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Home >> Toyota >> 2016 >> Highlander Hybrid Limited >> Repair and Diagnosis >> External Pages >> Different car >> Section 75 (Hybrid Control System (2GR-FXS) - Diagnostic Codes (3 Of 6)) >> Hybrid Control System >> DTC P0A78-202: Drive Motor "A" Inverter Performance [11/2016 - ] >> Caution / Notice / Hint

Caution / Notice / Hint

WARNING: This page is about a different car, the 2019 Toyota Highlander, 2018 Toyota Highlander, and 2017 Toyota Highlander. However, it is still accessible from the selected car via links, so may be relevant.
WARNING:
  • Before inspecting the high-voltage system or disconnecting a low voltage connector of the inverter with converter assembly, make sure to turn the power switch off. Also, 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.

    Refer to PRECAUTION [11/2016 - ]

    HINT: 

    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.

    Refer to PRECAUTION [11/2016 - ]

  • DTC P0A78-202 is stored after DTCs P0A1B-505, P0A40-506, P0A78-113, 284, 286 and/or 287 are stored. After troubleshooting and repairing the malfunction which caused DTC P0A78-202 to be stored, be sure to troubleshoot all the other DTCs.
  • Depending on the conditions in which the vehicle is being operated when a short circuit occurs in the inverter with converter assembly, the hybrid vehicle transaxle assembly may be affected. As this DTC is stored if a short circuit occurs in the inverter with converter assembly, it is necessary to perform a road test to check the hybrid vehicle transaxle assembly. If problems are found, replace the malfunctioning parts.
  • After completing the repair, including the repair of previously output DTCs, drive the vehicle at a speed of approximately 40 km/h (25 mph) for 1 minute and check that DTC P0A90-251 (Drive Motor "A" Performance) is not output. If DTC P0A90-251 (Drive Motor "A" Performance) is output, replace the hybrid vehicle transaxle assembly.

HINT: 

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

  1. With the engine stopped, the power switch on (READY) and the shift lever in P, depress the accelerator pedal to start the engine.
  2. Perform a road test according to the freeze frame data item "Vehicle Spd" for approximately 10 minutes.
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