[ours2012]

Re: A/c pressure Sensor Test Renault Scenic II 1.9dci 96kw (131Hp)

Yours Climate Control ..
Would go have the Aircon system checked now multiplug is on, and see what codes will clear..
Themoplungers, though not sure if part of AC or Ecu as regards stopping AC, dont think they are,, would leave alone.
As you can not not buy these separately , ( You have 4 , look like glowplugs )

 

[Dainius Daujotas]

Re: A/c pressure Sensor Test Renault Scenic II 1.9dci 96kw (131Hp)

I tried connecting to the Ecu myself through ddt4all program, and I saw faults from the injection that I have( I get "Check Injection light" time to time) but did not see any error fault codes for Ac. Buuut, I tried disconnecting the sensor and I still didnt really get a error. So either the program was ill suited for Ac checking or there arent any fault codes for Ac. Anyways, guess Ill go down to a electrician tomorrow and see what he tells me.

Also one more thing, I tried checking the Voltage of the plug itself. And it all came back 0, except for when the fan randomly started working, then one of the connections( I imagine the + one?) Was around ~3.5V (And I think it should be 5?) Could that indicate something?

 

[ours2012]

Re: A/c pressure Sensor Test Renault Scenic II 1.9dci 96kw (131Hp)

If a fault detected in the ECU, and AC controlled by ECU, then there wont be any voltage to talk about AC, is disabled..

 

[Dainius Daujotas]

Re: A/c pressure Sensor Test Renault Scenic II 1.9dci 96kw (131Hp)

Okay fair enough. Means that the electrician is the person to go 2. I guess before that I can try going to a service and ask them to hook up the system and check if the gas is still even there, but I feel like just to be safe I will go to the guy either way(I got a recommendation of a good one who deals with Renaults specifically so hopes are high he will tell me everything). Ill post an update as soon as I know something. And thanks for you input so far!

Edit: Forgot to mention but when I was hooked up to the computer chilling in the Ac settings, the Ecu seemed to react to me pressing the A/c button as it showed something like "Request to Ac" Active or Inactive depending if On or off. But maybe Im misunderstanding something. But that means that the Ecu sends the command to Activate Ac and it gets it? In those same settings I remember seeing the passenger side fan information where it also showed Active or Inactive depending if the blowers were on.

Sorry for the randomly wrote down information, Im just trying to remember the details as best as I can, as that kind of caught my eye.

 

[LvR]

Re: A/c pressure Sensor Test Renault Scenic II 1.9dci 96kw (131Hp)

Sorry had to attend to a demanding Cayenne yesterday so missed out on part of the fun.


See you mention DDT ................ have you then managed to get to look at values for the refrigerant pressures now that you have connected the pressure sensor?


I would sort this aspect first imo - make sure you personally know and can monitor what the pressure in the system is.


Its good news that you report seeing the ECU reacting to the pressing of the AC button ................ can you confirm the engine speed bump/sound changes in sympathy with that parameter changing state (ECU compensates for the compressor pump load)?


What is you vehicle's 4 digit model code ?

 

[Dainius Daujotas]

Re: A/c pressure Sensor Test Renault Scenic II 1.9dci 96kw (131Hp)

Hey @LvR

Mmm yeah I did manage to hook DD.. up to the car and look at a few things. But I think I tried searching for the pressure sensor values but didnt see/find them.

And yeah I agree with you that probably now it would be a good idea. But once again I can only monitor the pressure with proper pressure gauges I suppose. Because at least when It comes the Ecu I don't really have a clue where to look. All I remember seeing is was some -40C temp values in there, and thats it,

And no, deffo cannot confirm the rev changes if that's what you asking, doesn't seem to be any. So A-My compressor is fked B-No pressure in the system to begin with C-Maybe just maybe some fault in the Ecu... But at least DD didnt show any faults related to the A/c Thou! I did try unplugging the pressure sensor and seeing if that shows a fault, it didnt. So either the program I was using wasnt that good, or I dunno (All wild guessing by me ofc )

Anywho, I should manage to meet a PROPER electrician this time as recommended by many, and he will probably tell me all I have to know. Since I'm also experiencing a "Check Injection" fault rather often, so would like to get that sorted out at the same time as well.

Edit: Scheduled a meeting tomorrow morning. And for now I kind of ran out of options of what I can do. Except for maybe trying to go to a service and ask them to check if there is any pressure in the system, because maybe... just because that sensor was unplugged( I'm still really mad as how this came to be) and the system not properly filled that now the reason it isnt working(or me seeing a fault) is just that there isnt enough pressure in it for it to even work.

 

[Dainius Daujotas]

Re: A/c pressure Sensor Test Renault Scenic II 1.9dci 96kw (131Hp)

Some adition. Went to some ac people, they hooked it up, checking the freon and it was at ~350g full is 550g, so either the system has leaked, or the system wasnt filled up properly (If its another leak im gonna evaporate like the gas in the car)

So I filled the system up but ofc it still doesnt work, So fingers still crossed for tomorrow and that the electrician guy will answer all my problems.

