HYBRID CONTROL SYSTEM, Diagnostic DTC:P0A79-712

DTC Code DTC Name
P0A79-712 Drive Motor "B" Inverter Performance

DTC SUMMARY


  1. MALFUNCTION DESCRIPTION

    This DTC indicates that a large current flowed in the inverter for the rear motor. 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 4
    Rear motor resolver Open or short circuit in the rear motor resolver circuit 5
    Rear motor

    • Open or short circuit in the rear motor coils

    • Internal rear motor malfunction (iron particles or damage from foreign objects)

    		 6
    Inverter

    • Internal circuit malfunction in the inverter for the rear motor

    • Malfunction in ECU that controls the inverter

    • Malfunction in the sensors for inverter control (current sensor, voltage sensors (VH, VL), etc.)

    		 7

DESCRIPTION

For a description of the inverter.

Click here

If the rear motor inverter overheats, has a circuit malfunction or internal short, the inverter transmits this information to the MG ECU via the rear motor inverter fail signal line.

Tech Tips

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

DTC No. Detection Item DTC Detection Condition Trouble Area MIL Warning Indicate
P0A79-712 Drive Motor "B" Inverter Performance

Rear motor inverter fail signal detected

(system overcurrent)*:

A malfunction is detected in any of the rear motor components (rear motor inverter, rear motor, MG ECU, etc.).

(1 trip detection logic)

  • Inverter with converter assembly

  • Rear traction motor with transaxle assembly

  • PCU fuse

  • Wire harness or connector

  • Hybrid vehicle control ECU

  • No. 2 frame wire

  • Extension wire assembly

 Comes on

Master Warning Light:

Comes on

*: This DTC is output when there is an overcurrent in the rear motor inverter and there is no history information indicating the specific part.

Check related parts (rear motor inverter, rear motor, rear motor resolver, cable, wire harness, hybrid vehicle control ECU).

WIRING DIAGRAM

Refer to the wiring diagram for the rear motor resolver circuit.

Click here

Refer to the wiring diagram for the rear motor high-voltage 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.

Click here

Tech Tips

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


  1. Turn the power switch on (READY) and wait for 5 seconds or more.

  2. Perform a road test according to the freeze frame data item "Vehicle Spd" for approximately 10 minutes.

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
      P0A79-712 is set before any of the DTCs in the table below are set. A
      Any of the DTCs including pending DTCs in the table below are set before P0A79-712 is set. B
      Relevant DTC
      P0A9C-123 Hybrid Battery Temperature Sensor "A" Range / Performance
      P0A9D-123 Hybrid Battery Temperature Sensor "A" Circuit Low
      P0A9E-123 Hybrid Battery Temperature Sensor "A" Circuit High
      P0AC0-123 Hybrid Battery Pack Current Sensor Circuit Range / Performance
      P0AC1-123 Hybrid Battery Pack Current Sensor Circuit Low
      P0AC2-123 Hybrid Battery Pack Current Sensor Circuit High
      P0AC6-123 Hybrid Battery Temperature Sensor "B" Range / Performance
      P0AC7-123 Hybrid Battery Temperature Sensor "B" Circuit Low
      P0AC8-123 Hybrid Battery Temperature Sensor "B" Circuit High
      P0ACB-123 Hybrid Battery Temperature Sensor "C" Range / Performance
      P0ACC-123 Hybrid Battery Temperature Sensor "C" Circuit Low
      P0ACD-123 Hybrid Battery Temperature Sensor "C" Circuit High
      P0AE9-123 Hybrid Battery Temperature Sensor "D" Range / Performance
      P0AEA-123 Hybrid Battery Temperature Sensor "D" Circuit Low
      P0AEB-123 Hybrid Battery Temperature Sensor "D" Circuit High
      P0AFC-123 Hybrid Battery Pack Sensor Module
      P0BC3-123 Hybrid Battery Temperature Sensor "E" Range / Performance
      P0BC4-123 Hybrid Battery Temperature Sensor "E" Circuit Low
      P0BC5-123 Hybrid Battery Temperature Sensor "E" Circuit High
      P0C34-123 Hybrid Battery Temperature Sensor "F" Range / Performance
      P0C35-123 Hybrid Battery Temperature Sensor "F" Circuit Low
      P0C36-123 Hybrid Battery Temperature Sensor "F" Circuit High
      P3011-123, P3012-123, P3013-123, P3014-123, P3015-123, P3016-123, P3017-123, P3018-123, P3019-123, P3020-123, P3021-123, P3022-123, P3023-123, P3024-123, P3025-123, P3026-123, P3027-123 Battery Block # Becomes Weak
      P308A-123 Hybrid Battery Voltage Sensor All Circuits Low

      Tech Tips

      P0A79-712 may be output as a result of the malfunction indicated by the DTCs above.

