| Last Modified: 05-13-2024 | 6.11:8.1.0 | Doc ID: RM1000000026PX1 |
| Model Year Start: 2023 | Model: Corolla HV | Prod Date Range: [09/2022 - ] |
| Title: HYBRID / BATTERY CONTROL: MOTOR GENERATOR CONTROL SYSTEM (for LITHIUM-ION BATTERY with PA10): P0A7873; Drive Motor "A" Inverter Actuator Stuck Closed; 2023 - 2025 MY Corolla HV [09/2022 - ] | ||
|
DTC |
P0A7873 |
Drive Motor "A" Inverter Actuator Stuck Closed |
DTC SUMMARY
MALFUNCTION DESCRIPTION
This DTC is stored when a short is detected in the inverter with converter assembly (motor inverter) or the hybrid vehicle transaxle assembly (motor (MG2)). The cause of this malfunction may be one of the following:
Internal inverter malfunction
- Motor inverter internal circuit malfunction
Hybrid vehicle transaxle assembly (motor (MG2)) malfunction
- Open or short circuit
- Iron particles or damage from foreign objects
DESCRIPTION
For a description of the inverter.
Click here
![2023 - 2025 MY Corolla HV [09/2022 - ]; HYBRID / BATTERY CONTROL: MOTOR GENERATOR CONTROL SYSTEM (for LITHIUM-ION BATTERY with PA10): P0D2D16,...,P0D2D1F; Drive Motor "A" Inverter Voltage Sensor(VH) Circuit Voltage Below Threshold+](/t3Portal/stylegraphics/info.gif)
|
DTC No. |
Detection Item |
DTC Detection Condition |
Trouble Area |
MIL |
Warning Indicate |
Note |
|---|---|---|---|---|---|---|
|
P0A7873 |
Drive Motor "A" Inverter Actuator Stuck Closed |
Current flow to any phase of the motor (MG2) exceeds the threshold after the motor inverter is shut down due to a DTC indicating a motor inverter malfunction (overheating, overcurrent or circuit malfunction) being stored. (1 trip detection logic) |
|
Comes on |
Master Warning: Comes on |
SAE Code: P0A78 |
MONITOR DESCRIPTION
The motor generator control ECU monitors the motor inverter electric current. If the current exceeds the threshold for a specified period of time, the motor generator control ECU will illuminate the MIL and store a DTC.
MONITOR STRATEGY
|
Related DTCs |
P0A78 (INF P0A7873): MFIV detection (Short circuit malfunction) |
|
Required sensors/components |
Motor inverter |
|
Frequency of operation |
Continuous |
|
Duration |
TMC's intellectual property |
|
MIL operation |
1 driving cycle |
|
Sequence of operation |
None |
TYPICAL ENABLING CONDITIONS
|
The monitor will run whenever the following DTCs are not stored |
TMC's intellectual property |
|
Other conditions belong to TMC's intellectual property |
- |
TYPICAL MALFUNCTION THRESHOLDS
|
TMC's intellectual property |
- |
COMPONENT OPERATING RANGE
|
Motor generator control ECU |
DTC P0A78 (INF P0A7873) is not detected |
CONFIRMATION DRIVING PATTERN
HINT:
-
After repair has been completed, clear the DTC and then check that the vehicle has returned to normal by performing the following All Readiness check procedure.
Click here
-
When clearing the permanent DTCs, refer to the "CLEAR PERMANENT DTC" procedure.
Click here
- Clear the DTCs (even if no DTCs are stored, perform the clear DTC procedure).
- Turn the ignition switch off and wait for 2 minutes or more.
- Turn the ignition switch to ON and wait for 5 seconds or more. [*1]
- Turn the ignition switch to ON (READY) and wait for 5 seconds or more. [*2]
-
Drive the vehicle for approximately 10 minutes mainly using the engine. [*3]
NOTICE:
As the state of charge of the HV battery may be low after driving in fail-safe mode, it will automatically be charged for 5 to 10 minutes with ignition switch ON (READY) after repairs have been performed.
HINT:
[*1] to [*3]: Normal judgment procedure.
The normal judgment procedure is used to complete DTC judgment and also used when clearing permanent DTCs.
- Enter the following menus: Powertrain / Motor Generator / Utility / All Readiness.
-
Check the DTC judgment result.
HINT:
- If the judgment result shows NORMAL, the system is normal.
- If the judgment result shows ABNORMAL, the system has a malfunction.
- If the judgment result shows INCOMPLETE, perform the normal judgment procedure again.
WIRING DIAGRAM
Refer to the wiring diagram for the Motor High-voltage Circuit.
Click here
CAUTION / NOTICE / HINT
CAUTION:
Refer to the precautions before inspecting high voltage circuit.
Click here
NOTICE:
-
After the ignition switch is turned off, there may be a waiting time before disconnecting the negative (-) auxiliary battery terminal.
Click here
-
When disconnecting and reconnecting the auxiliary battery.