Also @LvR I'm not sure what is a 4 digital code you mention.

 

[LvR]

Re: A/c pressure Sensor Test Renault Scenic II 1.9dci 96kw (131Hp)

Refrigerant pressure is found in the ECU section - its here that its used to compensate the engine speed, torque output and also battery charge rate .


In order to fill the system yes - unfortunately the gauges hung off the LP port is the only reading to trust. However - the high pressure line's measured pressure (your sensor's purpose) can help you check the guys are not overfilling the system and thereby again screwing you.


If you saw -40C temps on there I guess you have no or very little refrigerant in the system (low pressure refrigerant = low temperature on the P vs T chart) .............. lets hope as you say you now have a situation where a low refrigerant pressure is simply disabling and protecting the pump.

Went to some ac people, they hooked it up, checking the freon and it was at ~350g full is 550g, so either the system has leaked, or the system wasnt filled up properly (If its another leak im gonna evaporate like the gas in the car)

So I filled the system up but ofc it still doesnt work, So fingers still crossed for tomorrow and that the electrician guy will answer all my problems.

Also @LvR I'm not sure what is a 4 digital code you mention.

So just imo - I don't know anybody that can hang a gauge of the AC system and come up with a statement as to the weight of refrigerant currently in the system ...................


Also imo only - again - how the heck did they fill the system properly without the pump kicking in ?:crazy:


On your driver's door pillar there is a sticker with your Vin number on it - its the 4 characters found in position 4,5,6, and 7 of the Vin number - mine is eg JM1B - yours will be something similar like JMxx

 

[ours2012]

Re: A/c pressure Sensor Test Renault Scenic II 1.9dci 96kw (131Hp)

Or the one @LvR really wants is the 4 alphanumeric just below this VIN, this is more accurate, as Renault dont always play fair

 

[LvR]

Re: A/c pressure Sensor Test Renault Scenic II 1.9dci 96kw (131Hp)

Or the one @LvR really wants is the 4 alphanumeric just below this VIN, this is more accurate, as Renault dont always play fair

Experience man ...... experience!>

 

[Dainius Daujotas]

Re: A/c pressure Sensor Test Renault Scenic II 1.9dci 96kw (131Hp)

Refrigerant pressure is found in the ECU section - its here that its used to compensate the engine speed, torque output and also battery charge rate .


In order to fill the system yes - unfortunately the gauges hung off the LP port is the only reading to trust. However - the high pressure line's measured pressure (your sensor's purpose) can help you check the guys are not overfilling the system and thereby again screwing you.


If you saw -40C temps on there I guess you have no or very little refrigerant in the system (low pressure refrigerant = low temperature on the P vs T chart) .............. lets hope as you say you now have a situation where a low refrigerant pressure is simply disabling and protecting the pump.So just imo - I don't know anybody that can hang a gauge of the AC system and come up with a statement as to the weight of refrigerant currently in the system ...................


Also imo only - again - how the heck did they fill the system properly without the pump kicking in ?:crazy:


On your driver's door pillar there is a sticker with your Vin number on it - its the 4 characters found in position 4,5,6, and 7 of the Vin number - mine is eg JM1B - yours will be something similar like JMxx

Don't forget my system only has one connection to it (Its the high pressure one?Don't remember )Once again sorry if im misunderstanding what you saying

Maybe I wasnt clear. They checked the level by pulling out all the refrigerant out of the system which was 350g, then they put it all back in + and extra 200g. Once again yes, this was done with the car turned off, Then when he was done he asked me to turn the car on, he looked at the pressure metter on his machine and said yeah your ?pump? I believe he said wasnt engaging. And thats that, he removed the thing, put some thing on to see if there were no leaks from the gauge on the pipe and thats that.

Ill get the Number thing in a few minutes when i go downstairs

 

[Dainius Daujotas]

Re: A/c pressure Sensor Test Renault Scenic II 1.9dci 96kw (131Hp)

Was the number you refered to the one on my front windshield in the corner? Starts Vf1JMS4063622...

 

[LvR]

Re: A/c pressure Sensor Test Renault Scenic II 1.9dci 96kw (131Hp)

Don't forget my system only has one connection to it (Its the high pressure one?Don't remember )Once again sorry if im misunderstanding what you saying

Maybe I wasnt clear. They checked the level by pulling out all the refrigerant out of the system which was 350g, then they put it all back in + and extra 200g. Once again yes, this was done with the car turned off, Then when he was done he asked me to turn the car on, he looked at the pressure metter on his machine and said yeah your ?pump? I believe he said wasnt engaging. And thats that, he removed the thing, put some thing on to see if there were no leaks from the gauge on the pipe and thats that.

Ill get the Number thing in a few minutes when i go downstairs


Was the number you refered to the one on my front windshield in the corner? Starts Vf1JMS4063622...

