Water temp gauge wiring bypass?

Aspen_2.5RS · 01-20-2005, 11:36 PM

Alright, here's a little background. This is an 02 usdm wrx motor in a 95L. I was having starting issues and it turned out to be the wire going from the ecu to the factory water temp gauge. Dale Teague cut the wire and it cured the starting problem (car now fast idles at start up like it should and cranks right up), but the gauge will still slowly creep up to full hot in a few minutes. There is a difference in the way the sensors are hooked up from a 95L /02 WRX. I'm using the 95L cluster btw.

I'm now running a VDO water temp gauge, but I'd like to get the factory gauge to work as well.

What I want to know is if I can look into the fsm and find what color the sensor wire is on the sensor and run that straight to the gauge (bypassing the ecu)?

Any information would be appreciated.

Thanks,

IhatewiringandsuckatitCam

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Zephyr · 01-21-2005, 01:03 AM

You have to ground the Red and Green wire that comes off of the gauge cluster at pin 3 plug i17. Hint the fourth pin in is White and Green and goes to the temp sensor. For some reason on the older imprezas the clusters are grounded to the ECM.

Z

Homemade WRX · 01-21-2005, 01:14 AM

yeah, like zephyr said you missed a ground...I had that problem initially until I pulled out the multimeter...then is was quite evident

Aspen_2.5RS · 01-21-2005, 01:27 PM

Quote:

Originally Posted by Zephyr250

You have to ground the Red and Green wire that comes off of the gauge cluster at pin 3 plug i17. Hint the fourth pin in is White and Green and goes to the temp sensor. For some reason on the older imprezas the clusters are grounded to the ECM.

Z

So, b/c that one ground wasn't hooked up it causes the car dump tons of fuel in at start up, not fast idle, and make it where it took about 10-15 tries to start?

I just want to make sure this is going to fix the gauge before I track down the clipped wire and ground out the red/green wire.

Also, my gas mileage hasn't been so great lately since it turned cold. When we did the swap we didn't swap the gas tank so I know some of these codes are going to be there. I had them read yesterday:
Fuel temp sensor A circuit high input (gas tank)
Fuel level sensor high input (gas tank I think)
Evap Emission Control Syst. Vent control circuit open (no black box etc.)
Fuel Level circuit range/performance <--- This is the one I'm not sure about. Is this from not having the gas tank or is something screwed?

Thanks,

Cam

Aspen_2.5RS · 01-22-2005, 03:47 PM

Alright, I grounded the red and green wire. I didn't mess with that other wire that was cut b/c of the way it acted before.

It appears the temp gauge is fixed!!

Thank you.

Cam

Zephyr · 01-22-2005, 09:37 PM

awsome. glad to hear that my advice worked for you.

Z

01-20-2005, 11:36 PM	#1
Aspen_2.5RS Scooby Guru Member#: 3310 Join Date: Dec 2000 Chapter/Region: South East Location: SC	Water temp gauge wiring bypass? Alright, here's a little background. This is an 02 usdm wrx motor in a 95L. I was having starting issues and it turned out to be the wire going from the ecu to the factory water temp gauge. Dale Teague cut the wire and it cured the starting problem (car now fast idles at start up like it should and cranks right up), but the gauge will still slowly creep up to full hot in a few minutes. There is a difference in the way the sensors are hooked up from a 95L /02 WRX. I'm using the 95L cluster btw. I'm now running a VDO water temp gauge, but I'd like to get the factory gauge to work as well. What I want to know is if I can look into the fsm and find what color the sensor wire is on the sensor and run that straight to the gauge (bypassing the ecu)? Any information would be appreciated. Thanks, IhatewiringandsuckatitCam * Registered users of the site do not see these ads.

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01-21-2005, 01:03 AM	#2
Zephyr Scooby Specialist Member#: 3362 Join Date: Dec 2000 Location: On the Podium w/ a trophy girl Vehicle: 1985 I've wired a Few cars in my day	You have to ground the Red and Green wire that comes off of the gauge cluster at pin 3 plug i17. Hint the fourth pin in is White and Green and goes to the temp sensor. For some reason on the older imprezas the clusters are grounded to the ECM. Z

01-21-2005, 01:14 AM	#3
Homemade WRX Scooby Guru Member#: 33782 Join Date: Mar 2003 Chapter/Region: MAIC Location: 3MI Racing LLC Vehicle: 96 bastard child search FIRST, then PM!!!	yeah, like zephyr said you missed a ground...I had that problem initially until I pulled out the multimeter...then is was quite evident

01-22-2005, 03:47 PM	#5
Aspen_2.5RS Scooby Guru Member#: 3310 Join Date: Dec 2000 Chapter/Region: South East Location: SC	Alright, I grounded the red and green wire. I didn't mess with that other wire that was cut b/c of the way it acted before. It appears the temp gauge is fixed!! Thank you. Cam

01-22-2005, 09:37 PM	#6
Zephyr Scooby Specialist Member#: 3362 Join Date: Dec 2000 Location: On the Podium w/ a trophy girl Vehicle: 1985 I've wired a Few cars in my day	awsome. glad to hear that my advice worked for you. Z