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Home >> Infiniti >> 2010 >> M45 Base >> Repair and Diagnosis >> Engine Performance >> System >> Engine Control System - DTCS P1550 To P2A03 >> DTC P1554 Battery Current Sensor >> Diagnosis Procedure
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Diagnosis Procedure

  1. CHECK GROUND CONNECTIONS
    1. Turn ignition switch OFF.
    2. Loosen and retighten ground screws on the body.

    Refer to "GROUND INSPECTION ".

    Fig 1: Identifying Body Ground (M70 And M16)
    G06303361Courtesy of NISSAN MOTOR CO., U.S.A.

    OK or NG 

    OK: GO TO 2.

    NG: Repair or replace ground connections.

  2. CHECK BATTERY CURRENT SENSOR POWER SUPPLY CIRCUIT
    1. Disconnect battery current sensor (1) harness connector.
    2. Turn ignition switch ON.
      Fig 2: Identifying Battery Current Sensor Harness Connector
      G05210016Courtesy of NISSAN MOTOR CO., U.S.A.
    3. Check voltage between battery current sensor terminal 1 and ground with CONSULT-III or tester.

    Voltage: Approximately 5 V 

    OK or NG 

    OK: GO TO  4.

    NG: GO TO 3.

    Fig 3: Checking Voltage Between Battery Current Sensor Terminal 1 And Ground
    G04900631Courtesy of NISSAN MOTOR CO., U.S.A.
  3. DETECT MALFUNCTIONING PART

    Check the following.

    • Harness connectors E11, F2
    • 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.

  4. CHECK BATTERY CURRENT SENSOR GROUND CIRCUIT FOR OPEN AND SHORT
    1. Turn ignition switch OFF.
    2. Disconnect ECM harness connector.
    3. Check harness continuity between battery current sensor terminal 2 and ECM terminal 67.

      Refer to SYSTEM WIRING DIAGRAMS article.

      Continuity should exist  .

    4. Also check harness for short to ground and short to power.

    OK or NG 

    OK: GO TO  6.

    NG: GO TO 5.

  5. DETECT MALFUNCTIONING PART

    Check the following.

    • Harness connectors E73, F68
    • 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.

  6. CHECK BATTERY CURRENT SENSOR INPUT SIGNAL CIRCUIT FOR OPEN AND SHORT
    1. Check harness continuity between battery current sensor terminal 3 and ECM terminal 71.

      Refer to SYSTEM WIRING DIAGRAMS article.

      Continuity should exist  .

    2. Also check harness for short to ground and short to power.

    OK or NG 

    OK: GO TO  8.

    NG: GO TO 7.

  7. DETECT MALFUNCTIONING PART

    Check the following.

    • Harness connectors E73, F68
    • 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.

  8. CHECK BATTERY CURRENT SENSOR

    Refer to "COMPONENT INSPECTION ".

    OK or NG 

    OK: GO TO 9.

    NG: Replace battery negative cable assembly.

  9. CHECK INTERMITTENT INCIDENT

    Refer to "DIAGNOSIS PROCEDURE ".

    INSPECTION END 

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