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Old 08-14-2013, 04:36 PM   #1
yebokmj
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Member#: 2213
Join Date: Aug 2000
Chapter/Region: South East
Location: Raymond, NH USA
Vehicle:
1995 Impreza w/EJ257
Brilliant Red

Default 1 Wire or 2 wire to Three wire coolant temp sensor conversion info

I came across this problem with my MY05 LGT swap that the coolant temp sensor is two wire and only gives the ecu the temp and then the gauge cluster gets it's temp info via the can system from the ecu. On older Impreza that use the two wire setup for ecu there is a second single wire sensor for the gauge cluster. Now the newer EJ255 and EJ257 and possibly others, coolant cross over pipe doesn't have a spot for the second sensor so you need to convert to the three wire sensor depending on your swap. The connector is not available through Subaru for the sensor. A little research has provided me with a Toyota connector that will snap right into the Subaru sensor and will also receive the pins from the two wire connector. Only the third wire needs to be purchased from Toyota or salvaged from one of your other connectors.

Here is the Subaru Part number:
Sensor assembly-temperature, 22630AA161

Here is the Toyota Part number
Housing, Connector 90980-11451
Pic to Follow

I don't know if this will help others but I thought I would post it up anyways.
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Old 09-01-2013, 03:26 AM   #2
03WRXer
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I pulled my intake manifold off my ej207 JDM spec-c sti motor and broke the harness plug that plugs into the three wire temp sensor. Can you post a pic of the Toyota plug you found? I googled that part number, but no picture of the plug is available.

I hope this harness connector plug will work!
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Old 09-01-2013, 08:20 AM   #3
yebokmj
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Join Date: Aug 2000
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Location: Raymond, NH USA
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1995 Impreza w/EJ257
Brilliant Red

Default

Here are the pictures, I never bothered posting since there seemed to be no interest.


The connector when you get it is slightly apart in the front so you can slide your pins in and then you push it together to secure them in the connector. This seen in the top picture where it looks uneven like the top part is sticking out to much.
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Old 09-01-2013, 11:08 AM   #4
03WRXer
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Thank you. That's just what I need.
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Old 09-04-2013, 10:49 PM   #5
03WRXer
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Do you know which wire goes where on the temp sensor? My wires got pulled out of the plug, so I don't know where they go. I'm gonna look for a wire diagram I guess.
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Old 11-04-2013, 03:49 PM   #6
venom225
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07 STi
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does anyone know which wire goes were or if it matters?
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Old 11-05-2013, 07:21 PM   #7
venom225
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cant find the wiring diagram anywere guess ill figure it out
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Old 11-05-2013, 08:25 PM   #8
yebokmj
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Member#: 2213
Join Date: Aug 2000
Chapter/Region: South East
Location: Raymond, NH USA
Vehicle:
1995 Impreza w/EJ257
Brilliant Red

Default

Here is for an MY04 STI, I don't know if other years are different colors.
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Old 11-05-2013, 08:55 PM   #9
venom225
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pm'ed you thats what I been looking for!
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Old 05-14-2014, 08:43 AM   #10
no694terry
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If it makes you feel better, this may help me. I have a 98 and tried tapping my coolant signal for Emanage but messed up the ECU signal. So my plan was to add a 3rd sensor for my emanage. This sensor is two in one. I leave the stock single wire sensor for the dash gauge, the 3 wire will replace my two wire for the ECU and now i have a third signal for the emanage.

Right??
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