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HOMESERVICE MANUALSINFINITI2019Q70 3.7 LUXE, AWDREPAIR AND DIAGNOSISEXTERNAL PAGESDIFFERENT VARIANT/TRIMSECTION 13 (ENGINE CONTROL SYSTEM (5.6L) (DTC/CIRCUIT DIAGNOSIS) (6 OF 9))DTC/CIRCUIT DIAGNOSISDTC P1551, P1552: BATTERY CURRENT SENSORDIAGNOSIS PROCEDURE
2019 Infiniti Q70 3.7 Luxe, AWD

Diagnosis Procedure

2019 Infiniti Q70 3.7 Luxe, AWDSECTION Diagnosis Procedure
WARNING: This page is about a different variant/trim than selected.
  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

      E21

      1

      Ground

      Approx. 5

    Is the inspection result normal?

    YES

    GO TO 7.

    NO

    GO TO 2.

  2. CHECK BATTERY CURRENT SENSOR POWER SUPPLY CIRCUIT-II 
    1. Turn ignition switch ON.
    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

      F116

      30

      Existed

    Is the inspection result normal?

    YES

    GO TO 3.

    NO

    Repair open circuit.

  3. 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

    F116

    29

    Refrigerant pressure sensor

    E77

    3

    29

    Fuel rail pressure sensor

    F6

    1

    29

    Manifold absolute pressure sensor

    F19

    1

    29

    Engine oil pressure sensor

    F32

    3

    29

    Power steering pressure sensor

    F35

    3

    F117

    73

    Exhaust valve timing control position sensor (bank 2)

    F63

    1

    73

    Camshaft position sensor (bank 2)

    F83

    1

    75

    Throttle position sensor (bank 2)

    F64

    2

    M56

    142

    Accelerator Pedal Position Sensor 2 (Without ICC)

    M9

    6

    142

    Accelerator Pedal Position Sensor 2 (With ICC)

    M154

    10

    Is the inspection result normal?

    YES

    GO TO 4.

    NO

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

  4. CHECK COMPONENTS 

    Check the following.

    Is the inspection result normal?

    YES

    GO TO 5.

    NO

    Replace malfunctioning component.

  5. CHECK APP SENSOR 

    Refer to Component Inspection (Accelerator Pedal Position Sensor) .

    Is the inspection result normal?

    YES

    GO TO 10.

    NO

    GO TO 6.

  6. REPLACE ACCELERATOR PEDAL ASSEMBLY 

    Replace accelerator pedal assembly. Refer to following.

    INSPECTION END

  7. 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

      3

      F116

      43

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

    Is the inspection result normal?

    YES

    GO TO 8.

    NO

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

  8. 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

      4

      F116

      38

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

    Is the inspection result normal?

    YES

    GO TO 9.

    NO

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

  9. CHECK BATTERY CURRENT SENSOR 

    Refer to Component Inspection (Battery Current Sensor) .

    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

RENDER: 1.0x

NO RELATED

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When to See a Mechanic

Stop DIY work and contact a certified mechanic immediately if any of the following apply:

  • • You smell fuel, burning insulation, or see smoke.
  • • Brakes feel soft, pull hard to one side, or make grinding noises.
  • • The engine overheats, stalls repeatedly, or misfires under load.
  • • You are missing required tools, torque specs, or safe lifting equipment.
  • • You are not confident in the next step or safety outcome.