DTC P0A79-716: Drive Motor "B" Inverter Performance: Procedure

NG → See step   3 

OK: Go to next step 

1. Replace the inverter with converter assembly. Refer to REMOVAL .

NEXT → See step   20 

NG → See step   10 

OK: Go to next step 

NG → See step   6 

OK: Go to next step 

1. Replace the rear traction motor with transaxle assembly. Refer to REMOVAL .

NEXT → See step   19 

1. Check that the service plug grip is not installed.
2. Remove the No. 3 wire frame and extension wire assembly from the rear traction motor with transaxle assembly.
3. Check MGR for an interphase short using a milliohmmeter.
   1. Using a milliohmmeter, measure the resistance according to the value(s) in the table below.
      Fig 1: Checking Rear Traction Motor With Transaxle Assembly (MGR)

      Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

      HINT: 

      If the 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	Switch Condition	Specified Condition
      j10-3 (R-U) - j10-2 (R-V)	Ignition switch off	142 to 152 mΩ
      j10-2 (R-V) - j10-1 (R-W)	Ignition switch off	142 to 152 mΩ
      j10-1 (R-W) - j10-3 (R-U)	Ignition switch off	142 to 152 mΩ

      HINT: 

      • To correct the variation of the measured resistance due to temperature, use the following formula to calculate the resistance at 68°F (20°C).
        • R20 = Rt / {1 + 0.00393 X (T - 20)}
      • The calculation is based on the following:
        • R20: Resistance at 68°F (20°C) (mΩ)
        • Rt: Measured resistance (mΩ)
        • T: Temperature when the resistance is measured (°C)
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	Switch Condition	Specified Condition
   j10-3 (R-U) - Body ground and shielded wire ground	Ignition switch off	100 MΩ or higher
   j10-2 (R-V) - Body ground and shielded wire ground	Ignition switch off	100 MΩ or higher
   j10-1 (R-W) - Body ground and shielded wire ground	Ignition switch off	100 MΩ or higher

5. Install the No. 3 wire frame and extension wire assembly to the rear traction motor with transaxle assembly.

NG → See step   8 

OK: Go to next step 

1. Replace the extension wire assembly. Refer to REMOVAL .

NEXT → See step   19 

1. Replace the rear traction motor with transaxle assembly. Refer to REMOVAL .

NEXT: Go to next step 

1. Replace the extension wire assembly. Refer to REMOVAL .

NEXT → See step   19 

NG → See step   13 

OK: Go to next step 

1. Check that the service plug grip is not installed.
2. Remove the No. 3 wire frame and extension wire assembly from the rear traction motor with transaxle assembly.
3. Check MGR for an interphase short using a milliohmmeter.
   1. Using a milliohmmeter, measure the resistance according to the value(s) in the table below.
      Fig 2: Checking Rear Traction Motor With Transaxle Assembly (MGR)

      Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

      HINT: 

      If the 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	Switch Condition	Specified Condition
      j10-3 (R-U) - j10-2 (R-V)	Ignition switch off	142 to 152 mΩ
      j10-2 (R-V) - j10-1 (R-W)	Ignition switch off	142 to 152 mΩ
      j10-1 (R-W) - j10-3 (R-U)	Ignition switch off	142 to 152 mΩ

      HINT: 

      • To correct the variation of the measured resistance due to temperature, use the following formula to calculate the resistance at 68°F (20°C).
        • R20 = Rt / {1 + 0.00393 X (T - 20)}
      • The calculation is based on the following:
        • R20: Resistance at 68°F (20°C) (mΩ)
        • Rt: Measured resistance (mΩ)
        • T: Temperature when the resistance is measured (°C)
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	Switch Condition	Specified Condition
   j10-3 (R-U) - Body ground and shielded wire ground	Ignition switch off	100 MΩ or higher
   j10-2 (R-V) - Body ground and shielded wire ground	Ignition switch off	100 MΩ or higher
   j10-1 (R-W) - Body ground and shielded wire ground	Ignition switch off	100 MΩ or higher

5. Install the No. 3 wire frame and extension wire assembly to the rear traction motor with transaxle assembly.

NG → See step   17 

OK: Go to next step 

1. Replace the No. 3 wire frame. Refer to REMOVAL .

NEXT → See step   19 

1. Check that the service plug grip is not installed.
2. Remove the No. 3 wire frame and extension wire assembly from the rear traction motor with transaxle assembly.
3. Check MGR for an interphase short using a milliohmmeter.
   1. Using a milliohmmeter, measure the resistance according to the value(s) in the table below.
      Fig 3: Checking Rear Traction Motor With Transaxle Assembly (MGR)

      Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

      HINT: 

      If the 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	Switch Condition	Specified Condition
      j10-3 (R-U) - j10-2 (R-V)	Ignition switch off	142 to 152 mΩ
      j10-2 (R-V) - j10-1 (R-W)	Ignition switch off	142 to 152 mΩ
      j10-1 (R-W) - j10-3 (R-U)	Ignition switch off	142 to 152 mΩ

      HINT: 

      • To correct the variation of the measured resistance due to temperature, use the following formula to calculate the resistance at 68°F (20°C).
        • R20 = Rt / {1 + 0.00393 X (T - 20)}
      • The calculation is based on the following:
        • R20: Resistance at 68°F (20°C) (mΩ)
        • Rt: Measured resistance (mΩ)
        • T: Temperature when the resistance is measured (°C)
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	Switch Condition	Specified Condition
   j10-3 (R-U) - Body ground and shielded wire ground	Ignition switch off	100 MΩ or higher
   j10-2 (R-V) - Body ground and shielded wire ground	Ignition switch off	100 MΩ or higher
   j10-1 (R-W) - Body ground and shielded wire ground	Ignition switch off	100 MΩ or higher

5. Install the No. 3 wire frame and extension wire assembly to the rear traction motor with transaxle assembly.

NG → See step   15 

OK: Go to next step 

1. Replace the extension wire assembly. Refer to REMOVAL .

NEXT → See step   18 

1. Replace the rear traction motor with transaxle assembly. Refer to REMOVAL .

NEXT: Go to next step 

1. Replace the extension wire assembly. Refer to REMOVAL .

NEXT → See step   18 

1. Replace the rear traction motor with transaxle assembly. Refer to REMOVAL .

NEXT: Go to next step 

1. Replace the No. 3 wire frame. Refer to REMOVAL .

NEXT: Go to next step 

1. Replace the inverter with converter assembly. Refer to REMOVAL .

NEXT: Go to next step 

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

   Result

   DTC No.	Relevant Diagnosis
   P0A79-136, 692, 693, 694, 695, 696, 712, 812, 813, 814	Drive Motor "B" Inverter Performance

   NOTE:

   DTC P0A79-716 is stored after any of DTCs P0A79-136, 692, 693, 694, 695, 696, 712, 812, 813 and 814 are stored. After troubleshooting and repairing DTC P0A79-716, be sure to troubleshoot all the other DTCs.

NEXT → See step   21