HYBRID CONTROL SYSTEM, Diagnostic DTC:P0A91-705

DTC Code DTC Name
P0A91-705 Drive Motor "B" Performance

DTC SUMMARY


  1. MALFUNCTION DESCRIPTION

    This DTC indicates that magnetic force deterioration of the permanent magnet located in the rotor inside the rear motor has been detected. The cause of this malfunction may be one of the following:

    Area Main Malfunction Description Step
    Inverter low-voltage circuit The connectors are not connected properly 3
    Hybrid vehicle control ECU Hybrid vehicle control ECU internal circuit malfunction 4
    Inside of inverter Inverter with converter assembly internal circuit malfunction 4
    Rear motor cable

    • Defective rear motor cable connection

    • Open circuit or poor insulation on rear motor cable

    		 5
    Extension wire assembly

    • Defective extension wire assembly cable connection condition

    • Open circuit or poor insulation in extension wire assembly

    		 5
    Rear traction motor with transaxle assembly

    • Internal rear motor malfunction (entry of foreign matter, etc.)

    • Rear motor permanent magnet magnetic force deterioration

    • Open or short circuit in the rear motor coils

    		 5

DESCRIPTION

For a description of the rear motor (MGR).

Click here

The MG ECU controls the rear motor (MGR) torque according to driving conditions.

Tech Tips

The term "drive motor B" indicates the rear motor (MGR).

DTC No. Detection Item DTC Detection Condition Trouble Area MIL Warning Indicate
P0A91-705 Drive Motor "B" Performance

Rear motor magnetic force deterioration or same phase short circuit:

Magnetic force of the rear motor decreases or a coil circuit in one of the 3 phases remains shorted for a certain period of time.

(1 trip detection logic)

  • No. 2 frame wire

  • Rear traction motor with transaxle assembly

  • Extension wire assembly

  • Inverter with converter assembly

  • Hybrid vehicle control ECU

  • Wire harness or connector

 Comes on

Master Warning Light:

Comes on
Related Data List
DTC No. Data List
P0A91-705 Rear Motor Temp Max

WIRING DIAGRAM

Refer to the wiring diagram for DTC P0AA6-526.

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Refer to the wiring diagram for the shut down signal circuit.

Click here

CAUTION / NOTICE / HINT

CAUTION:


  • Before inspecting the high-voltage system or disconnecting the low voltage connector of the inverter with converter assembly, take safety precautions such as wearing insulated gloves and removing the service plug grip to prevent electrical shocks. After removing the service plug grip, put it in your pocket to prevent other technicians from accidentally reconnecting it while you are working on the high-voltage system.

  • After removing the service plug grip, wait for at least 10 minutes before touching any of the high-voltage connectors or terminals. After waiting for 10 minutes, check the voltage at the terminals in the inspection point in the inverter with converter assembly. The voltage should be 0 V before beginning work.

    Click here

    Tech Tips

    Waiting for at least 10 minutes is required to discharge the high-voltage capacitor inside the inverter with converter assembly.

Note

After turning the power switch off, waiting time may be required before disconnecting the cable from the negative (-) auxiliary battery terminal. Therefore, make sure to read the disconnecting the cable from the negative (-) auxiliary battery terminal notices before proceeding with work.

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Tech Tips

After the repair, clear the DTCs and perform the following procedure to check that DTCs are not output.


  1. Drive the vehicle until the cumulative traveling time driving at a vehicle speed of 40 km/h (25 mph) or more is a few minutes. (It is not necessary to drive continuously at 40 km/h (25 mph) or more.)

