Diesel Data: Automotive Repair
Home >> Toyota >> 2009 >> Prius L4-1.5L (1NZ-FXE) Hybrid >> Repair and Diagnosis >> A L L Diagnostic Trouble Codes ( DTC ) >> Testing and Inspection >> P Code Charts >> P0AA6 >> P0AA6-611 >> Air Conditioning System

Air Conditioning System








AIR CONDITIONING: AIR CONDITIONING SYSTEM: P0AA6-611: Hybrid Battery Voltage System Isolation Fault

DTC 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. Insulation trouble with the electric inverter compressor or A/C inverter may be the cause. Any oil other than ND-OIL 11 may have entered the refrigeration 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:
- Electrical insulation performance may decrease significantly if even a small amount of oil other than ND-OIL 11 is used or enters the refrigeration cycle, causing the DTC to be output.
- If other oil is accidentally used and a DTC is output, collect the oil in the refrigeration 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.
CAUTION: Wear insulated gloves and pull out the service plug grip before inspection as procedures may require disconnecting high-voltage connectors.





NOTE: The A/C inverter is integrated with the inverter with converter. It is necessary to replace the PCU box if the A/C inverter (inverter with converter) needs to be replaced because the A/C inverter (inverter with converter) cannot be replaced alone.

PROCEDURE

1. CHECK A/C INVERTER




(a) Remove the service plug grip.
CAUTION: Because the compressor has a high-voltage circuit, wear insulated gloves and pull out the service plug to cut the high-voltage circuit before inspection.
(b) Disconnect the C4 inverter connector.
(c) Measure the resistance of the wire harness side connector immediately after the compressor is stopped.
Standard resistance:






NG -- REPLACE A/C INVERTER
OK -- Continue to next step.

2. CHECK ELECTRIC INVERTER COMPRESSOR




(a) Remove the service plug grip.
CAUTION: Because the compressor has a high-voltage circuit, wear insulated gloves and pull out the service plug to cut the high-voltage circuit before inspection.
(b) Disconnect the C4 compressor connector.
(c) Measure the resistance of the connector.
Standard resistance:






NG -- REPLACE ELECTRIC INVERTER COMPRESSOR
OK -- Continue to next step.

3. CHECK ELECTRIC INVERTER COMPRESSOR
(a) Connect the electric inverter compressor connector.
(b) Install the service plug grip.
CAUTION: Because the compressor has a high-voltage circuit, wear insulated gloves and pull out the service plug to cut the high-voltage circuit before inspection.
(c) Turn the power switch ON (IG).
(d) Set the A/C setting temperature to 25°C (77°F) and the blower switch LO. Then operate the compressor for 10 minutes to circulate the refrigerant cycle with refrigerant and collect as much compressor oil remaining in each component into the compressor as possible.
HINT: Inspect with sufficient oil in the compressor since the insulation resistance of the compressor changes depending on the amount of oil in the compressor.
(e) Turn the power switch OFF, and leave the vehicle for a night to cool down the compressor's internal temperature.
NOTE: Do not operate the compressor before inspection.
HINT:
- Leave the vehicle until the compressor temperature decreases below ambient temperature. (As the compressor temperature decreases below the temperature of the condenser and evaporator, more oil can be stored in the compressor.)
- If there is significant difference in temperature between day and night time, it will take approximately 4 hours to cool down the compressor. Remove the service plug grip.
(f) Remove the service plug grip.
CAUTION: Because the compressor has a high-voltage circuit, wear insulated gloves and pull out the service plug to cut the high-voltage circuit before inspection.
(g) Disconnect the C4 compressor connector.




(h) Measure the resistance of the connector.
Standard resistance:





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

NG -- REPLACE ELECTRIC INVERTER COMPRESSOR
OK -- SYSTEM IS OK
Diesel-Data.com