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xsparc · 03-05-2008, 08:34 PM

Ok i got the temp guage working for me. If your temp guage is reading max hot then try this.

I dont know what the normal op temp for the 240 is but im guessing its about 90-110c since the thermistat opens around 70c.

I ran the car up to 97C and took a measurement of the sender, mine read 24 ohms. then i ran it up to 115C, the sender then read 17ohms.

So we want the guage to read in the normal position at 24ohms and about 3/4 at 17 ohms. Now the fun part... remove the board from the back of the s15 cluster and flip it over.

Locate R19, its a large 330ohm resister near the top left. This is the temp guage ref resistor, since the guage is reading high, we need to lower this. You can replace it or put another one in parallel. I found that if you add a 150 ohm resister in parallel it will read just about right on target.

You can adjust it if you want to find a good spot for you. I first tried another 330ohm, but it didnt read hot till around 125c.

If you guage works fine then you dont need this, maybe i just had a bad guage or something since the s13 and s15 senders have the same ranges according to the FSM.

03-05-2008, 08:34 PM	#28
xsparc Zilvia Junkie Join Date: Dec 2002 Location: san diego area - esco Posts: 461 Trader Rating: (0)	Ok i got the temp guage working for me. If your temp guage is reading max hot then try this. I dont know what the normal op temp for the 240 is but im guessing its about 90-110c since the thermistat opens around 70c. I ran the car up to 97C and took a measurement of the sender, mine read 24 ohms. then i ran it up to 115C, the sender then read 17ohms. So we want the guage to read in the normal position at 24ohms and about 3/4 at 17 ohms. Now the fun part... remove the board from the back of the s15 cluster and flip it over. Locate R19, its a large 330ohm resister near the top left. This is the temp guage ref resistor, since the guage is reading high, we need to lower this. You can replace it or put another one in parallel. I found that if you add a 150 ohm resister in parallel it will read just about right on target. You can adjust it if you want to find a good spot for you. I first tried another 330ohm, but it didnt read hot till around 125c. If you guage works fine then you dont need this, maybe i just had a bad guage or something since the s13 and s15 senders have the same ranges according to the FSM. Last edited by xsparc; 10-14-2008 at 05:45 PM..