AIR CONDITIONING SYSTEM, Diagnostic DTC:P0AA6-611

DTC Code DTC Name
P0AA6-611 Hybrid Battery Voltage System Isolation Fault

DESCRIPTION

This DTC is stored if there is insulation malfunction in the high-voltage circuit in the air conditioning system. Possible causes are poor insulation in the compressor with motor assembly, or mixing of any oil other than ND-OIL 11 in the refrigerant cycle.

A high-voltage motor is built into the compressor with motor assembly and is cooled directly with refrigerant. Compressor oil (ND-OIL 11) with high insulation performance is used because a leakage of electrical power may occur if regular compressor oil (ND-OIL 8) is used.

CAUTION:

  • Wear insulated gloves and pull out the service plug grip before inspection as procedures may require disconnecting high-voltage connectors. Carry the removed service plug in your pocket to prevent other technicians from accidentally reconnecting it while you are servicing the vehicle.

  • Do not touch the high-voltage connectors or terminals for 10 minutes after the service plug grip is removed.

DTC No.

Detection Item

DTC Detection Condition

Trouble Area

Memory

Note

P0AA6-611

Hybrid Battery Voltage System Isolation Fault

High voltage system insulation malfunction

  • Compressor oil

  • Refrigerant pipe line

  • Compressor with motor assembly

  • CAN communication system

Memorized

-

WIRING DIAGRAM

E313773E04

CAUTION / NOTICE / HINT

CAUTION:

  • Wear insulated gloves and pull out the service plug grip before inspection as procedures may require disconnecting high-voltage connectors. Carry the removed service plug in your pocket to prevent other technicians from accidentally reconnecting it while you are servicing the vehicle.

  • Do not touch the high-voltage connectors or terminals for 10 minutes after the service plug grip is removed.

Note:

  • After turning the power switch off, waiting time may be required before disconnecting the cable from the negative (-) auxiliary battery terminal. Therefore, make sure to read the disconnecting the cable from the negative (-) auxiliary battery terminal notices before proceeding with work.

    Click hereClick hereClick hereClick here

  • Electrical insulation performance may decrease significantly if even a small amount of oil other than ND-OIL 11 is used (or enters) in the refrigerant cycle, causing a DTC to be output.

  • If other oil is accidentally used and a DTC is output, collect as much oil in the refrigerant cycle into the compressor with motor assembly as possible and replace it with ND-OIL 11 to increase the ND-OIL 11 ratio amount.

  • Replace the main components of the air conditioning cycle (evaporator, condenser, and compressor) if a large amount of oil other than ND-OIL 11 enters the system. Failing to do so may cause electrical insulation performance to remain low, causing a DTC to be output.

  • The hybrid control system and air conditioning system output DTCs separately. Perform troubleshooting for the hybrid control system first if DTCs from these systems are output simultaneously.

Tip:

If it can be confirmed that any compressor oil other than ND-OIL 11 has been used in the vehicle, replace the main components of the air conditioning cycle.

PROCEDURE

  1. CHECK CAN COMMUNICATION SYSTEM

    1. Using the GTS, check if the CAN communication system is functioning normally.

    Result

    Result

    Proceed to

    CAN communication system DTCs are not output

    A

    CAN communication system DTCs are output

    B
    B

    GO TO CAN COMMUNICATION SYSTEM

    A

  2. INSPECT COMPRESSOR WITH MOTOR ASSEMBLY

    CAUTION:

    Because the compressor with motor assembly has a high-voltage circuit, wear insulated gloves and pull out the service plug grip to cut off the high-voltage circuit before inspection.

    1. Clear the DTCs.

      Click here

      Body Electrical > Air Conditioner > Clear DTCs

    2. Turn the power switch on (READY).

    3. Prepare the vehicle according to the table below for 3 minutes.

      Item

      Condition

      Blower speed

      HI

      Temperature setting

      MAX COLD

      A/C switch

      On

    4. Turn the power switch off.

    5. Remove the service plug grip.

      Click here

    6. E285221C05

      *a

      Component without harness connected

      (Compressor with Motor Assembly)

      Disconnect the compressor with motor assembly connector.

    7. Using a megohmmeter, measure the resistance according to the value(s) in the table below.

      Standard Resistance

      Tester Connection

      Condition

      Specified Condition

      B111-1 (PE) - Body ground

      Always

      2 MΩ or higher

      B111-2 (PB) - Body ground

      Always

      2 MΩ or higher
    CAUTION:

    Do not touch the high-voltage connectors or terminals for 10 minutes after the service plug grip is removed.

    Note:

    After removing the service plug grip, turning the power switch on (READY) may cause a malfunction. Do not turn the power switch on (READY) with the service plug grip removed.

    Result

    Proceed to

    OK

    NG
    NG

    REPLACE COMPRESSOR WITH MOTOR ASSEMBLY

    Click here

    OK

  3. INSPECT AIR CONDITIONING CYCLE

    CAUTION:

    Because the compressor with motor assembly has a high-voltage circuit, wear insulated gloves and pull out the service plug grip to cut off the high-voltage circuit before inspection.

    1. Reconnect the B111 the compressor with motor assembly connector.

    2. Install the service plug grip.

      Click here

    3. Turn the power switch on (READY).

    4. Set the A/C temperature to 25°C (77°F) and blower switch to LO and then operate the compressor with motor assembly for 10 minutes to circulate the refrigerant and collect as much compressor oil as possible in the compressor with motor assembly.

    5. Turn the power switch off.

    6. Using a spot cooler or other tool, cool down the compressor with motor assembly for 30 minutes, or leave the vehicle overnight before inspection.

      Note:

      Do not operate the compressor before inspection.

    7. Remove the service plug grip.

      Click here

      CAUTION:

      Do not touch the high-voltage connectors or terminals for 10 minutes after the service plug grip is removed.

      Note:

      After removing the service plug grip, turning the power switch on (READY) may cause a malfunction. Do not turn the power switch on (READY) with the service plug grip removed.

    8. E285221C05

      *a

      Component without harness connected

      (Compressor with Motor Assembly)

      Disconnect the compressor with motor assembly connector.

    9. Using a megohmmeter, measure the resistance according to the value(s) in the table below.

      Standard Resistance

      Tester Connection

      Condition

      Specified Condition

      B111-1 (PE) - Body ground

      Always

      3 MΩ or higher

      B111-2 (PB) - Body ground

      Always

      3 MΩ or higher
      Note:

      If the results are out of the specified range, replace the compressor without operating it.

    Result

    Proceed to

    OK

    NG
    OK

    REPLACE COMPRESSOR WITH MOTOR ASSEMBLY

    Click here

    NG

    REPLACE AIR CONDITIONING CYCLE

    Click here