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 trouble with 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 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.

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. DTC Detection Condition Trouble Area
P0AA6-611 High voltage system insulation malfunction

  • Compressor oil

  • Refrigerant pipe line

  • Compressor with motor assembly

  • CAN communication system

WIRING DIAGRAM

A004FVVE41

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 ignition 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 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 the 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 as possible 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.

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

Tech Tips

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. Use the GTS to check if the CAN communication system is functioning normally.

      OK
      CAN DTC is not output
      Result
      Result Proceed to
      OK A
      NG*1 B
      NG*2 C

      • *1: w/ Toyota Safety Sense

      • *2: w/o Toyota Safety Sense


    B

    GO TO CAN COMMUNICATION SYSTEM (w/ Toyota Safety Sense) Click here

    C

    GO TO CAN COMMUNICATION SYSTEM (w/o Toyota Safety Sense) Click here

    A

  2. INSPECT COMPRESSOR WITH MOTOR ASSEMBLY

    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.


    1. Clear the DTCs Click here.

    2. Turn the ignition switch to 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 ON

    4. Turn the ignition switch off.

    5. 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 ignition switch to ON (READY) may cause a malfunction. Do not turn the ignition switch to ON (READY) with the service plug grip removed.

    6. A004FIDE02
      Text in Illustration
      *a

      Component without harness connected

      (Compressor with Motor Assembly)

      Disconnect the D1 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
      D1-1 (PE) - Body ground Always 2 MΩ or higher
      D1-2 (PB) - Body ground Always 2 MΩ or higher

    NG

    REPLACE COMPRESSOR WITH MOTOR ASSEMBLY Click here

    OK

  3. INSPECT AIR CONDITIONING CYCLE

    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.


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

    2. Install the service plug grip Click here.

    3. Turn the ignition switch to ON (READY).

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

    5. Turn the ignition 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

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

    8. A004FIDE02
      Text in Illustration
      *a

      Component without harness connected

      (Compressor with Motor Assembly)

      Disconnect the D1 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
      D1-1 (PE) - Body ground Always 3 MΩ or higher
      D1-2 (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
      Result Proceed to
      OK A
      NG*1 B
      NG*2 C

      • *1: for HFC-134a(R134a)

      • *2: for HFO-1234yf(R1234yf)


    A

    REPLACE COMPRESSOR WITH MOTOR ASSEMBLY Click here

    B

    REPLACE AIR CONDITIONING CYCLE Click here

    C

    REPLACE AIR CONDITIONING CYCLE Click here