HYBRID CONTROL SYSTEM, Diagnostic DTC:P0A1B94

DTC Code DTC Name
P0A1B94 Drive Motor "A" Control Module Unexpected Operation

DTC SUMMARY


  1. MALFUNCTION DESCRIPTION

    The hybrid vehicle control ECU monitors the motor generator control ECU (MG ECU).

    The cause of this malfunction may be the following:


      Motor generator control ECU internal malfunction

    • Motor generator control ECU (MG ECU) malfunction

DESCRIPTION

The hybrid vehicle control ECU monitors the motor generator control ECU (MG ECU) and stores this DTC when it detects a malfunction.

DTC No. Detection Item DTC Detection Condition Trouble Area MIL Warning Indicate
P0A1B94 Drive Motor "A" Control Module Unexpected Operation

The motor generator control ECU (MG ECU) value received by the hybrid vehicle control ECU exceeds the threshold for a certain period of time.

(1 trip detection logic)

  • Inverter with Converter Assembly

  • Fusible link block assembly (BATT-MAIN)

  • IGCT-IG fuse

  • IGCT relay

 Comes on

Master Warning Light:

Comes on

CONFIRMATION DRIVING PATTERN

Tech Tips

After repair has been completed, clear the DTC and then check that the vehicle has returned to normal by performing the following All Readiness check procedure.

Click here


  1. Connect the GTS to the DLC3.

  2. Turn the power switch on (IG) and turn the GTS on.

  3. Clear the DTCs (even if no DTCs are stored, perform the clear DTC procedure).

  4. Turn the power switch off and wait for 2 minutes or more.

  5. Turn the power switch on (IG) and turn the GTS on.

  6. With power switch on (IG) and wait for 2 minutes or more.

    Tech Tips

    If the vehicle has returned to normal, it can be driven after turning the power switch on (READY).

  7. Enter the following menus: Powertrain / Hybrid Control / Utility / All Readiness.

  8. Check the DTC judgment result.

    Tech Tips


    • If the judgment result shows NORMAL, the system is normal.

    • If the judgment result shows ABNORMAL, the system has a malfunction.

    • If the judgment result shows INCOMPLETE or N/A, perform driving pattern again.

WIRING DIAGRAM

A005NBPE01

PROCEDURE


  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.

      Tech Tips

      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

    NG

    CONNECT SECURELY Click here

    OK

  2. CHECK GROUND WIRE CONNECTION CONDITION


    1. Check the installation condition of the ground wires DA and DC.

      A005NC5N01
      OK
      The ground wires DA and DC are securely installed.

      Tech Tips

      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

    NG

    CONNECT SECURELY Click here

    OK

  3. CHECK FUSIBLE LINK (BATT-MAIN)


    1. Disconnect the cable from the negative (-) auxiliary battery terminal.

    2. Disconnect the cable from the positive (+) auxiliary battery terminal.

    3. Check the fusible link block assembly (BATT-MAIN) for improper installation.

      OK
      The fusible link block assembly is installed securely and there is no contact problem.
    4. A005MVAC05
      *1 Fusible Link Block Assembly

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      A71-1 - A-1 (Positive (+) auxiliary battery terminal) Power switch off Below 1 Ω

    5. Reconnect the cable from the positive (+) auxiliary battery terminal.

    6. Reconnect the cable from the negative (-) auxiliary battery terminal.

      Result
      Proceed to
      OK
      NG

    NG

    REPAIR OR REPLACE MALFUNCTIONING PARTS Click here

    OK

  4. CHECK FUSE (IGCT-IG)


    1. Check the IGCT-IG fuse for improper installation.

      OK
      The fuse is installed securely.

      Tech Tips

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

    2. A005MTKC01
      *1 No. 1 Engine Room Relay Block
      *2 IGCT-IG Fuse

      Remove the IGCT-IG fuse from the No. 1 engine room relay block.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      IGCT-IG fuse Power switch off Below 1 Ω

    4. Install the IGCT-IG fuse to the No. 1 engine room relay block.

      Result
      Proceed to
      OK
      NG

    NG

    REPAIR OR REPLACE MALFUNCTIONING PARTS Click here

    OK

  5. CHECK RELAY (IGCT)


    1. Check the IGCT relay for improper installation.

      OK
      The relay is installed securely.

      Tech Tips

      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. A005NYZC01
      *1 No. 1 Engine Room Relay Block
      *2 IGCT Relay

      Remove the IGCT relay from the No. 1 engine room relay block.

    3. A005NORC19
      *1 IGCT Relay

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

      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

    NG

    REPAIR OR REPLACE MALFUNCTIONING PARTS Click here

    OK

  6. CHECK DTC OUTPUT (HYBRID CONTROL)


    1. Connect the GTS to the DLC3.

    2. Turn the power switch on (IG).

    3. Enter the following menus: Powertrain / Hybrid Control / Trouble Codes.

    4. Check for DTCs.

      Tech Tips

      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.


    A

    REFER TO REPLACE INVERTER WITH CONVERTER ASSEMBLY PARTS Click here

    B

    GO TO DTC CHART (HYBRID CONTROL SYSTEM) Click here

  7. CONNECT SECURELY

    Result
    Proceed to
    NEXT

    NEXT

    GO TO STEP 12 Click here

  8. CONNECT SECURELY

    Result
    Proceed to
    NEXT

    NEXT

    GO TO STEP 12 Click here

  9. REPAIR OR REPLACE MALFUNCTIONING PARTS

    Result
    Proceed to
    NEXT

    NEXT

    GO TO STEP 12 Click here

  10. REPAIR OR REPLACE MALFUNCTIONING PARTS

    Result
    Proceed to
    NEXT

    NEXT

    GO TO STEP 12 Click here

  11. REPAIR OR REPLACE MALFUNCTIONING PARTS

    Result
    Proceed to
    NEXT

    NEXT

  12. CLEAR DTC

    Result
    Proceed to
    NEXT

    1. Connect the GTS to the DLC3.

    2. Turn the power switch on (IG).

    3. Enter the following menus: Powertrain / Hybrid Control / Trouble Codes.

    4. Read and record the DTCs and freeze frame data.


      Powertrain > Hybrid Control > Trouble Codes

    5. Clear the DTCs and freeze frame data.


      Powertrain > Hybrid Control > Clear DTCs

    6. Turn the power switch off.

      Result
      Proceed to
      NEXT

    NEXT

  13. 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

    NEXT

  14. CHECK DTC OUTPUT (HYBRID CONTROL)


    1. Connect the GTS 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.


    A

    END

    B

    REFER TO REPLACE INVERTER WITH CONVERTER ASSEMBLY PARTS Click here

    C

    GO TO DTC CHART (HYBRID CONTROL SYSTEM) Click here