DTC P3246-202: Short in Drive Motor "A" Inverter Circuit: Procedure

1. Remove the service plug grip. Refer to PRECAUTION .
   NOTE:

   After removing the service plug grip, do not turn the power switch on (READY), unless instructed by the repair information because this may cause a malfunction.

2. Check that the service plug grip is not installed.
3. Disconnect the generator cable and motor cable from the inverter with converter assembly.

   HINT: 

   For the removal and installation procedures related to the generator cable and motor cable. Refer to REMOVAL .

4. Check MG2 for an interphase short using a milliohmmeter.
   Fig 1: Identifying Motor Cable Pins

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
   1. Using a milliohmmeter, measure the resistance according to the value(s) in the table below.

      HINT: 

      If the MG2 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
      U - V	Power switch off	46.9 to 51.8 mΩ
      V - W	Power switch off	47.1 to 52.1 mΩ
      W - U	Power switch off	46.8 to 51.8 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)
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	Switch Condition	Specified Condition
   U - Body ground and shielded wire ground	Power switch off	100 MΩ or higher
   V - Body ground and shielded wire ground	Power switch off	100 MΩ or higher
   W - Body ground and shielded wire ground	Power switch off	100 MΩ or higher

NG → See step   3 

OK: Go to next step 

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

NEXT → See step   8 

NG → See step   6 

OK: Go to next step 

1. Replace the hybrid vehicle transmission assembly. Refer to REMOVAL .

NEXT: Go to next step 

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

NEXT → See step   8 

1. Replace the motor cable. 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 P3246-202.

   DTC No.	Relevant Diagnosis
   P0A78-113, 128, 284, 286, 287, 505, 506, 806, 807, 808	Drive Motor "A" Inverter Performance

   NOTE:

   DTC P3246-202 is stored after any of DTCs P0A78-113, 128, 284, 286, 287, 505, 506, 806, 807 and 808 are stored. After troubleshooting and repairing DTC P3246-202, be sure to troubleshoot all the other DTCs.

NEXT → See step   9