timmieg88 0 Posted March 27, 2021 Report Share Posted March 27, 2021 temp guage is not working on my corrado 1995. it has 3 sensors, yellow 4 pin, blue 2 pin, black 2 pin. from what i gather, correct me if im wrong its the blue white wire on the yellow 4 pin connector i need to be looking at? thers no votage on the blue white wire, i assume if it had voltage and was grounded temp should show max? similar to the fuel level sender. is there a dedicated fuse for this circuit? i looked at cluster whires but they are all white so makes it hard to isolate a wire problem. Link to post Share on other sites
Philly-R6 28 Posted March 28, 2021 Report Share Posted March 28, 2021 You are correct - it is the blue wire on the yellow sender. The Black sender is to tell the ECU the temperature. These sensors vary their resistance according to temperature - when cold there will be a big resistance, when hot there will be a low resistance. Guage and Instrument Testing with Special Tool VW 1301 (bentleypublishers.com) To prove the gauge works, short pins 2 and 3 on the yellow connector with a paper clip (or similar) and see if the gauge indicates full hot. Once the gauge works, check the resistance across pins 2 and 3 of the yellow sensor when the engine is cold and again when the engine is warm and see if there is any difference. There won't be 12volts across it. Have fun! Link to post Share on other sites
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