LEMON Manuals: Even more car manuals for everyone
Home >> Toyota >> 2016 >> Highlander Hybrid Limited >> Repair and Diagnosis >> External Pages >> Different car >> Section 76 (Hybrid Control System (2GR-FXS) - Diagnostic Codes (2 Of 6)) >> Hybrid Control System >> DTC P0A09-591: DC / DC Converter Status Circuit Low Input [11/2016 - ] >> Procedure

DTC P0A09-591: DC / DC Converter Status Circuit Low Input [11/2016 - ]: Procedure

WARNING: This page is about a different car, the 2019 Toyota Highlander, 2018 Toyota Highlander, and 2017 Toyota Highlander. However, it is still accessible from the selected car via links, so may be relevant.
  1. CHECK CONNECTOR CONNECTION CONDITION (HYBRID VEHICLE CONTROL ECU ASSEMBLY CONNECTOR) 

    See step  1

    Result

    Proceed to
    OK
    NG

    Result:  3

    NG 

    CONNECT SECURELY 

    Result:  1

    OK 

    See step  2

  2. CHECK CONNECTOR CONNECTION CONDITION (INVERTER WITH CONVERTER ASSEMBLY CONNECTOR) 

    See step  3

    Result

    Result Proceed to
    OK A
    NG (The connector is not connected securely.) B
    NG (The terminals are not making secure contact or are deformed, or water or foreign matter exists in the connector.) C

    Result:  2

    B 

    CONNECT SECURELY 

    Result:  3

    C 

    REPAIR OR REPLACE HARNESS OR CONNECTOR 

    Result:  1

    A 

    See step  3

  3. CHECK HYBRID VEHICLE CONTROL ECU ASSEMBLY (CHECK WAVEFORM) 
    1. Connect an oscilloscope between the hybrid vehicle control ECU assembly terminals specified in the table below.
    2. Turn the power switch on (IG).
    3. Measure the waveform.
      GTY688759Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      *a Component with harness connected
      (Hybrid Vehicle Control ECU Assembly)
      Item Content
      Terminal A85-16 (VLO) - F136-6 (E1)
      Equipment Setting 5 V/DIV., 50 ms./DIV.
      Condition Power switch on (IG)

      OK

      The waveform appears as shown in the illustration.

      HINT: 

      • Perform this inspection with the hybrid vehicle control ECU assembly connector connected.
      • The waveform varies depending on the specified DC/DC converter voltage.
    4. Turn the power switch off.

      Result

      Proceed to
      OK
      NG

    Result:  2

    NG 

    See step  6

    Result:  1

    OK 

    See step  4

  4. CLEAR DTC 

    See step  3

    Result

    Proceed to
    NEXT

    Result:  1

    NEXT 

    See step  5

  5. CHECK DTC OUTPUT (HYBRID CONTROL) 
    1. Connect the Techstream to the DLC3.
    2. Turn the power switch on (READY).
    3. Enter the following menus: Powertrain / Hybrid Control / Trouble Codes.
    4. Check for DTCs.

      Powertrain > Hybrid Control > Trouble Codes 

      Result

      Result Proceed to
      P0A09-591 is not output. A
      P0A09-591 is output again. B
    5. Turn the power switch off.

    Result:  1

    A 

    CHECK FOR INTERMITTENT PROBLEMS. Refer to  CHECK FOR INTERMITTENT PROBLEMS [02/2014 - ] 

    Result:  2

    B 

    REPLACE HYBRID VEHICLE CONTROL ECU ASSEMBLY. Refer to  COMPONENTS [11/2016 - ] 

  6. CHECK HARNESS AND CONNECTOR (RESISTANCE VALUE OF VLO INSIDE HYBRID VEHICLE CONTROL ECU ASSEMBLY) 
    WARNING:

    Be sure to wear insulated gloves.

    1. Check that the service plug grip is not installed.
      NOTE:

      After removing the service plug grip, do not turn the power switch on (READY), unless instructed by the repair information because this may cause a malfunction.

    2. Disconnect the A46 inverter with converter assembly connector.
    3. Measure the resistance according to the value(s) in the table below.

      Standard Resistance

      Tester Connection Condition Specified Condition
      A46-4 (VLO) - Body ground Power switch off 370 to 430 kΩ
      GTY448191Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      *a Front view of wire harness connector
      (to Inverter with Converter Assembly)
    4. Reconnect the A46 inverter with converter assembly connector.

      Result

      Proceed to
      OK
      NG

    Result:  1

    OK 

    REPLACE INVERTER WITH CONVERTER ASSEMBLY. Refer to  COMPONENTS [11/2016 - ] 

    Result:  2

    NG 

    See step  7

  7. CHECK HARNESS AND CONNECTOR (INVERTER WITH CONVERTER ASSEMBLY - HYBRID VEHICLE CONTROL ECU ASSEMBLY) 
    WARNING:

    Be sure to wear insulated gloves.

    1. Check that the service plug grip is not installed.
      NOTE:

      After removing the service plug grip, do not turn the power switch on (READY), unless instructed by the repair information because this may cause a malfunction.

    2. Disconnect the A46 inverter with converter assembly connector.
    3. Disconnect the A85 hybrid vehicle control ECU assembly connector.
    4. Measure the resistance according to the value(s) in the table below.

      Standard Resistance

      Tester Connection Condition Specified Condition
      A46-4 (VLO) - A85-16 (VLO) Power switch off Below 1 Ω
      A46-4 (VLO) or A85-16 (VLO) - Body ground and other terminals Power switch off 10 kΩ or higher
      GTY709838Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      *a Front view of wire harness connector
      (to Inverter with Converter Assembly)
      *b Rear view of wire harness connector
      (to Hybrid Vehicle Control ECU Assembly)
    5. Reconnect the A85 hybrid vehicle control ECU assembly connector.
    6. Reconnect the A46 inverter with converter assembly connector.

      Result

      Proceed to
      OK
      NG

    Result:  1

    OK 

    REPLACE HYBRID VEHICLE CONTROL ECU ASSEMBLY. Refer to  COMPONENTS [11/2016 - ] 

    Result:  2

    NG 

    REPAIR OR REPLACE HARNESS OR CONNECTOR 

scientia non olet · About LEMON Manuals