lines and they are working well. 2).- ECU voltage and ground feed are fine. They question is....could ECU lost "his" identification" after a short circuit ocurred during the engine replacement??? Your advice is well appreciated.

[@pastmasterdan4080]

You need to have a diagnostic done. Sounds like a burned feed

[@pegasusfly67]

Have a suzuki xl7 that runs great when it's cold but once it been running. That's when I have issues. The speedometer sometimes works,the thermostat started running hot. The engine isn't hot at all. No leaks in the radiator. The engine light has come on, now it doesn't come on. The traction control light came on. Now it doesn't. It shifts hard,slipping, Complete stop then shift hards when going to complete stop. Sometimes it doesn't want to go into gear. Drives great when its cold. Any suggestions?

[@MdRubel-gy8ms]

Hello sir I'm mdrubel mechnice from bangladsh good information thank sir

[@caropsy1428]

Thank you. Very well articulated.

[@rusty911s2]

Excellent: really high quality info, thank you 👍

[@u.s.a.198]

Thank you!

[@niloyu105]

Is there a website or where the website to have available circuit diagram from ECU watching from Al Khafji Saudi Arabia 👍

[@georgeclarke1183]

Great video

[@tipptop9]

Hi guys, very informative video thanks 😊. I have an intermittent no crank on a A4 B8 CAGA TDI. When the car won't start, the main relay (T30) goes bonkers, clicking in and out. Pin 86 and 30 have constant battery voltage when the T30 relay is doing this clicking, pin 85 (ground switch from ecu) has battery voltage until ignition on and then has 1.04v.... I've been over and over the wiring and I can't find any issue. My question is: Should pin 85 drop to 0v as its ground switched by the ECU? This A4 only drops to 1.04v and there perfect continuity on th8s very short wire from pin 85 to ECU, no voltage drop on that wire either. Would very much appreciate a response from your experience 👍

[@Ecutestinglimited]

Hi. We are glad you liked the video. Yes, you are right that pin 85 should drop to 0v with ignition on, so from what you have described it could be a few things. Firstly it could be a faulty relay, have you tried testing/swapping this out to see if it rectifies the fault? If that checks out ok then there could be a short affecting the wire from pin 85. We would recommend disconnecting the ECU connector and testing continuity from terminal 85 and every other terminal on the connector. If there is no continuity, then the last thing to do would be to re-connect the ECU connector and back probe a scope to pin 85 with the ignition on. If the waveform is noisy or the voltage is floating then the ECU is at fault. Hope this helps!

[@tipptop9]

Thanks very much for the reply, it is greatly appreciated 😊. I've tried 5 different relays at T30 position, all exibit the same clicking behaviour. Ive also bypassed the wiring by unplugging the relay, I ran battery voltage to pins 86 and 30 of the relay, i backprobed the ecu and ran a new wire from pin 85 of the relay straight to the ecu. Then i connected pin 87 of the relay into its corresponding socket on the car. Still have the same behaviour. Ive just done your other suggestion and tested continuity from pin 85 an the relay socket to every other wire on the ecu plug, then only place i have continuity is where it should be, at pin 85 termination at ecu! I havent the equipment to scope the signal as you suggest, time to try another ecu i think! Thanks again for your help

[@Ecutestinglimited]

@@tipptop9 No problem, we hope you find the cure for your fault! If you decide you want to get the ECU tested or remanufactured then let us know or visit our website www.ecutesting.com.

[@tipptop9]

Just fitted new ecu from the scrapyard and the problem is gone! The one i fitted is EDC17CP20 same as stock ecu. Car started once and will crank everytime now! The bosch PNs are different though, so not sure i can clone it

[@smlarat58]

My Ford Territory had ECM problems. Had it replaced numerous times. Now the front right brake locks up the wheel. Had the vehicle towed back to the workshop. After 4 weeks in the workshop I still have not been contacted yet. I told them I don't want the car back unless they can guarantee me that the car is Safe to drive. Will probably NEVER get the car back... (NOT HAPPY)

[@dylanwood7810]

Well you bought a ford

[@eric63377]

​​@@dylanwood7810I was going to say the same.

