Renault Modus 1.5dci not starting, ECU no communication. Fault finding and repair. 

Intermittent problems is a pain but your thought process and comprehensive testing is always spot on mate 👍👍👍👍

Thanks for this Luis, it's brilliant that you dissect the suspect part to prove your diagnosis. Genius.

I have 2-3 monts ago one modus with exactly the same behavior. Intermittently no crank no start, immo ligh on, no com, fan on... I saw that probably is missing power suply on engine ecu. So I look at diagrams and backpin engine ecu connector first and boom 3 volts and fluctuating up and down. So I find that same relay is bad. This relays are garbage. Funy is that, in my case is also missing a vin number and someone was there before me. When I gave the car back to the custumer, custumer told me that previus guy replace engine ecu. God job Luis as always and thank you for the video.

Well done Luis! I really enjoyed that one. I was a bit worried when you were, but i knew you will made this to happened.

Changed the relay and car works. You are a godsend thank you.

Greetings from South Africa - I got someone coming in the morning to have a look and I am going to give him pointers from this video. I bought a non-runner. Fan kicks in when you switch it on, engine light ofcourse, cranks once then does not until a minute or so when it allows you to retry. No glow plug light as well. It does pump diesel though. Weird thing though when you try to crank it only cranks for like 1 second then cuts out. Anyway I am hoping for the best when the guy comes in and I am also hoping I can solve the issue before tomorrow because I have a feeling this guy is going to charge me big time and not find the issue straight away but this video helps

you are the best mechanic in the UNIVERSE

You are the Sherlock Holmes of cars :) thanks for another excellent video, I watched every second of it.

The difference in the relays is that one has an internal protection diode. If memory serves, on this type of fusebox, the +ve feed to the relay coil is the opposite way round in 1 or 2 of the sockets. So if you put the relay with the diode in that particular socket the +ve feed to the relay coil will be switched to GND through the diode and not the coil - BOOM! Superb design by Renault. In the factory manual it does say we are not supposed to change faulty relays but replace the UPC. Normally the UPC rots to death on these anyway. I've seen 2 types of PCB and they are not interchangeable if trying to repair. With the right PCB swapping the 93c46 from old to new swaps the config without issue. I get a lot of SMD transistor faults on these as well.

I just did a Kia Soul with no brake lights Same type of relay controlled the ESS system and was gone Love your vids Learn and Earn !

Good job again. Nice to see you. 👌🖐

Thank you for another great video!!!

Well done sir.superb testing.

Another great video much appreciated

Good Job Luis. I like dci problems because I have a clio campus dci with Delphi ddcr ecu and I do all possible experiences in this car. Configuration, reprogramming, boost, egr on off but I failed to replace the original ecu ddcr with another one dcm because power difference bad loom. Best continuation

Like your way to solve such issues sir ...thks to teach us the points to do ..

Fantastic you work👍

Great video i have a smilar problem with my modus dci. kills engine sometimes on the road it is a nightmare i will check it with your video. Thanks a lot

Thank You a lot. Very good work.

Nice job... Good luck

Great man! Thank you so much!

Goed work thanks for video's

Great find! Luckily, this time it was a simple & cheap fix! In the wrong hands, it could've been much more. Hope all is well Luis! 😊😊🤗🤗

Great work

Good Job 👍

Mate, i am just going through this problem as i had to replace the clutch and when i put everything back together the car didn't start... But because i am just starting to learn about electric i just managed to check the voltage on the fueses and on the red once (10v) i don't have power going through.. So i definitely know something it's wrong in that fuse box. In the next couple of days i will look to see if i got the same problem as yours. Thank you for this video

Thank you for the great video. Where do you get diagrams from any cars? Thanks

Perfect, thanks 👍

I said before and say that again great videos

Well done you.

You do a lot of Renault, great for you, but glad I don't own one😅

Hi which software do you use to find wiring diagrams please?

Thank you Luis. Is that problem relay known as a 03-14 A-Type NAiS Relay 4-Pin

good job

This is exactly what my 1.5 clio dci is doing which relay do I need as same problem your help would be very much appreciated 🙏

Super 👌

Good catch ! Luis it's not video related but i would like to know more about you (your story) and about your little motorcycle, seen in the 2019-2020 video you made

We're did you get your renault diagrams from thanks

Hi LM, Where could I find the ECU pin out for a 2013 clio 1.5 DCi?

