Lexus ES: Hybrid/EV Battery Sensor Module Internal Electronic Failure (P0AFC49)

Lexus ES (XZ10) Service Manual / Engine & Hybrid System / Hybrid / Battery Control / Hybrid Control System (for Nickel Metal Hydride Battery) / Hybrid/EV Battery Sensor Module Internal Electronic Failure (P0AFC49)

DTC SUMMARY

MALFUNCTION DESCRIPTION

When the hybrid control system is activated, the hybrid vehicle control ECU checks the power supply voltage of the battery voltage sensor and detects malfunction.

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

Battery voltage sensor internal malfunction

Battery voltage sensor malfunction

Low-voltage circuit (12 V) malfunction

Battery voltage sensor malfunction
Low voltage wire harness malfunction

DESCRIPTION

When the hybrid control system is activated, the hybrid vehicle control ECU checks the power supply voltage of the battery voltage sensor.

DTC No.	Detection Item	DTC Detection Condition	Trouble Area	MIL	Warning Indicate
P0AFC49	Hybrid/EV Battery Sensor Module Internal Electronic Failure	Abnormal battery voltage sensor power source voltage: Power source voltage of the battery voltage sensor drops during precharge. (1 trip detection logic)	Battery voltage sensor Wire harness or connector	Comes on	Master Warning Light: Comes on

DTC No.

Detection Item

DTC Detection Condition

Trouble Area

MIL

Warning Indicate

P0AFC49

Hybrid/EV Battery Sensor Module Internal Electronic Failure

Abnormal battery voltage sensor power source voltage:

Power source voltage of the battery voltage sensor drops during precharge.

(1 trip detection logic)

Battery voltage sensor
Wire harness or connector

Comes on

Master Warning Light:

Comes on

Related Data List

DTC No.	Data List
P0AFC49	Hybrid Battery Sensor Module Power Supply Voltage BATT Voltage

MONITOR DESCRIPTION

When the hybrid vehicle control ECU detects a low power supply voltage for the battery voltage sensor while pre-charge is occurring, it determines that there is a malfunction in the battery voltage sensor circuit. If the hybrid vehicle control ECU detects a malfunction, it will illuminate the MIL and store a DTC.

MONITOR STRATEGY

Related DTCs	P0AFC (INF P0AFC49): Hybrid/EV battery pack sensor module
Required sensors/components	-
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 P0AFC (INF P0AFC49) 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

Connect the Techstream to the DLC3.
Turn the power switch on (IG) and turn the Techstream on.
Clear the DTCs (even if no DTCs are stored, perform the clear DTC procedure).
Turn the power switch off and wait for 2 minutes or more.
Turn the power switch on (IG) and turn the Techstream on.
Turn the power switch on (READY) and wait for 15 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.
Enter the following menus: Powertrain / Hybrid Control / Utility / All Readiness.
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.

WIRING DIAGRAM

Refer to the wiring diagram for DTC P0AFC00.

Click here

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.
Click here

HINT:

Waiting for at least 10 minutes is required to discharge the high-voltage capacitor inside the inverter with converter assembly.

*a

Without waiting for 10 minutes

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 HARNESS AND CONNECTOR (IGCT VOLTAGE)

Click here

REPLACE BATTERY VOLTAGE SENSOR

2.	CHECK HARNESS AND CONNECTOR (BATTERY VOLTAGE SENSOR - BODY GROUND)

Click here

REPAIR OR REPLACE HARNESS OR CONNECTOR (IGCT NO. 2 FUSE - BATTERY VOLTAGE SENSOR)

REPAIR OR REPLACE HARNESS OR CONNECTOR (BATTERY VOLTAGE SENSOR - BODY GROUND)

SEE MORE:

Components

COMPONENTS ILLUSTRATION *1 COWL SIDE TRIM BOARD LH *2 FRONT DOOR OPENING TRIM COVER LH *3 FRONT DOOR SCUFF PLATE LH *4 INSTRUMENT SIDE PANEL LH *5 LOWER INSTRUMENT PANEL FINISH PANEL SUB-ASSEMBLY *6 NO. 1 INSTRUMENT PANEL UNDER COVER SUB-ASSEMBLY *7 PANORAMIC VIEW

Front Sensor Communication Malfunction (C1AEC)

DESCRIPTION This DTC is stored when there is an open or short circuit in the communication line between the front sensors and the ECU, or when there is a malfunction in a front sensor. DTC No. Detection Item DTC Detection Condition Trouble Area C1AEC Front Sensor Communication Malfunc

Lexus ES: Hybrid/EV Battery Sensor Module Internal Electronic Failure (P0AFC49)

READ NEXT:

Hybrid/EV Battery Sensor Module Signal Compare Failure (P0AFC62,...,P308A13)

Hybrid/EV Battery "A" Voltage Sensor Voltage Out of Range (P0B231C)

Hybrid/EV Battery State of Charge High (P0C3000)

SEE MORE:

Components

Front Sensor Communication Malfunction (C1AEC)