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  #1  
Old 11-11-2011, 10:19 PM
j4henry j4henry is offline
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VGT readings on scangauge

I know I have read several threads on the VGT this is what I find yet Im confused
VGT Duty Cycle (%)

TXD: 07E022096D

RXF: 04620509066D

RXD: 3010

MTH: 00647FFF0000

NAM: VGT

KO=0 LI=73 HI=43 OR=0-100 %

this being read after 60 miles of driving My vgt reading at Idle is 56 and 58% and WOT up a grade I saw 24%. Should I take my turbo back apart and clean again or am I good to go?
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  #2  
Old 11-12-2011, 12:22 AM
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Seams alittle off for IDEL IDK

IIRC mine is in the 60-68% range at idel but not positive on that
I do know that I didnt have the exact numbers called for the value

I wouldnt pull the turbo and clean just yet I might check the MAP & EBP sensors maybe clean them

MAP & EBP inputs are what the PCM uses to control VGT duty cycle as well as Acelerator pedal position and a few other things. But when those sensors get gummed up or go bad the turbo dont act right

setup the SG for MAP & EBP & BARO they need to be within .5psi at KOEO

If you dont have any drivability issue its probably ok
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  #3  
Old 11-12-2011, 02:50 PM
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Another question my DTC count was 5 so I cleared them now it's back up to 2 but scanner I have shows nothing do I need to have scanned at dealer?
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Old 11-12-2011, 04:33 PM
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Sadly, the SGII wont pick those up. It, unless it has been updated, only shows the CEL lit codes.

I'm not sure of which scanners will read those. AE more than likely. I am trying out the Torque APP for android phones, and surprisingly it does. My DTC count was showing a code for a wiring issue on my Fan Speed Sensor.
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Old 11-13-2011, 06:48 AM
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I've noticed that my turbo is acting/sounding differently at idle in the mornings and after hooking AE up it shows 78% DC at idle. After commanding it open and closed (0% and 85% duty cycle) it always returns to 78% at idle. I was just wondering if this was normal for what everyone else is seeing.
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Old 11-13-2011, 07:51 AM
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A high duty cycle means the vanes are closing (as I am sure you know). During engine operation at low speeds and load, little energy is available from the exhaust to generate boost. Trying to get the maximum energy that IS available, the vanes will close. This accelerates the exhaust gas through the vanes and then across the turbine wheel. At idle, the normal range for VGT duty cycle is 60 to 82%.

That seems like a wide range, but your reading sounds normal. I will have to see what mine does this morning.
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Old 11-13-2011, 12:42 PM
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Well Tim, I guess I am wrong. I was expecting to see a VGTDC near yours. Mine is at 60% (actually a few tenths under) at idle. Guess some more research is in order for me!
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Old 11-13-2011, 12:58 PM
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Quote:
Originally Posted by bismic View Post
Well Tim, I guess I am wrong. I was expecting to see a VGTDC near yours. Mine is at 60% (actually a few tenths under) at idle. Guess some more research is in order for me!
I checked Jake's truck and his is at 70% +/- so I don't think you're too far off on the range. Remember....we are talking about 3 different VGT turbo's here so I wouldn't expect them to be identical. Benny's is in the 60-68 range (he thinks) so I don't think any of us are really that far apart. My main concern was if it was supposed to be at 85 or 0 and it's neither so I think I'm "OK".
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Old 11-21-2011, 09:56 PM
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Well now I have 4 DTC codes which were egr flow, map sensor, turbo issue and fan circuit. The tech had it up on laptop and cleared codes now with a KOER test I will not get rid of a P2263??? So he went a little further and while he was watching VGTDC# it would never stay steady at idle it would jump from 70 something to 20 something. And while watching the graph you can hear the idle go up and down with the graph. So we checked the map hose was ok the nipple it hooks to on the intake nothing there, Any suggestions where to go from here. Would cleaning the turbo again to any good????
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Old 11-21-2011, 10:21 PM
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Stuck turbo, MAP sensor or MAP hose plugged or leaking (I see you have ruled this out), CAC hose diconnected or leaking, intake leaks, exhaust restriction, exhaust leaks, EBP sensor or EBP tube plugged.

This code is set when MGP does not go over 15kPa or 2.2 psi when the following conditions are met: rpm must be over 2800; VFDES above 35; and EGRVP above 0.10. All of these conditions must be met for 5 seconds for the code to be set. This code can also be set if there is ANY condition that would produce low power. For 2003 MY's, this code could also be set if the difference between EP_G and EP_DES is more than 14 kPa or 2 psi for greater than 15 seconds at idle or 60 kPa or 8.7 psi for 60 seconds above 800 rpm.
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  #11  
Old 11-22-2011, 03:09 AM
j4henry j4henry is offline
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Quote:
Originally Posted by bismic View Post
Stuck turbo, MAP sensor or MAP hose plugged or leaking (I see you have ruled this out), CAC hose diconnected or leaking, intake leaks, exhaust restriction, exhaust leaks, EBP sensor or EBP tube plugged.

This code is set when MGP does not go over 15kPa or 2.2 psi when the following conditions are met: rpm must be over 2800; VFDES above 35; and EGRVP above 0.10. All of these conditions must be met for 5 seconds for the code to be set. This code can also be set if there is ANY condition that would produce low power. For 2003 MY's, this code could also be set if the difference between EP_G and EP_DES is more than 14 kPa or 2 psi for greater than 15 seconds at idle or 60 kPa or 8.7 psi for 60 seconds above 800 rpm.
I'm sorry but you lost me at " this code sets"
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Old 11-22-2011, 03:17 AM
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Quote:
Originally Posted by j4henry View Post
I'm sorry but you lost me at " this code sets"
I'm fairly certain that he quoted the code parameters from the book meaning that those are the engine running conditions it takes to set that code.

I'm wondering if your VGT duty cycle isn't "jumping" from 20 to 70% because of PCM programming that causes the VGT to cycle the turbo vanes to keep them from sticking?? You might also want to check the EBP sensor and tube on the drivers side exhaust manifold.
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Old 11-22-2011, 03:46 AM
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Personally, I don't think that your VGT readings are off that much.

npccpartsman said it well IMO (VGT readings are probably PCM driven and if you can hear the turbo sycle, then the vanes aren't stuck). I second the recommendation to check the EBP and EBP tube. The main thing I was saying earlier was that the code can be set due to about anything that produces low power conditions.

You also need to be looking around the fan clutch wiring / connector as well, since you got that code earlier. It is not good to keep going w/ a fan clutch on the way out or w/ shorted wiring to it.
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Old 11-22-2011, 07:52 AM
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Thanks guys after this holiday is over I'm going to take all turbo tubes and clean & inspect boots and recheck ebp tube and see what happens
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Old 11-22-2011, 08:48 AM
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Oh and I forgot to mention that while watching VGTDC up in the left corner where it said varying it never stayed one or the other seemed like it didn't know what it wanted to do varying or closed I believe it was saying closed was blinking so fast couldn't tell
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Old 11-22-2011, 08:48 AM
 
 
 
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