P0116

DTC P0116 Engine Coolant Temperature Circuit Malfunction (Open/Short)

DESCRIPTION
The Engine Coolant Temperature (ECT) sensor is located in a coolant passage of the cylinder head. The ECT sensor is a variable resistor whose resistance changes as the temperature of the engine coolant flowing past the sensor changes. When the coolant temperature is low, the sensor resistance is high; when the coolant temperature is high, the sensor resistance is low. The Powertrain Control Module (PCM) checks ECT voltage fifty times per second and uses the information to help adjust the fuel injector pulse width and ignition timing. When the temperature sensed is very cold, the PCM enriches the fuel mixture.

Troubleshooting Guide:

Circuit Diagram:

Test Procedure Part 1:

Test Procedure Part 2: