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Home >> Lexus >> 2020 >> UX 200 Luxury >> Repair and Diagnosis >> External Pages >> Different car >> Section 14 (Hybrid Control System (Diagnostic Codes) (1 Of 5)) >> Hybrid Control System >> DTC P0A1B-94: Drive Motor "A" Control Module Unexpected Operation [10/2018 - ] >> Procedure

DTC P0A1B-94: Drive Motor "A" Control Module Unexpected Operation [10/2018 - ]: Procedure

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  1. CHECK AUXILIARY BATTERY TERMINAL (CONTACT PROBLEM) 
    1. Check the connection of the negative (-) and positive (+) auxiliary battery terminals.

      OK

      The terminals are connected securely and there is no contact problem.

      HINT: 

      If performing a reproduction test, turn the power switch on (IG) and shake the wire harnesses vertically and horizontally before checking for DTCs.

      Result

      Proceed to
      OK
      NG

    Result: 

    NG 

    See step  6

    Result: 

    OK 

    See step  2

  2. CHECK GROUND WIRE CONNECTION CONDITION 
    1. Check the installation condition of the ground wires OA.
      GTY788885Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

      OK

      The ground wires OA are securely installed.

      HINT: 

      If performing a reproduction test, turn the power switch on (IG) and shake the wire harnesses vertically and horizontally before checking for DTCs.

      Result

      Proceed to
      OK
      NG

    Result: 

    NG 

    See step  7

    Result: 

    OK 

    See step  3

  3. CHECK FUSIBLE LINK (IGCT IG) 
    1. Disconnect the cable from the negative (-) auxiliary battery terminal.
    2. Check the fusible link block assembly (IGCT IG) for improper installation.

      OK

      The fusible link block assembly is installed securely and there is no contact problem.

    3. Measure the resistance according to the value(s) in the table below.

      Standard Resistance

      Tester Connection Switch Condition Specified Condition
      A-1 (Fusible Link Block Assembly) - N114-1 (Fusible Link Block Assembly) Power switch off Below 1 Ω
      GTY776895Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      *1 Fusible Link Block Assembly
    4. Reconnect the cable from the negative (-) auxiliary battery terminal.

      Result

      Proceed to
      OK
      NG

    Result: 

    NG 

    See step  8

    Result: 

    OK 

    See step  4

  4. CHECK RELAY (IGCT) 
    1. Check the IGCT relay for improper installation.

      OK

      The relay is installed securely.

      HINT: 

      If performing a reproduction test, turn the power switch on (IG) and gently vibrate the IGCT relay with a finger before checking for DTCs.

    2. Remove the IGCT relay from the No. 3 relay block.
      GTY833325Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      *1 NO. 3 RELAY BLOCK
      *2 IGCT Relay
    3. Measure the resistance according to the value(s) in the table below.
      GTY434306Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      *1 IGCT Relay

      Standard Resistance

      Tester Connection Condition Specified Condition
      3 - 5 Auxiliary battery voltage not applied between terminals 1 and 2 10 kΩ or higher
      Auxiliary battery voltage applied between terminals 1 and 2 Below 1 Ω
    4. Install the IGCT relay.

      Result

      Proceed to
      OK
      NG

    Result: 

    NG 

    See step  9

    Result: 

    OK 

    See step  5

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

      HINT: 

      Check the DTCs that were output when the vehicle was brought to the workshop.

      Powertrain > Hybrid Control > Trouble Codes 

      Result

      Result  Proceed to
      P0A1B94 only is output. A
      DTCs except P0A1B94 are output. B
    5. Turn the power switch off.

    Result: 

    A 

    REFER TO REPLACE INVERTER WITH CONVERTER ASSEMBLY PARTS. Refer to  DTC CHECK / CLEAR [10/2018 - ] 

    Result: 

    B 

    GO TO DTC CHART (HYBRID CONTROL SYSTEM). Refer to  DIAGNOSTIC TROUBLE CODE CHART [10/2018 - ] 

  6. CONNECT SECURELY 

    Result

    Proceed to
    NEXT

    Result: 

    NEXT 

    See step  10

  7. CONNECT SECURELY 

    Result

    Proceed to
    NEXT

    Result: 

    NEXT 

    See step  10

  8. REPAIR OR REPLACE MALFUNCTIONING PARTS 

    Result

    Proceed to
    NEXT

    Result: 

    NEXT 

    See step  10

  9. REPAIR OR REPLACE MALFUNCTIONING PARTS 

    Result

    Proceed to
    NEXT

    Result: 

    NEXT 

    See step  10

  10. CLEAR DTC 

    See step  3

    Result

    Proceed to
    NEXT

    Result: 

    NEXT 

    See step  11

  11. SIMULATION TEST 
    1. Turn the power switch off and wait for 2 minutes or more.
    2. Turn the power switch on (IG) and wait for 2 minutes or more.
    3. Turn the power switch off.

      Result

      Proceed to
      NEXT

    Result: 

    NEXT 

    See step  12

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

      Powertrain > Hybrid Control > Trouble Codes 

      Result

      Result Proceed to
      No DTCs are output. A
      P0A1B94 only is output. B
      DTCs except P0A1B94 are output. C
    5. Turn the power switch off.

    Result: 

    A 

    END 

    Result: 

    B 

    REFER TO REPLACE INVERTER WITH CONVERTER ASSEMBLY PARTS. Refer to  DTC CHECK / CLEAR [10/2018 - ] 

    Result: 

    C 

    GO TO DTC CHART (HYBRID CONTROL SYSTEM). Refer to  DIAGNOSTIC TROUBLE CODE CHART [10/2018 - ] 

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