    5. Turn the power switch off.


    B

    GO TO DTC CHART (HYBRID BATTERY SYSTEM) Click here

    A

  2. 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
      Proceed to
      P0A79-716 is not output.
      P0A79-716 is also output.

      Note


      • If P0A79-716 is output, troubleshoot it first. After completing the troubleshooting for P0A79-716, perform troubleshooting for this DTC.

      • Parts repaired or replaced during troubleshooting for P0A79-716 do not need to be re-inspected in this diagnostic procedure.

    5. Turn the power switch off.


    P0A79-716 is also output.

    GO TO DTC CHART (HYBRID CONTROL SYSTEM) Click here

    P0A79-716 is not output.

  3. 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

      Tech Tips


      • If P0A79-716 was not output in step 2 of this diagnostic procedure, check Table 1 below.

      • If P0A79-716 was output in step 2 of this diagnostic procedure, diagnose that DTC first, then check Table 2 below.

      Result
      Result Proceed to
      P0A79-712 only is output, or DTCs except the ones in the tables below are also output. A
      Any of the following DTCs including pending DTCs are also output. B
      Table 1
      Malfunction Content Relevant DTC
      Microcomputer malfunction P0A1A-151, 166, 658, 791 Generator Control Module
      P0A1B-198, 786, 794 Drive Motor "A" Control Module
      P0A1C-709, 710, 713, 797 Drive Motor "B" Control Module
      P0A1D (all INF codes)*1 Hybrid Powertrain Control Module
      P1C2A-155 Generator A/D Converter Circuit
      P1C2B-192 Drive Motor "A" A/D Converter Circuit
      P1C2C-706 Drive Motor "B" A/D Converter Circuit
      P1CA6-156 Generator Control Module Malfunction
      P1CA7-193 Drive Motor Control Module Malfunction
      P1CA8-708 Drive Motor "B" Control Module Malfunction
      P1CAC-200 Generator Position Sensor Angle Malfunction
      P1CAD-168 Drive Motor "A" Position Sensor Angle Malfunction
      P1CAE-715 Drive Motor "B" Position Sensor Angle Malfunction
      P1CAF-792 Generator Position Sensor REF Signal Cycle Malfunction
      P1CB0-795 Drive Motor "A" Position Sensor REF Signal Cycle Malfunction
      P1CB1-798 Drive Motor "B" Position Sensor REF Signal Cycle Malfunction
      P1CB2-793 Generator Position Sensor REF Signal Stop Malfunction
      P1CB3-796 Drive Motor "A" Position Sensor REF Signal Stop Malfunction
      P1CB4-799 Drive Motor "B" Position Sensor REF Signal Stop Malfunction
      P3133-659 Communication Error from Generator to Drive Motor "A"
      P3134-661 Communication Error from Drive Motor "A" to Generator
      Power source circuit malfunction P06B0-163 Sensor Power Supply "A" Circuit / Open
      P06D6-511 Sensor Reference Voltage "F" Circuit / Open
      P06E6-164 Sensor Power Supply "C" Circuit / Open
      P1C73-512 Sensor Standard Voltage "F" Circuit / Open
      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
      P0BEA-290 Drive Motor "A" Phase V Current Sensor Circuit Range / Performance
      P0BEE-298 Drive Motor "A" Phase W Current Sensor Circuit Range / Performance
      P0BF6-683 Drive Motor "B" Phase V Current Sensor Circuit Range / Performance
      P0BFA-685 Drive Motor "B" Phase W Current Sensor Circuit Range / Performance
      P0E05-328 Generator Phase V Current Sensor Circuit Range / Performance
      P0E09-336 Generator Phase W Current Sensor Circuit Range / Performance
      P1C3C-294 Drive Motor "A" Phase V Current Sensor Correlation
      P1C3D-302 Drive Motor "A" Phase W Current Sensor Correlation
      P1C3E-333 Generator Phase V Current Sensor Correlation
      P1C3F-341 Generator Phase W Current Sensor Correlation
      P1C4A-288 Drive Motor "A" Phase V Current Sensor Sub Circuit Range / Performance
      P1C4F-296 Drive Motor "A" Phase W Current Sensor Sub Circuit Range / Performance
      P1C54-326 Generator Phase V Current Sensor Sub Circuit Range / Performance
      P1C59-334 Generator Phase W Current Sensor Sub Circuit Range / Performance
      P1C6D-501 Drive Motor "A" Phase V Current Sensor Offset Range / Performance
