Toyota Corolla Cross: 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 malfunction
• Communication (wire harness) malfunction

• HV battery malfunction

DESCRIPTION

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

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

TYPICAL ENABLING CONDITIONS

TYPICAL MALFUNCTION THRESHOLDS

COMPONENT OPERATING RANGE

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.

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• When clearing the permanent DTCs, refer to the "CLEAR PERMANENT DTC" procedure.

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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.)

PROCEDURE

(a) Check for DTCs.

(b) Turn the ignition switch off.

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REPLACE BATTERY ECU ASSEMBLY

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