HYBRID CONTROL SYSTEM, Diagnostic DTC:P0A79-716

DTC SUMMARY

1. MALFUNCTION DESCRIPTION

   
   

   Internal inverter malfunction

   • Inverter with converter assembly internal circuit malfunction

   
   

   Rear traction motor with transaxle assembly malfunction

   • Open or short circuit

   • Damage from iron particles or other foreign objects

DESCRIPTION

For a description of the inverter.

Click here

WIRING DIAGRAM

Refer to the wiring diagram for DTC P0AA6-526.

Click here

CAUTION / NOTICE / HINT

PROCEDURE

1. CHECK REAR TRACTION MOTOR WITH TRANSAXLE ASSEMBLY (REAR MOTOR (MGR))

   Result
   Proceed to OK NG

   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. 

      Remove the inverter cover UPR from the inverter with converter assembly.

   3. 

      *1	No. 2 Frame Wire (Rear Motor Cable)

      Disconnect the No. 2 frame wire (rear motor cable) from the inverter with converter assembly.

   4. 

      *1	Shield Ground
      *a	No. 2 Frame Wire (rear motor cable) (Inverter with Converter Assembly Side)

      Check the rear motor (MGR) for an interphase short using a milliohmmeter.

      
      

      1. Using a milliohmmeter, measure the resistance according to the value(s) in the table below.

         Tech Tips

         If the rear motor (MGR) temperature is high, the resistance will vary greatly from the specification. Therefore, measure the resistance at least 8 hours after the vehicle is stopped.

         Standard Resistance
         Tester Connection Condition Specified Condition t1-1 (R-W) - t1-3 (R-U) Power switch off 163 to 176 mΩ t1-2 (R-V) - t1-1 (R-W) Power switch off 163 to 176 mΩ t1-3 (R-U) - t1-2 (R-V) Power switch off 163 to 176 mΩ

         Tech Tips

         To correct the variation of the measured resistance due to temperature, use the following formula to calculate the resistance at 20°C (68°F).

         R20 = Rt / {1 + 0.00393 X (T - 20)}

         The calculation is based on the following:

         R20: Resistance at 20°C (68°F) (mΩ)

         Rt: Measured resistance (mΩ)

         T: Temperature when the resistance is measured (°C (°F).)

   5. When checking for a short circuit between rear motor phases without using a milliohmmeter.

      Note

      The rear motor generates current when wheels are rotated by hand. Before performing the inspection, wrap the rear motor cable terminals with tape (non-residue type) or equivalent.

      Tech Tips

      A short circuit between the rear motor phases can be checked simply without using a milliohmmeter.

      
      

      1. Connect the cable to the negative (-) auxiliary battery terminal.

      2. Turn the power switch on (IG).

         Note

         Turning the power switch on (IG) with the service plug grip removed causes other DTCs to be stored. Clear the DTCs after performing this inspection.

      3. Move the shift lever to N.

      4. Lift up the vehicle.

      5. Rotate the rear wheels in the same direction simultaneously by hand.

         Standard
         Left and right wheels rotate smoothly (No short circuit between phases)

         Tech Tips

         If a short circuit exists between the rear motor phases, the rear wheels do not rotate smoothly (some resistance is felt).

      6. Lower the vehicle.

      7. Move the shift lever to P.

      8. Turn the power switch off.

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

   6. Using a megohmmeter set to 500 V, measure the resistance according to the value(s) in the table below.

      Note

      Be sure to set the megohmmeter to 500 V when performing this test. Using a setting higher than 500 V can result in damage to the component being inspected.

      Standard Resistance
      Tester Connection Condition Specified Condition t1-1 (R-W) - Body ground and shield ground Power switch off 100 MΩ or higher t1-2 (R-V) - Body ground and shield ground Power switch off 100 MΩ or higher t1-3 (R-U) - Body ground and shield ground Power switch off 100 MΩ or higher

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

      Tech Tips

      Perform this procedure only when checking for a short circuit between rear motor phases without using a milliohmmeter.

