Posted in Mitsubishi Colt

P0515 – Battery Temperature Sensor System Vehicles with AS&G system MMC Colt

 Posted by  Posted on September 26, 2020

OPERATION

  • A power voltage of 5 V is applied to the battery temperature sensor output terminal (terminal No. 2) of the battery current sensor connector from the engine-ECU (terminal No. 131).
  • The power voltage is earthed to the engine-ECU (terminal No. 112) from the battery temperature sensor (terminal No. 3).

    • FUNCTION

  • The battery temperature sensor converts the battery temperature into a voltage and inputs the voltage signal to the engine-ECU.
  • In response to the signal, the engine-ECU controls the discharge and charge control.
  • 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 JUDGMENT

  • 2 seconds later after the ignition switch has been in “ON” position or the engine has started up.
  • The sensor output voltage is 4.6 V or more (battery temperature of below -50°C or equivalent) for 2 seconds.
  • The sensor output voltage is 0.2 V or less (battery temperature of above 100°C or equivalent) for 2 seconds.

    • PROBABLE CAUSES

  • Failed battery temperature sensor
  • Open or shorted battery temperature sensor circuit, harness damage, or connector damage
  • Failed engine-ECU

    • DIAGNOSIS PROCEDURE

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

  • Item No. 160: Battery temperature sensor

    • Q. Is the check result normal?

    STEP 2. Connector check: A-39 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 resistance measurement at A-39 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 5. Connector check: A-09 engine-ECU connector

    Q. Is the check result normal?

    STEP 6. Check harness between A-39 (terminal No. 3) battery current sensor connector and A-09 (terminal No. 112) engine-ECU connector.

  • Check earthing line for open circuit and damage.

    • Q. Is the check result normal?

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

  • Item No. 160: Battery temperature sensor

    • Q. Is the check result normal?

    STEP 8. Perform voltage measurement at A-39 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 9. Connector check: A-09 engine-ECU connector

    Q. Is the check result normal?

    STEP 10. Check harness between A-39 (terminal No. 2) battery current sensor connector and A-09 (terminal No. 131) engine-ECU connector.

  • Check output line for open/short circuit.

    • Q. Is the check result normal?

    STEP 11. Connector check: A-09 engine-ECU connector

    Q. Is the check result normal?

    STEP 12. Check harness between A-39 (terminal No. 2) battery current sensor connector and A-09 (terminal No. 131) engine-ECU connector.

  • Check output line for damage.

    • Q. Is the check result normal?

    Author: admin