Circuit Description

WARNING: This page is about a different variant/trim than selected.

An engine coolant temperature (ECT) sensor monitors the temperature of the coolant. This input is used by the engine control module (ECM) for engine control and as an enabling criteria for some diagnostics.

The air flow into the engine is accumulated and used to determine if the vehicle has been driven within the conditions that would allow the engine coolant to heat up normally to the Closed Loop temperature. If the coolant temperature does not increase normally or does not reach the Closed Loop temperature, the diagnostics that use engine coolant temperature as enabling criteria may not run when expected.

This DTC will run continuously. The ECM calculates a modeled temperature using startup ECT, mass air flow (MAF), intake air temperature (IAT) and engine speed.

If the ECM detects the calibrated amount of air flow and engine run time at any time is equal to a predetermined value, and the engine coolant is not within range of the calibrated temperature, DTC P0116 sets.