[@SRSpoony]

Hi Tim, i have a ford S max that wont let me clear codes and is limiting power while driiving like 2200rpm and then nothing turbo working drives fine unless you put your foot down and its like its in limp home mode but i can get on the motorway and do 80mph just takes forever. any ideas ? 2008 2.0 tdci titanium. its like its bricked when you lock your mobile with the wrong code in it, turns up but its not doing much. how do i find which version of ECU i have to get 1 from you or send mine back to check it.

[@wisdomnnanna7874]

Thanks for the information

[@thedragonmcpe930mcpe9]

I have a nissan 2007 altima. Radiator fan is always on once engine starts. I did IPDM self test to confim IPDM and relays. And it was good. ECT sensor is good as well. Is there a way check signal from ECU to IPDM?

[@bubba.watercraftj7269]

2009 grand marquis. 44k miles. ABS traction control and parking brake red light went on while driving on highway in rain. Light came on after bump in road. Lights on steady since. Was able to pull a U1900 code with blue driver dongle scan. Missing CAN message from hec. The car runs and drives fine. Speedometer working ok. Cruise control ok. Transmission shifts fine. All readiness monitors ok. Can not communicate through ALDL with Autel maxisys. No communication with PCM, ABS, or dash cluster (gateway module). I am able to communicate with LCM DCM RCM modules. Measured 63 ohms on termination resistance at ALDL and got 12 volts at pin 16 and both grounds at pins 4 and 5 seam ok. Any thoughts would be appreciated. Thanks.

[@Ecutestinglimited]

Hi. Sounds like it is definitely a communication issue. We would recommend using an oscilloscope to check the CAN lines associated with the modules which the fault codes are reporting, checking for any missing signals or inconsistencies. Hope that helps.

[@daviddo3500]

I was wondering if a weak battery could also set code only because in the morning it seems like it has a weak cell in the battery that’s when it went off check engine light and then it starts right up afterwards easily when it’s been running

[@boualambba]

perfect explanations

[@carlkennedy2499]

Hi there. Good video I have a delphi mt05.3 ecu. And when I start my engine with engine light on it starts and dies I have had engine out 5 times and all is good new wire harness and still the same issue 😢 is it the ecu I am thinking of buying a new ecu witch is 160£ but I can get a same ecu but been told it needs matching up with my engine 😮 I don't no wot to do. It is also a efi scooter 125cc 2021

[@ledogogodwin2022]

My golf 4 engine runs smoothly but once or twice in a week it just shut down while in motion. But the moment you start the engine again it starts. What is responsible and runs without hesitation

[@TheSinny]

Have no injector noid. No CAS on this older classic toyota. Everything else looks good What do you reckon?

[@normabradley2544]

great video very informative

[@mohammedabdullah7826]

thanks sir, this is very helpful info.

[@kevins978]

Hi I have a Mondeo 2.0 Zetec petrol. It is showing a p0607 code and a P2110 code which is reported to be a common problem with this model either being the ECU or the throttle body. My throttle body appears to be ok . Could it be any other sensors causing this issue or Will it be the ecu the car goes into engine malfuction immediately the ignition is switched on even though engine is not running when engine running it mifires, Any help would be appreciated . Thank You.

[@train4905]

Superb,presentation

[@keolusmith6011]

Great video. I have a problem. 2013 Tacoma 2.7L, I don't think this is relevant but lightning struck near the vehicle during a storm, truck started the next morning and while driving to town just shut down. No check engine light, cranks but no start, no communication, only with airbag. checked 5volt reference, 2.8 volts at mass air which I thought was not pulling down enough to be a grounded sensor but started disconnecting sensors anyway. of course all disconnected voltage came up to 3 volts but did not return to 5. Is the 2.8 volts at THA wire on maf to high to be a grounded circuit or sensor? Also can bus looks hashed.

[@michaelyeboah201]

Thank you for the video... but i have a problem on my 2008 kia ceed 1.6 diesel engine ECU got blown by touching the positive terminal of the battery ... car wont start again no check engine on dashboard... can a similar ECU be used?

