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Board resoldered, Temp gauge still doesn't work!! (also strange lights in the dash) 200 1987

posted by  Don Foster on  Thu Aug 8 03:47 CST 2002
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last visit: Sun Oct 5 11:53 CST 2014
[RELATED]

You're sure you're at the right temp sensor? Under intake #2, single wire sensor, yellow wire? If you saw two wires, you could be fiddling with the FI sensor by mistake.

When the (gauge) sensor is at very high resistance (like infinite ohms), it tells the gauge it's cold. When the sensor is at very low resistance (like grounded, zero ohms) it tells the gauge it's very hot.

"...'TCB shuffle,' by going up halfway, stopping then turning back down..."

Hmm.... This could be bad parts on the comp board. If it were mine, I'd drop in a new IC and transistor (got a bag of 'em). This has worked for me, but others tried it unsuccessfully. It could be that they did it wrong, that they couldn't solder, that the parts were bad (or wrong), or that the problem was elsewhere.

"Looks like i'm pulling the instrument cluster again..."

Good thing it only takes 90 seconds....;-)

On an '87 car, be very alert for a bad engine harness, which includes the single yellow wire to the temperature sensor.
--
Don Foster (near Cape Cod, MA)






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