MALFUNCTION DESCRIPTION
The hybrid vehicle control ECU monitors the high-voltage wiring between the HV battery and inverter with converter assembly and detects an open circuit malfunction.
This DTC is differentiated from P1C8349 based on detection timing (after ignition switch is turned to ON (READY)). If P1C8349 is also output at the same time, first perform troubleshooting for P1C8349.
If there is a SMRG stuck open malfunction, only P1C8449 is output.
The cause of this malfunction may be one of the following:
Voltage sensor (VH) malfunction
Motor generator control ECU (MG ECU) malfunction
Communication (wire harness) 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
Hybrid vehicle control ECU malfunction
HV battery junction block assembly malfunction
Low voltage wire harness malfunction
Low voltage connector malfunction
Refer to the description for DTC P0AD911.
| DTC No. | Detection Item | DTC Detection Condition | Trouble Area | MIL | Warning Indicate | Note |
|---|---|---|---|---|---|---|
| P1C8449 | High Voltage Power Resource Circuit Short during Ready ON | High-voltage circuit malfunctions between the HV battery and inverter with converter assembly.
The voltage before boosting continues to be out of the HV battery voltage range or the integrated value of variation amount of the voltage before boosting for a specified period of time is large while the ignition switch is on (READY). The EV electric battery fuse is blown, the service plug grip is removed, SMRB or SMRG remains open, or the high-voltage cable has an open circuit. (1 trip detection logic) |
·
HV battery junction block assembly ·
Wire harness or connector ·
Hybrid vehicle control ECU |
Comes on | Master Warning:
Comes on |
SAE Code:
P3004 |
A malfunction is detected and the MIL is illuminated when the following condition is met:
A large fluctuation of DC/DC converter voltage has occurred due to power cable disconnection.
| Related DTCs | P3004 (INF P1C8449): Power Cable Malfunction |
| Required sensors/components | DC/DC converter, HV battery |
| Frequency of operation | - |
| Duration | TMC's intellectual property |
| MIL operation | 1 driving cycle |
| Sequence of operation | None |
| The monitor will run whenever the following DTCs are not stored | TMC's intellectual property |
| Other conditions belong to TMC's intellectual property | - |
| TMC's intellectual property | - |
| Hybrid vehicle control ECU | P3004 (INF P1C8449) is not detected |
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.
When clearing the permanent DTCs, refer to the "CLEAR PERMANENT DTC" procedure.
Connect the GTS to the DLC3.
Turn the ignition switch to ON and turn the GTS on.
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 turn the GTS on.
Turn the ignition switch to ON (READY) and wait for 3 minutes or more. [*1]
According to the display on the GTS, read the Data List and monitor the values of "Hybrid/EV Battery Voltage" and "VL-Voltage before Boosting" for 3 minutes. If the difference between "Hybrid/EV Battery Voltage" and "VL-Voltage before Boosting" is always less than 50 V, the vehicle has returned to normal.
[*1]: 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 / Hybrid Control / Utility / All Readiness.
Check the DTC judgment result.
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.
Refer to the wiring diagram for the HV Battery High-voltage Line Circuit.
Refer to the precautions before inspecting high voltage circuit.
After the ignition switch is turned off, there may be a waiting time before disconnecting the negative (-) auxiliary battery terminal.
When disconnecting and reconnecting the auxiliary battery
When disconnecting and reconnecting the auxiliary battery, there is an automatic learning function that completes learning when the respective system is used.
P1C8449 may be output as a result of the malfunction 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 | 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 | ||
| Motor generator control system | P0A1B1F | Generator Control Module Circuit Intermittent | |
| P0A1A47 | Generator Control Module Watchdog / Safety μC 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 | ||
| Hybrid battery system | P060687 | Hybrid/EV Battery Energy Control Module Processor to Monitoring Processor Missing Message | |
| P060A47 | Hybrid/EV Battery Energy Control Module Monitoring Processor Watchdog / Safety MCU Failure | ||
| P060A87 | Hybrid/EV Battery Energy Control Module Processor from Monitoring Processor Missing Message | ||
| P060B16 | Hybrid/EV Battery Energy Control Module A/D Processing Circuit Voltage Below Threshold | ||
| P060B49 | Hybrid/EV Battery Energy Control Module A/D Processing Internal Electronic Failure | ||
| Power source circuit malfunction | Motor generator control system | P06D61C | Generator Control Module Offset Power Circuit Voltage Out of Range |
| Hybrid battery system | P1CBB12 | Hybrid/EV Battery Current Sensor Power Supply Circuit Short to Auxiliary Battery | |
| P1CBB14 | Hybrid/EV Battery Current Sensor Power Supply Circuit Short to Ground or Open | ||
| Communication system malfunction | Hybrid control system | P312387 | Lost Communication with Drive Motor Control Module "A" from Hybrid/EV Control Module Missing Message |
| U011187 | Lost Communication with Hybrid/EV Battery Energy Control Module "A" Missing Message | ||