      P1C6E-502 Drive Motor "A" Phase W Current Sensor Offset Range / Performance
      P1C6F-688 Drive Motor "B" Phase V Current Sensor Offset Range / Performance
      P1C70-689 Drive Motor "B" Phase W Current Sensor Offset Range / Performance
      P1C71-515 Generator Phase V Current Sensor Offset Range / Performance
      P1C72-516 Generator Phase W Current Sensor Offset Range / Performance
      P33C1-684 Drive Motor "B" Phase V Current Sensor Sub Circuit Range / Performance
      P33C6-686 Drive Motor "B" Phase W Current Sensor Sub Circuit Range / Performance
      P33D8-677 Drive Motor "B" Phase V Current Sensor Correlation
      P33D9-678 Drive Motor "A" Phase W Current Sensor Correlation
      System malfunction P0A1A-517, 809 Generator Control Module
      P0A1B-503, 505, 547, 554, 806 Drive Motor "A" Control Module
      P0A1C-118, 124, 169, 693, 812 Drive Motor "B" Control Module
      P0A40-504, 506, 549, 556, 808 Drive Motor "A" Position Sensor Circuit Range / Performance
      P0A46-120, 126, 171, 695, 814 Drive Motor "B" Position Sensor Circuit Range / Performance
      P0A4C-518, 811 Generator Position Sensor Circuit Range / Performance
      P0A78-279, 287, 548, 555, 807 Drive Motor "A" Inverter Performance
      P0A79-119, 125, 170, 694, 813 Drive Motor "B" Inverter Performance
      P0A7A-324, 325, 810 Generator Inverter Performance
      P0A90-509 Drive Motor "A" Performance
      P0A91-702 Drive Motor "B" Performance
      P0A92-521 Hybrid Generator Performance
      P0ADB-227 Hybrid Battery Positive Contactor Control Circuit Low
      P0ADC-226 Hybrid Battery Positive Contactor Control Circuit High
      P0ADF-229 Hybrid Battery Negative Contactor Control Circuit Low
      P0AE0-228 Hybrid Battery Negative Contactor Control Circuit High
      P0C19-306 Drive Motor "A" Torque Delivered Performance
      P0C1A-704 Drive Motor "B" Torque Delivered Performance
      P0C76-523 Hybrid Battery System Discharge Time Too Long
      P0CA3-442 DC/DC Converter Step Up Voltage Performance
      P0D2E-586 Drive Motor "A" Inverter Voltage Sensor Circuit Range / Performance
      P0D2F-266 Drive Motor "A" Inverter Voltage Sensor Circuit Low
      P0D30-267 Drive Motor "A" Inverter Voltage Sensor Circuit High
      P0E32-585 DC/DC Converter Voltage Sensor "A" Range / Performance
      P0E33-589 DC/DC Converter Voltage Sensor "A" Low
      P0E34-590 DC/DC Converter Voltage Sensor "A" High
      P0E71-344 Generator Torque Delivered Performance
      P1C2D-587 Hybrid Battery Voltage / DC/DC Converter Voltage Correlation
      P3004-803 High Voltage Power Resource
      Table 2
      Malfunction Content Relevant DTC
      Microcomputer malfunction P0A1A-151, 166, 658, 791 Generator Control Module
      P0A1B-198, 786, 794 Drive Motor "A" Control Module
      P0A1C-709, 710, 713, 797 Drive Motor "B" Control Module
      P0A1D (all INF codes)*1 Hybrid Powertrain Control Module
      P1C2A-155 Generator A/D Converter Circuit
      P1C2B-192 Drive Motor "A" A/D Converter Circuit
      P1C2C-706 Drive Motor "B" A/D Converter Circuit
      P1CA6-156 Generator Control Module Malfunction
      P1CA7-193 Drive Motor Control Module Malfunction
      P1CA8-708 Drive Motor "B" Control Module Malfunction
      P1CAC-200 Generator Position Sensor Angle Malfunction
      P1CAD-168 Drive Motor "A" Position Sensor Angle Malfunction
      P1CAE-715 Drive Motor "B" Position Sensor Angle Malfunction
      P1CAF-792 Generator Position Sensor REF Signal Cycle Malfunction
      P1CB0-795 Drive Motor "A" Position Sensor REF Signal Cycle Malfunction
      P1CB1-798 Drive Motor "B" Position Sensor REF Signal Cycle Malfunction
      P1CB2-793 Generator Position Sensor REF Signal Stop Malfunction
      P1CB3-796 Drive Motor "A" Position Sensor REF Signal Stop Malfunction
      P1CB4-799 Drive Motor "B" Position Sensor REF Signal Stop Malfunction
      P3133-659 Communication Error from Generator to Drive Motor "A"
      P3134-661 Communication Error from Drive Motor "A" to Generator
      Power source circuit malfunction P06B0-163 Sensor Power Supply "A" Circuit / Open
