Dtc P0115 Engine Coolant Temperature Circuit Malfunction

Engine. Toyota Rav4. Aca30, 33, 38 Gsa33 Zsa30, 35
1Az-Fe Engine Control System. Toyota Rav4. Aca30, 33, 38 Gsa33 Zsa30, 35

DESCRIPTION

WIRING DIAGRAM

INSPECTION PROCEDURE

READ VALUE USING INTELLIGENT TESTER (ENGINE COOLANT TEMPERATURE)

READ VALUE USING INTELLIGENT TESTER (CHECK FOR OPEN IN WIRE HARNESS)

CHECK HARNESS AND CONNECTOR (ENGINE COOLANT TEMPERATURE SENSOR - ECM)

READ VALUE USING INTELLIGENT TESTER (CHECK FOR SHORT IN WIRE HARNESS)

CHECK HARNESS AND CONNECTOR (ENGINE COOLANT TEMPERATURE SENSOR - ECM)

DTC P0115 Engine Coolant Temperature Circuit Malfunction

DTC P0117 Engine Coolant Temperature Circuit Low Input

DTC P0118 Engine Coolant Temperature Circuit High Input


DESCRIPTION

A thermistor, whose resistance value varies according to the ECT, is built into the Engine Coolant Temperature (ECT) sensor.
The structure of the sensor and its connection to the ECM are the same as those of the Intake Air Temperature (IAT) sensor.
HINT:
When any of DTCs P0115, P0117 and P0118 are set, the ECM enters fail-safe mode. During fail-safe mode, the ECT 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 ECT sensor circuit for 0.5 seconds (1 trip detection logic)
  1. Open or short in ECT sensor circuit
  1. ECT sensor
  1. ECM
P0117
Step 4
Short in ECT sensor circuit for 0.5 seconds (1 trip detection logic)
  1. Short in ECT sensor circuit
  1. ECT sensor
  1. ECM
P0118
Step 2
Open in ECT sensor circuit for 0.5 seconds (1 trip detection logic)
  1. Open in ECT sensor circuit
  1. ECT sensor
  1. ECM
HINT:
When any of these DTCs are set, check the ECT by selecting the following menu items on the intelligent tester: Powertrain / Engine and ECT / Data List / Coolant Temp.

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

WIRING DIAGRAM


Toyota Rav4. Aca30, 33, 38 Gsa33 Zsa30, 35.1Az-Fe Engine Control System.Sfi System. Dtc P0115 Engine Coolant Temperature Circuit Malfunction


INSPECTION PROCEDURE

HINT:
Read freeze frame data using the intelligent tester. Freeze frame data records the engine condition when malfunctions are detected. 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.
1.READ VALUE USING INTELLIGENT TESTER (ENGINE COOLANT TEMPERATURE)

  1. Connect the intelligent tester to the DLC3.

  1. Turn the ignition switch on (IG) and turn the tester ON.

  1. Select the following menu items: Powertrain / Engine and ECT / Data List / Coolant Temp.

  1. Read the value displayed on the tester.

    Standard:
    Between 80°C and 100°C (176°F and 212°F) with warm engine.
    Result:
    Temperature Displayed
    		Proceed to
    -40°C (-40°F)
    		A
    140°C (284°F) or higher
    		B
    Between 80°C and 100°C (176°F and 212°F)
    		C
    HINT:
    1. If there is an open circuit, the intelligent tester indicates -40°C (-40°F).
    1. If there is a short circuit, the intelligent tester indicates 140°C (284°F) or higher.


B
Go to step 4

C
CHECK FOR INTERMITTENT PROBLEMS
A


2.READ VALUE USING INTELLIGENT TESTER (CHECK FOR OPEN IN WIRE HARNESS)


    Toyota Rav4. Aca30, 33, 38 Gsa33 Zsa30, 35.1Az-Fe Engine Control System.Sfi System. Dtc P0115 Engine Coolant Temperature Circuit Malfunction

  1. Disconnect the B4 Engine Coolant Temperature (ECT) sensor connector.

  1. Connect terminals 1 and 2 of the ECT sensor connector on the wire harness side.

  1. Connect the intelligent tester to the DLC3.

  1. Turn the ignition switch on (IG) and turn the tester ON.

  1. Select the following menu items: Powertrain / Engine and ECT / Data List / Coolant Temp.

  1. Read the value displayed on the tester.

    Standard:
    140°C (284°F) or higher.

  1. Reconnect the ECT sensor connector.



OK
CONFIRM GOOD CONNECTION TO SENSOR. IF OK, REPLACE ENGINE COOLANT TEMPERATURE SENSOR
NG


3.CHECK HARNESS AND CONNECTOR (ENGINE COOLANT TEMPERATURE SENSOR - ECM)


    Toyota Rav4. Aca30, 33, 38 Gsa33 Zsa30, 35.1Az-Fe Engine Control System.Sfi System. Dtc P0115 Engine Coolant Temperature Circuit Malfunction

  1. Disconnect the B4 ECT sensor connector.

  1. Disconnect the B32 ECM connector.

  1. Measure the resistance.

    Standard resistance:
    Tester Connection
    		Specified Condition
    THW (B4-2) - THW (B32-97)
    		Below 1 Ω
    E2 (B4-1) - ETHW (B32-96)

  1. Reconnect the ECT sensor connector.

  1. Reconnect the ECM connector.



NG
REPAIR OR REPLACE HARNESS OR CONNECTOR
OK

CONFIRM GOOD CONNECTION TO ECM. IF OK, REPLACE ECM

4.READ VALUE USING INTELLIGENT TESTER (CHECK FOR SHORT IN WIRE HARNESS)


    Toyota Rav4. Aca30, 33, 38 Gsa33 Zsa30, 35.1Az-Fe Engine Control System.Sfi System. Dtc P0115 Engine Coolant Temperature Circuit Malfunction

  1. Disconnect the B4 ECT sensor connector.

  1. Connect the intelligent tester to the DLC3.

  1. Turn the ignition switch on (IG) and turn the tester ON.

  1. Select the following menu items: Powertrain / Engine and ECT / Data List / Coolant Temp.

  1. Read the value displayed on the tester.

    Standard:
    -40°C (-40°F)

  1. Reconnect the ECT sensor connector.



OK
REPLACE ENGINE COOLANT TEMPERATURE SENSOR
NG


5.CHECK HARNESS AND CONNECTOR (ENGINE COOLANT TEMPERATURE SENSOR - ECM)


    Toyota Rav4. Aca30, 33, 38 Gsa33 Zsa30, 35.1Az-Fe Engine Control System.Sfi System. Dtc P0115 Engine Coolant Temperature Circuit Malfunction

  1. Disconnect the B4 ECT sensor connector.

  1. Disconnect the B32 ECM connector.

  1. Measure the resistance.

    Standard resistance:
    Tester Connection
    		Specified Condition
    THW (B4-2) or THW (B32-97) - Body ground
    		10 kΩ or higher

  1. Reconnect the ECT sensor connector.

  1. Reconnect the ECM connector.



NG
REPAIR OR REPLACE HARNESS OR CONNECTOR
OK

REPLACE ECM