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Old 03-21-2006, 08:21 PM   #1
WRXDriftR
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Join Date: Jun 2004
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6MT, VF43

Default EGT Sensor (uppipe) with AP Stage2??

Hey,
Im currently running AP stage2 on a 2004 wrx. I have an STi catless uppipe with no EGT sensor plugged in. There is the resistor in the harness to keep the ecu happy (even if its not needed).

Im about to purchase the Scanmaster3 from Full Throttle and it would allow me to read Exhaust Gas Temps...if i had the sensor still in the uppipe.
Heres my question: does the AP stage2 programming cancel out all signals from this sensor or does it just ignore the CEL that the EGT sensor throws?

If i took my stock EGT sensor and had a hole tapped in my exhaust header, could I hook it back up so the ECU gets signals from it again? Will the Scanmaster then be able to read the realtime EGT readings??
I hope my theory is correct that it will work.
Any help is appreciated!
Thanks,
~Chris

EDIT:
P0545 - Exhaust Gas Temperature Sensor Circuit Low
P0546 - Exhaust Gas Temperature Sensor Circuit High
P1301 - Misfire Detected (High Temperature Exhaust Gas) **
P1312 - Exhaust Gas Temperature Sensor Malfunction **
P1544 - Exhaust Gas Temperature Too High **

These are the codes defeated under Stage2 mapping. It says nothing about removing normal functioning signals from the EGT sensor, so i assume it will work to re-install it in the exhaust header.
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Last edited by WRXDriftR; 03-21-2006 at 08:26 PM.
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Old 03-21-2006, 08:28 PM   #2
Call_me_Tom
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Quote:
Originally Posted by WRXDriftR
does the AP stage2 programming cancel out all signals from this sensor or does it just ignore the CEL that the EGT sensor throws?
It turns off the CEL warning.
Quote:
Originally Posted by WRXDriftR
If i took my stock EGT sensor and had a hole tapped in my exhaust header, could I hook it back up so the ECU gets signals from it again?
The ECU wouldn't read it properly as it is assuming the signal is coming from your UP and not your header. Get a aftermarket sensor and use that with a gauge or something simular but not with the ECU.
Quote:
Originally Posted by WRXDriftR
Will the Scanmaster then be able to read the realtime EGT readings??
Don't know that one.
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Old 03-21-2006, 08:29 PM   #3
Quack
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teh AP sets the EGT value to an appropriate level. i don't know if you can work around the AP's "fix"
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Old 03-21-2006, 11:58 PM   #4
WRXDriftR
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ok, ill probably get a standalone EGT sensor and gauge then. hmmm....
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Old 03-22-2006, 09:15 AM   #5
Hawke
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Quote:
Originally Posted by Quack
teh AP sets the EGT value to an appropriate level. i don't know if you can work around the AP's "fix"
Wrong, the AP only prevents the CEL from comming on. The AP does not mess with the readings. If the scanner can read the EGT values on a stock car it will one with the AP installed.
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Old 03-24-2006, 12:58 AM   #6
distorto
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Quote:
Originally Posted by WRXDriftR
ok, ill probably get a standalone EGT sensor and gauge then. hmmm....
if you can find a egt sensor without a gauge, you can plug it into the scanmaster...
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