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Old 04-03-2006, 08:10 PM   #1
dlowman
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Member#: 22998
Join Date: Aug 2002
Vehicle:
2004 WRX STi
GT35R 572 whp 93/meth

Default problem with utec need your help

I am having a wierd issue with my utec. I am running the utec on top of the ecutek. Because of the power I am making, anyway I have an issue that just started recently. I am seeing in my utec logs the TPS going to 0% radonmly. Its almost like hitting fuel cut. Only seems to happen under boost.

Here is an example of what I mean:
3293 -4.5 3.0 36 10 00 +44.6 14.1 +20.1 -4.0 375.00 2.6
3220 -4.5 3.0 36 10 00 +44.6 13.8 +20.0 -4.0 375.00 2.6
3306 -3.0 3.2 45 10 00 +43.2 14.7 +20.2 -4.0 375.00 2.6
3390 -1.2 3.2 59 10 00 +41.9 16.8 +20.6 -4.0 375.00 2.6
3479 +0.4 3.4 65 10 00 +41.1 18.6 +20.8 -4.0 375.00 2.7
3671 +1.7 3.4 70 10 00 +40.2 20.7 +21.0 -4.0 375.00 2.9
3675 +2.3 3.5 70 20 00 +39.6 22.7 +18.0 -4.3 375.00 3.0
3762 +3.1 3.5 73 20 00 +36.8 25.4 +18.0 -4.9 375.00 3.0
3858 +4.1 3.6 79 20 00 +35.8 29.8 +19.2 -4.7 375.00 3.1
3940 +5.3 3.8 81 30 00 +34.0 32.3 +20.0 -5.0 375.00 3.2
4120 +7.0 4.0 81 40 00 +31.4 35.6 +20.2 -6.8 375.00 3.3
4295 +8.8 4.3 82 50 00 +28.7 40.4 +19.7 -8.6 375.00 3.4
4474 +11.3 4.5 79 60 00 +27.0 46.0 +18.5 -11.6 375.00 3.5
4721 +14.7 4.7 71 70 00 +25.2 54.8 +18.8 -11.1 375.00 3.5
4901 +17.6 5.0 70 80 00 +24.4 63.4 +19.9 -10.0 375.00 3.8
5257 +19.8 4.8 65 80 00 +25.2 63.6 +21.0 -9.1 375.00 3.9
4967 +21.2 4.8 61 80 00 +27.7 64.3 +27.6 -9.1 375.00 4.4
5592 +20.8 5.0 56 80 00 +26.0 62.6 +21.7 -7.6 375.00 3.9
4873 +16.6 2.0 1 00 00 +23.4 59.3 ECU. -3.0 ECU. 1.7
4374 +8.8 4.5 1 00 00 +23.6 59.3 ECU. -2.3 ECU. 3.5
3921 +0.4 3.5 1 00 00 +23.7 59.3 ECU. +0.2 ECU. 2.9
3483 -7.3 2.9 1 00 00 +23.6 59.3 ECU. +2.0 ECU. 2.4
4100 -11.2 2.3 11 00 00 +29.6 7.6 ECU. -1.9 ECU. 2.2
4060 -11.8 2.6 13 00 00 +44.4 11.1 ECU. -0.8 ECU. 2.2
4030 -11.8 2.2 12 00 00 +36.9 7.8 ECU. -1.1 ECU. 1.8
3958 -12.0 2.2 9 00 00 +40.5 7.9 ECU. -0.8 ECU. 2.0
3987 -12.4 2.4 9 00 00 +40.7 6.7 ECU. -0.5 ECU. 2.0
2878 -4.5 2.8 30 10 00 +43.4 12.8 +21.8 -4.0 ECU. 2.4
2858 -4.5 2.8 30 10 00 +44.2 11.1 +21.5 -4.0 375.00 2.4
3033 -3.2 3.0 36 10 00 +44.8 12.6 +20.0 -4.0 375.00 2.5


Any ideas?

thanks,

Dan
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Old 04-04-2006, 01:52 AM   #2
WRX-Blue-Mica
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Default

Code:
4120  +7.0 4.0 81 40 00 +31.4 35.6 +20.2 -6.8 375.00 3.3
4295  +8.8 4.3 82 50 00 +28.7 40.4 +19.7 -8.6 375.00 3.4
4474 +11.3 4.5 79 60 00 +27.0 46.0 +18.5 -11.6 375.00 3.5
4721 +14.7 4.7 71 70 00 +25.2 54.8 +18.8 -11.1 375.00 3.5
4901 +17.6 5.0 70 80 00 +24.4 63.4 +19.9 -10.0 375.00 3.8
5257 +19.8 4.8 65 80 00 +25.2 63.6 +21.0 -9.1 375.00 3.9
4967 +21.2 4.8 61 80 00 +27.7 64.3 +27.6 -9.1 375.00 4.4
5592 +20.8 5.0 56 80 00 +26.0 62.6 +21.7 -7.6 375.00 3.9
4873 +16.6 2.0 1 00 00 +23.4 59.3 ECU. -3.0 ECU. 1.7
4374  +8.8 4.5 1 00 00 +23.6 59.3 ECU. -2.3 ECU. 3.5
I see that you max out ur MAF twice and your mod maf volt looks lean too.