      Standard Resistance
      Tester Connection Condition Specified Condition t1-1 (R-W) - t1-2 (R-V) Power switch off Below 1 Ω t1-2 (R-V) - t1-3 (R-U) Power switch off Below 1 Ω

   8. Reconnect the No. 2 frame wire (rear motor cable).

   9. Install the inverter cover UPR.

      Result
      Proceed to OK NG

   
   

   OK

   GO TO STEP 14 Click here

   NG

2. CHECK NO. 2 FRAME WIRE (REAR MOTOR CABLE)

   Result
   Proceed to OK NG

   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. 

      Remove the inverter cover UPR from the inverter with converter assembly.

   3. 

      *1	No. 2 Frame Wire (Rear Motor Cable)

      Disconnect the No. 2 frame wire (rear motor cable) from the inverter with converter assembly.

   4. 

      Disconnect the No. 2 frame wire (rear motor cable) from the rear traction motor with transaxle assembly.

   5. 

      *1	Shield Ground
      *a	No. 2 Frame Wire (rear motor cable) (Inverter with Converter Assembly Side)

      Using a megohmmeter set to 500 V, measure the resistance according to the value(s) in the table below.

      Note

      Be sure to set the megohmmeter to 500 V when performing this test. Using a setting higher than 500 V can result in damage to the component being inspected.

      Standard Resistance
      Tester Connection Condition Specified Condition t1-1 (R-W) - Body ground and shield ground Power switch off 10 MΩ or higher t1-2 (R-V) - Body ground and shield ground Power switch off 10 MΩ or higher t1-3 (R-U) - Body ground and shield ground Power switch off 10 MΩ or higher

      Note

      Wrap the terminals of three-phase AC cable with insulating tape to avoid them coming into contact with body ground.

   6. 

      *1	Shield Ground
      *a	No. 2 Frame Wire (rear motor cable) (Inverter with Converter Assembly Side)
      *b	No. 2 Frame Wire (rear motor cable) (Rear Traction Motor with Transaxle Assembly Side)

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

      Standard Resistance
      Tester Connection Condition Specified Condition t1-1 (R-W) - t3-1 (R-W) Power switch off Below 1 Ω t1-2 (R-V) - t3-2 (R-V) Power switch off Below 1 Ω t1-3 (R-U) - t3-3 (R-U) Power switch off Below 1 Ω t1-1 (R-W) - t3-3 (R-U) Power switch off 10 kΩ or higher t1-2 (R-V) - t3-1 (R-W) Power switch off 10 kΩ or higher t1-3 (R-U) - t3-2 (R-V) Power switch off 10 kΩ or higher

   7. Connect the No. 2 frame wire (rear motor cable) to the rear traction motor with transaxle assembly.

   8. Connect the No. 2 frame wire (rear motor cable) to the inverter with converter assembly.

   9. Install the inverter cover UPR.

      Result
      Proceed to OK NG

   
   

   NG

   CHECK EXTENSION WIRE ASSEMBLY Click here

   OK

3. CHECK EXTENSION WIRE ASSEMBLY

   Result
   Proceed to OK NG

   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. Remove the extension wire assembly from the rear traction motor with transaxle assembly.

      Click here

   3. 

      *1	Extension Wire Assembly
      *2	Shield Shell

      Using a megohmmeter set to 500 V, measure the resistance according to the value(s) in the table below.

      Note

      Be sure to set the megohmmeter to 500 V when performing this test. Using a setting higher than 500 V can result in damage to the component being inspected.

      Standard Resistance
      Tester Connection Condition Specified Condition R-U - Shield shell Power switch off 100 MΩ or higher R-V - Shield shell Power switch off 100 MΩ or higher R-W - Shield shell Power switch off 100 MΩ or higher

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

      Standard Resistance
      Tester Connection Condition Specified Condition R-U - R-U Power switch off Below 1 Ω R-V - R-V Power switch off Below 1 Ω R-W - R-W Power switch off Below 1 Ω R-U - R-V Power switch off 100 kΩ or higher R-V - R-W Power switch off 100 kΩ or higher R-W - R-U Power switch off 100 kΩ or higher

   5. Install the extension wire.

      Result
      Proceed to OK NG

   
   

   NG

   CHECK REAR TRACTION MOTOR WITH TRANSAXLE ASSEMBLY (REAR MOTOR (MGR)) Click here

   OK

4. REPLACE REAR TRACTION MOTOR WITH TRANSAXLE ASSEMBLY

   Click here

   Result
   Proceed to NEXT

   
   

   NEXT

   GO TO STEP 14 Click here

5. CHECK EXTENSION WIRE ASSEMBLY

   Result
   Proceed to OK NG

   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. Remove the extension wire assembly from the rear traction motor with transaxle assembly.

