RX400h · Service Manual HYBRID SYSTEM

P3226-562

Diagnostic trouble codes

DESCRIPTION

The MG ECU located in the w/ converter inverter assembly uses the temperature sensor that is built into the w/ converter inverter assembly to detect the boost converter temperature. The inverter cooling system is the same as that for the Motor or Generator, and operates independently of the engine cooling system. The MG ECU limits the load based on signals sent from the boost converter temperature sensor in order to check the effect of the inverter cooling system and prevent overheating. The ECU also detects malfunctions in the boost converter temperature sensor.
DTC No.
 INF Code
 DTC Detection Condition
 Trouble Area
P3226
 562
 Sudden change in boost converter temperature sensor output
  1. Inverter cooling system
  2. Water pump w/ motor & bracket assembly
  3. w/ converter inverter assembly (MG ECU)
↑
 563
 Boost converter temperature sensor output deviation
  1. Inverter cooling system
  2. Water pump w/ motor & bracket assembly
  3. w/ converter inverter assembly (MG ECU)

INSPECTION PROCEDURE

CAUTION:
  1. Before inspecting the high-voltage system, take safety precautions to prevent electrical shocks, such as wearing insulated gloves and removing the service plug grip. After removing the service plug grip, put it in your pocket to prevent other technicians from reconnecting it while you are working on the high-voltage system.
  2. After disconnecting the service plug grip, wait for at least 5 minutes before touching any of the high-voltage connectors or terminals.

HINT:
At least 5 minutes is required to discharge the high-voltage capacitor inside the w/ converter inverter assembly.


1. CHECK QUANTITY OF HV COOLANT

  1. Check the inverter coolant level.

    OK:
    There is sufficient amount of coolant for the inverter.



 NG
CHECK FOR COOLANT LEAKS AND ADD COOLANT
OK


2. CHECK COOLANT HOSE

  1. A105138E02
    Check that the hoses of the cooling system are not bent or clogged.

    OK:
    The hoses of the cooling system are not bent or clogged.



 NG
CORRECT TO NORMAL CONDITION
OK


3. CHECK CONNECTION CONDITION OF WATER PUMP CONNECTOR (LOOSENESS AND POOR CONTACT)

  1. A108018E01
    Check the connection of the water pump w/ motor & bracket assembly connector.

    OK:
    Connector is connected securely and there is no poor connection.



 NG
CONNECT SECURELY
OK


4. PERFORM ACTIVE TEST BY INTELLIGENT TESTER (WATER PUMP)

  1. Connect the intelligent tester to the DLC3.

  1. Turn the ignition switch to the ON position.

  1. Select the following menu items: Powertrain / Hybrid Control / Active Test / Active Water Pump.

  1. During the water pump active test, check operation of the water pump.

    OK:
    There are ripples in the reservoir tank coolant.

    HINT:
    The water pump is also activated in the READY-on state.



 NG
CHECK WATER PUMP W/ MOTOR & BRACKET ASSEMBLY CIRCUIT
OK


5. CHECK CONNECTION CONDITION OF COOLING FAN CONNECTOR (LOOSENESS AND POOR CONTACT)

  1. Check the connection of the electric cooling fan connector.

    OK:
    Connector is connected securely and there is no poor connection.



 NG
CONNECT SECURELY
OK


6. PERFORM ACTIVE TEST BY INTELLIGENT TESTER (COOLING FAN)

  1. Connect the intelligent tester to the DLC3.

  1. Turn the ignition switch to the ON position.

  1. Select the following menu items: Powertrain / Engine / Active Test / Cooling Fan.

  1. Perform the cooling fan active test.

    OK:
    The electric cooling fan rotates.



 NG
CHECK COOLING FAN CIRCUIT
OK


7. CHECK CONNECTION CONDITION OF MG ECU CONNECTOR (LOOSENESS AND POOR CONTACT)

CAUTION:
Be sure to wear insulated gloves.

  1. A103665E01
    Turn the ignition switch off and remove the service plug grip. (Click here)

    NOTICE:
    Do not put the vehicle into the READY-on state with the service plug grip removed as this may cause a malfunction.

  1. Remove the inverter cover. (Click here)

    NOTICE:
    1. Wrap the interlock round terminal for the inverter cover with vinyl tape to prevent it from shorting to ground.
    2. Be sure to prevent water in the reservoir tank from entering the inverter.
    3. Removing the inverter cover causes the MG ECU board to be exposed. Therefore, temporarily install the inverter cover for each area to be inspected.

  1. Check the connections of the MG ECU connectors.

    OK:
    Connectors are connected securely and there is no poor connection.



 NG
CONNECT SECURELY
OK

REPLACE W/ CONVERTER INVERTER ASSEMBLY


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