CODE 14 - Coolant Temp Sensor Circuit
Trouble Code 14 indicates that the Coolant Temperature Sensor (CTS) is reporting abnormally high readings. CTS is used to control fuel mixture, timing, idle speed, TCC and EGR operations among others. The thermistor used has a low resistance when hot, rising as the coolant cools. This error then, indicates a very low resistance in the CTS circuit.
The conditions for setting this code are:
NOTE: A default temperature of 111 deg F is used while the error is present.
Typical thermistor resistance values are: