Toyota Corolla Cross Owners & Service Manuals

Toyota Corolla Cross: Hybrid/EV Battery Stack 2 Cell Circuit Voltage Above Threshold (P1A6017,P31AA17)

Toyota Corolla Cross (2022-2024) Service Manual / Engine & Hybrid System / Hybrid / Battery Control / Hybrid Battery System / Hybrid/EV Battery Stack 2 Cell Circuit Voltage Above Threshold (P1A6017,P31AA17)

DESCRIPTION

The HV battery is composed of 60 cells (3.7 V each) in series. The battery ECU assembly monitors the voltage of each HV battery cell to detect malfunctions of the HV battery.

DTC No.

Detection Item

DTC Detection Condition

Trouble Area

MIL

Warning Indicate

Note

P1A6017

Hybrid/EV Battery Stack 2 Cell Circuit Voltage Above Threshold

The voltage of any cell of the No. 2 HV supply stack sub-assembly has exceeded the threshold.

(1 trip detection logic)
  • HV battery
  • Hybrid vehicle control ECU

Comes on

Master Warning:

Comes on

SAE Code: P1A60

P31AA17

Hybrid/EV Battery Stack 1 Cell Circuit Voltage Above Threshold

The voltage of any cell of the No. 1 HV supply stack sub-assembly has exceeded the threshold.

(1 trip detection logic)
  • HV battery
  • Hybrid vehicle control ECU

Comes on

Master Warning:

Comes on

SAE Code: P31AA

MONITOR DESCRIPTION

If the battery ECU assembly detects that the voltage of a HV battery cell is excessively high, the battery ECU assembly will illuminate the MIL and store a DTC.

MONITOR STRATEGY

Related DTCs

P1A60 (INF P1A6017), P31AA (INF P31AA17): Cell voltage high

Required sensors/components

Battery ECU assembly

Frequency of operation

Continuous

Duration

TMC's intellectual property

MIL operation

immediately

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

Battery ECU assembly

DTC P1A60 (INF P1A6017) is not detected

DTC P31AA (INF P31AA17) 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. Drive the vehicle on urban roads for approximately 10 minutes.[*1]

    HINT:

    [*1]: Normal judgment procedure.

    The normal judgment procedure is used to complete DTC judgment and also used when clearing permanent DTCs.

  7. Enter the following menus: Powertrain / HV Battery / Utility / All Readiness.
  8. 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

CAUTION:

Refer to the precautions before inspecting high voltage circuit.

Click here

NOTICE:

  • After the ignition switch is turned off, there may be a waiting time before disconnecting the negative (-) auxiliary battery terminal.

    Click here

  • When disconnecting and reconnecting the auxiliary battery

    HINT:

    When disconnecting and reconnecting the auxiliary battery, there is an automatic learning function that completes learning when the respective system is used.

    Click here

PROCEDURE

1.

CHECK DTC OUTPUT (HV BATTERY)

(a) Check for DTCs.

Powertrain > HV Battery > Trouble Codes

Result

Proceed to

"P0C3000 or P31B300" is not output.

A

"P0C3000 or P31B300" is also output.

B

(b) Turn the ignition switch off.

A

REPLACE HV BATTERY

B

2.

REPLACE HV BATTERY

Click here

NEXT

REPLACE HYBRID VEHICLE CONTROL ECU

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