- Difference between "Hybrid/EV Battery Voltage" and "VH-Voltage after Boosting" is less than 5 V.
- Difference between "VL-Voltage before Boosting" and "VH-Voltage after Boosting" is more than 30 V.
| Last Modified: 07-31-2024 | 6.11:8.1.0 | Doc ID: RM1000000026PU3 |
| Model Year Start: 2023 | Model: Corolla HV | Prod Date Range: [09/2022 - ] |
| Title: HYBRID / BATTERY CONTROL: HYBRID CONTROL SYSTEM (for LITHIUM-ION BATTERY with PA10): P1C2D62; Hybrid/EV Battery "A" Voltage Sensor/Boosting Converter Voltage Sensor "A" Signal Compare Failure; 2023 - 2025 MY Corolla HV [09/2022 - ] | ||
|
DTC |
P1C2D62 |
Hybrid/EV Battery "A" Voltage Sensor/Boosting Converter Voltage Sensor "A" Signal Compare Failure |
DTC SUMMARY
MALFUNCTION DESCRIPTION
The hybrid vehicle control ECU detects a VB sensor or VL sensor malfunction.
The cause of this malfunction may be one of the following:
Inverter voltage (VB or VL) sensor internal circuit malfunction
- Voltage sensor 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
Inspection Overview
|
Inspection Content |
Reason (Narrow Down in Order Using Inspection Procedures Below) |
|---|---|
|
Check for DTCs (hybrid control, motor generator, HV battery) |
Output DTCs |
|
Check for DTCs (check voltage sensor malfunction locations) Check for DTCs (drive test) |
Ignition switch ON (READY) (vehicle stopped or being driven) and then check whether DTCs are output again. |
|
Read value using GTS (data list) |
Data List value |
|
Check freeze frame data |
Freeze Frame Data |
|
Read value using GTS (data list) |
Accelerator and brake pedal simultaneously depressed Data List value |
DESCRIPTION
For a description of the boost converter.
Click here
![2023 - 2025 MY Corolla HV [09/2022 - ]; HYBRID / BATTERY CONTROL: MOTOR GENERATOR CONTROL SYSTEM (for LITHIUM-ION BATTERY with PA10): P0CA300; DC/DC Converter Step Up Voltage Performance+](/t3Portal/stylegraphics/info.gif)
The MG ECU uses a voltage sensor (VL) that is built into the boost converter to detect the high voltage before it is boosted. The ECU also uses the battery ECU assembly to detect HV battery voltage (VB).
|
DTC No. |
Detection Item |
DTC Detection Condition |
Trouble Area |
MIL |
Warning Indicate |
Note |
|---|---|---|---|---|---|---|
|
P1C2D62 |
Hybrid/EV Battery "A" Voltage Sensor/Boosting Converter Voltage Sensor "A" Signal Compare Failure |
Voltages from HV battery voltage (VB) sensor and boost converter voltage (VL) sensor deviate: Difference between "VL-Voltage before Boosting" and "Hybrid/EV Battery Voltage" is large when the boosting request is given. (1 trip detection logic) |
|
Comes on |
Master Warning: Comes on |
SAE Code: P1C2D |
MONITOR DESCRIPTION
The hybrid vehicle control ECU monitors signals of HV battery voltage (VB) and boost converter voltage (VL) sensors. When a large difference occurs between the voltages from the VB and VL sensors, the hybrid vehicle control ECU interprets this as a failure of either of the sensors. The hybrid vehicle control ECU will illuminate the MIL and store a DTC.
MONITOR STRATEGY
|
Related DTCs |
P1C2D (INF P1C2D62): Hybrid / EV battery voltage / DC/DC converter voltage correlation |
|
Required sensors/components |
Boost converter |
|
Frequency of operation |
- |
|
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
|
Hybrid vehicle control ECU |
DTC P1C2D (INF P1C2D62) 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
- 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). [*1]
- With the shift lever in D, depress both the accelerator pedal and brake pedal at the same time to raise the "Hybrid/EV Battery SOC" to a sufficient level. [*2]
- Move the shift lever to P, check that the engine is stopped and move the shift lever to N. [*3]
- Set the A/C for maximum cooling. [*4]
-
Leave the vehicle for a few minutes. [*5]
HINT:
- When the accelerator pedal is not depressed with the ignition switch ON (READY) and shift lever in P, if "VL-Voltage before Boosting" and the "Hybrid/EV Battery Voltage" is approximately the same after repair, the condition is judged as normal.