What is your A/F?

Maybe this cause your TPS went back to 0 because ur ECU think something was wrong and dangerous. Just my 2 cents
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Old 04-04-2006, 12:42 PM   #3
tmarcel
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Join Date: Jun 2001
Chapter/Region: South East
Location: Charlotte NC
Default

Quote:
Originally Posted by WRX-Blue-Mica
Code:
4120  +7.0 4.0 81 40 00 +31.4 35.6 +20.2 -6.8 375.00 3.3
4295  +8.8 4.3 82 50 00 +28.7 40.4 +19.7 -8.6 375.00 3.4
4474 +11.3 4.5 79 60 00 +27.0 46.0 +18.5 -11.6 375.00 3.5
4721 +14.7 4.7 71 70 00 +25.2 54.8 +18.8 -11.1 375.00 3.5
4901 +17.6 5.0 70 80 00 +24.4 63.4 +19.9 -10.0 375.00 3.8
5257 +19.8 4.8 65 80 00 +25.2 63.6 +21.0 -9.1 375.00 3.9
4967 +21.2 4.8 61 80 00 +27.7 64.3 +27.6 -9.1 375.00 4.4
5592 +20.8 5.0 56 80 00 +26.0 62.6 +21.7 -7.6 375.00 3.9
4873 +16.6 2.0 1 00 00 +23.4 59.3 ECU. -3.0 ECU. 1.7
4374  +8.8 4.5 1 00 00 +23.6 59.3 ECU. -2.3 ECU. 3.5
I see that you max out ur MAF twice and your mod maf volt looks lean too.

What is your A/F?

Maybe this cause your TPS went back to 0 because ur ECU think something was wrong and dangerous. Just my 2 cents
I noticed that too. I'm not sure if it would be the ECU or not though. Something is weird with it.
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Old 04-04-2006, 01:06 PM   #4
TheMadScientist
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2005 Big red

Default

Quote:
Originally Posted by WRX-Blue-Mica
Code:
4120  +7.0 4.0 81 40 00 +31.4 35.6 +20.2 -6.8 375.00 3.3
4295  +8.8 4.3 82 50 00 +28.7 40.4 +19.7 -8.6 375.00 3.4
4474 +11.3 4.5 79 60 00 +27.0 46.0 +18.5 -11.6 375.00 3.5
4721 +14.7 4.7 71 70 00 +25.2 54.8 +18.8 -11.1 375.00 3.5
4901 +17.6 5.0 70 80 00 +24.4 63.4 +19.9 -10.0 375.00 3.8
5257 +19.8 4.8 65 80 00 +25.2 63.6 +21.0 -9.1 375.00 3.9
4967 +21.2 4.8 61 80 00 +27.7 64.3 +27.6 -9.1 375.00 4.4
5592 +20.8 5.0 56 80 00 +26.0 62.6 +21.7 -7.6 375.00 3.9
4873 +16.6 2.0 1 00 00 +23.4 59.3 ECU. -3.0 ECU. 1.7
4374  +8.8 4.5 1 00 00 +23.6 59.3 ECU. -2.3 ECU. 3.5
I see that you max out ur MAF twice and your mod maf volt looks lean too.

What is your A/F?

Maybe this cause your TPS went back to 0 because ur ECU think something was wrong and dangerous. Just my 2 cents
The thing is the stock ECU will not "see" the maxxed MAF.
First try checking the conection on both TPS sensors. One at the TB and one at the peddle.

TMS
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Old 04-04-2006, 01:25 PM   #5
EAkrish
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Member#: 108617
Join Date: Feb 2006
Chapter/Region: South East
Location: Jax/ Tampa, FL
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2003 WRX
Yellow

Default

you know what, mine did the same thing....... i raised my boost cut and it stopped. not sure if this will help you........
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Old 04-04-2006, 02:51 PM   #6
TheMadScientist
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Join Date: Aug 2002
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2005 Big red

Default

If I remember corectly, the sti Utec uses the peddle TPS sensor as the TPS reference.
I would start looking there.

TMS
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Old 04-04-2006, 08:18 PM   #7
dlowman
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Member#: 22998
Join Date: Aug 2002
Vehicle:
2004 WRX STi
GT35R 572 whp 93/meth

Default

I found the problem. It appears that the peddle tps sensor was getting too high of a voltage. Was making it read inconsistant. We backed the voltage down from that and it seemed to resolve the issue. Wierd for sure.
The utec doesnt let the ecu see the maf so that wouldnt matter.

Thanks for the help guys, this was a bear to figure out lol
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