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Home >> Infiniti >> 2017 >> QX70 RWD >> Repair and Diagnosis >> External Pages >> Different car >> Section 191 (Hybrid Battery System (Introduction And Diagnostic Trouble Codes (DTCS)) P0A09-P0C6E) (Hybrid)) >> DTC / Circuit Diagnosis >> DTC P0AC2: Hybrid Battery Pack Current Sensor >> Diagnosis Procedure

Diagnosis Procedure

WARNING: This page is about a different car, the 2016 Infiniti Q50. However, it is still accessible from the selected car via links, so may be relevant.
CAUTION:

ELECTRIC_SHOCK Since hybrid vehicles and electric vehicles contain a high voltage battery, there is the risk of electric shock, electric leakage, or similar accidents if the high voltage component and vehicle are handled incorrectly. Be sure to follow the correct work procedures when performing inspection and maintenance.

WARNING:
  • Be sure to remove the service plug in order to disconnect the high voltage circuits before performing inspection or maintenance of high voltage system harnesses and parts.
  • The removed service plug must always be carried in a pocket of the responsible worker or placed in the tool box during the procedure to prevent the plug from being connected by mistake.
  • Be sure to wear insulating protective equipment before beginning work on the high voltage system.
  • Never allow workers other than the responsible person to touch the vehicle containing high voltage parts. To keep others from touching the high voltage parts, these parts must be covered with an insulating sheet except when using them.
  • Refer to HIGH VOLTAGE PRECAUTIONS .
CAUTION:

Never bring the vehicle into the READY status with the service plug removed unless otherwise instructed in the Service Information. A malfunction may occur if this is not observed.

  1. PERFORM SELF-DIAGNOSIS

    G-20 WITH CONSULT

    1. Perform "All DTC Reading" with CONSULT.
    2. Check if the "P0AA0" or "P0AA1" are detected in "Self Diagnostic Result" of "EV/HEV".

    Is DTC detected?

    YES 

    Perform diagnosis procedure of hybrid control system. Refer to DTC INDEX .

    NO 

    GO TO STEP 2  .

  2. PRECONDITIONING

    WARNING:

    Follow the instructions below before starting the procedure.

    1. Disconnect high voltage circuit. Refer to HOW TO DISCONNECT HIGH VOLTAGE .
    2. Check voltage in high voltage circuit. Refer to CHECK VOLTAGE IN HIGH VOLTAGE CIRCUIT .

    GO TO STEP 3  .

  3. CHECK CURRENT SENSOR HARNESS

    1. Remove Li-ion battery. Refer to REMOVAL AND INSTALLATION .
    2. Disconnect battery junction box harness connector.
    3. Disconnect Li-ion battery controller harness connector.
    4. Check continuity between battery junction box (current sensor) harness connector and Li-ion battery controller harness connector.
    Battery junction box
    (current sensor)    		 Li-ion battery controller Continuity
    Connector Terminal Connector Terminal
    LB34 4 LB1 9 Existed
    5 15
    6 10

    Is the inspection result normal?

    YES 

    GO TO STEP 4  .

    NO 

    Repair harness or connector.

  4. CHECK CURRENT SENSOR

    Refer to COMPONENT INSPECTION .

    Is the inspection result normal?

    YES 

    GO TO STEP 5  .

    NO 

    Replace battery junction box (current sensor). Refer to DISASSEMBLY AND ASSEMBLY .

  5. CHECK RESISTANCE OF LI-ION BATTERY CONTROLLER

    Check resistance between Li-ion battery controller terminals.

    Li-ion battery controller Resistance
    Connector Terminal Connector Terminal
    LB1 10 LB1 15 Approx. 4.7 kΩ

    Is the inspection result normal?

    YES 

    Replace Li-ion battery controller (Refer to DISASSEMBLY AND ASSEMBLY ) and battery junction box (Refer to DISASSEMBLY AND ASSEMBLY ).

    NO 

    Replace Li-ion battery controller. Refer to DISASSEMBLY AND ASSEMBLY .

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