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Home >> Jeep >> 1985 >> Cherokee Base, 2D Utility, 2.1 B, Standard >> Repair and Diagnosis >> Engine Performance >> System >> 2.8L Carburetor CEC System >> Operation >> Data Sensors >> Coolant Temperature Sensor (CTS)

Coolant Temperature Sensor (CTS)

The CTS is located in coolant passage. The ECM sends a 5 volt signal to the CTS. This 5 volt signal is reduced by the resistance of the CTS and a voltage signal goes back to the ECM. When coolant temperatures are low, CTS resistance is high and a low voltage signal is sent to the ECM. When coolant temperatures are high, CTS resistance is low and a higher voltage signal is sent to the ECM. Coolant sensor problems may set a Code "14" or "15".

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