DTC Code | DTC Name |
---|---|
P0115 | Engine Coolant Temperature Circuit |
P0117 | Engine Coolant Temperature Circuit Low Input |
P0118 | Engine Coolant Temperature Circuit High Input |
DESCRIPTION
A thermistor, whose resistance value varies according to the engine coolant temperature, is built into the engine coolant temperature sensor. The structure of the sensor and its connection to the ECM are the same as those of the intake air temperature sensor.
Tech Tips
When DTC P0115, P0117 or P0118 is stored, the ECM enters fail-safe mode. During fail-safe mode, the engine coolant temperature is estimated to be 80°C (176°F) by the ECM. Fail-safe mode continues until a pass condition is detected.
DTC No. | Detection Item | DTC Detection Condition | Trouble Area | MIL | Memory |
---|---|---|---|---|---|
P0115 | Engine Coolant Temperature Circuit | An open or short in the engine coolant temperature sensor circuit for 0.5 seconds (1 trip detection logic). |
|
Comes on | DTC stored |
P0117 | Engine Coolant Temperature Circuit Low Input | A short in the engine coolant temperature sensor circuit for 0.5 seconds (1 trip detection logic). |
|
Comes on | DTC stored |
P0118 | Engine Coolant Temperature Circuit High Input | An open in the engine coolant temperature sensor circuit for 0.5 seconds (1 trip detection logic). |
|
Comes on | DTC stored |
Tech Tips
When any of these DTCs are output, check the engine coolant temperature using the GTS. Enter the following menus: Powertrain / Engine and ECT / Data List / Coolant Temp.
Temperature Displayed | Malfunction |
---|---|
-40°C (-40°F) | Open circuit |
140°C (284°F) | Short circuit |
MONITOR DESCRIPTION
The engine coolant temperature sensor is used to monitor the engine coolant temperature. The engine coolant temperature sensor has a thermistor with a resistance that varies according to the temperature of the engine coolant. When the coolant temperature is low, the resistance in the thermistor increases. When the temperature is high, the resistance drops. These variations in resistance are reflected in the output voltage from the sensor. The ECM monitors the sensor voltage and uses this value to calculate the engine coolant temperature. If the sensor output voltage deviates from the normal operating range, the ECM interprets this as a fault in the engine coolant temperature sensor circuit and stores a DTC.
MONITOR STRATEGY
Frequency of Operation | Continuous |
CONFIRMATION DRIVING PATTERN
Connect the GTS to the DLC3.
Turn the power switch on (IG) and turn the GTS on.
Clear the DTCs (even if no DTCs are stored, perform the clear DTC procedure).
Turn the power switch off and wait for at least 30 seconds.
Turn the power switch on (IG) and turn the GTS on.
Wait 0.5 seconds or more.
Enter the following menus: Powertrain / Engine and ECT / Trouble Codes.
Read the pending DTCs.
Tech Tips
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: P0115, P0117 or P0118.
Check the DTC judgment result.
GTS Display | Description |
---|---|
NORMAL |
|
ABNORMAL |
|
INCOMPLETE |
|
N/A |
|
Tech Tips
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 the Confirmation Driving Pattern and check the DTC judgment result again.
WIRING DIAGRAM
*a | Engine Coolant Temperature Sensor |
CAUTION / NOTICE / HINT
Tech Tips
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.
If DTC P0117 is stored, check that the engine does not overheat (the DTC P0117 may be stored due to engine overheating).
PROCEDURE
READ VALUE USING GTS (COOLANT TEMP)
Connect the GTS to the DLC3.
Turn the power switch on (IG).
Turn the GTS on.
Enter the following menus: Powertrain / Engine and ECT / Data List / Coolant Temp.
Tester Display |
---|
Coolant Temp |
Read the value displayed on the GTS.
Standard Value |
---|
Between 75 and 100°C (167 and 212°F) with warm engine. |
Result | ||||||||
---|---|---|---|---|---|---|---|---|
|
Tech Tips
If there is an open circuit, the GTS indicates -40°C (-40°F).
If there is a short circuit, the GTS indicates 140°C (284°F).
B |
READ VALUE USING GTS (CHECK FOR SHORT IN WIRE HARNESS) Click here |
C |
CHECK FOR INTERMITTENT PROBLEMS Click here |
A |
READ VALUE USING GTS (CHECK FOR OPEN IN WIRE HARNESS)
Disconnect the engine coolant temperature sensor connector.
*1 | Engine Coolant Temperature Sensor | *2 | ECM |
*a | Front view of wire harness connector (to Engine Coolant Temperature Sensor) |
- | - |
Connect terminals 1 and 2 of the engine coolant temperature sensor connector on the wire harness side.
Connect the GTS to the DLC3.
Turn the power switch on (IG).
Turn the GTS on.
Enter the following menus: Powertrain / Engine and ECT / Data List / Coolant Temp.
Tester Display |
---|
Coolant Temp |
Read the value displayed on the GTS.
Standard Value |
---|
140°C (284°F) |
Tech Tips
Perform "Inspection After Repair" after replacing the engine coolant temperature sensor.
Result | |||
---|---|---|---|
|
OK |
REPLACE ENGINE COOLANT TEMPERATURE SENSOR Click here |
NG |
CHECK HARNESS AND CONNECTOR (ENGINE COOLANT TEMPERATURE SENSOR - ECM)
Disconnect the engine coolant temperature sensor connector.
Disconnect the ECM connector.
Measure the resistance according to the value(s) in the table below.
Standard Resistance | |||||||||
---|---|---|---|---|---|---|---|---|---|
|
Result | |||
---|---|---|---|
|
OK |
REPLACE ECM Click here |
NG |
REPAIR OR REPLACE HARNESS OR CONNECTOR |
READ VALUE USING GTS (CHECK FOR SHORT IN WIRE HARNESS)
*1 | Engine Coolant Temperature Sensor |
*2 | ECM |
Disconnect the engine coolant temperature sensor connector.
Connect the GTS to the DLC3.
Turn the power switch on (IG).
Turn the GTS on.
Enter the following menus: Powertrain / Engine and ECT / Data List / Coolant Temp.
Tester Display |
---|
Coolant Temp |
Read the value displayed on the GTS.
Standard Value |
---|
-40°C (-40°F) |
Tech Tips
Perform "Inspection After Repair" after replacing the engine coolant temperature sensor.
Result | |||
---|---|---|---|
|
OK |
REPLACE ENGINE COOLANT TEMPERATURE SENSOR Click here |
NG |
CHECK HARNESS AND CONNECTOR (ENGINE COOLANT TEMPERATURE SENSOR - ECM)
Disconnect the engine coolant temperature sensor connector.
Disconnect the ECM connector.
Measure the resistance according to the value(s) in the table below.
Standard Resistance | ||||||
---|---|---|---|---|---|---|
|
Result | |||
---|---|---|---|
|
OK |
REPLACE ECM Click here |
NG |
REPAIR OR REPLACE HARNESS OR CONNECTOR |