- Hybrid/EV Battery Voltage
- Hybrid/EV Battery Current
- VL-Voltage before Boosting
- VH-Voltage after Boosting
| Last Modified: 05-13-2024 | 6.11:8.1.0 | Doc ID: RM100000001GCM2 |
| Model Year Start: 2020 | Model: Corolla | Prod Date Range: [01/2019 - 09/2022] |
| Title: HYBRID / BATTERY CONTROL: HYBRID CONTROL SYSTEM (for NICKEL METAL HYDRIDE BATTERY): P1C8349; High Voltage Power Resource Circuit Voltage Sensor after Boosting Malfunction; 2020 - 2022 MY Corolla Corolla HV [01/2019 - 09/2022] | ||
|
DTC |
P1C8349 |
High Voltage Power Resource Circuit Voltage Sensor after Boosting Malfunction |
DTC SUMMARY
MALFUNCTION DESCRIPTION
The hybrid vehicle control ECU monitors the high-voltage wiring between the HV battery and inverter with converter assembly and detects a power supply malfunction.
The cause of this malfunction may be one of the following:
Inverter voltage sensor (VH) internal circuit malfunction
- Voltage sensor (VH) malfunction
- Motor generator control ECU (MG ECU) malfunction
- Communication (wire harness) malfunction
High voltage system malfunction
- HV battery malfunction
- HV battery junction block assembly malfunction
- Inverter with converter assembly malfunction
- High-voltage wire harness malfunction
- High-voltage connector or connection malfunction
Low-voltage circuit (12 V) malfunction
- Hybrid vehicle control ECU malfunction
- HV battery junction block assembly malfunction
- Low voltage wire harness malfunction
- Low voltage connector malfunction
INSPECTION DESCRIPTION
|
System Diagram Range |
Inspection Content |
Reason |
Inspection Step |
|---|---|---|---|
|
*a |
Check connection condition and wire harness continuity between hybrid vehicle control ECU and HV battery junction block assembly |
In order to check whether connectors are connected properly and to check for an open circuit in the SMRP and SMRB primary lines |
3 to 7 |
|
*b |
Check system main relay |
Check whether SMRB and SMRP stuck OFF |
8, 9 |
|
*c |
Check connection condition and high-voltage cable continuity between HV battery junction block assembly and inverter with converter assembly |
Check for open circuit and defective connection (arc marks) due to looseness |
10 to 12 |
|
*d |
Check high-voltage cable and connection condition between HV battery and HV battery junction block assembly |
Check for open circuit and defective connection (arc marks) due to looseness |
13, 14, 15, 16, 21 |
|
*e |
Check HV battery |
Check whether HV battery voltage has drastically dropped below normal range |
17 |
DESCRIPTION
Refer to the description for DTC P0AE411.
Click here
![2020 - 2022 MY Corolla Corolla HV [01/2019 - 09/2022]; HYBRID / BATTERY CONTROL: HYBRID CONTROL SYSTEM (for NICKEL METAL HYDRIDE BATTERY): P0AE411; Hybrid/EV Battery Precharge Contactor Circuit Short to Ground+](/t3Portal/stylegraphics/info.gif)
|
DTC No. |
Detection Item |
DTC Detection Condition |
Trouble Area |
MIL |
Warning Indicate |
|---|---|---|---|---|---|
|
P1C8349 |
High Voltage Power Resource Circuit Voltage Sensor after Boosting Malfunction |
Although an SMR on request was sent when the power switch is operated, the voltage did not increase after boosting. High-voltage circuit malfunctions between the HV battery and inverter with converter assembly. The EV electric battery fuse is blown, the service plug grip is removed, the system main resistor is blown, SMRP or SMRB remains open, or the high-voltage cable has an open circuit. (1 trip detection logic) |
|
Does not come on |
Master Warning: Comes on |
Related Data List
|
DTC No. |
Data List |
|---|---|
|
P1C8349 |
|
The following items can be helpful when performing repairs:
Data List
- Ready Signal
- Inter Lock Switch
- SMRP Status
- SMRB Status
- SMRG Status
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
- Connect the Techstream to the DLC3.
