| DTC Code | DTC Name |
|---|---|
| P0A78-266 | Drive Motor "A" Inverter Performance |
| P0A78-267 | Drive Motor "A" Inverter Performance |
DESCRIPTION
The inverter contains a three-phase bridge circuit, which consists of 6 power transistors (IGBTs) each for MG1 and MG2. The inverter converts high-voltage direct current from the HV battery into three-phase alternating current for MG1 and MG2; it also converts three-phase alternating current supplied by MG1 and MG2 into direct current for the HV battery. The MG ECU controls the actuation of the power transistors (IGBTs). The inverter transmits information necessary for control, such as amperage and voltage, to the MG ECU.
The term "drive motor A" indicates MG2.
The MG ECU uses an inverter voltage sensor, which is built into the inverter, to detect boosted high voltage to allow control of the voltage boost.
The MG ECU monitors the inverter voltage sensor and detects the following malfunctions.
| DTC No. | INF Code | DTC Detection Condition | Trouble Area |
|---|---|---|---|
| P0A78 | 266 | Short to GND in the inverter voltage (VH) signal line | Inverter with converter assembly |
| 267 | Open or short to +B in the inverter voltage (VH) signal line |
PROCEDURE
REPLACE INVERTER WITH CONVERTER ASSEMBLY
The signal line from the inverter voltage (VH) sensor is connected to the MG ECU inside the inverter with converter assembly. If P0A78-266 or P0A78-267 is output, replace the inverter with converter assembly.
COMPLETED