problem with utec need your help

[dlowman]

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

[WRX-Blue-Mica]

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

[tmarcel]

Originally Posted by WRX-Blue-Mica

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.

[TheMadScientist]

Originally Posted by WRX-Blue-Mica

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

[EAkrish]

you know what, mine did the same thing....... i raised my boost cut and it stopped. not sure if this will help you........

[TheMadScientist]

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

TMS

[dlowman]

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