- Turn the power switch on (IG) and turn the Techstream on.
- Clear the DTCs (even if no DTCs are stored, perform the clear DTC procedure).
- Turn the power switch off and wait for 2 minutes or more.
- Turn the power switch on (READY) and wait for 30 seconds or more.
- Turn the power switch off and wait for 2 minutes or more.
- Turn the power switch on (IG) and turn the Techstream on.
- Enter the following menus: Powertrain / Hybrid Control / 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 or N/A, perform driving pattern again.
WIRING DIAGRAM
Refer to the wiring diagram for DTC P0AA649.
Click here
Refer to the wiring diagram for the HV Battery High-voltage Line Circuit.
Click here
CAUTION / NOTICE / HINT
CAUTION:
-
Before the following operations are conducted, take precautions to prevent electric shock by turning the power switch off, wearing insulated gloves, and removing the service plug grip from HV battery.
- Inspecting the high-voltage system
- Disconnecting the low voltage connector of the inverter with converter assembly
- Disconnecting the low voltage connector of the HV battery
-
To prevent electric shock, make sure to remove the service plug grip to cut off the high voltage circuit before servicing the vehicle.
-
After removing the service plug grip from the HV battery, 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.
Click here
HINT:
Waiting for at least 10 minutes is required to discharge the high-voltage capacitor inside the inverter with converter assembly.
*a
Without waiting for 10 minutes
-
When disposing of an HV battery, make sure to return it through an authorized collection agent who is capable of handling it safely. If the HV battery is returned via the manufacturer specified route, it will be returned properly and in a safe manner by an authorized collection agent.
*a
Dealer
*b
Battery Collection Agent
- Accidents such as electric shock may result if the HV battery is disposed of improperly or abandoned. Therefore, make sure to return all HV batteries through an authorized collection agent.
-
After removing the HV battery, keep it away from water. Exposure to water may cause the HV battery to produce heat, resulting in a fire.
NOTICE:
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.
Click here
PROCEDURE
|
1. |
CHECK DTC OUTPUT (HYBRID CONTROL, MOTOR GENERATOR) |
(a) Connect the Techstream to the DLC3.
(b) Turn the power switch on (IG).
(c) Enter the following menus: Powertrain / Hybrid Control and Motor Generator / Trouble Codes.
(d) Check for DTCs.
Powertrain > Hybrid Control > Trouble Codes
Powertrain > Motor Generator > Trouble Codes
|
Result |
Proceed to |
|---|---|
|
P1C8349 only is output, or DTCs except the ones in the table below are also output. |
A |
|
DTCs of hybrid control system in the tables below are output. |
B |
|
DTCs of motor generator control system in the tables below are output. |
C |
|
Malfunction Content |
System |
Relevant DTC |
|
|---|---|---|---|
|
Microcomputer malfunction |
Hybrid control system |
P0A1B49 |
Drive Motor "A" Control Module Internal Electronic Failure |
|
P060647 |
Hybrid/EV Powertrain Control Module Processor Watchdog / Safety MCU Failure |
||
|
P060687 |
Hybrid/EV Powertrain Control Module Processor to Monitoring Processor Missing Message |
