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Home >> Toyota >> 2011 >> Camry Base, Standard >> Repair and Diagnosis >> External Pages >> Different variant/trim >> Section 67 (Hybrid Vehicle Control System (P311) (Hybrid) (Diagnostic Codes (P0343-747 - P0A78-282)) >> Hybrid Control System >> DTC P0A09-591: DC / DC Converter Status Circuit Low Input >> Procedure

DTC P0A09-591: DC / DC Converter Status Circuit Low Input: Procedure

WARNING: This page is about a different variant/trim than selected.
  1. CHECK DTC OUTPUT (HV) 
    1. Connect the Techstream to the DLC3.
    2. Turn the power switch on (IG).
    3. Select the following menu items: Powertrain / Hybrid Control / Trouble Codes.
    4. Check if DTCs are output.

      Result

      DTC P0AE6-225 is also output.

    YES → GO TO  INSPECTION PROCEDURE  INSPECTION PROCEDURE RELEVANT TO OUTPUT DTC (P0AE6-225) 

    NO: Go to next step 

  2. CHECK CONNECTOR CONNECTION CONDITION (HYBRID VEHICLE CONTROL ECU CONNECTOR) See step   3 

    NG → CONNECT SECURELY 

    OK: Go to next step 

  3. CHECK CONNECTOR CONNECTION CONDITION (BATTERY PACK WIRE CONNECTOR) 
    1. Check the connection of the battery pack wire connector.
      Fig 1: Identifying On1 Battery Pack Wire Connector Location
      GTY180714Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

      OK

      The connector is connected securely and there are no contact problems.

      HINT: 

      For the removal and installation procedures related to inspection of the connection of the battery pack wire connector. Refer to REMOVAL .

    NG → CONNECT SECURELY 

    OK: Go to next step 

  4. CHECK HYBRID VEHICLE CONTROL ECU 
    1. Connect an oscilloscope between the battery pack wire terminals specified in the table below, and measure the waveform.
      Fig 2: Identifying Battery Pack Wire Connector Terminal Identification And Signal Waveform
      GTY175848Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      Item Contents
      Terminal VLO (On1-7) - GND (On1-10)
      Equipment Setting 5 V/DIV, 50 ms./DIV
      Condition Power switch on (IG)

      HINT: 

      Perform this inspection with the battery pack wire connected.

    OK → See step   9 

    NG: Go to next step 

  5. CHECK HARNESS AND CONNECTOR (RESISTANCE VALUE INSIDE HYBRID VEHICLE CONTROL ECU) 
    1. Disconnect the battery pack wire connector.
      Fig 3: Identifying On1 Battery Pack Wire Connector Location
      GTY180714Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    2. Measure the resistance according to the value(s) in the table below.
      Fig 4: Identifying On1 Battery Pack Wire Connector Terminal Identification
      GTY172704Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

      Standard resistance

      Tester Connection Specified Condition
      VLO (On1-7) - Body ground 370 to 430 kΩ

    NG → See step   8 

    OK: Go to next step 

  6. CHECK CONNECTOR CONNECTION CONDITION (HYBRID VEHICLE CONVERTER CONNECTOR) 
    WARNING:

    Be sure to wear insulated gloves.

    1. Check that the service plug grip is not installed.
      Fig 5: Identifying N4 Hybrid Vehicle Converter Connector
      GTY192886Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    2. Check the connection of the hybrid vehicle converter (DC/DC converter) connector.

      OK

      The connector is connected securely and there are no contact problems.

    NG → CONNECT SECURELY 

    OK: Go to next step 

  7. CHECK HARNESS AND CONNECTOR (BATTERY PACK WIRE CONNECTOR - HYBRID VEHICLE CONVERTER) 
    WARNING:

    Be sure to wear insulated gloves.

    1. Check that the service plug grip is not installed.
    2. Disconnect the n4 hybrid vehicle converter (DC/DC converter) connector. Refer to REMOVAL .
    3. Measure the resistance according to the value(s) in the table below.
      Fig 6: Disconnecting N4 Hybrid Vehicle Converter (DC/DC Converter) Connector Terminal Identification
      GTY192889Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

      Standard resistance (Check for open)

      Tester Connection Specified Condition
      VLO (On1-7) - VLO (n4-3) Below 1 Ω

      Standard resistance (Check for short)

      Tester Connection Specified Condition
      VLO (On1-7) or VLO (n4-3) - Body ground 10 kΩ or more

    NG → REPAIR OR REPLACE HARNESS OR CONNECTOR 

    OK → See step   12 

  8. CHECK HARNESS AND CONNECTOR (HYBRID VEHICLE CONTROL ECU - BATTERY PACK WIRE CONNECTOR) 
    1. Disconnect the A61 hybrid vehicle control ECU connector.
    2. Measure the resistance according to the value(s) in the table below.
      Fig 7: Identifying A61 Hybrid Vehicle Control ECU And On1 Battery Pack Wire Connector Terminal Identification
      GTY192867Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

      Standard resistance (Check for open)

      Tester Connection Specified Condition
      VLO (A61-53) - VLO (On1-7) Below 1 Ω

      Standard resistance (Check for short)

      Tester Connection Specified Condition
      VLO (A61-53) or VLO (On1-7) - Body ground 10 kΩ or more

    NG → REPAIR OR REPLACE HARNESS OR CONNECTOR 

    OK → See step   13 

  9. CLEAR DTC 
    1. Connect the Techstream to the DLC3.
    2. Turn the power switch on (IG).
    3. Read and record the DTCs and freeze frame data.
    4. Select the following menu items: Powertrain / Hybrid Control / Trouble Codes.
    5. Clear DTCs and freeze frame data.

    NEXT: Go to next step 

  10. RECONFIRM DTC OUTPUT (HV) 
    1. Connect the Techstream to the DLC3.
    2. Turn the power switch on (IG).
    3. Select the following menu items: Powertrain / Hybrid Control / Trouble Codes.
    4. Check if DTCs are output.

      Result

      DTC P0A09-591 is output.

    5. Clear the DTCs.

    YES → See step   13 

    NO: Go to next step 

  11. CHECK FOR INTERMITTENT PROBLEMS 
    1. Check for intermittent problems. Refer to CHECK FOR INTERMITTENT PROBLEMS .

    NG → REPAIR OR REPLACE MALFUNCTIONING PARTS, COMPONENT AND AREA 

    OK → See step   13 

  12. REPLACE HYBRID VEHICLE CONVERTER. Refer to  REMOVAL 
  13. REPLACE HYBRID VEHICLE CONTROL ECU. Refer to  REMOVAL 
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