Quote:
Originally Posted by dlevitt
With the 4 pin style temp sensor, I believe that the resistance is measured across opposite pins [e.g. 12 o'clock and 6 o'clock] Does this sensor just have one circuit [measure from pin to pin] or two circuits [measure from each pin to ground]?
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If you're talking about your '89 300E, the sensor is actually two identical sensors in the same component. One sensor supplies signal to the KE controller for fuel management, and the other supplies signal to the EZL for ignition management. The 4 pins are indeed measured on the diagonal, pins 1 and 3, then pins 2 and 4. Pins 3 and 4 are ground. The measured resistance for each pair of tests should be identical at the same temperature point shown in the chart above.