2002 volvo s60 Do I have a bad engine computer?

[turtlehead]

Mike:

I do have Vida/Dice, and I just posted a video on Youtube showing the results. Here is the url:



The RPMs go up because I am pushing on the gas pedal. Let me know what you think.

Thanks again to all who have contributed so far, your comments have been most helpful.

[precopster]

You can slide across the heading tabs to reveal the full name of the table. I couldn't see which one was desired and which was actual, however after some delay the actual should follow desired. If not the VVT solenoid is clogged or faulty.

[turtlehead]

Still pursuing the quest.

As Mike (precopster) suggested, I installed a spare vvt solenoid this morning but I got the same result. It wasn't a new solenoid, but it did come off of a running car. I know, I need to go back and test both solenoids and make sure, so I plan on doing that next. Also, I will do another Vida scan this evening, and see if I can get a better video with the full names of everything.

Are there any other parameters that I should include in the scan?

My question, though, is whether a bad vvt solenoid cause the engine to stall this way? If I unplug the solenoid, how would that affect it, other than throwing another code? I already know the engine runs, in a crappy sort of way, with the cam sensor disconnected.

I'm starting to look again at the ECU as the culprit now, because I am about out of every other idea.

[doublebug]

you have VIDA. So check every parameter you can see in the ECM while engine works these 30 seconds.
Every parameter has short description and for some there is values that should be at idle.
So maybe you will notice something wrong or strange.
If so that may help to get some other ideas.

[doublebug]

so far I replaced only 3 Denso ECUs like yours. (for almost 4 years).
So I must say that it more or less reliable. So It looks like after starting ECU works ok and when goes to the some other level of working it gets some error and stalls.
When you run it with unplugged cam sensor ECU never tries to reach this level and works badly but works.

[turtlehead]

I did a new scan, same results.

I followed Doublebug's advice and looked at a lot of different parameters, but my version of Vida only allows me to examine five at a time,which makes slow going. I didn't see anything that looked out of the ordinary, but I just started using Vida and there's a good chance I don't know what I should be looking at.

Here is the url for the first video, which shows the engine rpms and the cam actual/desired settings:

https://youtu.be/c-juwpsKXG8

Here is a second one, where I did not push on the gas pedal and left the rpms at idle speed:

https://youtu.be/l7GF7NEGeug

In both videos, the engine runs for about 25 seconds or so, then dies. Fuel pressure does not decrease, neither are there any misfire codes.

Then I unplugged the cam sensor and did the following scan:

https://youtu.be/tscjujqQwAo

I would just leave the cam sensor unplugged and get the thing on the road, but this car is for my girl and I'd kinda like to keep her around.

If there is any other specific parameters I should consider, I'm all ears.

Thanks for everything, guys. There's gotta be a simple answer to this.

[turtlehead]

I just noticed Doublebug's most recent post, and I'm relieved to hear how reliable the Denso ECU's are.

So now I'm on to trying to figure out what kicks in at the 25 second mark. Is there any chance this is an immobilizer issue? Doesn't that shut the engine down within like a second or two?

[doublebug]

If you had immo issue it won't work ok without cam sensor too.

[doublebug]

Actual spark advance should be around 12° at idle.
if you have changed crank sensor I would like to see it's signal with oscilloscope.
Signal for cam sensor will be useful too.

[turtlehead]

I don't have access to an oscilloscope, unfortunately. Both the cam and crank sensors are new, but I know its possible for new ones to be bad. I have spares that I accumulated early on in this process from the local u-pull-it that I can swap out. I did swap out the old cam sensor yesterday, it made no difference. The crank sensor is a little more difficult to access but I've got a couple of those as well, I can put another one in and re-do the vida scan. Or better yet, maybe I need to get my tester out and double check the cam and crank sensors, maybe one of those is bad.

But doesn't the ECU determine engine rpm's from the crank sensor? Is there another rpm sensor that it uses?

And thanks, Doublebug, I'm obviously not thinking clearly, you are right, it can't be the immobilizer.