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Home >> Infiniti >> 2012 >> M35h >> Repair and Diagnosis >> Engine Performance >> System >> Engine Control System - DTCS P0500 To P31A5 >> DTC P1550: Battery Current Sensor >> Diagnosis Procedure
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Diagnosis Procedure

  1. CHECK GROUND CONNECTION
    1. Turn ignition switch OFF.
    2. Check ground connection M95. Refer to Ground Inspection in "CIRCUIT INSPECTION ".

      Is the inspection result normal? 

      YES: GO TO 2.

      NO: Repair or replace ground connection.

  2. CHECK BATTERY CURRENT SENSOR POWER SUPPLY CIRCUIT-I
    1. Disconnect battery current sensor harness connector.
    2. Turn ignition switch ON.
    3. Check the voltage between battery current sensor harness connector and ground.
      Battery current sensor Ground Voltage (V)
      Connector Terminal
      B10 1 Ground Approx. 5

      Is the inspection result normal? 

      YES: GO TO  6.

      NO: GO TO 3.

  3. CHECK BATTERY CURRENT SENSOR POWER SUPPLY CIRCUIT-II
    1. Turn ignition switch OFF.
    2. Disconnect ECM harness connector.
    3. Check the continuity between battery current sensor harness connector and ECM harness connector.
      Battery current sensor ECM Continuity
      Connector Terminal Connector Terminal
      B10 1 F101 45 Existed

      Is the inspection result normal? 

      YES: GO TO  5.

      NO: GO TO 4.

  4. DETECT MALFUNCTIONING PART

    Check the following.

    • Harness connectors F103, M116
    • Harness connectors B14, M12
    • Harness for open between battery current sensor and ECM

      : Repair open circuit.

  5. CHECK SENSOR POWER SUPPLY 2 CIRCUIT

    Check sensor power supply 2 circuit. Refer to "DIAGNOSIS PROCEDURE ".

    Is the inspection result normal? 

    YES: GO TO  11.

    NO: Repair short to ground or short to power in harness or connectors.

  6. CHECK BATTERY CURRENT SENSOR GROUND CIRCUIT FOR OPEN AND SHORT
    1. Turn ignition switch OFF.
    2. Disconnect ECM harness connector.
    3. Check the continuity between battery current sensor harness connector and ECM harness connector.
      Battery current sensor ECM Continuity
      Connector Terminal Connector Terminal
      B10 2 F102 95 Existed
    4. Also check harness for short to ground and short to power.

      Is the inspection result normal? 

      YES: GO TO  8.

      NO: GO TO 7.

  7. DETECT MALFUNCTIONING PART

    Check the following.

    • Harness connectors F103, M116
    • Harness connectors B14, M12
    • Harness for open or short between battery current sensor and ECM

      : Repair open circuit, short to ground or short to power in harness or connectors.

  8. CHECK BATTERY CURRENT SENSOR INPUT SIGNAL CIRCUIT FOR OPEN AND SHORT
    1. Check the continuity between battery current sensor harness connector and ECM harness connector.
      Battery current sensor ECM Continuity
      Connector Terminal Connector Terminal
      B10 3 F102 91 Existed
    2. Also check harness for short to ground and short to power.

      Is the inspection result normal? 

      YES: GO TO  10.

      NO: GO TO 9.

  9. DETECT MALFUNCTIONING PART

    Check the following.

    • Harness connectors F103, M116
    • Harness connectors B14, M12
    • Harness for open or short between battery current sensor and ECM

      : Repair open circuit, short to ground or short to power in harness or connectors.

  10. CHECK BATTERY CURRENT SENSOR

    Refer to "COMPONENT INSPECTION ".

    Is the inspection result normal? 

    YES: GO TO 11.

    NO: Replace 12V battery negative cable assembly.

  11. CHECK INTERMITTENT INCIDENT

    Refer to "INTERMITTENT INCIDENT ".

    : INSPECTION END

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