HYBRID / BATTERY CONTROL: HYBRID CONTROL SYSTEM (for NICKEL METAL HYDRIDE BATTERY): P1CBE1E,...,P1CC61E; Hybrid/EV Battery Block 1 Voltage Difference Out of Range; 2020 - 2022 MY Corolla Corolla HV [01/2019

HINT:

These DTCs can be stored after clearing DTCs and driving the vehicle for approximately 10 minutes.
These DTCs are stored when a malfunction is detected in the HV battery or a battery voltage sensor. However, depending on the driving conditions, the malfunction may not be reproduced if the condition of the HV battery changes.
1. When the HV battery is malfunctioning:
  - - Voltage of 1 or more of the battery blocks has dropped.
  - - Voltage of all battery blocks is output randomly with no certain pattern.
2. When the battery voltage sensor is malfunctioning:
  - - While current is flowing to or from the HV battery, the voltage of a specific HV battery block will fluctuates.
In order to ensure HV battery performance, appropriate cooling performance must be maintained. Perform the following items as necessary. If cooling performance has decreased and "Maintenance Required for Traction Battery Cooling Parts See Owner's Manual" is displayed on the multi-information display, make sure to perform the following items:
- Make sure the air intake port is not blocked.
- Make sure there are no gaps between the connecting parts of the ducts.
- Clean the No. 1 HV battery intake filter.
  - Clear the DTCs to reset the learning values even if no DTCs are stored.

Related Data List

HINT:

*1: Under normal conditions, the values of Hybrid/EV Battery Block 1, 2, 8 and 9 Voltage will be approximately 16 V and Hybrid/EV Battery Block 3, 4, 5, 6 and 7 Voltage will be approximately 32 V.
If there is a short or open in a battery block voltage detection line, the value of Hybrid/EV Battery Block Voltage for the corresponding battery block will be lower than 8 V.
The Data List items Internal Resistance 1 to 9 indicate internal resistance correction values used by the hybrid vehicle control ECU to detect malfunctions of the HV battery.

MONITOR DESCRIPTION

If there is an abnormal internal resistance or voltage in the battery blocks, the battery voltage sensor determines that a malfunction has occurred. When the malfunction detection condition is satisfied, the hybrid vehicle control ECU will illuminate the MIL and store a DTC.

MONITOR STRATEGY

TYPICAL ENABLING CONDITIONS

TYPICAL MALFUNCTION THRESHOLDS

COMPONENT OPERATING RANGE

CONFIRMATION DRIVING PATTERN

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 (IG) and turn the Techstream on.
Drive the vehicle on urban roads for approximately 10 minutes.[*1]
HINT:
- This DTC may not be stored if the vehicle is stopped or being driven at a constant speed.
- [*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.
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 the normal judgment procedure again.

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.

*a	Without waiting for 10 minutes

Click here

HINT:

Waiting for at least 10 minutes is required to discharge the high-voltage capacitor inside the inverter with converter assembly.

Make sure to insulate the high-voltage connectors and terminals of the HV battery with insulating tape after removing it.
If the HV battery stored without insulating the connectors and terminals, electric shock or fire may result.

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.

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.

PROCEDURE

Powertrain > Hybrid Control > Trouble Codes

(e) Using the Techstream, make a note of the freeze frame data item "Hybrid/EV Battery Block (3 to 7) Voltage".

(f) Compare the freeze frame data item "Hybrid/EV Battery Block (3 to 7) Voltage" values with those shown in the following combination tables.

*1: If the hybrid battery terminal block has been replaced, use the total distance driven since it was replaced.

Powertrain > Hybrid Control > Trouble Codes

(e) Using the Techstream, make a note of the freeze frame data item "Hybrid/EV Battery Block 1, 2, 8 and 9 Voltage".

(f) Compare the freeze frame data item "Hybrid/EV Battery Block 1, 2, 8 and 9 Voltage" values with those shown in the following combination tables.

Table 1

Table 2

If an internal malfunction occurs in the battery voltage sensor, this symptom (difference in voltage of 1.2 V or more for certain pairs of blocks as shown in the illustration) will occur.

(f) Enter the following menus: Powertrain / Hybrid Control / Data List / Hybrid/EV Battery Block 1 to 3 Voltage, Hybrid/EV Battery Block 7 to 9 Voltage.

Select "Hybrid/EV Battery Block 1 to 3 Voltage" and "Hybrid/EV Battery Block 7 to 9 Voltage" only. (Do not select any other Data List items.)

Powertrain > Hybrid Control > Data List

(h) Move the shift lever to D and depress both the accelerator pedal and brake pedal at the same time.

(i) Check the voltage of each "Hybrid/EV Battery Block Voltage" of "Hybrid/EV Battery Block 1 to 3 Voltage" and "Hybrid/EV Battery Block 7 to 9 Voltage" in the Data List with the power switch on (READY).

When comparing the voltage of a circuit C battery block with that of a circuit A battery block or circuit B battery block, use half of the displayed voltage value for the circuit C battery block.

Table 1

Table 2

Table 3

HINT:

If an internal malfunction occurs in the battery voltage sensor, the voltage of a specific hybrid battery block will fluctuate 0.2 V or more.
As changes in the voltage of hybrid battery blocks are difficult to see when the HV battery current is 0 A, read the Data List while the HV battery is being charged or discharged.
By displaying the Data List items for the corresponding circuit A battery block, circuit B battery block and circuit C battery block simultaneously, judgment can be performed more easily.
Make sure to set the graph display so that each graduation on the horizontal axis (time) indicates approximately 10 seconds.

Powertrain > Hybrid Control > Trouble Codes

*1: If the hybrid battery terminal block has been replaced, use the total distance driven since it was replaced.

DESCRIPTION

Related Data List

Data List

Vehicle Control History Data

MONITOR DESCRIPTION

MONITOR STRATEGY

TYPICAL ENABLING CONDITIONS

TYPICAL MALFUNCTION THRESHOLDS

COMPONENT OPERATING RANGE

CONFIRMATION DRIVING PATTERN

CAUTION / NOTICE / HINT

PROCEDURE

Powertrain > Hybrid Control > Trouble Codes

Powertrain > Hybrid Control > Trouble Codes

Powertrain > Hybrid Control > Trouble Codes

Table 1

Table 2

Powertrain > Hybrid Control > Data List

Table 1

Table 2

Table 3

Powertrain > Hybrid Control > Trouble Codes