Toyota Avalon (XX50) 2019-2022 Service & Repair Manual: 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 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.

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

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 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. 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.

7. Enter the following menus: Powertrain / Hybrid Control / 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.

WIRING DIAGRAM

Refer to the wiring diagram for DTC P0AFC00.

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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.

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  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.

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PROCEDURE

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OK

REPLACE BATTERY VOLTAGE SENSOR

NG

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OK

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

NG

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