Circuit Description

The CTS is a thermistor that monitors water temperature. CTS is located next to heater hose connection on side of cylinder head. 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 22, 24, 31 and 41 are output together, inspect ECM terminal E2 (ground) circuit. Repair as needed. See wiring diagram in the WIRING DIAGRAMS article.