Lexus ES manuals

Lexus ES: Flying Capacitor/Internal Control Module Hybrid/EV Battery Monitor Voltage Out of Range (P1AFD1C)

Lexus ES (XZ10) Service Manual / Engine & Hybrid System / Hybrid / Battery Control / Hybrid Battery System (for Lithium-ion Battery) / Flying Capacitor/Internal Control Module Hybrid/EV Battery Monitor Voltage Out of Range (P1AFD1C)

DESCRIPTION

The battery ECU assembly monitors the HV battery voltage. If the battery ECU assembly detects a malfunction of its internal voltage detection circuits, it will store this DTC.

HINT:

If this DTC is output, it will be necessary to replace the battery ECU assembly.

DTC No.

Detection Item

DTC Detection Condition

Trouble Area

MIL

Warning Indicate

P1AFD1C

Flying Capacitor/Internal Control Module Hybrid/EV Battery Monitor Voltage Out of Range

Both of the following conditions are met:

The battery ECU assembly detects a malfunction of its internal voltage detection circuits.

The difference between the total voltage of all battery cells and the stack voltage is large.

(1 trip detection logic)

Battery ECU assembly

Comes on

Master Warning Light:

Comes on
Related Data List

DTC No.

Data List

P1AFD1C
  • Hybrid/EV Battery Cell 1 to 70 Voltage
  • Hybrid/EV Battery Voltage

MONITOR DESCRIPTION

If the battery ECU assembly detects a malfunction in its internal voltage detection circuits, it will illuminate the MIL and store a DTC.

MONITOR STRATEGY

Related DTCs

P1AFD (INF P1AFD1C): Battery Voltage Sensor Circuit Range/Performance

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 P1AFD (INF P1AFD1C) 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. With power switch on (IG) and wait for 10 seconds or more.[*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.

PROCEDURE

1.

REPLACE BATTERY ECU ASSEMBLY

Click here

NEXT

END

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