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Home >> Infiniti >> 2008 >> G37 Base >> Repair and Diagnosis >> Engine Performance >> Engine Control Systems >> Engine Control System - G37 Coupe - DTC P1148 Through P2A03 >> P1554 Battery Current Sensor >> Diagnosis Procedure

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.
      TERMINALS VOLTAGE REFERENCE

      Battery current sensor Ground Voltage
      Connector Terminal
      E21 1 Ground Approx. 5V

    Is the inspection result normal? 

    YES: GO TO  5.

    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.
      TERMINALS CONTINUITY REFERENCE

      Battery current sensor ECM Continuity
      Connector Terminal Connector Terminal
      E21 1 F102 64 Existed
    4. Also check harness for short to ground and short to power.

    Is the inspection result normal? 

    YES: GO TO  5.

    NO: GO TO 4.

  4. DETECT MALFUNCTIONING PART

    Check the following.

    • Harness connectors F1, E3
    • Harness for open or short between battery current sensor and ECM

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

  5. 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.
      TERMINALS CONTINUITY REFERENCE

      Battery current sensor ECM Continuity
      Connector Terminal Connector Terminal
      E21 2 F102 95 Existed
    4. Also check harness for short to ground and short to power.

    Is the inspection result normal? 

    YES: GO TO  7.

    NO: GO TO 6.

  6. DETECT MALFUNCTIONING PART

    Check the following.

    • Harness connectors F1, E3
    • Harness for open or short between battery current sensor and ECM

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

  7. 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.
      TERMINALS CONTINUITY REFERENCE

      Battery current sensor ECM Continuity
      Connector Terminal Connector Terminal
      E21 3 F102 91 Existed
    2. Also check harness for short to ground and short to power.

    Is the inspection result normal? 

    YES: GO TO  9.

    NO: GO TO 8.

  8. DETECT MALFUNCTIONING PART

    Check the following.

    • Harness connectors F1, E3
    • Harness for open or short between battery current sensor and ECM

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

  9. CHECK BATTERY CURRENT SENSOR

    Refer to "COMPONENT INSPECTION ".

    Is the inspection result normal? 

    YES: GO TO 10.

    NO: Replace battery negative cable assembly.

  10. CHECK INTERMITTENT INCIDENT

    Refer to "INTERMITTENT INCIDENT ".

    INSPECTION END

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