-
[*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 / 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, perform the normal judgment procedure again.
CAUTION / NOTICE / HINT
HINT:
-
P1C2D62 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 |
P060647 |
Hybrid/EV Powertrain Control Module Processor Watchdog / Safety MCU Failure |
|
P0A1B49 |
Drive Motor "A" Control Module Internal Electronic Failure |
||
|
P060B49 |
Hybrid/EV Powertrain Control Module A/D Processing Internal Electronic 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 |
||
|
Motor Generator Control System |
P0A1A47 |
Generator Control Module Watchdog / Safety μC Failure |
|
|
P0A1A49 |
Generator Control Module Internal Electronic Failure |
||
|
P0A1B1F |
Generator Control Module Circuit Intermittent |
||
|
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 |
P060B49 |
Hybrid/EV Battery Energy Control Module A/D Processing Internal Electronic Failure |
|
|
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 |
||
|
P0E2D00 |
Hybrid/EV Battery Energy Control Module Hybrid/EV Battery Monitor Performance |
||
|
Power source circuit malfunction |
Motor Generator Control System |
P06D61C |
Generator Control Module Offset Power Circuit Voltage Out of Range |
|
Communication system malfunction |
Hybrid Control System |
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 Battery System |
P301A1C |
Hybrid Battery Stack 1 Cell Voltage Detection Voltage Out of Range |
|
P1A001C |
Hybrid Battery Stack 2 Cell Voltage Detection Voltage Out of Range |
||
|
P1AFD1C |
Flying Capacitor/Internal Control Module Hybrid/EV Battery Monitor Voltage Out of Range |
||
|
System malfunction |
Motor Generator Control System |
P0E3116 |
DC/DC Converter Voltage Sensor "A" (VL) Circuit Voltage Below Threshold |
|
P0E3117 |
DC/DC Converter Voltage Sensor "A" (VL) Circuit Voltage Above Threshold |
||
PROCEDURE
|
1. |
CLEAR DTC |
Click here
|
|
2. |
CHECK DTC OUTPUT (CHECK FAILURE PART) |
(a) Apply the parking brake and secure the wheels using chocks.
NOTICE:
Perform this test with the AUTO function (shift-linked function) of the electric parking brake system off.
HINT:
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.
(b) Connect the GTS to the DLC3. *1
(c) Turn the ignition switch to ON (READY). *2
(d) Read the Data List. *3
Powertrain > Hybrid Control > Data List
|
Tester Display |
|---|
|
Hybrid/EV Battery SOC |
|
Hybrid/EV Battery Current |
(e) If the value of "Hybrid/EV Battery SOC" is less than 55%, move the shift lever to D and charge the HV battery by depressing the accelerator pedal and brake pedal simultaneously until the value reaches 55% or more. *4
(f) Move the shift lever to P. *5
(g) Set the air conditioning to MAX COOL and turn the headlights on. *6
(h) Confirm that "Hybrid/EV Battery Current" is more than 3 A. *7
(i) With the engine stopped and the conditions of steps *5, *6 and *7 satisfied, leave the vehicle for 15 seconds. *8
(j) Enter the following menus: Powertrain / Hybrid Control, Motor Generator / Trouble codes. *9
(k) Check for DTCs. *10
Powertrain > Hybrid Control > Trouble Codes
Powertrain > Motor Generator > Trouble Codes
Powertrain > HV Battery > Trouble Codes
NOTICE:
If the low HV battery information comes on, move the shift lever to P and start the engine to charge the HV battery. After the engine stops, perform steps *1 through *10 again.
|
Result |
Proceed to |
|---|---|
|
No DTCs are output, or DTCs except the following are output. |
A |
|
P0E311C or P0CA300 are output. |
B |
|
P0B231C or P1C8349 are output. |
C |
|
P300000 is output. |
D |
(l) Turn the ignition switch off.
| B |
|
| C |
|
| D |
|
LEAVE VEHICLE WITH SHIFT LEVER IN P, AND CHARGE HV BATTERY BY IDLING UNTIL IDLING STOPS (PERFORM STEPS *1 THROUGH *10) |
|
|
3. |
CHECK DTC OUTPUT (ROAD TEST) |
(a) Turn the ignition switch to ON (READY). *11
(b) Perform a road test that repeats full acceleration to 60 km/h (37 mph) and then braking to a complete stop three times. *12
CAUTION:
Perform this road test only in an appropriate safe location, in accordance with all local laws.
