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Home >> Chevrolet >> 1992 >> Chevy Van G20, 5.7 K >> Repair and Diagnosis (Single Page) >> Engine Performance >> Theory and Operation >> Engine Controls - Theory & Operation >> Computerized Engine Controls (Gasoline) >> Input Devices >> Coolant Temperature Sensor (CTS)
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Coolant Temperature Sensor (CTS)

The CTS is a thermistor (temperature sensitive resistor) located in an engine coolant passage. The ECM supplies and monitors a 5-volt signal to CTS. This monitored 5-volt signal is then modified by resistance of the CTS. When coolant temperatures are low, CTS resistance is high and the ECM sees a high monitored voltage signal. When coolant temperatures are high, CTS resistance is low and the ECM sees a low monitored voltage. When fully warmed, CTS should reflect a temperature of at least 185°F (85°C).

Coolant temperature input is used in the control of fuel delivery, ignition timing, idle speed, emission control devices and converter clutch application. A CTS which is out of calibration will not set a trouble code, but can cause fuel delivery and driveability problems. A coolant sensor circuit problem should set a related trouble code.

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