Circuit Description

Coolant Temperature Sensor (CTS) is a thermistor sensor that monitors water temperature. Code is set when ECM detects a open or short circuit. Possible causes are:

CTS sensor open or short circuit.
CTS sensor malfunction.
ECM malfunction.

NOTE: If Codes P0110, P0115 and P0120 are output together, inspect ECM terminal "E2" (ground) circuit. Repair as needed. See wiring diagram in WIRING DIAGRAMS article.