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Old 03-22-2013, 08:59 PM   #1
tenchu
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Join Date: Jun 2004
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1993 STi RA V LTD
Green

Default 95 WRX cluster pinout? Inop ALT and temp gauge

I have been trying to figure out why my coolant temperature gauge has not been working in my 95 WRX since swapping motor and harness. I seem to have ohm fluctuation at the ECU if that is what the ECU is supposed to be reading from the temp sensor, but the coolant gauge does not move from dead bottom. Coolant seems to be flowing fine.

The alternator also seems to not be charging properly, there's 9v at the hot wire on the alternator, and in the time it took to burp my cooling system and sit for a bit, the battery dropped from 12.1v to 5v.

Does anyone have access to a cluster pinout, or know what the coolant temp sensor wire should be reading at the ECU?
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Old 03-22-2013, 09:55 PM   #2
seangfy
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1993 impreza L ej20g
aquafrost blue

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There is a good pinout on northursillia site if I remember correctly the temp gauge uses its own sensor unrelated to the ecu on the cross over pipe
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Old 03-23-2013, 01:25 AM   #3
pmugabi
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There are two sensors on the crossover pipe. The smaller one with one pin produces the reading for the temp gauge. I have not seen any mention of its resistance vs temperature characteristics in the repair manual.
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Old 03-23-2013, 09:42 AM   #4
69subaru360
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1998 2.5 RS

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The temp gauge you need to run a new wire from the back of the cluster to ground. For whatever reason they never seem to have a good ground on G swaps I've done.
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Old 03-23-2013, 10:27 AM   #5
tenchu
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Quote:
Originally Posted by pmugabi View Post
There are two sensors on the crossover pipe. The smaller one with one pin produces the reading for the temp gauge. I have not seen any mention of its resistance vs temperature characteristics in the repair manual.
Quote:
Originally Posted by seangfy View Post
There is a good pinout on northursillia site if I remember correctly the temp gauge uses its own sensor unrelated to the ecu on the cross over pipe
I knew this too, temp SENSOR and temp SENDER. Brain fart, thanks guys.

Quote:
Originally Posted by 69subaru360 View Post
The temp gauge you need to run a new wire from the back of the cluster to ground. For whatever reason they never seem to have a good ground on G swaps I've done.
Do you happen to know the specific pin that needs an additional ground?
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Old 03-23-2013, 10:44 AM   #6
69subaru360
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1998 2.5 RS

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Quote:
Originally Posted by tenchu View Post
Do you happen to know the specific pin that needs an additional ground?
Just follow the printed circuit back from where the gauge bolts in.
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