P0515 – Battery Temperature Sensor System MMC L200 IV



OPERATION

  • A power voltage of 5 V is applied to the battery temperature sensor output terminal (terminal No. 2) from the engine-ECU (terminal No. 39).
  • The power voltage is earthed to the engine-ECU (terminal No. 155) from the battery temperature sensor (terminal No. 3).

  • FUNCTION

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

  • TROUBLE JUDGEMENT

  • 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 battery temperature sensor output voltage is more than 4.88 V.
  • The battery temperature sensor output voltage is less than 0.99 V.

  • PROBABLE CAUSES

  • Failed battery temperature sensor
  • Open/short circuit or harness damage in battery temperature sensor circuit or loose connector contact
  • Failed engine-ECU

  • DIAGNOSIS PROCEDURE

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

  • Item No. 402: Battery temperature sensor
  • Q. Is the check result normal?

    STEP 2. Connector check: A-152 battery current sensor connector

    Q. Is the check result normal?

    STEP 3. Check battery temperature sensor itself.

    Q. Is the check result normal?

    STEP 4. Perform voltage measurement at A-152 battery current 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-152 (terminal No. 2) battery current sensor connector and C-105 (terminal No. 39) engine-ECU connector.

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

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

  • Item No. 402: Battery temperature sensor
  • Q. Is the check result normal?

    STEP 8. Perform resistance measurement at A-152 battery current sensor connector.

  • Disconnect connector and measure at harness side.
  • Resistance between terminal No. 3 and earth.
  • Q. Is the check result normal?

    STEP 9. Connector check: C-103 engine-ECU connector

    Q. Is the check result normal?

    STEP 10. Check harness between A-152 (terminal No. 3) battery current sensor connector and C-103 (terminal No. 155) engine-ECU connector.

  • Check earthing line for open circuit and damage.
  • 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-152 (terminal No. 2) battery current sensor connector and C-105 (terminal No. 39) engine-ECU connector.

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

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