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Home >> Chevrolet >> 2002 >> Express 1 Ton Van V8-6.5L DSL Turbo VIN F >> Repair and Diagnosis >> Engine, Cooling and Exhaust >> Cooling System >> Testing and Inspection >> Scan Tool Testing and Procedures >> Scan Tool Data Definitions
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Scan Tool Data Definitions

Scan Tool Data Definitions
ECT Sensor-Range: -40°C to 150°C (-40°F to 302°F): The PCM applies 5.0 volts to the ECT sensor circuit. The sensor is a thermistor, which changes internal resistance as the engine temperature changes. When the sensor is cold (internal resistance high), the PCM senses a high signal voltage and interprets the voltage as a cold engine. As the sensor warms (internal resistance decreases), the voltage signal decreases and the PCM interprets the lower voltage as a warm engine.
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