HINT:
This road test is performed to drive the car under high load and cause a change in the HV battery voltage.
(c) Connect the GTS to the DLC3. *13
(d) Enter the following menus: Powertrain / Hybrid Control, Motor Generator / Trouble Codes. *14
(e) Check for DTCs. *15
Powertrain > Hybrid Control > Trouble Codes
Powertrain > Motor Generator > Trouble Codes
Powertrain > HV Battery > Trouble Codes
|
Result |
Proceed to |
|---|---|
|
No DTCs are output, or DTCs except the following are output. |
A |
|
P0E311C or P0CA300 are output. |
B |
|
P0B231C or P1C8349 are output. |
C |
|
P300000 is output. |
D |
(f) Turn the ignition switch off.
| B |
|
| C |
|
| D |
|
LEAVE VEHICLE WITH SHIFT LEVER IN P, AND CHARGE HV BATTERY BY IDLING UNTIL IDLING STOPS (PERFORM STEPS *11 THROUGH *15) |
|
|
4. |
READ VALUE USING GTS (DATA LIST) |
(a) Apply the parking brake and secure the wheels using chocks.
NOTICE:
Perform this test with the AUTO function (shift-linked function) of the electric parking brake system off.
HINT:
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.
(b) Turn the ignition switch to ON (READY).
(c) Read the Data List.
Powertrain > Hybrid Control > Data List
|
Tester Display |
|---|
|
VL-Voltage before Boosting |
|
VH-Voltage after Boosting |
|
Hybrid/EV Battery SOC |
|
Hybrid/EV Battery Voltage |
(d) If the value of "Hybrid/EV Battery SOC" is less than 55%, move the shift lever to D and charge the HV battery by depressing the accelerator pedal and brake pedal simultaneously until the value reaches 55% or more.
(e) Release the accelerator pedal, move the shift lever to P and wait for the engine to stop. Read the Data List when the engine stops.
HINT:
If the engine starts, wait until it stops before continuing.
|
Result |
Proceed to |
|---|---|
|
Both of the following are not satisfied. |
A |
|
Both of the following are satisfied: |
B |
|
Both of the following are satisfied:
|
C |
(f) Turn the ignition switch off.
| B |
|
| C |
|
|
|
5. |
CHECK FREEZE FRAME DATA (VL-VOLTAGE BEFORE BOOSTING, HYBRID/EV BATTERY VOLTAGE) |
(a) Read the Freeze Frame Data of DTC P1C2D62.
Powertrain > Hybrid Control > DTC(P1C2D62) > Freeze Frame Data
|
Tester Display |
|---|
|
VL-Voltage before Boosting |
|
Hybrid/EV Battery Voltage |
|
Result |
Proceed to |
|---|---|
|
Both of the following are satisfied or both of the following are not satisfied. |
A |
|
"VL-Voltage before Boosting" is less than 151 V or more than 234 V. |
B |
|
"Hybrid/EV Battery Voltage" is less than 151 V or more than 234 V. |
C |
(b) Turn the ignition switch off.
| B |
|
| C |
|
|
|
6. |
READ VALUE USING GTS (DATA LIST) |
(a) Apply the parking brake and secure the wheels using chocks.
NOTICE:
Perform this test with the AUTO function (shift-linked function) of the electric parking brake system off.
HINT:
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.
(b) Turn the ignition switch to ON (READY).
(c) Read the Data List.
