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ECU's temp sensor circuit 200 1985

posted by  Art Benstein on  Fri Dec 27 06:06 CST 2024
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last visit: Fri Oct 17 20:10 CST 2014
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Thank you for the kind words Richard.

You're right, the ECU temp sensor gets measured using a regulated 5V source, so you can backprobe that wire to the ECU's pin 2 (comfortably from inside the cabin by the way) to watch its performance during the engine warmup, thus verifying the sensor's stability over the range and all the wiring.

Here's the circuit for the LH2.2 -544 ECU. Yours may be an earlier version, but I believe the circuit for this function is identical. It uses the same sensor as the 83/84 LH2.0 system used, single element one of the two pins grounded.



So, if you disconnect the wire and measure the voltage, you'll see a little less than 5 volts due to the voltage divider fixed at the ADC input.

Hey, it is good to see the Brickboard functioning again!!
--
Art Benstein near Baltimore

What's the definition of a will? It's a dead giveaway.






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New Investigating Running temperature lower than expected [200][1985]
posted by  ricbelley  on Fri Dec 13 14:33 CST 2024 >


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