Lexus ES manuals

Lexus ES: Hybrid/EV Battery Stack 2 Cell Circuit Voltage Above Threshold (P1A6017,P31AA17)

Lexus ES (XZ10) Service Manual / Engine & Hybrid System / Hybrid / Battery Control / Hybrid Battery System (for Lithium-ion Battery) / Hybrid/EV Battery Stack 2 Cell Circuit Voltage Above Threshold (P1A6017,P31AA17)

DESCRIPTION

The HV battery is composed of 70 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

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)
  • No. 2 HV supply stack sub-assembly
  • Hybrid vehicle control ECU

Comes on

Master Warning Light:

Comes on

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)
  • No. 1 HV supply stack sub-assembly
  • Hybrid vehicle control ECU

Comes on

Master Warning Light:

Comes on
Related Data List

DTC No.

Data List

P1A6017

Hybrid/EV Battery Cell 1 to 70 Voltage

P31AA17

The following items can be helpful when performing repairs:

Data List
  • WIN Control Limit Power
  • Hybrid/EV Battery Current
  • Hybrid/EV Battery Voltage
  • Hybrid/EV Battery SOC

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 Techstream to the DLC3.
  2. Turn the power switch on (IG) and turn the Techstream on.
  3. Clear the DTCs (even if no DTCs are stored, perform the clear DTC procedure).
  4. Turn the power switch off and wait for 2 minutes or more.
  5. Turn the power switch on (IG) and turn the Techstream 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 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.
  • Before returning the HV battery, make sure to perform a recovery inspection.

    Click here

  • Before returning the HV supply stack sub-assembly, make sure to perform a recovery inspection.

    Click here

  • Make a note of the output DTCs as some of them may be necessary for recovery inspection of the HV battery and HV supply stack sub-assemblies.
  • 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.

NOTICE:

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.

Click here

PROCEDURE

1.

CHECK DTC OUTPUT (HV BATTERY)

(a) Connect the Techstream to the DLC3.

(b) Turn the power switch on (IG).

(c) Enter the following menus: Powertrain / HV Battery / Trouble Codes.

(d) 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

(e) Turn the power switch off.

B

GO TO STEP 3

A

2.

CHECK DTC

(a) Check the DTCs that were output when the vehicle was brought to the workshop.

Result

Proceed to

"P1A6017" is also output.

A

"P31AA17" is also output.

B
A

REPLACE NO. 2 HV SUPPLY STACK SUB-ASSEMBLY

B

REPLACE NO. 1 HV SUPPLY STACK SUB-ASSEMBLY

3.

CHECK DTC

(a) Check the DTCs that were output when the vehicle was brought to the workshop.

Result

Proceed to

"P1A6017" is also output.

A

"P31AA17" is also output.

B
B

GO TO STEP 5

A

4.

REPLACE NO. 2 HV SUPPLY STACK SUB-ASSEMBLY

Click here

NEXT

REPLACE HYBRID VEHICLE CONTROL ECU

5.

REPLACE NO. 1 HV SUPPLY STACK SUB-ASSEMBLY

Click here

NEXT

REPLACE HYBRID VEHICLE CONTROL ECU

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