P0119

DTC P0119 Engine Coolant Temperature Circuit Intermittent

DESCRIPTION
The engine coolant temperature sensor (ECTS) is located in the engine coolant passage of the cylinder head for detecting the engine coolant temperature. The ECTS uses a thermistor whose resistance changes with the temperature. The electrical resistance of the ECTS decreases as the temperature increases, and increases as the temperature decreases. The reference 5 V in the ECM is supplied to the ECTS via a resistor in the ECM. That is, the resistor in the ECM and the thermistor in the ECTS are connected in series. When the resistance value of the thermistor in ECTS changes according to the engine coolant temperature, the output voltage also changes. During cold engine operation the ECM increases the fuel injection duration and control the ignition timing using the information of engine coolant temperature to avoid engine stall and improve driveability.

DTC Detecting Condition:

Specifications:

Schematic Diagram:

Signal Waveform:

Step 1:

Step 2 - 3:

INSPECTION PROCEDURE