DTC P0115 P0117 P0118 2AD-FHV

DTC    P0115    Engine Coolant Temperature Circuit

DTC    P0117    Engine Coolant Temperature Circuit Low Input

DTC    P0118    Engine Coolant Temperature Circuit High Input

 

Description

A thermistor is built into the Engine Coolant Temperature (ECT) sensor and it changes its resistance value according to the engine coolant temperature.
The structure of the sensor and connection to the ECM is the same as the intake air temperature sensor.

 

HINT:

If the ECM detects the DTC P0115, P0117, or P0118, it operates the fail-safe function in which the ECT is assumed to be 80°C (176°F).

Toyota fault code list DTC P0115 DTC P0117 DTC P0118

DTC No. DTC Detection Condition Trouble Area
P0115 Open or short in ECT sensor circuit for 0.5 seconds
(1 trip detection logic)
  1. Open or short in ECT sensor circuit
  2. ECT sensor
  3. ECM
P0117 Short in ECT sensor circuit for 0.5 seconds
(sensor resistance value less than 79 ?)
(1 trip detection logic)
  1. Open or short in ECT sensor circuit
  2. ECT sensor
  3. ECM
P0118 Open in ECT sensor circuit for 0.5 seconds
(sensor resistance value more than 156 k?)
(1 trip detection logic)
  1. Open or short in ECT sensor circuit
  2. ECT sensor
  3. ECM

HINT:

When DTC P0115, P0117, and/or P0118 is detected, check the engine coolant temperature by entering the following menus on the intelligent tester: Powertrain / Engine and ECT / Data List / Coolant Temp.

 

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

Wiring diagram


Wiring diagram

Inspection procedure

 

NOTICE:

After replacing the ECM, the new ECM needs registration and initialization.

HINT:

If DTCs relating to different systems are output, and they share terminal E2 as their ground, check this ground circuit first.

1.READ VALUE USING INTELLIGENT TESTER (ENGINE COOLANT TEMPERATURE)

  1. Connect the intelligent tester to the DLC3.

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

  3. Enter the following menus: Powertrain / Engine and ECT / Data List / Coolant Temp.

  4. Read the value.

     

    Standard value:

    Between 75 and 95°C (167 and 203°F) with warm engine.

    Result:
    Temperature Displayed Proceed to
    -40°C (-40°F) A
    140°C (284°F) or more B
    Between 75 and 95°C (167 and 203°F) C

    HINT:

    1. If there is an open circuit, the tester indicates -40°C (-40°F).
    2. If there is a short circuit, the tester indicates 140°C (284°F) or more.

 

  B  
Go to step 4
 
  C  
CHECK FOR INTERMITTENT PROBLEMS
 
A  
   
2.READ VALUE USING INTELLIGENT TESTER (CHECK FOR OPEN IN WIRE HARNESS)
Disconnect the B4 ECT sensor connector.

  1. Disconnect the B4 ECT sensor connector.

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

  3. Connect the intelligent tester to the DLC3.

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

  5. Enter the following menus: Powertrain / Engine and ECT / Data List / Coolant Temp.

  6. Read the value.

     

    Standard value:

    140°C (284°F) or higher.

  7. Reconnect the ECT sensor connector.

 

  OK  
CONFIRM GOOD CONNECTION TO SENSOR. IF OK, REPLACE ENGINE COOLANT TEMPERATURE SENSOR
 
NG  
   
3.CHECK WIRE HARNESS (ENGINE COOLANT TEMPERATURE SENSOR - ECM)
Disconnect the B4 ECT sensor connector.

  1. Disconnect the B4 ECT sensor connector.

  2. Disconnect the B32 ECM connector.

  3. Measure the resistance of the wire harness side connectors.

     

    Standard resistance:

    Tester Connection Specified Condition
    B4-2 - B32-111 (THW) Below 1 ?
    B4-1 - B32-88 (ETHW) Below 1 ?

  4. Reconnect the ECT sensor connector.

  5. Reconnect the ECM connector.

 

  OK  
REPAIR OR REPLACE HARNESS AND CONNECTOR
 
NG  
   
CONFIRM GOOD CONNECTION TO ECM. IF OK, REPLACE ECM 
4.READ VALUE USING INTELLIGENT TESTER (CHECK FOR SHORT IN WIRE HARNESS)
Disconnect the B4 ECT sensor connector.

  1. Disconnect the B4 ECT sensor connector.

  2. Connect the intelligent tester to the DLC3.

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

  4. Enter the following menus: Powertrain / Engine and ECT / Data List / Coolant Temp.

  5. Read the value.

     

    Standard value:

    -40°C (-40°F) or more.

  6. Reconnect the ECT sensor connector.

 

  OK  
REPLACE ENGINE COOLANT TEMPERATURE SENSOR
 
NG  
   
5.CHECK WIRE HARNESS (ENGINE COOLANT TEMPERATURE SENSOR - ECM)
CHECK WIRE HARNESS

  1. Disconnect the B4 ECT sensor connector.

  2. Disconnect the B32 ECM connector.

  3. Measure the resistance of the wire harness side connectors.

     

    Standard resistance:

    Tester Connection Specified Condition
    B4-2 or B32-111 (THW) - Body ground 10 k? or higher

  4. Reconnect the ECT sensor connector.

  5. Reconnect the ECM connector.

 

  OK  
REPAIR OR REPLACE HARNESS AND CONNECTOR
 
NG  
   
REPLACE ECM 
2AD-FHV