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Home >> Lexus >> 2008 >> RX 400h AWD >> Repair and Diagnosis >> External Pages >> Different car >> Section 158 (Hybrid Vehicle Control (P310) - RX400H - DTC P0336-137 Through P0A32-666) >> DTC P0A09-265 DC / DC Converter Status Circuit Low Input; DTC P0A10-263 DC / DC Converter Status Circuit High Input >> Inspection Procedure

Inspection Procedure

WARNING: This page is about a different car, the 2006 Lexus RX 400h. However, it is still accessible from the selected car via links, so may be relevant.
CAUTION:
  • 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.
  • 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 CONNECTION CONDITION OF MG ECU CONNECTOR (LOOSENESS AND POOR CONTACT) 
    CAUTION:

    Be sure to wear insulated gloves.

    1. Turn the ignition switch off and remove the service plug grip. (See PRECAUTION )
      NOTE: Do not put the vehicle into the READY-on state with the service plug grip removed as this may cause a malfunction.
    2. Remove the inverter cover. (See INVERTER WITH CONVERTER )
      NOTE:
      • Wrap the interlock round terminal for the inverter cover with vinyl tape to prevent it from shorting to ground.
      • Prevent water in the reservoir tank from entering the inverter.

        Removing the inverter cover causes the MG ECU board to be exposed. Therefore, temporarily install the inverter cover for each area to be inspected.

    3. Check the connections of the MG ECU connectors.

      OK: 

      Connectors are connected securely and there is no poor connection. 

    Fig 1: Checking Connection Condition Of MG ECU Connector (Looseness And Poor Contact)
    G04111930Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

    NG: CONNECT SECURELY 

    OK: GO TO NEXT STEP 

  2. CHECK HARNESS AND CONNECTOR (HV CONTROL ECU - MG ECU) 
    CAUTION:

    Be sure to wear insulated gloves.

    1. Check that the service plug grip is removed.
    2. Disconnect the H34 connector from the HV control ECU.
    3. Disconnect the I21 connector from the MG ECU.
    4. Measure the voltage according to the value(s) in the table below when the ignition switch is in the ON position.
      NOTE: Turning the ignition switch to the ON position with the MG ECU connectors disconnected causes other DTCs to be stored. Clear the DTCs after performing the inspection.

      Standard Voltage 

      HV CONTROL ECU - MG ECU (VOLTAGE)

      Tester Connection Specified Condition
      NODD (H34-11) - Body ground Below 1 V
    5. Turn the ignition switch off.
    6. Measure the resistance according to the value(s) in the table below.

      Standard Resistance (Check for open) 

      HV CONTROL ECU - MG ECU (CHECK FOR OPEN)

      Tester Connection Specified Condition
      NODD (H34-11) - NODD (I21-33) Below 1 Ω

      Standard Resistance (Check for short) 

      HV CONTROL ECU - MG ECU (CHECK FOR SHORT)

      Tester Connection Specified Condition
      NODD (H34-11) or NODD (I21-33) - Body ground 10 kΩ or more
      Fig 2: Checking Harness And Connector (HV Control ECU - MG ECU)
      G04111931Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

    NG: REPAIR OR REPLACE HARNESS OR CONNECTOR 

    OK: REPLACE W/ CONVERTER INVERTER ASSEMBLY 

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