[@Ecutestinglimited]

If it is the ECU thats damaged and you are looking at replacing it then you will need to ensure you have the exact part numbers of the unit matching your current ECU, and you will likely need to code swap data from the old ECU to the new one. Alternatively we may be able to remanufacture your damaged unit, please email your part number to our technical support team on [e-mail] and they will advise you further. Thanks.

[@Daybreaker16]

Hi if the ecu is bad will the ac windows lights still work? My car isn't starting i had cleared a code and shut off the car using a scanner but after that the car isn't starting.

[@oscarcrespo9365]

What is that black little plastic cover for on the ECM. I accidentally removed it. I was swapping an engine and now I have no communication with ECM. Could that be a problem I don't know how to check power and grownds for ECM. Thanks

[@keenobserver9840]

Thanks . I am same issue with merc . Not connecting to ecu , bit as my car is top condition otherwise

[@sirusnickrod8070]

Very sofesticate and compact iducation which requires good basic to understand the all.

[@tomkaraitiana6136]

Awesome very informative info. Thanks bro

[@jillgooch7430]

our nissan juke has undergone a engine rebuild process due to excessive oil usage. the garage is now telling us the engine has been rebuilt but they cannot test drive vehicle because there is a definite problem with the ecu unit and want to send it off to a specialist for diagnosis, at a cost to ourselves. what will this test tell us and do you think we are being fobbed off. so far works have cost us 3500 pounds on our 66 plate juke with 30 thousand miles on clock. please help. yours truly shaun

[@oilpond]

How did you go?

[@azdejnedi2191]

How to check Flexray bus? Did the procedure is same as Can bus testing. Thanks.

[@gunks_getaway]

I have an ECU that the documentation says I should have 3-4vdc on the comm bus. i have 0vdc (flutters in the mV range, about 20 mV). Engine starts and runs fine. What would you check first?

[@lindsaymatiste5370]

My car is starting and when remove my foot from exceleration peddle check engine light come up an no more exceleration.

[@stevenramirez856]

Sound like mine. Im stuck in limp mode. I'm getting a p2138 for a pedal sensor. I checked voltage and it was over 10v at full throttle

[@gideonnyongesa1296]

Look for diagnosis machine for directions , like mine

[@osifosegun4882]

On Hyundai santafe 2014,My check engine light doesn’t come up at all. It doesn’t accelerate when I climb a hill even when the acceleration pedal is completely pressed and the engine does not go off. The fuel consumption is quite enormous as if the fuel is leaking. After diagonising, I have a P0365 (Exaust camshaft position sensor(CMP) B circuit fault (Bank 1). The sensor was checked okay. Even changed. After troubleshooting, it was concluded to change the ECU. What do you suggest?

[@Ecutestinglimited]

Hi. We would recommend checking the wiring in the cam sensor circuit before condemning the ECU, as a short or open in this circuit could lead to the symptoms you are describing and the P0365 code. We have a video on how to do this here: kzbin.info/www/bejne/fIW8YmR_mrx1qc0. If the wiring checks out OK then it is more than likely the fault is being caused by the ECU. If you would like to send your unit into us for testing to confirm this, please fill in our online test form here: myaccount.ecutesting.com/

[@Maskelladam1]

Hi Tim I have a Mini Cooper r56 what says the rear fog lights are faulty, but yet they and all the other lights work

[@junalemania4766]

Good explaination.

[@ryanjess22]

Hi . Do you have any video tutorial for testing ECU using tricore? Appreciate it

[@momohsamson1773]

Thank you very much I have hunda civic and the problem that I'm facing is, my car is working normal but it doesn't move quicke in this situation what do you address me to do thanks

[@Rebecca-k2t]

Thanks.I have a problem with no spark through the 4 ignition even I changed cam and crank sensor,reset timing and also changed relay same sick lie .

[@lekonarodrick6821]

What a great video

[@Eurospec73]

Wow what a really great an informative video. I have a question. I recently just put a rebuilt VR6 in my Volkswagen. Ive had a crank no start/ no spark issue ever since and I haven't even heard the engine run yet unfortunately. I connected the laptop with the VCDS and I have no communication with the ECU I checked all spark, fuel and Air lines and power and grounds everything is fully connected they all look good. I am getting high resistance at the fuel pump. I do not here the fuel pump turn on. Any ideas what it could be?

