P0116
DTC P0116CIRCUIT DESCRIPTION
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. If the coolant temperature does not increase normally, 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), and Engine Run Time.
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 the range of the calibrated temperature, DTC P0116 sets.
CONDITIONS FOR RUNNING THE DTC
The engine is cranking or running.
CONDITIONS FOR SETTING THE DTC
- The calibrated amount of air flow at any time has been met.
- The calibrated amount of engine run time at any time has been met.
- The actual ECT deviates by more than 12°C (22°F) from a predetermined calibrated ECT.
ACTION TAKEN WHEN THE DTC SETS
- The control module illuminates the malfunction indicator lamp (MIL) on the second consecutive ignition cycle that the diagnostic runs and fails.
- The control module records the operating conditions at the time the diagnostic fails. The first time the diagnostic fails, the control module stores this information in the Failure Records. If the diagnostic reports a failure on the second consecutive ignition cycle, the control module records the operating conditions at the time of the failure. The control module writes the operating conditions to the Freeze Frame and updates the Failure Records.
CONDITIONS FOR CLEARING THE MIL/DTC
- The control module turns OFF the malfunction indicator lamp (MIL) after 3 consecutive ignition cycles that the diagnostic runs and does not fail.
- A current DTC, Last Test Failed, clears when the diagnostic runs and passes.
- A history DTC clears after 40 consecutive warm-up cycles, if no failures are reported by this or any other emission related diagnostic.
- Clear the MIL and the DTC with a scan tool.
TEST