||
|
P060A47 |
Hybrid/EV Powertrain Control Module Monitoring Processor Watchdog / Safety MCU Failure |
||
|
P060A87 |
Hybrid/EV Powertrain Control Module Processor from Monitoring Processor Missing Message |
||
|
P1C9E9F |
Hybrid/EV System Reset Stuck Off |
||
|
P0AFC96 |
Hybrid/EV Battery Sensor Module Component Internal Failure |
||
|
P0AFC00 |
Hybrid/EV Battery Sensor Module |
||
|
Motor generator control system |
P0A1B1F |
Generator Control Module Circuit Intermittent |
|
|
P0A1A47 |
Generator Control Module Watchdog / Safety MC Failure |
||
|
P0A1A49 |
Generator Control Module Internal Electronic Failure |
||
|
P1C2A1C |
Generator A/D Converter Circuit Circuit Voltage Out of Range |
||
|
P1C2A49 |
Generator A/D Converter Circuit Internal Electronic Failure |
||
|
P313383 |
Communication Error from Generator to Drive Motor "A" Value of Signal Protection Calculation Incorrect |
||
|
P313386 |
Communication Error from Generator to Drive Motor "A" Signal Invalid |
||
|
P313387 |
Communication Error from Generator to Drive Motor "A" Missing Message |
||
|
Power source circuit malfunction |
Hybrid control system |
P0AFC16 |
Hybrid/EV Battery Sensor Module Circuit Voltage Below Threshold |
|
Motor generator control system |
P06D61C |
Generator Control Module Offset Power Circuit Voltage Out of Range |
|
|
Communication system malfunction |
Hybrid control system |
P312387 |
Lost Communication with Drive Motor Control Module "A" from Hybrid/EV Control Module Missing Message |
|
U029A87 |
Lost Communication with Hybrid/EV Battery Sensor Module Missing Message |
||
|
Sensor and actuator circuit malfunction |
Hybrid control system |
P0AD915 |
Hybrid/EV Battery Positive Contactor Circuit Short to Auxiliary Battery or Open |
|
P0AD911 |
Hybrid/EV Battery Positive Contactor Circuit Short to Ground |
||
|
P0AE415 |
Hybrid/EV Battery Precharge Contactor Circuit Short to Auxiliary Battery or Open |
||
|
P0AE411 |
Hybrid/EV Battery Precharge Contactor Circuit Short to Ground |
||
|
P0ADD15 |
Hybrid/EV Battery Negative Contactor Circuit Short to Auxiliary Battery or Open |
||
|
P0ADD11 |
Hybrid/EV Battery Negative Contactor Circuit Short to Ground |
||
|
P0ABF11 |
Hybrid/EV Battery Current Sensor "A" Circuit Short to Ground |
||
|
P0ABF15 |
Hybrid/EV Battery Current Sensor "A" Circuit Short to Auxiliary Battery or Open |
||
|
P0B3B14 |
Hybrid/EV Battery Voltage Sensor "A" Circuit Short to Ground or Open |
||
|
P0B4014 |
Hybrid/EV Battery Voltage Sensor "B" Circuit Short to Ground or Open |
||
|
P0B4514 |
Hybrid/EV Battery Voltage Sensor "C" Circuit Short to Ground or Open |
||
|
P0B4A14 |
Hybrid/EV Battery Voltage Sensor "D" Circuit Short to Ground or Open |
||
|
P0B4F14 |
Hybrid/EV Battery Voltage Sensor "E" Circuit Short to Ground or Open |
||
|
P0B5414 |
Hybrid/EV Battery Voltage Sensor "F" Circuit Short to Ground or Open |
||
|
P0B5914 |
Hybrid/EV Battery Voltage Sensor "G" Circuit Short to Ground or Open |
||
|
P0B5E14 |
Hybrid/EV Battery Voltage Sensor "H" Circuit Short to Ground or Open |
||
|
P0B6314 |
Hybrid/EV Battery Voltage Sensor "I" Circuit Short to Ground or Open |
||
|
P0B6814 |
Hybrid/EV Battery Voltage Sensor "J" Circuit Short to Ground or Open |
||
|
P308A13 |
Hybrid/EV Battery Voltage Sensor All Circuit Open |
