SFI SYSTEM, Diagnostic DTC:P0115, P0117, P0118
| 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. | DTC Detection Condition | Trouble Area |
|---|---|---|
| P0115 | Open or short in engine coolant temperature sensor circuit for 0.5 seconds (1 trip detection logic) |
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| P0117 | Short in engine coolant temperature sensor circuit for 0.5 seconds (1 trip detection logic) |
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| P0118 | 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 entering the following menus on the GTS: Powertrain / Engine and ECT / Data List / Coolant Temp.
| Tester Displayed | Malfunction |
|---|---|
| -40°C (-40°F) | Open circuit |
| Higher than 135°C (275°F) | Short circuit |
MONITOR DESCRIPTION
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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 becomes low, the resistance in the thermistor increases. When the temperature becomes 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. When the sensor output voltage deviates from the normal operating range, the ECM interprets this as a malfunction in the engine coolant temperature sensor and sets a DTC.
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Example:
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If the sensor output voltage is more than 4.91 V for 0.5 seconds or more, the ECM determines that there is an open in the engine coolant temperature sensor circuit, and sets DTC P0118. Conversely, if the voltage output is less than 0.14 V for 0.5 seconds or more, the ECM determines that there is a short in the sensor circuit, and sets DTC P0117.
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If the malfunction is not repaired successfully, a DTC is set 0.5 seconds after the engine is next started.
MONITOR STRATEGY
| Frequency of Operation | Continuous |
CONFIRMATION DRIVING PATTERN
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Connect the GTS to the DLC3.
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Turn the engine switch on (IG) and turn the GTS on.
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Clear the DTCs (even if no DTCs are stored, perform the clear DTC procedure) Click here.
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Turn the engine switch off and wait for at least 30 seconds.
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Turn the engine switch on (IG) and turn the GTS on.
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Wait 0.5 seconds or more.
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Enter the following menus: Powertrain / Engine and ECT / Trouble Codes.
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Read Pending DTCs.
Tech Tips
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If a pending DTC is output, the system is malfunctioning.
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If a pending DTC is not output, perform the following procedure.
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Enter the following menus: Powertrain / Engine and ECT / Utility / All Readiness.
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Input the DTC: P0115, P0117 or P0118.
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Check the DTC judgment result.
Tester Display Description NORMAL
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DTC judgment completed
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System normal
ABNORMAL
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DTC judgment completed
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System abnormal
INCOMPLETE
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DTC judgment not completed
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Perform driving pattern after confirming DTC enabling conditions
N/A
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Unable to perform DTC judgment
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Number of DTCs which do not fulfill DTC preconditions has reached ECU's memory limit
Tech Tips
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If the judgment result shows NORMAL, the system is normal.
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If the judgment result shows ABNORMAL, the system has a malfunction.
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WIRING DIAGRAM
INSPECTION PROCEDURE
Tech Tips
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If other DTCs relating to different systems that have terminal E2 as the ground terminal are output simultaneously, terminal E2 may have an open circuit.
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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.
PROCEDURE
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READ VALUE USING GTS (COOLANT TEMP)
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Connect the GTS to the DLC3.
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Turn the engine switch on (IG).
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Turn the GTS on.
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Enter the following menus: Powertrain / Engine and ECT / Data List / Coolant Temp.
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Read the value displayed on the GTS.
Standard Between 75 and 100°C (167 and 212°F) with warm engine. Result Result Proceed to Displayed temperature is -40°C (-40°F) A Displayed temperature is higher than 135°C (275°F) B Between 75 and 100°C (167 and 212°F) with warm engine. C Tech Tips
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If there is an open circuit, the GTS indicates -40°C (-40°F).
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If there is a short circuit, the GTS indicates higher than 135°C (275°F).
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B 
READ VALUE USING GTS (CHECK FOR SHORT IN WIRE HARNESS) Click here
C 
CHECK FOR INTERMITTENT PROBLEMS Click here
A 
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READ VALUE USING GTS (CHECK FOR OPEN IN WIRE HARNESS)
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Confirm good connection at the engine coolant temperature sensor connector.
Text in Illustration *1 Engine Coolant Temperature Sensor *2 ECM *a Front view of wire harness connector
(to Engine Coolant Temperature Sensor)
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Disconnect the engine coolant temperature sensor connector.
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Connect terminals 1 and 2 of the engine coolant temperature sensor connector on the wire harness side.
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Connect the GTS to the DLC3.
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Turn the engine switch on (IG).
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Turn the GTS on.
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Enter the following menus: Powertrain / Engine and ECT / Data List / Coolant Temp.
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Read the value displayed on the GTS.
Standard Higher than 135°C (275°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
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CHECK HARNESS AND CONNECTOR (ENGINE COOLANT TEMPERATURE SENSOR - ECM)
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Disconnect the engine coolant temperature sensor connector.
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Disconnect the ECM connectors.
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Measure the resistance according to the value(s) in the table below.
Standard Resistance Tester Connection Condition Specified Condition F59-2- F1-19 (THW) Always Below 1 Ω F59-1 - F1-28 (E2) Always Below 1 Ω -
Reconnect the engine coolant temperature sensor connector.
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Reconnect the ECM connectors.
NG
REPAIR OR REPLACE HARNESS OR CONNECTOR
OK
REPLACE ECM Click here
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READ VALUE USING GTS (CHECK FOR SHORT IN WIRE HARNESS)
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Text in Illustration *1 Engine Coolant Temperature Sensor *2 ECM Disconnect the engine coolant temperature sensor connector.
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Connect the GTS to the DLC3.
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Turn the engine switch on (IG).
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Turn the GTS on.
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Enter the following menus: Powertrain / Engine and ECT / Data List / Coolant Temp.
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Read the value displayed on the GTS.
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
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CHECK HARNESS AND CONNECTOR (ENGINE COOLANT TEMPERATURE SENSOR - ECM)
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Disconnect the engine coolant temperature sensor connector.
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Disconnect the ECM connector.
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Measure the resistance according to the value(s) in the table below.
Standard Resistance Tester Connection Condition Specified Condition F59-2 or F1-19 (THW) - Body ground Always 10 kΩ or higher -
Reconnect the engine coolant temperature sensor connector.
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Reconnect the ECM connector.
NG
REPAIR OR REPLACE HARNESS OR CONNECTOR
OK
REPLACE ECM Click here
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