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Figure 15.2 A typical ECT sensor temperature versus voltage curve.

Figure 15.1 A typical engine coolant temperature (ECT) sensor. ECT sensors are located near the thermostat housing on most engines. Figure 15.2 A typical ECT sensor temperature versus voltage curve.

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Figure 15.2 A typical ECT sensor temperature versus voltage curve.

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  1. Figure 15.1 A typical engine coolant temperature (ECT) sensor. ECT sensors are located near the thermostat housing on most engines.

  2. Figure 15.2 A typical ECT sensor temperature versus voltage curve.

  3. Figure 15.3 A typical two-step ECT circuit showing that when the coolant temperature is low, the PCM applies a 5-volt reference voltage to the ECT sensor through a higher resistance compared to when the temperature is higher.

  4. Figure 15.4 The transition between steps usually occurs at a temperature that would not interfere with cold engine starts or the cooling fan operation.

  5. Figure 15.5 Measuring the resistance of the ECT sensor.

  6. Figure 15.6 When the voltage drop reaches approximately 1.2 volts, the PCM turns on a transistor.

  7. Figure 15.7 An ECT sensor being tested using a digital meter set to DC volts and in record mode.

  8. Figure 15.8 The IAT sensor on this General Motors 3800 V-6 engine is in the air passage duct between the air cleaner housing and the throttle body.

  9. Figure 15.9 A typical temperature sensor circuit.

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