P0115, P0117, P0118

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.

Tip:

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).	Open or short in engine coolant temperature sensor circuit Engine coolant temperature sensor ECM	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).	Short in engine coolant temperature sensor circuit Engine coolant temperature sensor ECM	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).	Open in engine coolant temperature sensor circuit Engine coolant temperature sensor ECM	Comes on	DTC stored

Tip:

When any of these DTCs are output, check the engine coolant temperature using the GTS. Enter the following menus on the GTS: Powertrain / Engine / Data List / All Data / Coolant Temp.

Temperature Displayed	Malfunction
-40°C (-40°F)	Open circuit
140°C (284°F)	Short circuit

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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.

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MONITOR STRATEGY

Frequency of Operation

Continuous

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CONFIRMATION DRIVING PATTERN

Connect the GTS to the DLC3.
Turn the engine switch on (IG) and turn the GTS on.
Clear the DTCs (even if no DTCs are stored, perform the clear DTC procedure).
Turn the engine switch off and wait for at least 30 seconds.
Turn the engine switch on (IG) and turn the GTS on.
Wait 0.5 seconds or more.
Enter the following menus: Powertrain / Engine / Trouble Codes.
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 / Utility / All Readiness.
Input the DTC: P0115, P0117 or P0118.

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 the Confirmation Driving Pattern and check the DTC judgment result again.

Table 1. *a Engine Coolant Temperature Sensor

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WIRING DIAGRAM

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CAUTION / NOTICE / HINT

Tip:

If DTC P0117 is stored, check that the engine does not overheat (the DTC P0117 may be stored due to engine overheating).
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.
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.

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PROCEDURE

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READ VALUE USING GTS (COOLANT TEMP)

Connect the GTS to the DLC3.
Turn the engine switch on (IG).
Turn the GTS on.
Enter the following menus: Powertrain / Engine / Data List / All Data / Coolant Temp.
1. Powertrain > Engine > Data List
  
  Tester Display
  
  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

Result	Proceed to
-40°C (-40°F)	A
140°C (284°F)	B
Between 75 and 100°C (167 and 212°F)	C

Tip:

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).

AClick here
BClick here
C
CHECK FOR INTERMITTENT PROBLEMSClick here

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READ VALUE USING GTS (CHECK FOR OPEN IN WIRE HARNESS)

*1

Engine Coolant Temperature Sensor

*2

ECM

*a

Front view of wire harness connector

(to Engine Coolant Temperature Sensor)

-

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 GTS to the DLC3.
Turn the engine switch on (IG).
Turn the GTS on.
Enter the following menus: Powertrain / Engine / Data List / All Data / Coolant Temp.
1. Powertrain > Engine > Data List
  
  Tester Display
  
  Coolant Temp

Tester Display
Coolant Temp

Read the value displayed on the GTS.

Standard Value
140°C (284°F)

Tip:

Perform "Inspection After Repair" after replacing the engine coolant temperature sensor.

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Result

Proceed to
OK
NG

OK
REPLACE ENGINE COOLANT TEMPERATURE SENSORClick here
NGClick here

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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

Tester Connection	Condition	Specified Condition
F13-2 - F4-29 (THW)	Always	Below 1 Ω
F13-1 - F2-24 (E2)	Always	Below 1 Ω

Result

Proceed to
OK
NG

OK
REPLACE ECMClick here
NG
REPAIR OR REPLACE HARNESS OR CONNECTOR

*1 Engine Coolant Temperature Sensor *2 ECM

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READ VALUE USING GTS (CHECK FOR SHORT IN WIRE HARNESS)

Disconnect the engine coolant temperature sensor connector.
Connect the GTS to the DLC3.
Turn the engine switch on (IG).
Turn the GTS on.
Enter the following menus: Powertrain / Engine / Data List / All Data / Coolant Temp.
1. Powertrain > Engine > Data List
  
  Tester Display
  
  Coolant Temp

Tester Display
Coolant Temp

Read the value displayed on the GTS.

Standard Value
-40°C (-40°F)

Tip:

Perform "Inspection After Repair" after replacing the engine coolant temperature sensor.

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Result

Proceed to
OK
NG

OK
REPLACE ENGINE COOLANT TEMPERATURE SENSORClick here
NGClick here

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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

Tester Connection	Condition	Specified Condition
F13-2 or F4-29 (THW) - Body ground	Always	10 kΩ or higher

Result

Proceed to
OK
NG

OK
REPLACE ECMClick here
NG
REPAIR OR REPLACE HARNESS OR CONNECTOR

SFI SYSTEM(w/o Canister Pump Module), Diagnostic DTC:P0115, P0117, P0118