Question about 1993 GMC Sierra
The Engine Coolant Temperature (ECT) sensor is mounted in the intake manifold and sends engine temperature information to the ECM. The ECM supplies 5 volts to the coolant temperature sensor circuit. The sensor is a thermistor which changes internal resistance as temperature changes. When the sensor is cold (internal resistance high), the ECM monitors a high signal voltage which it interprets as a cold engine. As the sensor warms (internal resistance low), the ECM monitors a low signal voltage which it interprets as warm engine.
Fig. 1: View of the Engine Coolant Temperature (ECT) sensor Fig. 2: Engine Coolant Temperature (ECT) sensor locationTESTING
See Figures 3 and 4
Posted on Oct 01, 2008
If the engine seems to run OK, and no Check Engine Light, The sender unit for the gauge (separate sensor) may be bad. On most 4.3L engines, it is located on the driver side rear of the engine. Disconnecting the sender connector (engine warm and Ign. switch in run) should send the gauge to zero, and grounding should send the gauge to 260. If it doesn't, the wiring or gauge could have problems.
Posted on Jun 08, 2009
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