PO476, but only during KOER test with AE
#1
PO476, but only during KOER test with AE
This has been happening for as long as I've had AE, but I'm just now getting around to asking about it...
When I run the KOER test, I always get a PO476, indicating a problem with the EBPV. The code never shows up "in the wild", only during the test. When the test is running, I can plainly hear the valve actuate, and the resulting exhaust hiss. Also, the valve works fine in cold weather, works great in my decel tune, and doesn't leak. (I rebuilt the valve when I had the turbo off a year or so ago, but the KOER test would throw the code both before and after the rebuild.
Also, all three pressure sensors (I.e. barometric sensor on the PCM, MAP and EBP) show 11.89psi, which I assume is correct for my altitude (5440ft)
So, is this a real problem, or just some anomaly with the KOER test?
Mark
When I run the KOER test, I always get a PO476, indicating a problem with the EBPV. The code never shows up "in the wild", only during the test. When the test is running, I can plainly hear the valve actuate, and the resulting exhaust hiss. Also, the valve works fine in cold weather, works great in my decel tune, and doesn't leak. (I rebuilt the valve when I had the turbo off a year or so ago, but the KOER test would throw the code both before and after the rebuild.
Also, all three pressure sensors (I.e. barometric sensor on the PCM, MAP and EBP) show 11.89psi, which I assume is correct for my altitude (5440ft)
So, is this a real problem, or just some anomaly with the KOER test?
Mark
#3
Ummm... About the time I clicked "Submit", I thought of something: I wonder if this is an altitude thing, meaning the the expected EBP is lower than some preset number, and the test protocol isn't smart enough to figure out that it's low because the base barometric pressure is low due to the altitude? Have any of you other Colorado guys seen this?
Mark
Mark
#4
#5
#6
Bump for the Tuesday crowd. I posted this on our club forum, too, but this place gets a lot more traffic...
Any of you with AE run KOER tests? Do you see PO476? At what altitude are you running the test?
I'd take mine to a lower altitude, but it's only been below 4000ft once in the ten years I've owned it, and getting below 4000ft means a looongg drive.
Mark
Any of you with AE run KOER tests? Do you see PO476? At what altitude are you running the test?
I'd take mine to a lower altitude, but it's only been below 4000ft once in the ten years I've owned it, and getting below 4000ft means a looongg drive.
Mark
#7
Trending Topics
#8
Thread
Thread Starter
Forum
Replies
Last Post