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question on how ECT sends info to ECU 200

posted by  jkordzi on  Thu Jul 3 02:56 CST 2003
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last visit: Wed Sep 12 02:43 CST 2001
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I've been trying to track down a hot restart/running problem and was studying the wiring from the ECT to the ECU. The ECT has only two leads - one to the ignition computer and the other to the ECU, both of which use the engine coolant temperature in their algorithms. It grounds through the sender. I thought that the ECU sends the ECT about 5 volts and then interprets what it gets back as a temperature (due to the change in resistance in response to the coolant temperature). How does it do that through one wire? Do I have this wrong?






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