Posted in MMC L200

P1608 – Battery Current Sensor System MMC L200 IV

 Posted by  Posted on September 29, 2020

OPERATION

  • A power voltage of 5 V is supplied to the battery current sensor (terminal No. 1) from the engine-ECU (terminal No. 148) and is earthed to the engine-ECU (terminal No. 155) from the battery current sensor (terminal No. 3).
  • The battery current sensor (terminal No. 4) outputs a sensor signal, which is input into the engine-ECU (terminal No. 138).

    • FUNCTION

  • The battery current sensor detects a battery current and inputs a signal into the engine-ECU.
  • In response to the signal, the engine-ECU controls charging and discharging.

    • TROUBLE JUDGMENT

  • Ignition switch is in “ON” position.
  • The battery current sensor output voltage is 0.2 V or less.
  • The battery current sensor output voltage is 4.8 V or more.

    • PROBABLE CAUSES

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

    • DIAGNOSIS PROCEDURE

    STEP 1. Connector check: A-152 battery current sensor connector

    Q. Is the check result normal?

    STEP 2. Check battery current sensor itself.

    Q. Is the check result normal?

    STEP 3. Perform voltage measurement at A-152 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 4. Connector check: C-103 engine-ECU connector

    Q. Is the check result normal?

    STEP 5. Check harness between A-152 (terminal No. 1) battery current sensor connector and C-103 (terminal No. 148) engine-ECU connector.

  • Check power supply line for open/short circuit.

    • Q. Is the check result normal?

    STEP 6. M.U.T.-III diagnosis code

  • Reconfirmation of diagnosis code.

    • Q. Is the diagnosis code set?

    STEP 7. 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 8. Connector check: C-103 engine-ECU connector

    Q. Is the check result normal?

    STEP 9. 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 10. Connector check: C-103 engine-ECU connector

    Q. Is the check result normal?

    STEP 11. Check harness between A-152 (terminal No. 1) battery current sensor connector and C-103 (terminal No. 148) engine-ECU connector.

  • Check power supply line for damage.

    • Q. Is the check result normal?

    STEP 12. Check harness between A-152 (terminal No. 4) battery current sensor connector and C-103 (terminal No. 138) engine-ECU connector.

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

    • Q. Is the check result normal?

    Author: admin