DTC P0116: Engine Coolant Temperature (ECT) Sensor Circuit Range/Performance Problem: General Description
The engine control module (ECM) supplies voltage to the engine coolant temperature (ECT) signal circuit (about 5 V) through a pull-up resistor. As the engine coolant cools, ECT sensor resistance increases, and the ECM detects a high signal voltage. As the engine coolant warms, ECT sensor resistance decreases, and the ECM detects a low signal voltage.
If the ECT output voltage after driving a set time after starting the engine does not reach a set temperature, or when the difference between the ECT output voltage when driving and the output voltage of the ECT after the engine is stopped a set time does not change a certain amount, a malfunction is detected and a DTC is stored.
MONITOR DESCRIPTION CHART
| Execution | Once per driving cycle |
| Sequence | None |
| Duration | 10 minutes or more |
| DTC Type | Two drive cycles, MIL ON |
ENABLE CONDITIONS CHART
| Condition | Minimum | Maximum |
|---|---|---|
| Elapsed time after starting the engine | 10 seconds | - |
| Fuel feedback | Other than during fuel cut-off operation | |
| No active DTCs | ECM, A/F Sensor, A/F Sensor Heater, MAP, CKP, CMP, ECT, BARO, IAC, EGR, EVAP, VTEC System, Fuel System, Misfire | |
| Others | With a completely cooled engine (one that has been off for at least 6 hours): Judgment is made after the engine has been run for at least 10 minutes, turned off for at least 10 seconds, then started and run again for at least 10 seconds. | |
| With a partially cooled engine (one that has been off for less than 6 hours): Judgment is made after the engine has been run for at least 10 minutes, turned off for at least 150 minutes then started and run again for at least 10 seconds. | ||