Posted in Mitsubishi Colt

P1608 – Battery Current 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 current sensor power terminal (terminal No. 1) from the engine-ECU (terminal No. 110) and earthed to the engine-ECU (terminal No. 112) from the battery current sensor (terminal No. 3).
  • The sensor signal is inputted to the engine-ECU (terminal No. 111) from the battery current sensor output terminal (terminal No. 4).

    • FUNCTION

  • The battery current sensor detects the battery current to input it into the engine-ECU.
  • In response to the signal, the engine-ECU controls the discharge and charge control.

    • TROUBLE JUDGMENT

  • 2 seconds later after the ignition switch has been in “ON” position or the engine has started up.
  • The battery current sensor output voltage is 4.8 V or more for 2 seconds.
  • The battery current sensor output voltage is 0.2 V or less for 2 seconds.

    • PROBABLE CAUSES

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

    • DIAGNOSIS PROCEDURE

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

  • Item No. 159: Battery current 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 current sensor itself.

    Q. Is the check result normal?

    STEP 4. Perform voltage measurement at A-39 battery current sensor connector.

  • Disconnect connector, and measure at harness side.
  • Ignition switch: ON
  • Voltage between terminal No. 1 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. 1) battery current sensor connector and A-09 (terminal No. 110) engine-ECU connector.

  • Check power supply line for open/short circuit.

    • Q. Is the check result normal?

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

  • Item No. 159: Battery current sensor

    • Q. Is the check result normal?

    STEP 8. 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 9. Connector check: A-09 engine-ECU connector

    Q. Is the check result normal?

    STEP 10. 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 11. Connector check: A-09 engine-ECU connector

    Q. Is the check result normal?

    STEP 12. Check harness between A-39 (terminal No. 1) battery current sensor connector and A-09 (terminal No. 110) engine-ECU connector.

  • Check power supply line for damage.

    • Q. Is the check result normal?

    STEP 13. Check harness between A-39 (terminal No. 4) battery current sensor connector and A-09 (terminal No. 111) engine-ECU connector.

  • Check output line for open/short circuit and damage.

    • Q. Is the check result normal?

    Author: admin