||
|
P0AFC62 |
Hybrid/EV Battery Sensor Module Signal Compare Failure |
||
|
P0B231C |
Hybrid/EV Battery "A" Voltage Sensor Voltage Out of Range |
||
|
P308A12 |
Hybrid/EV Battery Voltage Sensor All Circuit Short to Auxiliary Battery |
||
|
P0ABF00 |
Hybrid/EV Battery Current Sensor "A" Circuit Range/Performance |
||
|
P0ABF28 |
Hybrid/EV Battery Current Sensor "A" Signal Bias Level Out of Range / Zero Adjustment Failure |
||
|
P0ABF2A |
Hybrid/EV Battery Current Sensor "A" Signal Stuck In Range |
||
|
System malfunction |
Hybrid control system |
P0C7600 |
Hybrid/EV Battery System Discharge Time Too Long |
|
P0D2D1C |
Drive Motor "A" Inverter Voltage Sensor Voltage Out of Range |
||
|
P1C8149 |
High Voltage Power Resource Circuit Consumption Circuit Short |
||
|
P1C8249 |
High Voltage Power Resource Circuit Over Loading |
||
|
P300449 |
High Voltage Power Resource Circuit Short during Pre-Charge |
||
|
Motor generator control system |
P0D2D16 |
Drive Motor "A" Inverter Voltage Sensor(VH) Circuit Voltage Below Threshold |
|
|
P0D2D17 |
Drive Motor "A" Inverter Voltage Sensor(VH) Circuit Voltage Above Threshold |
||
|
P1CB69E |
Drive Motor "A" Inverter Voltage Sensor(VH) Stuck On |
||
|
P0CA300 |
DC/DC Converter Step Up Voltage Performance |
||
HINT:
-
P1C8349 may be output as a result of the malfunction indicated by the DTCs above.
- 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.)
(e) Turn the power switch off.
| B |
|
GO TO DTC CHART (HYBRID CONTROL SYSTEM)
|
| C |
|
|
|
2. |
CHECK FREEZE FRAME DATA (HYBRID CONTROL) |
(a) Connect the Techstream to the DLC3.
(b) Turn the power switch on (IG).
(c) Enter the following menus: Powertrain / Hybrid Control / Trouble Codes.
(d) Read the freeze frame data of DTC P1C8349.
|
Result |
Proceed to |
|---|---|
|
All of the following conditions are met:
|
A |
|
In addition to the above conditions, "Hybrid/EV Battery Current" is 3 A or more. |
B |
|
Except above |
C |
(e) Turn the power switch off.
| A |
|
REPLACE INVERTER WITH CONVERTER ASSEMBLY
|
| B |
|
|
|
3. |
CHECK CONNECTOR CONNECTION CONDITION (HYBRID VEHICLE CONTROL ECU CONNECTOR) |
Click here
| NG |
|
CONNECT SECURELY |
|
|
4. |
CHECK CONNECTOR CONNECTION CONDITION (FLOOR WIRE 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 |
|
|
5. |
CHECK CONNECTOR CONNECTION CONDITION (HV BATTERY JUNCTION BLOCK ASSEMBLY CONNECTOR) |
Click here
| NG |
|
CONNECT SECURELY |
|
|
6. |
CHECK HARNESS AND CONNECTOR (HYBRID VEHICLE CONTROL ECU - HV BATTERY JUNCTION BLOCK ASSEMBLY) |
Click here
| NG |
|
REPAIR OR REPLACE HARNESS OR CONNECTOR |
|
|
7. |
CHECK HARNESS AND CONNECTOR (HV BATTERY JUNCTION BLOCK ASSEMBLY - BODY GROUND) |
Click here
| NG |
|
REPAIR OR REPLACE HARNESS OR CONNECTOR |
|
|
8. |
INSPECT HV BATTERY JUNCTION BLOCK ASSEMBLY (SMRB) |
Click here
| NG |
|
|
|
9. |
INSPECT HV BATTERY JUNCTION BLOCK ASSEMBLY (SMRP) |
Click here
| NG |
|
|
|
10. |
CHECK INVERTER WITH CONVERTER ASSEMBLY (HV FLOOR UNDER WIRE CONNECTION CONDITION) |
Click here
|
Result |
Proceed to |
|
|---|---|---|
|
The terminals are connected securely and there are no contact problems. |
There are no arc marks. |
A |
|
The terminals are not connected securely and there is a contact problem. |
There are arc marks. |
B |
|