HINT:
When disconnecting and reconnecting the auxiliary battery, there is an automatic learning function that completes learning when the respective system is used.
Click here
- DTC P0A7873 is stored after DTCs P0A789E and/or P1C5D19 are stored. After troubleshooting and repairing the malfunction which caused DTC P0A7873 to be stored, be sure to troubleshoot the other DTCs.
- Depending on the conditions in which the vehicle is being operated when a short circuit occurs in the inverter with converter assembly, the hybrid vehicle transaxle assembly may be affected. As this DTC is stored if a short circuit occurs in the inverter with converter assembly, it is necessary to perform a road test to check the hybrid vehicle transaxle assembly. If problems are found, replace the malfunctioning parts.
- After completing the repair, including the repair of previously output DTCs, drive the vehicle at a speed of approximately 40 km/h (25 mph) for 1 minute and check that DTC P0A9000 is not output. If DTC P0A9000 is output, replace the hybrid vehicle transaxle assembly.
HINT:
-
P0A7873 may be output as a result of the malfunctions indicated by the DTCs in table below.
- The chart above is listed in inspection order of priority.
- Check DTCs that are output at the same time by following the listed order. (The main cause of the malfunction can be determined without performing unnecessary inspections.)
|
Malfunction Content |
Relevant DTC |
|
|---|---|---|
|
Insulation malfunction |
P1C7C49 |
Hybrid/EV Battery Voltage System Isolation (A/C Area) Internal Electronic Failure |
|
P1C7D49 |
Hybrid/EV Battery Voltage System Isolation (Hybrid/EV Battery Area) Internal Electronic Failure |
|
|
P1C7E49 |
Hybrid/EV Battery Voltage System Isolation (Transaxle Area) Internal Electronic Failure |
|
|
P1C7F49 |
Hybrid/EV Battery Voltage System Isolation (Direct Current Area) Internal Electronic Failure |
|
|
P1C8049 |
Hybrid/EV Battery Voltage System Isolation (Rear Motor Area) Internal Electronic Failure |
|
PROCEDURE
|
1. |
CHECK HYBRID VEHICLE TRANSAXLE ASSEMBLY (MOTOR (MG2)) |
CAUTION:
Be sure to wear insulated gloves.
(a) Check that the service plug grip is not installed.
NOTICE:
After removing the service plug grip, do not turn the ignition switch to ON (READY), unless instructed by the repair manual because this may cause a malfunction.
(b) Disconnect the motor cable from the hybrid vehicle transaxle assembly.
|
(c) Check the motor (MG2) for an interphase short using a milliohmmeter. (1) Using a milliohmmeter, measure the resistance according to the value(s) in the table below. HINT: If the motor (MG2) temperature is high, the resistance will vary greatly from the specification. Therefore, measure the resistance at least 8 hours after the vehicle has been stopped. Standard Resistance:
HINT: To correct the variation of the measured resistance due to temperature, use the following formula to calculate the resistance at 20°C (68°F).
The calculation is based on the following:
|
|
(d) Using a megohmmeter set to 500 V, measure the resistance according to the value(s) in the table below.
NOTICE:
Be sure to set the megohmmeter to 500 V when performing this test. Using a setting higher than 500 V can result in damage to the component being inspected.
Standard Resistance:
|
Tester Connection |
Condition |
Specified Condition |
|---|---|---|
|
p3-1 (W) - Body ground and shield ground |
Ignition switch off |
100 MΩ or higher |
|
p3-2 (U) - Body ground and shield ground |
Ignition switch off |
100 MΩ or higher |
|
p3-3 (V) - Body ground and shield ground |
Ignition switch off |
100 MΩ or higher |
(e) Connect the motor cable.
| NG |
|
|
|
2. |
REPLACE INVERTER WITH CONVERTER ASSEMBLY |
Click here
|
|
3. |
REPLACE MOTOR CABLE |
Click here
| NEXT |
|
|
4. |
REPLACE HYBRID VEHICLE TRANSAXLE ASSEMBLY |
Click here
|
|
5. |
REPLACE INVERTER WITH CONVERTER ASSEMBLY |
Click here
|
|
6. |
REPLACE MOTOR CABLE |
Click here
|
|
7. |
CHECK DTC OUTPUT (MOTOR GENERATOR) |
(a) Check the other DTCs that were output together with DTC P0A7873.
Powertrain > Motor Generator > Trouble Codes
|
Relevant DTC |
|
|---|---|
|
P0A789E |
Drive Motor "A" Inverter Stuck On |
|
P1C5D19 |
Drive Motor "A" Inverter Circuit Current Above Threshold |
NOTICE:
DTC P0A7873 is stored after DTCs P0A789E and/or P1C5D19 are stored. After troubleshooting and repairing the malfunction which caused P0A7873 to be stored, be sure to troubleshoot the other DTCs.
| NEXT |
|
GO TO DTC CHART (MOTOR GENERATOR CONTROL SYSTEM) |
|
|