      P06D6-511 Sensor Reference Voltage "F" Circuit / Open
      P06E6-164 Sensor Power Supply "C" Circuit / Open
      P1C73-512 Sensor Standard Voltage "F" Circuit / Open
      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
      P0BEA-290 Drive Motor "A" Phase V Current Sensor Circuit Range / Performance
      P0BEE-298 Drive Motor "A" Phase W Current Sensor Circuit Range / Performance
      P0E05-328 Generator Phase V Current Sensor Circuit Range / Performance
      P0E09-336 Generator Phase W Current Sensor Circuit Range / Performance
      P1C3C-294 Drive Motor "A" Phase V Current Sensor Correlation
      P1C3D-302 Drive Motor "A" Phase W Current Sensor Correlation
      P1C3E-333 Generator Phase V Current Sensor Correlation
      P1C3F-341 Generator Phase W Current Sensor Correlation
      P1C4A-288 Drive Motor "A" Phase V Current Sensor Sub Circuit Range / Performance
      P1C4F-296 Drive Motor "A" Phase W Current Sensor Sub Circuit Range / Performance
      P1C54-326 Generator Phase V Current Sensor Sub Circuit Range / Performance
      P1C59-334 Generator Phase W Current Sensor Sub Circuit Range / Performance
      P1C6D-501 Drive Motor "A" Phase V Current Sensor Offset Range / Performance
      P1C6E-502 Drive Motor "A" Phase W Current Sensor Offset Range / Performance
      P1C71-515 Generator Phase V Current Sensor Offset Range / Performance
      P1C72-516 Generator Phase W Current Sensor Offset Range / Performance
      P33D8-677 Drive Motor "B" Phase V Current Sensor Correlation
      P33D9-678 Drive Motor "A" Phase W Current Sensor Correlation
      System malfunction P0A1A-517, 809 Generator Control Module
      P0A1B-503, 505, 547, 554, 806 Drive Motor "A" Control Module
      P0A1C-118, 124, 169, 693, 812 Drive Motor "B" Control Module
      P0A40-504, 506, 549, 556, 808 Drive Motor "A" Position Sensor Circuit Range / Performance
      P0A46-120, 126, 171, 695, 814 Drive Motor "B" Position Sensor Circuit Range / Performance
      P0A4C-518, 811 Generator Position Sensor Circuit Range / Performance
      P0A78-279, 287, 548, 555, 807 Drive Motor "A" Inverter Performance
      P0A79-119, 125, 170, 694, 813 Drive Motor "B" Inverter Performance
      P0A7A-324, 325, 810 Generator Inverter Performance
      P0A90-509 Drive Motor "A" Performance
      P0A92-521 Hybrid Generator Performance
      P0ADB-227 Hybrid Battery Positive Contactor Control Circuit Low
      P0ADC-226 Hybrid Battery Positive Contactor Control Circuit High
      P0ADF-229 Hybrid Battery Negative Contactor Control Circuit Low
      P0AE0-228 Hybrid Battery Negative Contactor Control Circuit High
      P0C19-306 Drive Motor "A" Torque Delivered Performance
      P0C76-523 Hybrid Battery System Discharge Time Too Long
      P0CA3-442 DC/DC Converter Step Up Voltage Performance
      P0D2E-586 Drive Motor "A" Inverter Voltage Sensor Circuit Range / Performance
      P0D2F-266 Drive Motor "A" Inverter Voltage Sensor Circuit Low
      P0D30-267 Drive Motor "A" Inverter Voltage Sensor Circuit High
      P0E32-585 DC/DC Converter Voltage Sensor "A" Range / Performance
      P0E33-589 DC/DC Converter Voltage Sensor "A" Low
      P0E34-590 DC/DC Converter Voltage Sensor "A" High
      P0E71-344 Generator Torque Delivered Performance
      P1C2D-587 Hybrid Battery Voltage / DC/DC Converter Voltage Correlation
      P3004-803 High Voltage Power Resource

      Tech Tips


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

      • P0A79-712 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

  4. 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

  5. CHECK REAR MOTOR RESOLVER CIRCUIT

    Click here

    Result
    Proceed to
    NEXT

    NEXT

  6. CHECK REAR MOTOR HIGH-VOLTAGE CIRCUIT

    Click here

    Result
    Proceed to
    NEXT

    NEXT

  7. CHECK INVERTER LOW-VOLTAGE CIRCUIT

    Click here

    Tech Tips

    If the "Inverter Low-voltage Circuit" inspection results are normal, perform the next step.

    Result
    Proceed to
    NEXT

    NEXT

    REPLACE INVERTER WITH CONVERTER ASSEMBLY Click here