The terminals are not connected securely and there is a contact problem. |
There are no arc marks. |
C |
|
The terminals are connected securely and there are no contact problems. |
There are arc marks. |
B |
| B |
|
REPLACE MALFUNCTIONING PARTS |
| C |
|
CONNECT SECURELY |
|
|
11. |
CHECK HV BATTERY JUNCTION BLOCK ASSEMBLY (HV FLOOR UNDER WIRE CONNECTION CONDITION) |
Click here
|
Result |
Proceed to |
|
|---|---|---|
|
The terminals are connected securely and there are no contact problems. |
There are no arc marks. |
A |
|
The terminals are not connected securely and there is a contact problem. |
There are arc marks. |
B |
|
The terminals are not connected securely and there is a contact problem. |
There are no arc marks. |
C |
|
The terminals are connected securely and there are no contact problems. |
There are arc marks. |
B |
| B |
|
REPLACE MALFUNCTIONING PARTS |
| C |
|
CONNECT SECURELY |
|
|
12. |
CHECK FLOOR UNDER WIRE |
Click here
| NG |
|
REPLACE FLOOR UNDER WIRE
|
|
|
13. |
CHECK HV BATTERY JUNCTION BLOCK ASSEMBLY (HV BATTERY HIGH VOLTAGE CONNECTOR CONNECTION CONDITION) |
Click here
|
Result |
Proceed to |
|
|---|---|---|
|
The terminals are connected securely and there are no contact problems. |
There are no arc marks. |
A |
|
The terminals are not connected securely and there is a contact problem. |
There are arc marks. |
B |
|
The terminals are not connected securely and there is a contact problem. |
There are no arc marks. |
C |
|
The terminals are connected securely and there are no contact problems. |
There are arc marks. |
B |
| B |
|
REPLACE MALFUNCTIONING PARTS |
| C |
|
CONNECT SECURELY |
|
|
14. |
CHECK HYBRID BATTERY TERMINAL BLOCK (HV BATTERY HIGH VOLTAGE CONNECTOR CONNECTION CONDITION) |
Click here
|
Result |
Proceed to |
|
|---|---|---|
|
The terminals are connected securely and there are no contact problems. |
There are no arc marks. |
A |
|
The terminals are not connected securely and there is a contact problem. |
There are arc marks. |
B |
|
The terminals are not connected securely and there is a contact problem. |
There are no arc marks. |
C |
|
The terminals are connected securely and there are no contact problems. |
There are arc marks. |
B |
| B |
|
REPLACE MALFUNCTIONING PARTS |
| C |
|
CONNECT SECURELY |
|
|
15. |
CHECK HV BATTERY HIGH VOLTAGE CABLE |
Click here
| NG |
|
|
|
16. |
CHECK HV BATTERY HIGH VOLTAGE CABLE |
Click here
| NG |
|
|
|
17. |
CHECK HV BATTERY |
Click here
| NG |
|
|
|
18. |
CHECK FOR INTERMITTENT PROBLEMS |
Click here
|
|
19. |
CLEAR DTC |
Click here
|
|
20. |
CHECK DTC OUTPUT (HYBRID CONTROL) |
(a) Connect the Techstream to the DLC3.
(b) Turn the power switch on (READY).
(c) Enter the following menus: Powertrain / Hybrid Control / Trouble Codes.
(d) Check if DTCs are output (including pending DTCs).
Powertrain > Hybrid Control > Trouble Codes
Result |
Proceed to |
|---|---|
No DTCs are output. |
A |
DTC P300449 is output. |
B |
DTC P1C8349 is output. |
C |
HINT:
Because P300449 uses 2-trip detection logic, the DTC detection conditions need to be met 2 times.
(e) Turn the power switch off.
| A |
|
REPLACE INVERTER WITH CONVERTER ASSEMBLY
|
| B |
|
| C |
|
REPLACE INVERTER WITH CONVERTER ASSEMBLY
|
|
21. |
CHECK HYBRID BATTERY TERMINAL BLOCK |
Click here
| OK |
|
| NG |
|
|
|