DTC P0A78-266: Drive Motor "A" Inverter Performance; DTC P0A78-267: Drive Motor "A" Inverter Performance [02/2014 - 11/2016]: Description
The inverter contains a three-phase bridge circuit, which consists of 6 power transistors (IGBTs) each for the generator (MG1), motor (MG2) and rear motor (MGR). The inverter converts high-voltage direct current from the HV battery into three-phase alternating current for the generator (MG1), motor (MG2) and rear motor (MGR); it also converts three-phase alternating current supplied by generator (MG1), motor (MG2) and rear motor (MGR) 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.
HINT:
The term "drive motor A" indicates the motor (MG2).
The MG ECU uses an inverter voltage sensor, which is built into the inverter, to detect boosted high voltage (VH) to allow control of the voltage boost.
The inverter voltage sensor outputs voltage that fluctuates between 0 to 5 V according to changes in VH.
The MG ECU monitors the inverter voltage sensor and detects the following malfunctions.
| DTC No. | Detection Item | DTC Detection Condition | Trouble Area | MIL | Warning Indicate |
|---|---|---|---|---|---|
| P0A78-266 | Drive Motor "A" Inverter Performance | Inverter voltage (VH) signal is stuck low: DTC stored when the VH sensor signal is excessively low. (1 trip detection logic) |
Inverter with converter assembly | Comes on | Master Warning Light: Comes on |
| P0A78-267 | Drive Motor "A" Inverter Performance | Inverter voltage (VH) signal is stuck high: DTC stored when the VH sensor signal is excessively high. (1 trip detection logic) |
Inverter with converter assembly | Comes on | Master Warning Light: Comes on |
| DTC No. | Data List |
|---|---|
| P0A78-266 | VH-Voltage after Boosting |
| P0A78-267 |