      Click here

   3. 

      *1	Extension Wire Assembly
      *2	Shield Shell

      Using a megohmmeter set to 500 V, measure the resistance according to the value(s) in the table below.

      Note

      Be sure to set the megohmmeter to 500 V when performing this test. Using a setting higher than 500 V can result in damage to the component being inspected.

      Standard Resistance
      Tester Connection Condition Specified Condition R-U - Shield shell Power switch off 100 MΩ or higher R-V - Shield shell Power switch off 100 MΩ or higher R-W - Shield shell Power switch off 100 MΩ or higher

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

      Standard Resistance
      Tester Connection Condition Specified Condition R-U - R-U Power switch off Below 1 Ω R-V - R-V Power switch off Below 1 Ω R-W - R-W Power switch off Below 1 Ω R-U - R-V Power switch off 100 kΩ or higher R-V - R-W Power switch off 100 kΩ or higher R-W - R-U Power switch off 100 kΩ or higher

   5. Install the extension wire.

      Result
      Proceed to OK NG

   
   

   NG

   CHECK REAR TRACTION MOTOR WITH TRANSAXLE ASSEMBLY (REAR MOTOR (MGR)) Click here

   OK

6. CHECK REAR TRACTION MOTOR WITH TRANSAXLE ASSEMBLY (REAR MOTOR (MGR))

   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. Remove the No. 2 frame wire (rear motor cable) and extension wire assembly from the rear traction motor with transaxle assembly.

   3. 

      *a	Component without rear motor cable connected (Rear Traction Motor with Transaxle Assembly)

      Check the rear motor (MGR) for an interphase short using a milliohmmeter.

      
      

      1. Using a milliohmmeter, measure the resistance according to the value(s) in the table below.

         Tech Tips

         If the rear motor (MGR) temperature is high, the resistance will vary greatly from the specification. Therefore, measure the resistance at least 8 hours after the vehicle is stopped.

         Standard Resistance
         Tester Connection Condition Specified Condition t3-3 (R-U) - t3-2 (R-V) Power switch off 143 to 155 mΩ t3-2 (R-V) - t3-1 (R-W) Power switch off 143 to 155 mΩ t3-1 (R-W) - t3-3 (R-U) Power switch off 143 to 155 mΩ

         Tech Tips

         To correct the variation of the measured resistance due to temperature, use the following formula to calculate the resistance at 20°C (68°F).

         R20 = Rt / {1 + 0.00393 X (T - 20)}

         The calculation is based on the following:

         R20: Resistance at 20°C (68°F) (mΩ)

         Rt: Measured resistance (mΩ)

         T: Temperature when the resistance is measured (°C (°F).)

   4. When checking for a short circuit between rear motor phases without using a milliohmmeter.

      Note

      The rear motor generates current when wheels are rotated by hand. Before performing the inspection, wrap the rear motor cable terminals with tape (non-residue type) or equivalent.

      Tech Tips

      A short circuit between the rear motor phases can be checked simply without using a milliohmmeter.

      
      

      1. Connect the cable to the negative (-) auxiliary battery terminal.

      2. Turn the power switch on (IG).

         Note

         Turning the power switch on (IG) with the service plug grip removed causes other DTCs to be stored. Clear the DTCs after performing this inspection.

      3. Move the shift lever to N.

      4. Lift up the vehicle.

      5. Rotate the rear wheels in the same direction simultaneously by hand.

         Standard
         Reae wheels rotate smoothly (No short circuit between phases)

         Tech Tips

         If a short circuit exists between the rear motor phases, the rear wheels do not rotate smoothly (some resistance is felt).

