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Home >> Infiniti >> 2021 >> Q50 Pure, AWD >> Repair and Diagnosis >> Engine Performance >> System >> Engine Control System (DTCS) (5 Of 6) >> Engine (ECM) >> P1554 Battery Current Sensor >> DTC Diagnosis Procedure >> VR30DDTT engine

VR30DDTT engine

  1. CHECK GROUND CONNECTION 
    1. Turn ignition switch OFF.
    2. Check ground connection E191. Refer to Ground Inspection in 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

      E7

      4

      Ground

      Approx. 5

    Is the inspection result normal?

    YES

    GO TO 4.

    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

      E7

      4

      F143

      42

      Existed

    Is the inspection result normal?

    YES

    GO TO 5.

    NO

    GO TO 4.

  4. 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

      E7

      2

      F143

      29

      Existed

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

    Is the inspection result normal?

    YES

    GO TO 5.

    NO

    Repair or replace error-detected parts.

  5. 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

      E7

      1

      F143

      56

      Existed

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

    Is the inspection result normal?

    YES

    GO TO 6.

    NO

    Repair or replace error-detected parts.

  6. CHECK BATTERY CURRENT SENSOR 

    Refer to Component Inspection .

    Is the inspection result normal?

    YES

    INSPECTION END

    NO

    Replace battery negative cable assembly.