P0113 – EGR Gas Temperature Sensor Circuit High Input Euro5b MMC L200 IV



OPERATION

  • A power voltage of 5 V is applied to the EGR gas temperature sensor output terminal (terminal No. 2) from the engine-ECU (terminal No. 36).
  • The power voltage is earthed to the engine-ECU (terminal No. 30) from the EGR gas temperature sensor (terminal No. 1).

  • FUNCTION

  • The EGR gas temperature sensor converts the EGR gas temperature into a voltage and inputs the voltage signal to the engine-ECU.
  • The EGR gas temperature sensor is a kind of resistor, which has characteristics to reduce its resistance as the EGR gas temperature rises. Therefore, the sensor output voltage varies with the EGR gas temperature, and becomes lower as the EGR gas temperature rises.

  • TROUBLE JUDGMENT

  • Battery positive voltage is 8 – 16 V
  • 2 seconds later after the ignition switch has been in “ON” position or the engine has started up.
  • The EGR gas temperature sensor output voltage is 4.96 V or more (the EGR gas temperature is below -50°C or equivalent).

  • PROBABLE CAUSES

  • Failed EGR gas temperature sensor
  • Open circuit in EGR gas temperature sensor circuit or loose connector contact
  • Failed engine-ECU

  • DIAGNOSIS PROCEDURE

    STEP 1. M.U.T.-III data list

  • Item 8: EGR gas temperature sensor
  • Q. Is the check result normal?

    STEP 2. Connector check: A-157 EGR gas temperature sensor connector

    Q. Is the check result normal?

    STEP 3. Check EGR gas temperature sensor itself.

    Q. Is the check result normal?

    STEP 4. Perform voltage measurement at A-157 EGR gas temperature sensor connector.

  • Disconnect connector, and measure at harness side.
  • Ignition switch: ON
  • Voltage between terminal No. 2 and earth.
  • Q. Is the check result normal?

    STEP 5. Connector check: C-105 engine-ECU connector

    Q. Is the check result normal?

    STEP 6. Check harness between A-157 (terminal No. 2) EGR gas temperature sensor connector and C-105 (terminal No. 36) engine-ECU connector.

  • Check output line for open circuit.
  • Q. Is the check result normal?

    STEP 7. M.U.T.-III data list

  • Item 8: EGR gas temperature sensor
  • Q. Is the check result normal?

    STEP 8. Perform resistance measurement at A-157 EGR gas temperature sensor connector.

  • Disconnect connector, and measure at harness side.
  • Resistance between terminal No. 1 and earth.
  • Q. Is the check result normal?

    STEP 9. Connector check: C-105 engine-ECU connector

    Q. Is the check result normal?

    STEP 10. Check harness between A-157 (terminal No. 1) EGR gas temperature sensor connector and C-105 (terminal No. 30) engine-ECU connector.

  • Check earthing line for open circuit.
  • Q. Is the check result normal?

    STEP 11. Connector check: C-105 engine-ECU connector

    Q. Is the check result normal?

    STEP 12. Check harness between A-157 (terminal No. 2) EGR gas temperature sensor connector and C-105 (terminal No. 36) engine-ECU connector.

  • Check output line for damage.
  • Q. Is the check result normal?

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