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ENGINE COOLANT TEMPERATURE SENSORS

. . Chapter 14. Temperature Sensors. Automotive Fuel and Emission Control Systems. Engine Coolant Temperature Sensors The ECT sensor is used as an important input for the following: Idle air control (IAC) position Oxygen sensor closed loop times Canister purge on/off times Idle spe

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ENGINE COOLANT TEMPERATURE SENSORS

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    2. ENGINE COOLANT TEMPERATURE SENSORS Computer-equipped vehicles use an engine coolant temperature (ECT) sensor. When the engine is cold, the fuel mixture must be richer to prevent stalling and engine stumble.

    4. TEMPERATURE SENSORS

    5. ECT CIRCUIT

    7. TEMPERATURE GRAPH

    8. STEPPED ECT CIRCUITS Some vehicle manufacturers use a step-up resistor to effectively broaden the range of the ECT sensor.

    9. STEPPED ECT CIRCUITS

    10. TESTING THE ENGINE COOLANT TEMPERATURE SENSOR Testing the Engine Coolant Temperature by Visual Inspection Properly filled cooling system Proper pressure maintained by the radiator cap Proper antifreeze-water mixture Proper operation of the cooling fan Testing the ECT Using a Multimeter Testing the ECT Sensor Using a Scan Tool

    14. INTAKE AIR TEMPERATURE SENSOR The intake air temperature (IAT) sensor is a negative temperature coefficient (NTC) thermistor that decreases in resistance as the temperature of the sensor increases. The IAT sensor can be located in one of the following locations: In the air cleaner housing In the air duct between the air filter and the throttle body Built into the mass air flow (MAF) or air flow sensor Screwed into the intake manifold where it senses the temperature of the air entering the cylinders

    15. IAT CIRCUIT

    17. WHAT EXACTLY IS AN NTC SENSOR?

    19. TEMPERATURE SENSOR DIAGNOSTIC TROUBLE CODES

    20. EGR TEMPERATURE CIRCUIT

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