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Home >> Infiniti >> 2012 >> QX56 AWD >> Repair and Diagnosis >> Engine Performance >> System >> Engine Control System - DTCS P1550 To P2A03 >> DTC P1553: Battery Current Sensor >> Diagnosis Procedure

Diagnosis Procedure

  1. 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
    E63 2 Ground Approx. 5

    Is the inspection result normal? 

    YES: GO TO  8.

    NO: GO TO 2.

  2. 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
    E63 2 E80 133 Existed

    Is the inspection result normal? 

    YES: GO TO  4.

    NO: GO TO 3.

  3. DETECT MALFUNCTIONING PART

    Check the following.

    • Harness for open between battery current sensor and ECM
    • Loose or poor connection for each connector and harness

    : Repair open circuit.

  4. 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
    F110 76 Crankshaft position sensor F74 1
    77 Camshaft position sensor (bank 1) F84 1
    E80 133 EVAP control system pressure sensor C17 3
    Refrigerant pressure sensor E77 1
    131 APP sensor 2 (Without ICC) E110 1
    APP sensor 2 (with ICC) E67 9

    Is the inspection result normal? 

    YES: GO TO 5.

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

  5. CHECK COMPONENTS

    Check the following.

    Is the inspection result normal? 

    YES: GO TO 6.

    NO: Replace malfunctioning component.

  6. CHECK APP SENSOR

    Refer to "COMPONENT INSPECTION (ACCELERATOR PEDAL POSITION SENSOR) ".

    Is the inspection result normal? 

    YES: GO TO  13.

    NO: GO TO 7.

  7. REPLACE ACCELERATOR PEDAL ASSEMBLY

    Replace accelerator pedal assembly. Refer to "MODELS WITHOUT DISTANCE CONTROL ASSIST SYSTEM: REMOVAL AND INSTALLATION " (Without distance control assist system) or "MODELS WITH DISTANCE CONTROL ASSIST SYSTEM: REMOVAL AND INSTALLATION " (With distance control assist system).

    : INSPECTION END

  8. 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
      E63 4 E80 150 Existed
    4. 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 for open or short between battery current sensor and ECM
    • Loose or poor connection for each connector and harness

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

  10. 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
      E63 3 E80 138 Existed
    2. Also check harness for short to ground and short to power.

    Is the inspection result normal? 

    YES: GO TO  12.

    NO: GO TO 11.

  11. DETECT MALFUNCTIONING PART

    Check the following.

    • Harness for open or short between battery current sensor and ECM
    • Loose or poor connection for each connector and harness

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

  12. CHECK BATTERY CURRENT SENSOR

    Refer to "COMPONENT INSPECTION (BATTERY CURRENT SENSOR) ".

    Is the inspection result normal? 

    YES: GO TO 13.

    NO: Replace battery negative cable assembly.

  13. CHECK INTERMITTENT INCIDENT

    Refer to "INTERMITTENT INCIDENT ".

    : INSPECTION END

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