Toyota Corolla Cross Owners & Service Manuals

Toyota Corolla Cross: Hybrid/EV Battery "A" Voltage Sensor Voltage Out of Range (P0B231C)

Toyota Corolla Cross (2022-2024) Service Manual / Engine & Hybrid System / Hybrid / Battery Control / Hybrid Control System / Hybrid/EV Battery "A" Voltage Sensor Voltage Out of Range (P0B231C)

DTC SUMMARY

MALFUNCTION DESCRIPTION

The hybrid vehicle control ECU detects a VB sensor malfunction.

The cause of this malfunction may be one of the following:

Battery ECU assembly VB sensor internal circuit malfunction
  • Battery ECU assembly malfunction
  • Communication (wire harness) malfunction
High voltage system malfunction
  • HV battery malfunction

DESCRIPTION

The battery ECU assembly sends HV battery voltage information to the hybrid vehicle control ECU via serial communication.

DTC No.

Detection Item

DTC Detection Condition

Trouble Area

MIL

Warning Indicate

Note

P0B231C

Hybrid/EV Battery "A" Voltage Sensor Voltage Out of Range

Battery ECU assembly malfunction:

When not boosting, difference between "Hybrid/EV Battery Voltage" and "VL-Voltage before Boosting" is large and difference between "Hybrid/EV Battery Voltage" and "VH-Voltage after Boosting" is large.

(1 trip detection logic)

Battery ECU assembly

Comes on

Master Warning:

Comes on

SAE Code:

P0B23

MONITOR DESCRIPTION

The hybrid vehicle control ECU calculates the differences between the received HV battery voltage, boost converter voltage, and inverter voltage. If the differences exceed prescribed values, the hybrid vehicle control ECU determines that there is a malfunction in the battery ECU assembly circuit. If the hybrid vehicle control ECU detects this malfunction, it will illuminate the MIL and store a DTC.

MONITOR STRATEGY

Related DTCs

P0B23 (INF P0B231C): Hybrid/EV Battery "A" Voltage

Required sensors/components

Battery ECU assembly

Frequency of operation

-

Duration

-

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 P0B23 (INF P0B231C) 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

  1. Connect the GTS to the DLC3.
  2. Turn the ignition switch to ON and turn the GTS on.
  3. Clear the DTCs (even if no DTCs are stored, perform the clear DTC procedure).
  4. Turn the ignition switch off and wait for 2 minutes or more.
  5. Turn the ignition switch to ON and turn the GTS on.
  6. Turn the ignition switch to ON (READY). [*1]
  7. 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]
  8. Move the shift lever to P, check that the engine is stopped and move the shift lever to N. [*3]
  9. Set the A/C for maximum cooling. [*4]
  10. Leave the vehicle for a few minutes. [*5]

    HINT:

    • After the repair if "VL-Voltage before Boosting" and the "Hybrid/EV Battery Voltage" are approximately the same when the ignition switch is turned to ON (READY) with shift lever in P and the accelerator pedal not depressed, 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.

  11. Enter the following menus: Powertrain / Hybrid Control / Utility / All Readiness.
  12. 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

NOTICE:

Performing the check procedures for a long time with shift lever in N may cause DTC P300000 to be set.

HINT:

  • If the battery ECU assembly has been replaced, it is necessary to confirm the voltage of each battery block. With ignition switch ON (READY), shift lever in P, the engine stopped and the HV battery voltage at 208 V or more, check the value of Data List items "Hybrid/EV Battery Voltage", "VL-Voltage before Boosting" and "VH-Voltage after Boosting". When the system is normal, the values of "Hybrid/EV Battery Voltage", "VL-Voltage before Boosting", and "VH-Voltage after Boosting" should be almost equal. If the difference between each value is more than the voltages specified below, the system is malfunctioning.

    Inspection Voltage

    Maximum Voltage Difference

    Difference between "Hybrid/EV Battery Voltage" and "VL-Voltage before Boosting"

    39 V

    Difference between "Hybrid/EV Battery Voltage" and "VH-Voltage after Boosting"

    60 V

    Difference between "VL-Voltage before Boosting" and "VH-Voltage after Boosting"

    76 V

HINT:

  • P0B231C may be output as a result of the malfunction indicated by the DTCs in table below.
    1. The chart above is listed in inspection order of priority.
    2. 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

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

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

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

P0D2D16

Drive Motor "A" Inverter Voltage Sensor (VH) Circuit Voltage Below Threshold

P0D2D17

Drive Motor "A" Inverter Voltage Sensor (VH) Circuit Voltage Above Threshold

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.

CHECK DTC OUTPUT (HYBRID CONTROL, MOTOR GENERATOR, HV BATTERY)

(a) Check for DTCs.

Powertrain > Hybrid Control > Trouble Codes Powertrain > Motor Generator > Trouble Codes Powertrain > HV Battery > Trouble Codes

Result

Proceed to

P0B231C only is output, or DTCs except the ones in the table below are also output.

NEXT

(b) Turn the ignition switch off.

NEXT

REPLACE BATTERY ECU ASSEMBLY

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