      6. Lower the vehicle.

      7. Move the shift lever to P.

      8. Turn the power switch off.

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

   5. Using a megohmmeter set to 500 V, measure the resistance according to the value(s) in the table below.

      Note

      Be sure to set the megohmmeter to 500 V when performing this test. Using a setting higher than 500 V can result in damage to the component being inspected.

      Standard Resistance
      Tester Connection Condition Specified Condition t3-3 (R-U) - Body ground Power switch off 100 MΩ or higher t3-2 (R-V) - Body ground Power switch off 100 MΩ or higher t3-1 (R-W) - Body ground Power switch off 100 MΩ or higher

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

      Tech Tips

      Perform this procedure only when checking for a short circuit between rear motor phases without using a milliohmmeter.

      Standard Resistance
      Tester Connection Condition Specified Condition t3-1 (R-W) - t3-2 (R-V) Power switch off Below 1 Ω t3-2 (R-V) - t3-3 (R-U) Power switch off Below 1 Ω

   7. Install the No. 2 frame wire (rear motor cable) and extension wire assembly to the rear traction motor with transaxle assembly.

      Result
      Proceed to OK NG

   
   

   NG

   REPLACE REAR TRACTION MOTOR WITH TRANSAXLE ASSEMBLY Click here

   OK

7. REPLACE NO. 2 FRAME WIRE

   Click here

   Result
   Proceed to NEXT

   
   

   NEXT

   GO TO STEP 14 Click here

8. CHECK REAR TRACTION MOTOR WITH TRANSAXLE ASSEMBLY (REAR MOTOR (MGR))

   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. Remove the No. 2 frame wire (rear motor cable) and extension wire assembly from the rear traction motor with transaxle assembly.

   3. 

      *a	Component without rear motor cable connected (Rear Traction Motor with Transaxle Assembly)

      Check the rear motor (MGR) for an interphase short using a milliohmmeter.

      
      

      1. Using a milliohmmeter, measure the resistance according to the value(s) in the table below.

         Tech Tips

         If the rear motor (MGR) temperature is high, the resistance will vary greatly from the specification. Therefore, measure the resistance at least 8 hours after the vehicle is stopped.

         Standard Resistance
         Tester Connection Condition Specified Condition t3-3 (R-U) - t3-2 (R-V) Power switch off 142 to 155 mΩ t3-2 (R-V) - t3-1 (R-W) Power switch off 142 to 155 mΩ t3-1 (R-W) - t3-3 (R-U) Power switch off 142 to 155 mΩ

         Tech Tips

         To correct the variation of the measured resistance due to temperature, use the following formula to calculate the resistance at 20°C (68°F).

         
         

         • R20 = Rt / {1 + 0.00393 X (T - 20)}

         The calculation is based on the following:

         
         

         • R20: Resistance at 20°C (68°F) (mΩ)

         • Rt: Measured resistance (mΩ)

         • T: Temperature when the resistance is measured (°C (°F))

   4. Using a megohmmeter set to 500 V, measure the resistance according to the value(s) in the table below.

      Note

      Be sure to set the megohmmeter to 500 V when performing this test. Using a setting higher than 500 V can result in damage to the component being inspected.

      Standard Resistance
      Tester Connection Condition Specified Condition t3-3 (R-U) - Body ground Power switch off 100 MΩ or higher t3-2 (R-V) - Body ground Power switch off 100 MΩ or higher t3-1 (R-W) - Body ground Power switch off 100 MΩ or higher

   5. Install the No. 2 frame wire (rear motor cable) and extension wire assembly to the rear traction motor with transaxle assembly.

      Result
      Proceed to OK NG

   
   

   NG

   REPLACE REAR TRACTION MOTOR WITH TRANSAXLE ASSEMBLY Click here

   OK

9. REPLACE EXTENSION WIRE ASSEMBLY

   Click here

   Result
   Proceed to NEXT

   
   

   NEXT

   GO TO STEP 14 Click here

10. CHECK REAR TRACTION MOTOR WITH TRANSAXLE ASSEMBLY (REAR MOTOR (MGR))

    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. Remove the No. 2 frame wire (rear motor cable) and extension wire assembly from the rear traction motor with transaxle assembly.

    3. 