Thanks for the video, I was just wondering why u replaced that second black relay (the one that wasn't clicking) with the white one?

great video as allways thanks for sharing . where do i get wiring diagramme for a clio 3 thanks again

Oo ... welldone Luis, that was a hard one i think !!! very good diagnostic work. So, did the owner change engine ECU without program the configuration and VIN ?? hmm ... thanks for sharing

Great video that I wish was around in early 2018! Had the almost the exact same issue with my 2008 Megane 1.5 dci, apart from it wasn't intermittent, just one morning it wouldn't start but would turn on the fan. Couldnt find any info at the time so had a car electrician come out who had a poke around and diagnosed the issue, saying the ECU wasn't getting any power. He didnt fix it but said 'This white cable needs power' which I took literally and essentially hotwired to the battery with a fuse and a switch in the cabin, obviously I know nothing about car electrics but its worked every since - providing i remember to turn off the cabin switch! I've always thought it was odd that a single cable broken but if your issue is the same as mine I wonder if I'm just bipassing a bad relay. What was the relay you replaced? And was it just in the fuse box? Many thanks, Nathan

Informative video. Thank you. I am experiencing same low pressure warning , beeping and fan running. My mechanic is puzzled since this fault is intermittent but I managed to get the fault to reoccur by sitting in the car and shaking from side to side. I tried to see which relay you identified as faulty but couldn't. Could you tell me which one please. Thank you kindly.

Very clever, who would have thought. I have been locked out of audio functions (bass, treble, left right fader and front to back fader) on a 2007 Peugeot 207 GTI 1.6 Turbo. The last time it let me in, i thought i'd experiment with the bass setting and set it to max. All i get now on the dash are 2 options under the 'audio' menu with nothing greyed out. FM band preferences and Audio CD preferences. Any suggestions...i searched your channel but am thinking of disconnecting the battery for a few seconds , please and thank you.

Nice

Bons videos Luís, nao é todos os dias que se encontra uma pessoa como tu! Podes fazer um video dos equipamentos de diagnóstico que utilizas? Obrigado

Grazie per questo bel video dettagliato. Io anche recentemente ho avuto questo problema. E ho provveduto a cambiare anche l'intera ecu con una nuova. Ovviamente ho dovuto clonarla. La cosa che però non mi spiego è: Perche il messaggio dice anomalia pressione olio quando invece il problema e la mancata comunicazione fra upc e ecu? Ho detto correttamente? Oppure sto sbagliando? Fammi sapere. Grazie comunque! 😄👋🏻

Hi Louis, Dies the clip unit also support Nissan consult as well as the Renault software? Getting straight answer from Chinese seller is such a pain. Thanks

hello, does anyone have the wiring diagram of the connectors of the Renault Modus engine control unit, as in the video? Thanks

Hi L And M I've replaced my relay and it's fan comes on and immobiliser light stuck on solid no more clicking though does it need reprogram please can you help as don't have much money an5 information please

I will let you know tomorrow if it works

Excellent video Luis, I like the logical way you work through problems. Could you suggest a fix or point me in the right direction to solve an intermittent starting fault on my sisters 2004 Modus 1.5Dci, K9K engine. The car has never failed to start, but it almost never starts first turn of the key, the engine usually starts after 2 to 3 attempts, on some occasions it can take 10 plus attempts to start the engine, temperature and and ambient air temperature don't make any difference, the car has been to a Diesel fuel system specialist that told us nothing is wrong with the fuel system high or low pressure delivery to the injectors, the injector leak back test was normal for a engine with 120,000 miles on it, I have yet to find a solution. Any help you might be able to give would be very appreciated, thanks for all your videos they are a big help and entertaining 👍.

Hi, My modus has a similar problem. After a bit of driving all the warning lights flash up and I lose use of the headlights and indicators (and probably others) and then that usually stops after a minute or two and instead it flashes up the spanner and both airbag warnings. If I stop the car and restart the screens load up normal again but it will happen again after a bit of driving. The garage have no idea what it could be. I had the battery replaced but it hasn't helped. Do you think it could be a similar issue to yours? Also, do you know where the earth cables are? Someone said I should check those.

