New V70 II T5 owner - introduction and general advice Topic is solved

[jonesg]

I tested it with my 04 v70, it doesn't work because there is no pressure sensor at the rail nor PEM it can read.
Maybe I'll try reading fuel pressure with vida, should do it.

[hiroku]

Yeah, I expected that. It's my understanding there's a separate module for the fuel pump. Even if it feeds the fuel pressure information to the ECM, the elm wouldn't be able to read it.

VIDA on the other hand should probably work, but I won't have my DICE until at least next week. Let me know your findings!

[jonesg]

i think , in the absence of fuel pressure sensors vida can read fuel pump duty cycle.
I'll check it out.

[jonesg]

I spent 90 minutes with vida, very unintuitive software, it shows a pressure gauge used at the fuel rail because mine doesn't use on demand PEM or pressure sensor on the rail. I couldn't find pump duty cycle and it doesn't allow pump actuation from vida, but then you only need to turn the ig key to do that.
I was able to roll windows up and down so I know I was connected.
best bet is old fashioned pressure gauge.

[hiroku]

Thanks for the feedback.

That is a bummer. I will look into a physical pressure gauge, but while that will allow me to see some pressure drop while the car is off, I won't be able to see if the pressure drops in full load.

BTW, my copy of VIDA doesn't seem to be fully working. I can see the screen where you would read the values in real time and issue commands to the car (though I can't do that yet without my DICE), but I can't access the parts catalogue or the repair instructions. Nothing shows up in the "Information" tab at all. Any idea what I may have done wrong?
I got the VM download from Volvodiag.

[volvolugnut]

To watch fuel pressure while driving, I have run a fuel pressure line from the end of the fuel rail out the corner of the hood to view from the drivers seat. You can remove the internal check valve from the Schrader valve to get flow to the remote gauge.
volvolugnut

[jonesg]

VIDA needs a vehicle scan to generate a profile of the car to populate the information menu.
The first scan will take some time because theres probably a bunch of legacy codes that were fixed but not cleared.
I would make a note of them before clearing and re-scanning.
Once you have that first scan you can access it anytime without being plugged into the car.

I also have a subscription to All Data, its a lot quicker to navigate to information, includes circuit diagrams.
A lot of the info is copied directly from Vida.

Vida shows testing fuel pressure for my car with no PEM by running the hose for the gauge into the car through the window.
I took a look at my fuel filter, theres an in line schraeder valve next to the filter. It might not be stock but its handy.

[jonesg]

from vida.

fuel gauge.jpg (56.35 KiB) Viewed 539 times

[hiroku]

VIDA needs a vehicle scan to generate a profile of the car to populate the information menu.
The first scan will take some time because theres probably a bunch of legacy codes that were fixed but not cleared.
I would make a note of them before clearing and re-scanning.
Once you have that first scan you can access it anytime without being plugged into the car.

I also have a subscription to All Data, its a lot quicker to navigate to information, includes circuit diagrams.
A lot of the info is copied directly from Vida.

Vida shows testing fuel pressure for my car with no PEM by running the hose for the gauge into the car through the window.
I took a look at my fuel filter, theres an in line schraeder valve next to the filter. It might not be stock but its handy.

I figured it could be something like that. That's annoying because I won't have a way to plug the car in until at least next week, but was curious to check some of the diagnostic/repair procedures and parts lists. Guess that will have to wait a little longer.

Definitely heard of the old-school method of running the pressure gauge into the car - interesting that it's actually in the manual as the "correct" way to do this!

Thank you both.

[hiroku]

So, I tested my cheap ELM327 adapter today and not only managed to connect to the car, but also read some values! Didn't really expect it to work. Not sure how accurate the readings are, but that will do until I have a DICE. Went on a quick drive so managed to log a couple of values, but nothing too comprehensive.

The bad news is, the car is still severely lacking in power. Actually seems to be worse than before. It's weird because it runs and sounds great, it's just completely gutless. If you didn't know, you'd think it was the N/A 2.4 engine in excellent condition - not a T5.

No errors or CEL or anything. It's like the engine is on safe mode, but there's no clear indication of that anywhere.

Here are some of my findings with the ELM:

• The "calculated boost pressure" log showed a few peaks of around 1,10 bar (16 psi), but the maximum steady value I read in WOT was 0.49 bar (7 psi), which seems on the low side, but even that sounds like too much. It essentially feels like an N/A car.

• The little "calculated power from fuel flow" gauge read a maximum of 165 hp, which sounds about right according to my butt dyno.

• Throttle opening hit 99% on WOT, so the throttle potentiometer and drive-by-wire seem to be working fine. Actually I think the car got a new ETM a few years back.

• Alternator voltage was around 13.3-13.5 V, which seems on the low side. Could explain the issue with my lights dimming.

• Maximum "calculated engine load" value was like 56 %. Not sure what to make of that.

• MAF reading on full boost was around 127 g/s.

• Short term fuel trims was all over the place during that drive. The logs vary from -22% to over +18%. Long term value I read last week was 0.8%.

It didn't seem to log any values other than that.

Still suspect it could be a fuel issue, the rail loses pressure fast - the car takes about 5 seconds of cranking to start after sitting for 10 minutes. Maybe it can't keep up under boost.

Anything else I should check?

Thanks!