DTC P0116 Engine Coolant Temperature Circuit Range / Performance Problem |
for Preparation Click here
DESCRIPTION
Refer to DTC P0115 (Click here).DTC No. | DTC Detection Condition | Trouble Area |
P0116 | Either condition is met (2 trip detection logic):
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MONITOR DESCRIPTION
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Engine coolant temperature sensor cold start monitor
When a cold engine start is performed and then the engine is warmed up, if the engine coolant temperature sensor value does not change, it is determined that a malfunction has occurred. If this is detected in 2 consecutive driving cycles, the MIL is illuminated and a DTC is stored.
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Engine coolant temperature sensor soak monitor
If the engine coolant temperature sensor value does not change after the warmed up engine is stopped and then the next cold engine start is performed, it is determined that a malfunction has occurred. If this is detected in 2 consecutive driving cycles, the MIL is illuminated and a DTC is stored.
MONITOR STRATEGY
Related DTCs | P0116: Engine coolant temperature sensor cold start monitor P0116: Engine coolant temperature sensor soak monitor |
Required Sensors/Components (Main) | Engine coolant temperature sensor |
Required Sensors/Components (Related) | None |
Frequency of Operation | Once per driving cycle |
Duration | -: Cold start monitor 10 seconds: Soak monitor |
MIL Operation | 2 driving cycles |
Sequence of Operation | None |
TYPICAL ENABLING CONDITIONS
Monitor runs whenever following DTCs not stored | P0112, P0113 (Intake Air Temperature Sensor) P0115, P0117, P0118 (Engine Coolant Temperature Sensor) P0125 (Insufficient Coolant Temperature for Closed Loop Fuel Control) P0128 (Thermostat) |
Battery voltage | 10.5 V or higher |
Time after engine start | 1 second or more |
Engine coolant temperature at engine start | Below 60°C (140°F) |
Soak time | 0 seconds or more |
Accumulated mass air flow | 5476 g or more |
Engine | Running |
Fuel cut | OFF |
Difference between engine coolant temperature at engine start and intake air temperature | Less than 40°C (72°F) |
Monitor runs whenever following DTCs not stored | P0112, P0113 (Intake Air Temperature Sensor) P0115, P0117, P0118 (Engine Coolant Temperature Sensor) P0125 (Insufficient Coolant Temperature for Closed Loop Fuel Control) P0128 (Thermostat) P2610 (Soak Timer) |
Battery voltage | 10.5 V or higher |
Engine | Running |
Soak time | 5 hours or more |
Either condition (a) or (b) met | - |
(a) Engine coolant temperature | 60°C (140°F) or higher |
(b) Accumulated mass air flow | 10952 g or more |
TYPICAL MALFUNCTION THRESHOLDS
Engine coolant temperature sensor value change | Less than 5°C (9°F) |
Difference between current engine coolant temperature sensor value and previous engine coolant temperature sensor value when engine stopped | Less than 5°C (9°F) (varies with last trip ECT) |
COMPONENT OPERATING RANGE
Engine coolant temperature | Engine coolant temperature sensor value changes in accordance with actual engine coolant temperature |
CONFIRMATION DRIVING PATTERN
- Connect the Techstream to the DLC3.
- Turn the ignition switch to ON and turn the Techstream on.
- Enter the following menus: Powertrain / Engine and ECT / Data List / Coolant Temp.
- Check that the coolant temperature is 60°C (140°F) or less.
- Clear the DTCs (even if no DTCs are stored, perform the clear DTC operation).
- Turn the ignition switch off and wait for at least 30 seconds.
- Turn the ignition switch to ON and turn the Techstream on [A].
- Start the engine and idle it for 5 minutes or more [B].
- HINT:
- If the engine coolant temperature does not change by 5°C (9°F) or more, the engine coolant temperature sensor is malfunctioning. It is not necessary to continue this procedure.
- Enter the following menus: Powertrain / Engine and ECT / Trouble Codes [C].
- Read the pending DTCs.
- HINT:
- If a pending DTC is output, the system is malfunctioning.
- If a pending DTC is not output, perform the following procedure.
- Enter the following menus: Powertrain / Engine and ECT / Utility / All Readiness.
- Input the DTC: P0116.
- Check the DTC judgment result.
Techstream Display Description NORMAL - DTC judgment completed
- System normal
ABNORMAL - DTC judgment completed
- System abnormal
INCOMPLETE - DTC judgment not completed
- Perform driving pattern after confirming DTC enabling conditions
N/A - Unable to perform DTC judgment
- Number of DTCs which do not fulfill DTC preconditions has reached ECU memory limit
- CAUTION:
- When performing the confirmation driving pattern, obey all speed limits and traffic laws.
- HINT:
- If the judgment result shows INCOMPLETE or N/A, perform steps [D] and [E].
- DTC judgment completed
- Drive the vehicle at 40 km/h (25 mph) or more for a total of 5 minutes or more [D].
- HINT:
- In the event of the driving pattern being interrupted (possibly due to factors such as traffic conditions), the driving pattern can be resumed.
- Check the DTC judgment result again [E].
- HINT:
- If the judgment result shows INCOMPLETE or N/A, perform steps [D] and [E] again.
- If no pending DTC is output, perform a universal trip and check for permanent DTCs (Click here).
- HINT:
- If a permanent DTC is output, the system is malfunctioning.
- If no permanent DTC is output, the system is normal.
INSPECTION PROCEDURE
- HINT:
- If DTC P0115, P0117, P0118 or P0125 is stored simultaneously with DTC P0116, the engine coolant temperature sensor may have an open or short circuit. Troubleshoot those DTCs first.
- Read freeze frame data using the Techstream. Freeze frame data records the engine condition when malfunctions are detected. When troubleshooting, freeze frame data can help determine if the vehicle was moving or stationary, if the engine was warmed up or not, if the air-fuel ratio was lean or rich, and other data from the time the malfunction occurred.
- When the DTC is output, check the engine coolant temperature using the Techstream. Enter the following menus: Powertrain / Engine and ECT / Data List / Coolant Temp. If the Coolant Temp value is lower than the actual engine coolant temperature, the engine coolant temperature sensor circuit may be malfunctioning. In this case, check the wire harnesses and connectors (and those connections) between the ECM and the engine coolant temperature sensor first.
1.CHECK FOR ANY OTHER DTCS OUTPUT (IN ADDITION TO DTC P0116) |
Connect the Techstream to the DLC3.
Turn the ignition switch to ON.
Turn the Techstream on.
Enter the following menus: Powertrain / Engine and ECT / Trouble Codes.
Read the DTCs.
Result | Proceed to |
P0116 is output | A |
P0116 and other DTCs are output | B |
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A | |
2.INSPECT WATER INLET WITH THERMOSTAT |
Remove the water inlet with thermostat (Click here).
Measure the valve opening temperature of the thermostat.
- Standard value:
- 80°C to 84°C (176°F to 183°F)
- HINT:
- In addition to the above check, confirm that the valve is completely closed when the temperature is below the standard.
- Perform "Inspection After Repair" after replacing the engine coolant temperature sensor (Click here).
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