DTC    P0AA6-611    Hybrid Battery Voltage System Isolation Fault

for Preparation Click here


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 w/ motor compressor 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.

NOTICE:
  1. 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.
  2. 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 ration amount.
  3. 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.

CAUTION:
  1. Wear insulated gloves and pull out the service plug grip before inspection as procedures may require disconnecting high-voltage connectors.
  2. Be sure to carry the removed service plug grip because other workers may install it by mistake.
  3. Do not touch the high-voltage connectors or terminals for 5 minutes after the service plug grip is removed.


DTC No.
DTC Detecting condition
Trouble Area
P0AA6-611
High voltage system insulation malfunction
  1. Compressor oil
  2. w/ Motor compressor assembly

WIRING DIAGRAM


E109280E03


INSPECTION PROCEDURE

1.INSPECT COMPRESSOR OIL (ND-OIL 11)

  1. Check if any compressor oil other than ND-OIL 11 has been used before.

    OK:
    Any compressor oil other than ND-OIL 11 has not been used before.



NG
REPLACE AIR CONDITIONING CYCLE
OK


2.INSPECT W/MOTOR COMPRESSOR ASSEMBLY

  1. Clear the DTC (Click here).

  1. Turn the ignition switch ON.

  1. Prepare the vehicle according to the table below.
    Item
    		Condition
    Blower speed
    		HI
    Temperature setting
    		MAX COLD
    A/C
    		ON

  1. Turn the ignition switch off.

  1. Remove the service plug grip.

    CAUTION:
    1. Because the compressor has a high-voltage circuit, wear the insulated gloves and pull out the service plug grip to cut the high-voltage circuit before inspection.
    2. Do not touch the high-voltage connectors or terminals for 5 minutes after the service plug grip is removed.

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



    E109283E03

  1. Disconnect the connector from the w/ motor compressor assembly (C19).

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

    Resistance:
    Tester connection
    		Condition
    		Specified condition
    C19-1 (PGND) - Body ground
    		Always
    		2 MΩ or higher
    C19-2 (PBAT) - Body ground
    		Always
    		2 MΩ or higher



NG
REPLACE W/MOTOR COMPRESSOR ASSEMBLY
OK


3.INSPECT W/MOTOR COMPRESSOR ASSEMBLY

  1. Reconnect the connector to the w/ motor compressor assembly (C19).

  1. Install the service plug grip.

  1. Turn the ignition switch ON.

  1. Set the A/C 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 as possible.

  1. Turn the ignition switch off.

  1. Using a spot cooler or other tools, cool down the w/ motor compressor assembly for 30 minutes, or leave the vehicle overnight before inspection.

    NOTICE:
    Do not operate the compressor before inspection.

  1. Remove the service plug grip.

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



    E109283E03

  1. Disconnect the connector from the w/ motor compressor assembly (C19).

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

    Resistance:
    Tester connection
    (Symbols)
    		Condition
    		Specified condition
    C19-1 (PGND) - Body ground
    		Always
    		3 MΩ or higher
    C19-2 (PBAT) - Body ground
    		Always
    		3 MΩ or higher

    NOTICE:
    If the results are out of the specified range, replace the compressor.



NG
REPLACE AIR CONDITIONING CYCLE
OK

REPLACE W/MOTOR COMPRESSOR ASSEMBLY