SFI SYSTEM(w/o EGR System), Diagnostic DTC:P0116
| DTC Code | DTC Name |
|---|---|
| P0116 | Engine Coolant Temperature Circuit Range / Performance Problem |
DESCRIPTION
Refer to DTC P0115 (Click here).
DTC No. |
Detection Item |
DTC Detection Condition |
Trouble Area |
Warning Indicate |
Memory |
|---|---|---|---|---|---|
P0116 |
Engine Coolant Temperature Circuit Range / Performance Problem |
Engine coolant temperature is between 35°C and 60°C (95°F and 140°F) when the engine is started and conditions (a) and (b) are met (2 trip detection logic): (a) Vehicle is driven at varying speeds (accelerated and decelerated). (b) Engine coolant temperature remains within 3°C (5.4°F) of the initial engine coolant temperature. |
|
Comes on |
DTC stored |
MONITOR DESCRIPTION
The engine coolant temperature sensor is used to monitor the engine coolant temperature. The engine coolant temperature sensor has a built-in thermistor with a resistance that varies according to the temperature of the engine coolant. When the engine coolant temperature is low, the resistance of the thermistor increases. When the temperature is high, the resistance drops. These variations in the resistance are reflected in the output voltage from the engine coolant temperature sensor.
Engine coolant temperature sensor high side stuck monitor
The ECM monitors the sensor voltage and uses this value to calculate the engine coolant temperature. If the sensor voltage output deviates from the normal operating range, the ECM interprets this deviation as a malfunction in the engine coolant temperature sensor and stores the DTC.
Example:
Upon starting the engine, the engine coolant temperature is between 35°C and 60°C (95°F and 140°F). If, after driving for 250 seconds, the engine coolant temperature remains within 3°C (5.4°F) of the starting temperature, the DTC is stored (2 trip detection logic).
CONFIRMATION DRIVING PATTERN
Connect the intelligent tester to the DLC3.
Turn the engine switch on (IG) and turn the tester 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 DTCs (even if no DTCs are stored, perform the clear DTC operation).
Turn the engine switch off and wait for at least 30 seconds.
Turn the engine switch on (IG) and turn the tester on [A].
Start the engine and idle it for 5 minutes or more [B].
Tip: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 / DTC [C].
Read the pending DTCs.
Tip: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.
Tester 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
Tip:If the judgment result shows NORMAL, the system is normal.
If the judgment result shows ABNORMAL, the system has a malfunction.
If the judgment result shows INCOMPLETE or N/A, perform steps [D] and [E].
Drive the vehicle at 40 km/h (25 mph) or more for a total of 5 minutes or more [D].
CAUTION:When performing the confirmation driving pattern, obey all speed limits and traffic laws.
Tip: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].
Tip:If the judgment result shows NORMAL, the system is normal.
If the judgment result shows ABNORMAL, the system has a malfunction.
If the judgment result shows INCOMPLETE or N/A, perform steps [D] and [E] again.
CAUTION / NOTICE / HINT
If DTC P0115, P0117 or P0118 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 intelligent tester. 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.
PROCEDURE
CHECK FOR ANY OTHER DTCS OUTPUT (IN ADDITION TO DTC P0116)
Connect the intelligent tester to the DLC3.
Turn the engine switch on (IG).
Turn the tester on.
Enter the following menus: Powertrain / Engine and ECT / DTC.
Read the DTCs.
Powertrain > Engine and ECT > Trouble Codes
Result
Result
Proceed to
P0116 is output
A
P0116 and other DTCs are output
B
Tip:If any DTCs other than P0116 are output, perform troubleshooting for those DTCs first.
INSPECT THERMOSTAT
Remove the thermostat.
Measure the valve opening temperature of the thermostat.
Standard opening temperature
80 to 84°C (176 to 183°F)
Tip:In addition to the above check, confirm that the valve is completely closed when the temperature is below the standard.
Reinstall the thermostat.
Result
Result
OK
NG