DTC 14

Code 14 - Coolant Sensor Circuit:

Wiring Diagram For Code 14 - Coolant Sensor Circuit:

CODE 14 - COOLANT SENSOR CIRCUIT (SIGNAL VOLTAGE LOW)


Circuit Description:

The coolant temperature sensor uses a thermistor to control the signal voltage to the ECM. The ECM applies a voltage on CKT 410 to the sensor. When the coolant is cold, the sensor (thermistor) resistance is high, therefore, the ECM will see high signal voltage on CKT 410.

As the coolant warms, the sensor resistance becomes less and the voltage drops. At normal operating temperature, the the voltage will measure about 1 to 1.5 volts at the ECM terminal C10.

Code 14 will set if signal voltage indicates a coolant temperature above 135~C (275~F) for more than 10 (ten) seconds.



Coolant temperature is one of the inputs used to control:

^ Exhaust gas recirculation
^ Fuel delivery
^ Spark Timing (EST)
^ Idle (IAC)
^ Convertor Clutch (TCC)
^ Air Management

Test Description:

1. Checks to see if ECM recognizes whether the problem is still present or is an intermittent one.