Renault Scenic K9K728 Doesn't start!

Good afternoon!

I begin my adventures for this forum after presenting myself properly requesting help since I see that there are several professionals and people with good judgment.

The fact is that I have a Renault Scenic 1.5DCI 100 hp of 2005 with Motor Code K9K728 that has 150000km.
The point is that one day without more or more when the car was going, the car stops and no longer starts again.

In the Renault de Miranda dealership they diagnose loss of compression in cylinder number 3 and how it smells like I take it home to look at it.

The fact is that after performing several checks these are the symptoms and is resulting:

- Synchronization verification of the different elements of the OK distribution.

- The starter engine acts and the engine rotates without complications or rare noises.

- Checking engine compression: 1st cylinder 16,40; 2nd cylinder 18,30; 3rd cylinder 16; 4th cylinder 17. Although a bit poor compression I don't think this is the reason for the breakdown (correct me if I'm wrong).

- During the start -up attempts the car does really strange things, the lights are ignited alone, the clean ones are activated and makes a noise through the clean sensor. I have also observed that I have 12V constantly in the cables of the heater even with the vehicle without contact.

- I have tried to connect with the ELM 327 to the UCE to see if it sings a failure but there is no way, the switchboard does not recognize, although the device I have is no wonder gives me the impression that there is some breakdown in the UCE or in the central unit of the cabin.

- I have proven the fuses of the vain motor watching a pink relay that I do not know what it is, I have to investigate.

- This afternoon I will check the crankshaft position captor and the camshaft, the position captor of the injection pump cylinder, the prepostcalenting box, as well as determine if diesel reaches the cylinders.

Excuse me for the brick that I have put you, to see if someone brings some light to this breakdown. I will inform you.

All the best.

Hi Ekaitz, my welcome to this forum (I also prefer the old cars) .. As for the k9k east that you have already looked several things I also rule out that I have a compression theme (although it seems low for a diesel, for these that are no longer those of before they no longer compress them), I can have a failure in the crankshaft collector (the one that goes in the clutch bell), and as in all of them. Being anything and for this is the scann (it seems easy to cars that also force "reprogram" ECU every time .... (I will never know why .. Will it be the modern era of Renault .. $$?) I have ever given the case in a lagoon and megane who did not start and without knowing that, stepping on the brake and clutch at the same time they started without any problem ???? and then then I don't miss .. ???? Try also to disconnect battery for an hour (to see if I reset, which I have also seen in the 1.8 16v lagoon and this also had to tear it out like that when it gives it there ... especially in summer it goes crazy and in the house they do not know how to say that it is ... well, I join you in the search of knowing that it happens to the scene (if it is fault or witch. For this "billet" but we are talking about "Renault" ..

Thank you very much for your rapid answer Ismael.

In relation to what you tell me seeing the manual, refer to the Clip program as your good you say for many breakdowns.
I had also thought of some anti -bar or anti -theft system that is active and does not start, which is not how it could be removed, I suppose that going to the house. To leave it for a while without battery to see if I reset I have already tried, but it has been unsuccessful.
Today I have tried if diesel came to the injectors and if it reaches all of them, I have disassembled the position captor of the injection pump cylinder to take the reference. There has been a moment that has made a threat to start but nothing more. Tomorrow I will disassemble the crankshaft captor and try to try on the brake and clutch pedals at the same time as you tell me.
Tomorrow I inform the novelties.
By the way, does anyone know what price the switchboard can be rescheduled?

Ismael, with respect to Laguna 1.8 16v it is curious that he does it in summer and the rest of the year does not, I don't know what it can be, but since I am looking at if I see something or I think of telling you.

All the best.

Hi Ekaitz, another thing that I forget to say is the issue of the battery load that drives the electronics (I mean the load percentage if it is low) but you say that it stands in progress ... and another is also the low pressure on the injection ramp (in the sphere) that they comment (grab ..) that is due to the internal wear of the pump and creates chips ... If fuel reaches you to the injectors. Pressure in ramp to see if it is not too low but this failure should be given the pressing collector in ramp; From this Renault I think he called for review or that it was a defect that recognized the brand ... (I hope this is not). From the price of reprogramming the ECU I have no idea, or to reprogram the targeta (this system cannot be canceled). I assume that you checked that the fuel suction line from the deposit to the pump entrance does not present air intakes (including the gasoline filter), well, these faults if the diagnosis could be made with the clip will save you. Years ... In the house they said it: admission butterfly = 1,800 euros .... the car works perfectly when you stop and want to start again (to disconnect ....). Greetings and see the Scenic !!!

Hi Ekaitz, another thing that I forget to say is the issue of the battery load that drives the electronics (I mean the load percentage if it is low) but you say that it stands in progress ... and another is also the low pressure on the injection ramp (in the sphere) that they comment (grab ..) that is due to the internal wear of the pump and creates chips ... If fuel reaches you to the injectors. Pressure in ramp to see if it is not too low but this failure should be given the pressing collector in ramp; From this Renault I think he called for review or that it was a defect that recognized the brand ... (I hope this is not). From the price of reprogramming the ECU I have no idea, or to reprogram the targeta (this system cannot be canceled). I assume that you checked that the fuel suction line from the deposit to the pump entrance does not present air intakes (including the gasoline filter), well, these faults if the diagnosis could be made with the clip will save you. Years ... In the house they said it: admission butterfly = 1,800 euros .... the car works perfectly when you stop and want to start again (to disconnect ....). Greetings and see the Scenic !!!