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Home >> Oldsmobile >> 1997 >> Achieva L4-144 2.4L DOHC VIN T SFI >> Repair and Diagnosis >> Powertrain Management >> Computers and Control Systems >> Coolant Temperature Sensor/Switch (For Computer) >> Testing and Inspection
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Coolant Temperature Sensor/Switch (For Computer): Testing and Inspection

Engine Coolant Temperature Sensor

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 Engine Coolant Temperature (ECT) and Intake Air Temperature (IAT) temperatures should be close to each other. A hard fault in the ECT sensor circuit should set either a Diagnostic Trouble Codes (DTCs) P0117 or P0118. Refer to Specifications for sensor resistance values relative to temperature.
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