AIR CONDITIONING SYSTEM, Diagnostic DTC:P0AA6-611

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

DESCRIPTION

The DTC is output if there is insulation trouble with the high-voltage circuits 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.

The motor driven with high-voltage is built into the electrical compressor 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.

Note


  • 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 the DTC to be output.

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

  • Replace the main components (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 the DTC to be output.

DTC No. DTC Detection Condition Trouble Area
P0AA6-611 High voltage system insulation malfunction

  • Compressor oil

  • Air conditioning cycle

  • Compressor with motor assembly

  • CAN communication system

WIRING DIAGRAM

A01GWR8E04

INSPECTION PROCEDURE

CAUTION:


  • When troubleshooting P0AA6-611, be sure to wrap tools with electrical tape. (It is very dangerous if high voltage is shorted to ground through tools.)

  • Wear insulated gloves and pull out the service plug grip before inspection as procedures may require disconnecting high-voltage connectors.

  • Be sure to carry the removed service plug grip because other workers may install it by mistake.

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

Note

The hybrid control system and air conditioning system output DTCs separately. Inspect DTCs following the flowchart for the hybrid control system first if any DTCs from those systems are output simultaneously.

Tech Tips


  • Waiting for at least 10 minutes is required to discharge the high-voltage capacitor inside the inverter with converter assembly.

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

  • When measuring insulation resistance using a megohmmeter, measure the resistance while jiggling the high-voltage wire harness.

  • When measuring insulation resistance using a megohmmeter, set the megohmmeter to 500 V.

PROCEDURE


  1. CHECK DTC (CAN COMMUNICATION SYSTEM)


    1. Check if DTCs for the CAN communication system are output using the intelligent tester.


      Result
      Result Proceed to
      DTC is not output A
      DTC is output (for LHD) B
      DTC is output (for RHD) C

    B

    GO TO CAN COMMUNICATION SYSTEM Click here

    C

    GO TO CAN COMMUNICATION SYSTEM Click here

    A

  2. INSPECT COMPRESSOR WITH MOTOR ASSEMBLY

    CAUTION:

    Be sure to wear insulated gloves.


    1. Turn the power switch to on (READY).

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

      Item Condition
      Blower speed HI
      Temperature setting MAX COLD
      A/C switch ON

    3. Turn the power switch off.

    4. Remove the service plug grip Click here.

      CAUTION:


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

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

      Note

      Do not start the engine with the service plug grip removed because it may cause a malfunction.

    5. A01GYGFE01

      Disconnect the k2 compressor with motor assembly connector.

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

      Note

      Be sure to set the megohmmeter to 500 V when performing this test. Using a setting higher than 500 V can result in damage to the component being inspected.

      Standard resistance
      Tester Connection Condition Specified Condition
      1 (PE) - Body ground Always 2 MΩ or higher
      2 (PB) - Body ground

    NG

    REPLACE COMPRESSOR WITH MOTOR ASSEMBLY Click here

    OK

  3. CHECK AIR CONDITIONING CYCLE

    CAUTION:

    Be sure to wear insulated gloves.


    1. Reconnect the k2 compressor with motor assembly connector.

    2. Install the service plug grip Click here.

    3. Turn the power switch to on (READY).

    4. Set the air conditioning setting temperature to 25°C (77°F) and the blower switch LO and then operate the compressor for 10 minutes to circulate the refrigerant cycle with refrigerant and collect as much compressor oil as possible.

    5. Turn the power switch off.

    6. Using a spot cooler or other tools, 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

      Do not start the engine with the service plug grip removed because it may cause a malfunction.

    8. A01GYGFE01

      Disconnect the k2 compressor with motor assembly connector.

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

      Note

      Be sure to set the megohmmeter to 500 V when performing this test. Using a setting higher than 500 V can result in damage to the component being inspected.

      Standard resistance
      Tester Connection Condition Specified Condition
      1 (PE) - Body ground Always 3 MΩ or higher
      2 (PB) - Body ground

      Note

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


    NG

    REPLACE AIR CONDITIONING CYCLE

    OK

    REPLACE COMPRESSOR WITH MOTOR ASSEMBLY Click here