СИСТЕМА УПРАВЛЕНИЯ ГИБРИДНОЙ СИСТЕМОЙ, Diagnostic DTC:P0A78-266, P0A78-267

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 generator (MG1) and motor (MG2). The inverter converts high-voltage direct current from the HV battery into three-phase alternating current for generator (MG1) and motor (MG2); it also converts three-phase alternating current supplied by generator (MG1) and motor (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.

Tech Tips

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

A01FU96E03

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. DTC Detection Condition Trouble Area
P0A78-266

Inverter voltage (VH) signal is stuck low

Stores a DTC when the VH sensor signal is excessively low.

(1 trip detection logic)

 Inverter with converter assembly
P0A78-267

Inverter voltage (VH) signal is stuck high

Stores a DTC when the VH sensor signal is excessively high.

(1 trip detection logic)
Related Data List
DTC No. Data List
P0A78-266 VH-Voltage after Boosting
P0A78-267

INSPECTION PROCEDURE

Tech Tips

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


  1. Turn the power switch on (READY) and wait for 5 seconds or more.

PROCEDURE


  1. REPLACE INVERTER WITH CONVERTER ASSEMBLY

    Click here

    Tech Tips

    The signal line from the inverter voltage (VH) sensor is connected to the MG ECU, which is built into the inverter with converter assembly. If P0A78-266 or P0A78-267 is output, replace the inverter with converter assembly.


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    COMPLETED