| Motor generator control system | P313387 | Communication Error from Generator to Drive Motor "A" Missing Message | |
| Sensor and actuator circuit malfunction | Hybrid control system | P0ABF00 | Hybrid/EV Battery Current Sensor "A" Circuit Range/Performance |
| P0AD911 | Hybrid/EV Battery Positive Contactor Circuit Short to Ground | ||
| P0AD915 | Hybrid/EV Battery Positive Contactor Circuit Short to Auxiliary Battery or Open | ||
| P0ADD11 | Hybrid/EV Battery Negative Contactor Circuit Short to Ground | ||
| P0ADD15 | Hybrid/EV Battery Negative Contactor Circuit Short to Auxiliary Battery or Open | ||
| 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 | ||
| Hybrid battery system | 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 | ||
| 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 | ||
| P0B0E11 | Hybrid/EV Battery Current Sensor "B" Circuit Short to Ground | ||
| P0B0E15 | Hybrid/EV Battery Current Sensor "B" Circuit Short to Auxiliary Battery or Open | ||
| P0B1362 | Hybrid/EV Battery Current Sensor "A"/"B" Signal Compare Failure | ||
| System malfunction | Hybrid control system | P0A1F94 | Hybrid/EV Battery Energy Control Module Unexpected Operation |
| P0D2D1C | Drive Motor "A" Inverter Voltage Sensor Voltage Out of Range | ||
| P0E311C | Boosting Converter Voltage Sensor "A" Voltage Out of Range | ||
| P1C2D62 | Hybrid/EV Battery "A" Voltage Sensor/Boosting Converter Voltage Sensor "A" Signal Compare Failure | ||
| P1C8349 | High Voltage Power Resource Circuit Voltage Sensor after Boosting Malfunction | ||
| P300449 | High Voltage Power Resource Circuit Short during Pre-Charge | ||
| Motor generator control system | P1CB69E | Drive Motor "A" Inverter Voltage Sensor(VH) Stuck On | |
| P0CA300 | DC/DC Converter Step Up Voltage Performance | ||
| Hybrid battery system | P300016 | Hybrid/EV Battery Control System Circuit Voltage Below Threshold | |
| Proceed to |
|---|
| NEXT |
NEXT
With the vehicle stopped, apply the parking brake and turn the ignition switch to ON (READY).
Perform this test with the AUTO function (shift-linked function) of the electric parking brake system off.
If the ignition switch could not be turned to ON (READY), turn the ignition switch off and check for DTCs after turning the ignition switch to ON (READY) again.
Because P300449 uses 2 trip detection logic, the DTC detection conditions need to be met 2 times.
When the parking brake indicator (red) is illuminated after the electric parking brake switch assembly has been pulled to the lock side, the maximum amount of braking force is applied if the electric parking brake switch assembly is pulled to the lock side one more time.
Ensure the safety of the areas in front and at the back of the vehicle.
Move the shift lever to D and depress both the accelerator pedal and brake pedal at the same time.
Depressing both the accelerator pedal and brake pedal at the same time causes the HV battery current to flow and ensures that there is no problem with the high-voltage wiring.
Check for DTCs.
| Result | Proceed to |
|---|---|
| P1C8449 is output, or no DTCs are output. | A |
| Ignition switch could not be turned to ON (READY) and DTC P1C8349 is output. | B |
| P0A9563 is also output. | C |
Turn the ignition switch off.
A
B
C
| Proceed to |
|---|
| OK |
| NG |
OK
NG
| 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 |
A
B
C
| Proceed to |
|---|
| OK |
| NG |
OK
NG
Be sure to wear insulated gloves.
Check that the service plug grip is not installed.
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.
Disconnect the HV battery junction block assembly connector.
Disconnect the hybrid vehicle control ECU connector.
Measure the resistance according to the value(s) in the table below.
| Tester Connection | Condition | Specified Condition |
|---|---|---|
| I278-3 (SMRB) - O219-4 (SMRB) | Ignition switch off | Below 1 Ω |
| I278-27 (SMRG) - O219-6 (SMRG) | Ignition switch off | Below 1 Ω |
Reconnect the hybrid vehicle control ECU connector.
Reconnect the HV battery junction block assembly connector.
| Proceed to |
|---|
| OK |
| NG |
OK
NG
Be sure to wear insulated gloves.
Check that the service plug grip is not installed.
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.
Disconnect the HV battery junction block assembly connector.
Measure the resistance according to the value(s) in the table below.
| Tester Connection | Condition | Specified Condition |
|---|---|---|
| O219-2 (GND) - Body ground | Ignition switch off | Below 1 Ω |
Reconnect the HV battery junction block assembly connector.
| Proceed to |
|---|
| OK |
| NG |
OK
NG
| Proceed to |
|---|
| NEXT |
NEXT
Be sure to wear insulated gloves.
Install the service plug grip.
Clear the DTCs.
Turn the ignition switch off and wait for 2 minutes or more.
| Proceed to |
|---|
| NEXT |
NEXT
Turn the ignition switch to ON (READY).
According to the display on the GTS, read the Data List and monitor the values of "Hybrid/EV Battery Voltage" and "VL-Voltage before Boosting" for 3 minutes.
| Tester Display |
|---|
| VL-Voltage before Boosting |
| Hybrid/EV Battery Voltage |
| Result | Proceed to |
|---|---|
| Difference between "Hybrid/EV Battery Voltage" and "VL-Voltage before Boosting" is always less than 50 V. | A |
| Difference between "Hybrid/EV Battery Voltage" and "VL-Voltage before Boosting" is 50 V or more. | B |
Turn the ignition switch off.
A
B