LEMON Manuals: Even more car manuals for everyone: 1960-2025
Home >> Infiniti >> 2013 >> FX50 >> Repair and Diagnosis >> Engine Performance >> System >> Engine Control System - DTCS P1212 Through P2138 >> DTC P1554: Battery Current Sensor >> Diagnosis Procedure
April 5, 2026: LEMON Manuals is launched! Read the announcement.

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
      E21 1 Ground Approx. 5

      Is the inspection result normal? 

      YES: GO TO  9.

      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
      E21 1 F111 95 Existed

      Is the inspection result normal? 

      YES: GO TO  5.

      NO: GO TO 4.

  4. DETECT MALFUNCTIONING PART 

    Check the following.

    • Harness connectors F10, E10
    • Harness for open between battery current sensor and ECM

      : Repair open circuit.

  5. CHECK SENSOR POWER SUPPLY CIRCUIT 

    Check harness for short to power and short to ground, between the following terminals.

    ECM Sensor
    Connector Terminal Name Connector Terminal
    F111 87 Crankshaft position sensor F2 1
    91 Camshaft position sensor (bank 1) F84 1
    EVT control position sensor (bank 1) F59 1
    95 Battery current sensor E21 1
    EVAP control system pressure sensor(1) B252 3
    Manifold absolute pressure sensor F65 1
    M160 99 APP sensor 2 (Without ICC) E112 6
    APP sensor 2 (with ICC) E116 3
    (1) Except for Mexico

    Is the inspection result normal? 

    YES: GO TO 6.

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

  6. CHECK COMPONENTS 

    Check the following.

  7. CHECK APP SENSOR 

    Refer to "COMPONENT INSPECTION ".

    Is the inspection result normal? 

    YES: GO TO  14.

    NO: GO TO 8.

  8. REPLACE ACCELERATOR PEDAL ASSEMBLY 
    1. Replace accelerator pedal assembly.
    2. Perform "SPECIAL REPAIR REQUIREMENT ".

      : INSPECTION END

  9. 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
      E21 2 F111 70 Existed
    4. Also check harness for short to ground and short to power.

      Is the inspection result normal? 

      YES: GO TO  11.

      NO: GO TO 10.

  10. DETECT MALFUNCTIONING PART 

    Check the following.

    • Harness connectors F10, E10
    • 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.

  11. 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
      E21 3 F111 76 Existed
    2. Also check harness for short to ground and short to power.

      Is the inspection result normal? 

      YES: GO TO  13.

      NO: GO TO 12.

  12. DETECT MALFUNCTIONING PART 

    Check the following.

    • Harness connectors F10, E10
    • 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.

  13. CHECK BATTERY CURRENT SENSOR 

    Refer to "COMPONENT INSPECTION ".

    Is the inspection result normal? 

    YES: GO TO 14.

    NO: Replace battery negative cable assembly.

  14. CHECK INTERMITTENT INCIDENT 

    Refer to "INTERMITTENT INCIDENT ".

    : INSPECTION END

scientia non olet · About LEMON Manuals