Boas amigo mais um problema resolvido eu aqui em Portugal vejo me aflito para arranjar os diagramas seja do k for e sempre um castigo mas muito bom grande abraço amigo ca do portuga

Hi Luis! Can you advise me please where to dig in, I have no power to glow plug relay on Nissan Juke 1.5dci 2014? In the summer engine starts and works perfect, when cold-doesn't start at all, computer diagnostic shows error- preheat relay circuit. maybe you can tell me which relay or fuse gives power to glow plug relay? Thx

Olá, antes de mais, parabéns pelo video. Sabe onde posso encontrar o esquema eléctrico de um clio 2 1.5dci 2003? Parece-me ter um problema parecido. Abraço e continuação

👍👍👍

Hi luis. I have a same car 1.6 petrol l. I have a similar problem. My car does not start sometime. You know when you turn the ignition on all the locks operate at the same time plus the immobiliser light comes on. Sometime the airbag light comes on. Any idea what it could be? Could it be any fuses that causing ths issue?

Hi, very informative video. I have same issue of continuous bleeping noise. Main ingnition relay circuit fault identified. I have replaced the main fuse box and located faulty relay as second from the right top row. However when I replace this B marked relay I have no crank or engine start, only lights up and fan comes on with warning of Low oil pressure and battery charge fault. I've tried swapping relays one by one. It's definitely the same relay but I'm stuck as no engine Start when relay has been replaced. Any help with this would be appreciated as im really stuck on what to do?

Hello , i have renault modus 2008 tip tronic gearbox , sometimes it wont go to the N nd to 1 in Automatic , can someone help me with this ?

👏👏👏👏👏👏

So was the problem the relay?

Hi, quick question , nearly all my fuse box is corroded , especially cable jacks..if i replace the fuse box is gonna make any difference..i keep getting errors on wipers(starts moving) when i signal left,right or long beam..

1st boom

hello i want to ask you which relay you change because i don't see nice in the video

Hello Sir! First wanna say thank you from Sweden and then I have a question! I bought a Renault megane2 1.6 16v manual, the problem is on this car is no crank no start! When I try to push the start button just Radiator fan start to run nothing happen! Can guess what is the problem?

Olá Luís. Temos um modus que tem um problema em que a bomba de combustível está sempre a trabalhar mesmo depois do motor desligado acabando por drenar a bateria. Alguém sugestão? Tentamos trocar o relay2 como no vídeo por outro igual mas usado e o carro não pega. Só com o relay anterior. Obrigado.

The relay is not working. But I did not understand what specifically is not working in it? Burnt contact? Perhaps because English is not my native language ... I look with interest!

I had exactly the same problem, same symptoms. I changed the relay ,but it Still doesnt work, i changed the upc, doesnt work... im crying

Just stick a paperclip inbetween pin 30 and 87 on the relay. Voila!

What relay is the white relay then please a or b please you didn't say what relay the white relay was

Hi i have a modus that if u leave overnight starts fine in morning most days but leaving it for 40mins or so it will slow start where is cranks and and cranks for about 40 seconds to a minute had a computer plugged in but has not thrown anything that says what it could be could u perhaps some how get in touch or help me on hear with it please

maybe a burn contact inside relay

Boas Luís. Acho que tenho o mesmo problema no meu Modus. O problema é que não sei que relé devo comprar. Na Renault só têm para venda a caixa toda por uns 300€. Podes dar uma ajuda? Precisava de uma referencia, site e características do relé. Uma abraço e obrigado

open the relay to investigate more.

This sign appears from time to time and I do not want to start the engine

I have DF067 I have replaced the ecu kit, and still the same. But before it opened, my friend tried to open my ecu Edc17c42 to remap and broken a ceramic capacitor and joint two legs of chip 40076 bosch. And he try to started the car, and have a oil pressure fault error. I scanned with my launch x431. And I have a error code DF067 injection multiplexed emission missing..

Sounds like no communication to engine ecu. Similar scenario to when doing a remap.

Look on the side of the relay some have diode/zener in it. typical Renault.

Hello, if i could hire you to check a problem in my car, where can i find an email or contact number? and if its possible, where about you are? thank you.

Top..

Hello I have a question about bsi, can i contact you by email

لطفان فارسی هم توضیح دهید

Tank pump

Please can you tell me the relay number.

Great sir you moble no.

the VIN wasn't showing on the first time because u entered " write VIN " and u exit without typing anything .so maxisys entered NULL as VIN