- Open or short circuit in the generator resolver circuit
- Generator (MG1) internal malfunction (entry of foreign matter, etc.)
| Last Modified: 07-31-2024 | 6.11:8.1.0 | Doc ID: RM1000000026PWY |
| 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): P0A4B21,P0A1A47,P0A4B22,P1C2A49; Generator Position Sensor Signal Amplitude < Minimum; 2023 - 2025 MY Corolla HV [09/2022 - ] | ||
|
DTC |
P0A4B21 |
Generator Position Sensor Signal Amplitude < Minimum |
|
DTC |
P0A1A47 |
Generator Control Module Watchdog / Safety MC Failure |
|
DTC |
P0A4B22 |
Generator Position Sensor Signal Amplitude > Maximum |
|
DTC |
P1C2A49 |
Generator A/D Converter Circuit Internal Electronic Failure |
DTC SUMMARY
MALFUNCTION DESCRIPTION
These DTCs indicate that the resolver output signal is abnormal. The cause of this malfunction may be one of the following:
|
Area |
Main Malfunction Description |
|---|---|
|
Inverter low-voltage circuit |
The connectors are not connected properly |
|
Hybrid vehicle transaxle assembly |
|
|
Wire harness between the resolver and inverter with converter assembly |
|
|
Inside of inverter |
Inverter with converter assembly internal circuit malfunction |
DESCRIPTION
Refer to the system description for the Generator Resolver Circuit.
Click here
![2023 - 2025 MY Corolla HV [09/2022 - ]; HYBRID / BATTERY CONTROL: HYBRID CONTROL SYSTEM (for LITHIUM-ION BATTERY with PA10): Generator Resolver Circuit+](/t3Portal/stylegraphics/info.gif)
|
DTC No. |
Detection Item |
DTC Detection Condition |
Trouble Area |
MIL |
Warning Indicate |
Note |
|---|---|---|---|---|---|---|
|
P0A1A47 |
Generator Control Module Watchdog / Safety MC Failure |
Generator resolver malfunction or motor generator control ECU internal malfunction (1 trip detection logic) |
|
Comes on |
Master Warning: Comes on |
SAE Code: P0A1A |
|
P0A4B21 |
Generator Position Sensor Signal Amplitude < Minimum |
Open or short circuit in generator resolver circuit: The generator resolver signal is out of the standard range. (Signal amplitude is small) (1 trip detection logic) |
|
Comes on |
Master Warning: Comes on |
SAE Code: P0A4D |
|
P0A4B22 |
Generator Position Sensor Signal Amplitude > Maximum |
Open or short circuit in generator resolver circuit: The generator resolver signal is out of the standard range. (Signal amplitude is large) (1 trip detection logic) |
|
Comes on |
Master Warning: Comes on |
SAE Code: P0A4E |
|
P1C2A49 |
Generator A/D Converter Circuit Internal Electronic Failure |
Generator resolver malfunction or motor generator control ECU internal malfunction (1 trip detection logic) |
|
Comes on |
Master Warning: Comes on |
SAE Code: P1C2A |
MONITOR DESCRIPTION
The motor generator control ECU monitors the Generator resolver output signal. If the motor generator control ECU detects output signals that are out of the normal range or specification, it will conclude that there is a malfunction in the generator resolver, illuminate the MIL and store a DTC.
MONITOR STRATEGY
|
Related DTCs |
P0A1A (INF P0A1A47): Generator Control Module P0A4D (INF P0A4B21): Range check P0A4E (INF P0A4B22): Range check P1C2A (INF P1C2A49): Generator Control Module A/D Processing |
|
Required sensors/components |
Generator resolver |
|
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 P0A1A (INF P0A1A47) is not detected DTC P0A4D (INF P0A4B21) is not detected DTC P0A4E (INF P0A4B22) is not detected DTC P1C2A (INF P1C2A49) 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) with the shift lever in P and wait for 5 seconds or more. [*2]
- Depress the accelerator pedal of the vehicle with the engine stopped and the shift lever in P to start the engine. [*3]
- Drive the vehicle forward with the shift lever in D for 5 m (16 ft.) or more. [*4]
-
Drive the vehicle backward with the shift lever in R for 5 m (16 ft.) or more. [*5]
HINT:
[*1] to [*5]: 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 Generator Resolver 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
HINT:
- If the problem symptom cannot be reproduced, performing a road test on a road on which the vehicle tends to vibrate will make it easier to reproduce the symptom.
- If the resolver is malfunctioning, the vehicle may not drive smoothly.
- When inspecting the connectors, if it is difficult to judge if a connector was disconnected, deformed or improperly secured, disconnect and reconnect the connector and then check for DTCs again. Check if the same DTC is output. If the same DTC is not output, improper connection of connectors is suspected.
- As a malfunction detection threshold may be exceeded when performing the vibration or heat connector inspections, make sure to perform the following inspection to check that the DTC was not stored due to the malfunction of a part.
-
P0A1A47, P0A4B21, P0A4B22 or P1C2A49 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.)
Table 1
|
Malfunction Content |
System |
Relevant DTC |
|
|---|---|---|---|
|
Insulation malfunction |
Hybrid control system |
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 |
||
Table 2
|
Malfunction Content |
System |
Relevant DTC |
|
|---|---|---|---|
|
Microcomputer malfunction |
Motor generator control system |
P0A1A49 |
Generator Control Module Internal Electronic Failure |
|
P1C2A1C |
Generator A/D Converter Circuit Circuit Voltage Out of Range |
||
|
P1C2A71 |
Generator A/D Converter Circuit Actuator Stuck |
||
|
P1CAF38 |
Generator Position Sensor REF Signal Cycle Malfunction Signal Frequency Incorrect |
||
|
P313483 |
Communication Error from Drive Motor "A" to Generator Value of Signal Protection Calculation Incorrect |
||
|
P313486 |
Communication Error from Drive Motor "A" to Generator Signal Invalid |
||
|
P313487 |
Communication Error from Drive Motor "A" to Generator Missing Message |
||
|
Power source circuit malfunction |
Motor generator control system |
P19F81C |
Generator Control Module Offset Power Circuit Voltage Out of Range |
|
P26DF1C |
Generator Control Module Position Sensor REF Power Source Circuit Voltage Out of Range |
||
PROCEDURE
|
1. |
CHECK CONNECTOR CONNECTION CONDITION (INVERTER WITH CONVERTER ASSEMBLY CONNECTOR) |
Click here
|
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 |
|
|
2. |
CHECK GENERATOR RESOLVER CIRCUIT |
Click here
HINT:
If the "Generator Resolver Circuit" inspection results are normal, perform the next step.
| NEXT |
|
|
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