HYBRID CONTROL SYSTEM, Diagnostic DTC:P0A78-282
| DTC Code | DTC Name |
|---|---|
| P0A78-282 | Drive Motor "A" Inverter Performance |
DTC SUMMARY
MALFUNCTION DESCRIPTION
This DTC indicates a malfunction inside the inverter for the motor. The cause of this malfunction may be one of the following:
Internal inverter malfunction
Internal circuit malfunction in the inverter for the motor
Malfunction in the sensors for inverter control (current sensor, voltage sensors (VH, VL), etc.)
DESCRIPTION
For a description of the inverter.
If an overvoltage occurs in the motor inverter or generator inverter, the MG ECU detects it and transmits this information to the hybrid vehicle control ECU.
The term "drive motor A" indicates the motor (MG2).
DTC No. |
Detection Item |
DTC Detection Condition |
Trouble Area |
MIL |
Warning Indicate |
|---|---|---|---|---|---|
P0A78-282 |
Drive Motor "A" Inverter Performance |
Motor inverter overvoltage signal detected (circuit malfunction) (1 trip detection logic) |
|
Comes on |
Master Warning Light: Comes on |
DTC No. |
Data List |
|---|---|
P0A78-282 |
VH-Voltage after Boosting |
CAUTION / NOTICE / HINT
Before inspecting the high-voltage system or disconnecting the low voltage connector of the inverter with converter assembly, 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.
Tip:Waiting for at least 10 minutes is required to discharge the high-voltage capacitor inside the inverter with converter assembly.
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.
After the repair, clear the DTCs and perform the following procedure to check that DTCs are not output.
With the engine stopped, the power switch on (READY) and the shift lever in P, depress the accelerator pedal to start the engine.
PROCEDURE
CHECK DTC OUTPUT (HYBRID CONTROL)
Connect the GTS to the DLC3.
Turn the power switch on (IG).
Enter the following menus: Powertrain / Hybrid Control / Trouble Codes.
Check for DTCs.
Powertrain > Hybrid Control > Trouble Codes
Result
Result
Proceed to
P0A78-282 is stored before any of the DTCs in the table below are stored.
A
Any of the DTCs in the table below are stored before P0A78-282 is stored.
B
Relevant DTC
P3000-388, 389, 603
Battery Control System
P3004-131, 133
High Voltage Power Resource
Tip:P0A78-282 may be output as a result of the malfunction indicated by the DTCs above.
If a DTC in the preceding table is stored during READY ON, the system will turn off the System Main Relay and an overvoltage condition may occur.
Turn the power switch off.
CHECK CONNECTOR CONNECTION CONDITION (INVERTER WITH CONVERTER ASSEMBLY CONNECTOR)
Result
Result
Proceed to
OK
A
NG (The connector is not connected securely.)
B
NG (The terminals are not making secure contact or are deformed, or water or foreign matter exists in the connector.)
C
B CONNECT SECURELY
C REPAIR OR REPLACE HARNESS OR CONNECTOR