No - the French (like many others lately) has been insisting on fitting a high pressure port connection onto the low pressure line (suction or evaporator side) ................ confusing yes I know.:wink2:


Yes that number I was asking for is JMS4 off your Vin number .............. though it doesn't make sense to me at all - can't find such an animal - this is where Ours' earlier comment obviously comes in

 

[Dainius Daujotas]

Re: A/c pressure Sensor Test Renault Scenic II 1.9dci 96kw (131Hp)

Alright... It works... The problem was 2 things, the sensor and the actual plug... I changed the sensor the day before but it still wasnt working. So he checked all the leads... All the wires seemed to be fine, we were almost ,,giving up,, when he noticed that the holes of the plug seem to be a bit too wide(as in they have been forced, or it was tried to plug in a different sensor???) Anyways, he fiddled about it, made the holes for the contacts in the plug smaller, we hook it up, And baaam we hear a click and it starts blowing cold!!!! After that just 4fun I tried fitting the old sensor back and it didnt work.

MORE QUESTIONS THOUGH!
After we shut the car down, we heard a small hissing sound(as if air was leaking from the system?) for about ~10secs max, Is that just the pressure regulating itself? Or could there be a leak somwhere? I would guess the sound was coming somwhere from the front where the radiator was.
Also the blow isnt that strong(but that is most likely cuz I havent changed the cabin filter in awhile?right?)
The Electrician guy said the same thing as you @LvR, that now it also might be that the amout of gas in is low, because the compressor wasnt kicking in when they topped it up.
So he recommended to go vacuum(I think he said that) check the system or smth like that.

 

[LvR]

Re: A/c pressure Sensor Test Renault Scenic II 1.9dci 96kw (131Hp)

OK then - glad you at least seem to be making headway now.


Re the hissing sound:


Once the regulating valve located on the evaporator starts closing to prevent ice forming on the coils, the pressurized refrigerant coming form the pump is stored in the accumulator till its needed or until the pump gets switched off - then, if the accumulator has liquid in it and the pump is off (either AC control system or you switch ignition off), and your expansion control valve on the evaporator in the car opens because its sensing a non-freezing temp on the coils, the liquid will slowly move to the car's interior and you will hear a hiss as the liquid flashes to gas in the evaporator ................ so could be that what you heard is normal.


Re the uncertainty of the refrigerant volume in the system:


That's why I earlier commented "no exceptions" for the filling method - that is the absolute only guaranteed way to properly fill an AC system plumbing. Sure - in the factory the avg production volume of the AC plumbing is very close to fixed so for a std and non-modified AC plumbing one can easily spec an expected volume/weight of refrigerant to use to fill the system, but in your case you have replaced a hose and joints with a new assembly possibly differing in volume from the factory spec .......................... and as such there now is uncertainty about the fill of the system.


Yeah sure - you will have some people argue its probably good enough and if you want to listen to those guys then fine by me too.



If you want it done right though, the AC guys doing refill must use a R134 PT chart, measure ambient temp, follow what I said before and make sure the LP side actually is regulated by the expansion valve and that the HP side runs with about 5 to 10C differential to environment - this will ensure your HP side doesn't cause the pump to get disabled because of over-pressurization and you again start complaining that the AC isn't cold or doesn't work on hot days after all the money and effort spent.


FWIW - imo you never slap a slug of refrigerant (even the assumed correct volume as per spec on the system sticker) onto the LP side of the compressor without the thing running - you can sustain damage on the pump - it simply smacks of unprofessionalism


The blowing aspect you are on your own if you suspect the filter needs replacement already


I reckon you need to be able to view the HP refrigerant pressure yourself on a scanner just to check on the jokers filling the thing



Sorry for the many words - heres hoping somebody else at least get to save a ton of money by getting to know the basics of AC

 

[Dainius Daujotas]

Re: A/c pressure Sensor Test Renault Scenic II 1.9dci 96kw (131Hp)

Its fine @LvR . I mean I probably feel the same way, just for me its personal and more painful(wallet wise ofc ) , for you its just realizing once again, Im sure, that the World is a scammy and dark place sometimes

Thats why I guess its just really imporant to know where to go to for certain problems. This electrician guy for example was super great, told me how it is/didnt honestly charge that much for what he did(usually a simple fault clean is ~25euros) this guy took 30, and he literally got all oily... and took like an hour with a bit of help from me. So thumbs up to this honest electrician will deffo go there again if needed.

Yeah and as far as the A/c goes, Im pretty sure it should be colder than it is now. But it works, it does the job for now even with +30C today.
So I think my smartest bet would be just to wait a bit and see if it gets worse or stays the same, If same than I guess a need a proper top-up, if it becomes worse- Still a leak somewhere : //

But either way! I appreciate your help and time you took to explain all these things to me! Cars are still confusing but with the help of great at honest people like you Ill get there.. Ill get there .