Hybrid Vehicle Control System

DTC P0AA6-611 Hybrid Battery Voltage System Isolation Fault

DESCRIPTION

DTC Detection Condition:

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 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.

CAUTION:
- 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:
- 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.
- Replace the air conditioning cycle* 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 refrigerant components of the air conditioning system (Evaporator, condenser, compressor assembly, refrigerant pipe line)

HINT: This circuit uses both CAN and multiplex communication. Before performing the inspection, check that the CAN and multiplex communication systems are functioning normally.

Wiring Diagram:

Step 1:

Step 1 (Continued)-2:

Step 2 (Continued):

INSPECTION PROCEDURE

HINT: 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.