[@thevisualedge9346]

Have you checked your fuel pump relay? (Relay #67 for the VR6)

[@OlaOlu23]

Please can you do a video on Mercedes w205 no crank , no start. How to trace the ECU wiring diagram

[@jmoore9806]

Do all ECU's have a fues from the car battery to the ECU aka PCM ?

[@yolandfathe2863]

the big idea can this test be done out of car ? get ecu on bench and give it its vss and ignition on vss and ground can we see can communcation signals and relay on low command ?

[@gazjones2238]

Did you change the tps at all.if they fail they can cause erratic idle

[@adahanthony3273]

great video with good explanation. thank you

[@nyutron3862]

Great info, thank you! - I have a question - can a car be wired up to only work with a specific ECU? - My car (golf 2.0 8V) is in at the auto as we speak - it went in with a 2.0 polocub - but he said it has no spark...the way it was previously wired , meant they took a spark from the one loom, and tapped in creating a separate one (yes i had 2, lol ) -and yes it was starting up before it went in - i was just wondering if he tried to up-sell me. Or Could the previous wiring be wired up to "borrow a spark" ? or cause it to "blow" an ECU? - He sold me a 1.8 ECU...for my 2.0 engine, should i be worried? lol , Thank you

[@91GT347]

Almost definitely a different tune at least

[@gerardkavanagh144]

Well presented; Sir. Thank You.

[@erasmusatsu4948]

Nice one thank you

[@oladelesanni4038]

Please can you advise as AA diagnosed my bmw e90 as no communication between ecu and engine but when ignition is on the fuel tank pump continues to run for a long time and also the starter

[@reynaldoclaveria100]

You are best of the best

[@jeffreycamua6761]

Thank you forbthe helpful video,My carkia rio 2013 has no continuity on my 1-2 ecu connection read as ETC MOTOR( +) and ETC motor (-) then no continuity on spark and throttlebody same in radiator fan sensor could you help me?thanks in advance

[@damianbutterworth2434]

I`m trying to create a waveform to test a smart alternator. Mitsubishi. I`ve heard the frequency is 90 hertz on a Ford Focus and duty cycle shout be around 37 to 45 percent. I can not find any information anywhere. This is off a Subaru Impreza. I`ll start off using 5 volt square waves and see how I get on.

[@skipwilson5086]

Sir, I have a question. Is there a single pin, or a couple of pins that "turn on" the voltage regulator to get it (the alternator) to produce power? I'm dealing with a GM CS AD series alternator. I don't have need of anything else other than trying to get the alternator to produce power. ANY help you can give would be appreciated. Thank you.

[@Ecutestinglimited]

Hi. If you want some information on how to test your alternator then check out the video we have made on alternator fault diagnosis: kzbin.info/www/bejne/naGpnYOLZ62Eobs

[@skipwilson5086]

@@Ecutestinglimited is there any way to get away from the ECM, for example changing the voltage regulator to a 2 pin off of an 10SI model?

[@faroukkhan6777]

Thanks for your work 👌

[@boukharitemessek2596]

Hello wonderfully well explained. You say that the ECU should have a permanent 12V battery connection does that mean that even if the key is off the 12V should be present ? or do you mean that on switching on then 12V should be present ? your answer would be much appreciated

[@Ecutestinglimited]

Hi. It would depend on the vehicle, but in most cases the 12v feed would be present even with the ignition off. Hope that helps.

[@boukharitemessek2596]

@@Ecutestinglimited Thanks for the quick response. Had I access to ECU diagrams as the established car mechanics following here your answer would be more than sufficient.I am a private person trying to fix my car it is a SKODA Octavia I break (1U5) 1.6 Petrol (102 hp / 75 kW) and ECU:06A906033BH make: SIEMENS.I am writing this in hope of more precise answer.Thank you. I have krank no start

[@Ecutestinglimited]

@@boukharitemessek2596 Hi. Are you able to scan the vehicle for any fault codes at all? Without these it would be difficult to accurately diagnose the cause of the fault. If you are able to, please email our technical support team at [e-mail] with the results of the diagnostic scan, the make and model of vehicle, and the details of the fault as you have listed above. Cheers.