SFI SYSTEM(w/o Canister Pump Module), Diagnostic DTC:P0116
| DTC Code | DTC Name |
|---|---|
| P0116 | Engine Coolant Temperature Circuit Range / Performance Problem |
DESCRIPTION
Refer to DTC P0115.
DTC No. |
Detection Item |
DTC Detection Condition |
Trouble Area |
MIL |
Memory |
|---|---|---|---|---|---|
P0116 |
Engine Coolant Temperature Circuit Range / Performance Problem |
Engine coolant temperature between -40°C and 60°C (-40°F and 140°F) when engine started, and conditions (a) and (b) met (2 trip detection logic)
|
|
Comes on |
DTC stored |
MONITOR DESCRIPTION
The engine coolant temperature sensor is used to monitor the engine coolant temperature. The enginecoolant temperature sensor has a built-in thermistor with a resistance that varies according to thetemperature of the engine coolant. When the engine coolant temperature is low, the resistance of thethermistor 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.
Examples:
When starting the engine and the engine coolant temperature is between -40 and 60°C (-40 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).
MONITOR STRATEGY
Required Sensors/Components |
Engine coolant temperature sensor |
Frequency of Operation |
Once per driving cycle |
CONFIRMATION DRIVING PATTERN
Connect the GTS to the DLC3.
Turn the ignition switch to ON and turn the GTS on.
Enter the following menus: Powertrain / Engine and ECT / Data List / Primary / Coolant Temp.
Check that the engine coolant temperature is 60°C (140°F) or less.
Clear the DTCs (even if no DTCs are stored, perform the clear DTC procedure).
Turn the ignition switch off and wait for 30 seconds.
Turn the ignition switch to ON and turn the GTS 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 higher, 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.
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.
GTS 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 drive pattern being interrupted (possibly due to factors such as traffic conditions), the drive 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].
CAUTION / NOTICE / HINT
If any of DTCs P0115, P0117 or P0118 are output simultaneously with DTC P0116, the engine coolant temperature sensor may have an open or a short circuit. Troubleshoot those DTCs first.
Read freeze frame data using the GTS. The ECM records vehicle and driving condition information as freeze frame data the moment a DTC is stored. 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 GTS. Enter the following menus: Powertrain / Engine and ECT / Data List / Primary / 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.
PROCEDURE
CHECK ANY OTHER DTCS OUTPUT (IN ADDITION TO DTC P0116)
Connect the GTS to the DLC3.
Turn the ignition switch to ON.
Turn the GTS on.
Enter the following menus: Powertrain / Engine and ECT / Trouble Codes.
Read the DTCs.
Powertrain > Engine and ECT > Trouble Codes
Result
Result
Proceed to
DTC P0116 is output
A
DTC P0116 and other DTCs are output
B
Tip:If any DTCs other than P0116 are output, troubleshoot those DTCs first.
INSPECT THERMOSTAT
Inspect the thermostat (opening temperature).
Tip:Perform "Inspection After Repair" after replacing the engine coolant temperature sensor.
Result
Proceed to
OK
NG