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ECU is a suspect? 200 1989

uid 27's pic
posted by  Art Benstein on  Wed May 30 05:22 CST 2018
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last visit: Fri Oct 17 20:10 CST 2014
[RELATED]

Hi Mike,

The graph is as labeled, in volts, not millivolts.

The voltage is measured in-circuit, backprobing the pin at the ECU connector with the car running. Resistance measured with the ECU connector disconnected and (always) with the key off (power disconnected).

The black ECT sensor has two identical thermistors wired to the two pins with a common ground through the sensor body to the cylinder head. If you made the measurement from ignition to fuel harness, you should read 2x the value in the chart.

If you made the voltage readings correctly, you've proved either a poor contact at the ECU connector, or a fault in the ECU, as that voltage is supplied by the ECU from its internal 5V source.

This curve shows what voltage should be versus resistance and how it is derived by the ECU internal source.


--
Art Benstein near Baltimore

Some days you're the bug; some days you're the windshield.






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