PROCEDURE


  1. 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
      P0A91-705 only is output, or DTCs except the ones in the table below are also output. A
      Any of the following DTCs are also output. B
      Malfunction Content Relevant DTC
      Microcomputer malfunction P0A1A (all INF codes)*1 Generator Control Module
      P0A1B-168, 192, 193, 198, 661, 786, 794, 795, 796 Drive Motor "A" Control Module
      P0A1C (all INF codes)*1 Drive Motor "B" Control Module
      P0A1D (all INF codes)*1 Hybrid Powertrain Control Module
      Power source circuit malfunction P0A1B-163, 164, 511, 512 Drive Motor "A" Control Module
      Sensor and actuator circuit malfunction P0A3F-243 Drive Motor "A" Position Sensor Circuit
      P0A40-500 Drive Motor "A" Position Sensor Circuit Range/Performance
      P0A41-245 Drive Motor "A" Position Sensor Circuit Low
      P0A45-669 Drive Motor "B" Position Sensor Circuit
      P0A46-671 Drive Motor "B" Position Sensor Circuit Range/Performance
      P0A47-670 Drive Motor "B" Position Sensor Circuit Low
      P0A4B-253 Generator Position Sensor Circuit
      P0A4C-513 Generator Position Sensor Circuit Range/Performance
      P0A4D-255 Generator Position Sensor Circuit Low
      P0A51-174 Drive Motor "A" Current Sensor Circuit
      P0A55-687 Drive Motor "B" Current Sensor Circuit
      P0A60 (all INF codes)*1 Drive Motor "A" Phase V Current
      P0A63 (all INF codes)*1 Drive Motor "A" Phase W Current
      P0A69 (all INF codes)*1 Drive Motor "B" Phase V Current
      P0A6C (all INF codes)*1 Drive Motor "B" Phase W Current
      P0A72 (all INF codes)*1 Generator Phase V Current
      P0A75 (all INF codes)*1 Generator Phase W Current
      System malfunction P0AA6 (all INF codes)*1 Hybrid Battery Voltage System Isolation Fault
      P3004-132 High Voltage Power Resource
      P0A78-266, 267, 306, 586 Drive Motor "A" Inverter Performance
      P0A79-704, 716 Drive Motor "B" Current Sensor Circuit
      P0A7A-344 Generator Inverter Performance
      P0A91-702 Drive Motor "B" Performance
      P0A94-557, 585, 587, 589, 590 DC / DC Converter Performance
      P0C76-523 Hybrid Battery System Discharge Time Too Long

      Tech Tips


      • *1: If any INF codes are output for this DTC, refer to the corresponding diagnostic procedure.

      • P0A91-705 may be output as a result of the malfunction indicated by the DTCs above.


        1. The chart above is listed in inspection order of priority.

        2. Check DTCs that are output at the same time by following the listed order. (The main cause of the malfunction can be determined without performing unnecessary inspections.)

    5. Turn the power switch off.


    B

    GO TO DTC CHART (HYBRID CONTROL SYSTEM) Click here

    A

  2. SIMULATION TEST


    1. Connect the GTS to the DLC3.

    2. Turn the power switch on (READY).

    3. Drive the vehicle at a speed of 40 km/h (25 mph) for approximately 1 minute.

      CAUTION:

      When performing the confirmation driving pattern, obey all speed limits and traffic laws.

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

    5. Check for DTCs.


      Powertrain > Hybrid Control > Trouble Codes
      Result
      Proceed to
      P0A91-705 is output or no DTCs are output.
      Except P0A91-705 is output.

    6. Turn the power switch off.


    Except P0A91-705 is output.

    GO TO DTC CHART (HYBRID CONTROL SYSTEM) Click here

    P0A91-705 is output or no DTCs are output.

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

    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

    CAUTION:

    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 manual because this may cause a malfunction.

    2. B002I4J

      Check the connection condition of the low voltage connector of the inverter with converter assembly and the contact pressure of each terminal. Check the terminals for deformation, and check the connector for water ingress and foreign matter.

      Click here

      Note

      Before disconnecting the connector, confirm that it is properly connected by checking that the locking claws are engaged and that the connector does not pull out.

      OK
      - The connector is connected securely.
      - The terminals are not deformed and are connected securely.
      - No water or foreign matter in the connector.
      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

      Tech Tips

      When connecting the connector, insert it with the locking lever in the raised position. Rotate the lever downward and make sure that the connector is pulled into its socket. When the locking lever is in its fully closed position, a click will be heard as its locking claws engage. After the click is heard, pull up on the connector to confirm that it is properly connected.


    B

    CONNECT SECURELY

    C

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    A

  4. CHECK SHUT DOWN SIGNAL CIRCUIT

    Click here

    Result
    Proceed to
    NEXT

    NEXT

  5. CHECK REAR MOTOR HIGH-VOLTAGE CIRCUIT

    Click here

    Tech Tips

    If the "Rear Motor High-voltage Circuit" inspection results are normal, perform the next step.

    Result
    Proceed to
    NEXT

    NEXT

    REPLACE REAR TRACTION MOTOR WITH TRANSAXLE ASSEMBLY Click here