Powertrain > HV Battery > Data List
|
Tester Display |
|---|
|
Hybrid/EV Battery SOC |
|
Hybrid/EV Battery Voltage |
|
Hybrid/EV Battery Cell 1 Voltage |
|
Hybrid/EV Battery Cell 2 Voltage |
|
Hybrid/EV Battery Cell 3 Voltage |
|
Hybrid/EV Battery Cell 4 Voltage |
|
Hybrid/EV Battery Cell 5 Voltage |
|
Hybrid/EV Battery Cell 6 Voltage |
|
Hybrid/EV Battery Cell 7 Voltage |
|
Hybrid/EV Battery Cell 8 Voltage |
|
Hybrid/EV Battery Cell 9 Voltage |
|
Hybrid/EV Battery Cell 10 Voltage |
|
Hybrid/EV Battery Cell 11 Voltage |
|
Hybrid/EV Battery Cell 12 Voltage |
|
Hybrid/EV Battery Cell 13 Voltage |
|
Hybrid/EV Battery Cell 14 Voltage |
|
Hybrid/EV Battery Cell 15 Voltage |
|
Hybrid/EV Battery Cell 16 Voltage |
|
Hybrid/EV Battery Cell 17 Voltage |
|
Hybrid/EV Battery Cell 18 Voltage |
|
Hybrid/EV Battery Cell 19 Voltage |
|
Hybrid/EV Battery Cell 20 Voltage |
|
Hybrid/EV Battery Cell 21 Voltage |
|
Hybrid/EV Battery Cell 22 Voltage |
|
Hybrid/EV Battery Cell 23 Voltage |
|
Hybrid/EV Battery Cell 24 Voltage |
|
Hybrid/EV Battery Cell 25 Voltage |
|
Hybrid/EV Battery Cell 26 Voltage |
|
Hybrid/EV Battery Cell 27 Voltage |
|
Hybrid/EV Battery Cell 28 Voltage |
|
Hybrid/EV Battery Cell 29 Voltage |
|
Hybrid/EV Battery Cell 30 Voltage |
|
Hybrid/EV Battery Cell 31 Voltage |
|
Hybrid/EV Battery Cell 32 Voltage |
|
Hybrid/EV Battery Cell 33 Voltage |
|
Hybrid/EV Battery Cell 34 Voltage |
|
Hybrid/EV Battery Cell 35 Voltage |
|
Hybrid/EV Battery Cell 36 Voltage |
|
Hybrid/EV Battery Cell 37 Voltage |
|
Hybrid/EV Battery Cell 38 Voltage |
|
Hybrid/EV Battery Cell 39 Voltage |
|
Hybrid/EV Battery Cell 40 Voltage |
|
Hybrid/EV Battery Cell 41 Voltage |
|
Hybrid/EV Battery Cell 42 Voltage |
|
Hybrid/EV Battery Cell 43 Voltage |
|
Hybrid/EV Battery Cell 44 Voltage |
|
Hybrid/EV Battery Cell 45 Voltage |
|
Hybrid/EV Battery Cell 46 Voltage |
|
Hybrid/EV Battery Cell 47 Voltage |
|
Hybrid/EV Battery Cell 48 Voltage |
|
Hybrid/EV Battery Cell 49 Voltage |
|
Hybrid/EV Battery Cell 50 Voltage |
|
Hybrid/EV Battery Cell 51 Voltage |
|
Hybrid/EV Battery Cell 52 Voltage |
|
Hybrid/EV Battery Cell 53 Voltage |
|
Hybrid/EV Battery Cell 54 Voltage |
|
Hybrid/EV Battery Cell 55 Voltage |
|
Hybrid/EV Battery Cell 56 Voltage |
(d) If the value of "Hybrid/EV Battery SOC" is less than 55%, move the shift lever to D and charge the HV battery by depressing the accelerator pedal and brake pedal simultaneously until the value reaches 55% or more.
(e) Release the accelerator pedal, move the shift lever to P and wait for the engine to stop. Read the Data List when the engine stops.
HINT:
If the engine starts, wait until it stops before continuing.
|
Result |
Proceed to |
|---|---|
|
Both of the following are satisfied:
|
A |
|
The preceding condition is not satisfied. |
B |
(f) Turn the ignition switch off.
| A |
|
| B |
|
|
|