DTC Code | DTC Name |
---|---|
P0115 | Engine Coolant Temperature Circuit Malfunction |
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 similar to those of the intake air temperature sensor.
Tech Tips
When any of DTCs P0115, P0117 or P0118 are set, 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. | Proceed to | DTC Detection Condition | Trouble Area |
---|---|---|---|
P0115 | Step 1 | Open or short in engine coolant temperature sensor circuit for 0.5 seconds (1 trip detection logic) |
|
P0117 | Step 4 | Short in engine coolant temperature sensor circuit for 0.5 seconds (1 trip detection logic) |
|
P0118 | Step 2 | Open in engine coolant temperature sensor circuit for 0.5 seconds (1 trip detection logic) |
|
Tech Tips
When any of these DTCs are set, check the engine coolant temperature by selecting the following menu items on the intelligent tester: Powertrain / Engine / Data List / Coolant Temp.
Temperature Displayed | Malfunction |
---|---|
-40°C (-40°F) | Open circuit |
140°C (284°F) | Short circuit |
WIRING DIAGRAM
INSPECTION PROCEDURE
Tech Tips
Read freeze frame data using the intelligent tester. The ECM records vehicle and driving condition information as freeze frame data the moment a DTC is stored. When troubleshooting, freeze frame data can be helpful in determining whether the vehicle was running or stopped, whether the engine was warmed up or not, whether the air fuel ratio was lean or rich, as well as other data recorded at the time of a malfunction.
PROCEDURE
READ VALUE USING INTELLIGENT TESTER (COOLANT TEMP)
Connect the intelligent tester to the DLC3.
Turn the engine switch on (IG).
Turn the tester on.
Enter the following menus: Powertrain / Engine / Data List / Coolant Temp.
Read the value displayed on the tester.
Standard |
---|
Same as actual engine coolant temperature. |
Result | ||||||||
---|---|---|---|---|---|---|---|---|
|
Tech Tips
If there is an open circuit, the intelligent tester indicates -40°C (-40°F).
If there is a short circuit, the intelligent tester indicates 140°C (284°F).
B |
READ VALUE USING INTELLIGENT TESTER (CHECK FOR SHORT IN WIRE HARNESS) Click here |
C |
CHECK FOR INTERMITTENT PROBLEMS Click here |
A |
READ VALUE USING INTELLIGENT TESTER (CHECK FOR OPEN IN WIRE HARNESS)
Confirm good connection at the engine coolant temperature sensor connector.
Disconnect the engine coolant temperature sensor connector.
Connect terminals 1 and 2 of the engine coolant temperature sensor connector on the wire harness side.
Connect the intelligent tester to the DLC3.
Turn the engine switch on (IG).
Turn the tester on.
Enter the following menus: Powertrain / Engine / Data List / Coolant Temp.
Read the value displayed on the tester.
Standard |
---|
140°C (284°F) |
Reconnect the engine coolant temperature sensor connector.
NG |
CHECK HARNESS AND CONNECTOR (ENGINE COOLANT TEMPERATURE SENSOR - ECM) Click here |
OK |
REPLACE ENGINE COOLANT TEMPERATURE SENSOR Click here
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 | |||||||||
---|---|---|---|---|---|---|---|---|---|
|
Reconnect the engine coolant temperature sensor connector.
Reconnect the ECM connector.
NG |
REPAIR OR REPLACE HARNESS OR CONNECTOR (ENGINE COOLANT TEMPERATURE SENSOR - ECM) |
OK |
REPLACE ECM Click here
READ VALUE USING INTELLIGENT TESTER (CHECK FOR SHORT IN WIRE HARNESS)
Disconnect the engine coolant temperature sensor connector.
Connect the intelligent tester to the DLC3.
Turn the engine switch on (IG).
Turn the tester on.
Enter the following menus: Powertrain / Engine / Data List / Coolant Temp.
Read the value displayed on the tester.
Standard |
---|
-40°C (-40°F) |
Reconnect the engine coolant temperature sensor connector.
NG |
CHECK HARNESS AND CONNECTOR (ENGINE COOLANT TEMPERATURE SENSOR - ECM) Click here |
OK |
REPLACE ENGINE COOLANT TEMPERATURE SENSOR Click here
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 | ||||||
---|---|---|---|---|---|---|
|
Reconnect the engine coolant temperature sensor connector.
Reconnect the ECM connector.
NG |
REPAIR OR REPLACE HARNESS OR CONNECTOR (ENGINE COOLANT TEMPERATURE SENSOR - ECM) |
OK |
REPLACE ECM Click here