DTC P0A78-121: Drive Motor "A" Inverter Performance [11/2016 - ]: Description

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.

For a description of the inverter.

Refer to DESCRIPTION

If a malfunction occurs in the motor inverter or generator inverter, the MG ECU detects it and transmits this information to the hybrid vehicle control ECU assembly.

HINT:

The term "drive motor A" indicates the motor (MG2).

DTC No.	Detection Item	DTC Detection Condition	Trouble Area	MIL	Warning Indicate
P0A78-121	Drive Motor "A" Inverter Performance	Motor inverter overvoltage signal detected (overvoltage due to system malfunction): Overvoltage is detected after boosting. A malfunction is detected in any of the motor components (motor inverter, motor, MG ECU, etc.). (1 trip detection logic)	Hybrid battery junction block assembly Inverter with converter assembly Service plug grip (EV battery fuse) Hybrid vehicle transaxle assembly Rear traction motor with transaxle assembly No. 6 floor wire Extension wire assembly Hybrid vehicle control ECU assembly PCU fuse Wire harness or connector	Comes on	Master Warning Light: Comes on

RELATED DATA LIST

DTC No.	Data List
P0A78-121	VH-Voltage after Boosting