View Full Version : ECU and Coolant temp gauge question.
C.Plavan
07-27-2014, 09:15 AM
Hello All,
I'm wanting to replace my water temp gauge with an aftermarket unit. Can I just replace the sender at the stock location without causing any ECU problems (bypassing/removing stock sender wiring)?
I believe the water temp gauge is behind the Alt, further back from the oil pressure idiot light correct?
metalmaker12
07-27-2014, 09:19 AM
Why not keep it and run another port to your other gauge to bypass the issues
C.Plavan
07-27-2014, 09:29 AM
Why not keep it and run another port to your other gauge to bypass the issues
That's what I'm asking. I'm seeing if it would cause problems if removed for it an aftermarket sender/gauge. I will not have the stock dash for long. I have the aluminum coolant pipes, so installing water temp sensor adapter will be really tight.(http://www.rallysportdirect.com/Mishimoto-MMWHS-38-BK-Water-Temperature-Sensor-Adapter-Black-38mm&source=GoogleBase?gclid=CjwKEAjwxtKeBRDMzoeQmYn5uH cSJACGCF3D0PzFr9D1DI4CFB26TxHPb6C8m2wW7rYeTabhvSDN GhoC2dfw_wcB)
Not sure if bypassing the throttle body coolant hoses, adding a 2 barb with 1/8npt Tee for sender would be the best spot. Thoughts?
wallace18
07-27-2014, 10:37 AM
The stock ecu needs the temp sender on certain years the sender does the ecu and gauge. There are plenty of places to mount an aftermarket unit separately IMO.
Evan78
07-27-2014, 05:17 PM
I know at least some of the stock Subaru ECUs have compensation tables for coolant temp (it adjusts timing I think).
metalmaker12
07-27-2014, 05:42 PM
That's what I'm asking. I'm seeing if it would cause problems if removed for it an aftermarket sender/gauge. I will not have the stock dash for long. I have the aluminum coolant pipes, so installing water temp sensor adapter will be really tight.(http://www.rallysportdirect.com/Mishimoto-MMWHS-38-BK-Water-Temperature-Sensor-Adapter-Black-38mm&source=GoogleBase?gclid=CjwKEAjwxtKeBRDMzoeQmYn5uH cSJACGCF3D0PzFr9D1DI4CFB26TxHPb6C8m2wW7rYeTabhvSDN GhoC2dfw_wcB)
Not sure if bypassing the throttle body coolant hoses, adding a 2 barb with 1/8npt Tee for sender would be the best spot. Thoughts?
Yeah it would cause problems, you would need to trick the ecu coolant temp values, I have never seem this done on the oem temp sensor. I guess any thing is possible, but wouldn't be my first choice. For and easy tap in add a npt coupler at the heatercore loop.
C.Plavan
07-27-2014, 07:17 PM
Yeah it would cause problems, you would need to trick the ecu coolant temp values, I have never seem this done on the oem temp sensor. I guess any thing is possible, but wouldn't be my first choice. For and easy tap in add a npt coupler at the heatercore loop.
Sounds good. I didn't even think of the heater core loop!