       *a	Component without rear motor cable connected (Rear Traction Motor with Transaxle Assembly)

       Check the rear motor (MGR) for an interphase short using a milliohmmeter.

       
       

       1. Using a milliohmmeter, measure the resistance according to the value(s) in the table below.

          Tech Tips

          If the rear motor (MGR) temperature is high, the resistance will vary greatly from the specification. Therefore, measure the resistance at least 8 hours after the vehicle is stopped.

          Standard Resistance
          Tester Connection Condition Specified Condition t3-3 (R-U) - t3-2 (R-V) Power switch off 142 to 155 mΩ t3-2 (R-V) - t3-1 (R-W) Power switch off 142 to 155 mΩ t3-1 (R-W) - t3-3 (R-U) Power switch off 142 to 155 mΩ

          Tech Tips

          To correct the variation of the measured resistance due to temperature, use the following formula to calculate the resistance at 20°C (68°F).

          
          

          • R20 = Rt / {1 + 0.00393 X (T - 20)}

          The calculation is based on the following:

          
          

          • R20: Resistance at 20°C (68°F) (mΩ)

          • Rt: Measured resistance (mΩ)

          • T: Temperature when the resistance is measured (°C (°F))

    4. Using a megohmmeter set to 500 V, measure the resistance according to the value(s) in the table below.

       Note

       Be sure to set the megohmmeter to 500 V when performing this test. Using a setting higher than 500 V can result in damage to the component being inspected.

       Standard Resistance
       Tester Connection Condition Specified Condition t3-3 (R-U) - Body ground Power switch off 100 MΩ or higher t3-2 (R-V) - Body ground Power switch off 100 MΩ or higher t3-1 (R-W) - Body ground Power switch off 100 MΩ or higher

    5. Install the No. 2 frame wire (rear motor cable) and extension wire assembly to the rear traction motor with transaxle assembly.

       Result
       Proceed to OK NG

    
    

    NG

    REPLACE REAR TRACTION MOTOR WITH TRANSAXLE ASSEMBLY Click here

    OK

11. REPLACE EXTENSION WIRE ASSEMBLY

    Click here

    Result
    Proceed to NEXT

    
    

    NEXT

    GO TO STEP 13 Click here

12. REPLACE REAR TRACTION MOTOR WITH TRANSAXLE ASSEMBLY

    Click here

    Result
    Proceed to NEXT

    
    

    NEXT

13. REPLACE NO. 2 FRAME WIRE

    Click here

    Result
    Proceed to NEXT

    
    

    NEXT

14. REPLACE INVERTER WITH CONVERTER ASSEMBLY

    Click here

    Result
    Proceed to NEXT

    
    

    NEXT

15. CHECK DTC OUTPUT

    
    

    1. Check the other DTCs that were output together with DTC P0A79-716.

       Result
       DTC No. Relevant Diagnosis P0A1C-693 Drive Motor "B" Control Module P0A46-695 Drive Motor "B" Position Sensor Circuit Range / Performance P0A79-692, 694, 696, 712 Drive Motor "B" Inverter Performance

       Note

       DTC P0A79-716 is stored after DTC P0A1C-693, P0A46-695, P0A79-692, 694, 696 and/or 712 is stored. After troubleshooting and repairing the malfunction which caused DTC P0A79-716 to be stored, be sure to troubleshoot all the other DTCs.

       Result
       Proceed to NEXT

    
    

    NEXT

    GO TO DTC CHART (HYBRID CONTROL SYSTEM) Click here

16. REPLACE REAR TRACTION MOTOR WITH TRANSAXLE ASSEMBLY

    Click here

    Result
    Proceed to NEXT

    
    

    NEXT

17. REPLACE EXTENSION WIRE ASSEMBLY

    Click here

    Result
    Proceed to NEXT

    
    

    NEXT

    GO TO STEP 14 Click here

18. REPLACE REAR TRACTION MOTOR WITH TRANSAXLE ASSEMBLY

    Click here

    Result
    Proceed to NEXT

    
    

    NEXT

19. REPLACE EXTENSION WIRE ASSEMBLY

    Click here

    Result
    Proceed to NEXT

    
    

    NEXT

    GO TO STEP 13 Click here