Manuals through 2025 now available!
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LEMON is the spiritual successor to CHARM, I recommend you try it!
Link:
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lemon-manuals.org.ua
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Coolant Temperature Sensor/Switch (For Computer): Testing and Inspection
A scan tool displays the engine temperature in degrees Celsius. After the engine is started, the temperature should rise steadily to about 90°C (194°F) then stabilize when the thermostat opens. If the engine has not been run for several hours (overnight), the
ECT and
IAT temperatures should be close to each other. A hard fault in the ECT sensor circuit should set either a DTC P0117 or P0118. The DTC tables also contain a table to check for sensor resistance values relative to temperature.