SFI SYSTEM, Diagnostic DTC: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 is built into the engine coolant temperature sensor, of which the resistance value varies according to the engine coolant temperature.

The structure of the sensor and its connection to the ECM are the same as those of the intake air temperature sensor.

Tech Tips

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 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

P0117 Step 4 Short in 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

P0118 Step 2 Open in 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

Tech Tips

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

A017CV5E54

INSPECTION PROCEDURE

Tech Tips


  • 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 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


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


    1. Connect the intelligent tester to the DLC3.

    2. Turn the ignition switch on (IG).

    3. Turn the tester on.

    4. Select the following menu items: Powertrain / Engine and ECT / Data list / Coolant Temp.

    5. Read the value displayed on the tester.

      Standard
      Between 80°C and 97°C (176°F and 207°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 97°C (176°F and 207°F) C

      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) or higher.


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


    1. A017BL7E07

      Confirm the connection at the engine coolant temperature sensor.

    2. Disconnect the engine coolant temperature sensor connector.

    3. Connect terminals 1 and 2 of the engine coolant temperature sensor connector on the wire harness side.

    4. Connect the intelligent tester to the DLC3.

    5. Turn the ignition switch on (IG).

    6. Turn the tester on.

    7. Select the following menu items: Powertrain / Engine and ECT / Data list / Coolant Temp.

    8. Read the value displayed on the tester.

      Standard
      140°C (284°F) or higher
    9. Reconnect the engine coolant temperature sensor connector.


    NG
    OK
  3. READ VALUE USING INTELLIGENT TESTER (CHECK FOR OPEN IN ECM)


    1. A017FBKE19

      Confirm the connection at the ECM.

    2. Disconnect the engine coolant temperature sensor connector.

    3. Connect terminals THW and E2 of the ECM connector.

      Tech Tips

      Before checking, do visual and contact pressure checks on the ECM connector.

    4. Connect the intelligent tester to the DLC3.

    5. Turn the ignition switch on (IG).

    6. Turn the tester on.

    7. Select the following menu items: Powertrain / Engine and ECT / Data list / Coolant Temp.

    8. Read the value displayed on the tester.

      Standard
      140°C (284°F) or higher
    9. Reconnect the engine coolant temperature sensor connector.


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


    1. A017EQDE06

      Disconnect the engine coolant temperature sensor connector.

    2. Connect the intelligent tester to the DLC3.

    3. Turn the ignition switch on (IG).

    4. Turn the tester on.

    5. Select the following menu items: Powertrain / Engine and ECT / Data list / Coolant Temp.

    6. Read the value displayed on the tester.

      Standard
      -40°C (-40°F)
    7. Reconnect the engine coolant temperature sensor connector.


    NG
    OK
  5. READ VALUE USING INTELLIGENT TESTER (CHECK FOR SHORT IN ECM)


    1. A017DR2E18

      Disconnect the ECM connector.

    2. Connect the intelligent tester to the DLC3.

    3. Turn the ignition switch on (IG).

    4. Turn the tester on.

    5. Select the following menu items: Powertrain / Engine and ECT / Data list / Coolant Temp.

    6. Read the value displayed on the tester.

      Standard
      -40°C (-40°F)
    7. Reconnect the ECM connector.


    NG
    OK