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Home >> Toyota >> 2021 >> Highlander LE, 4WD >> Repair and Diagnosis >> External Pages >> Different variant/trim >> Section 108 (Hybrid Control System (2WD) - Diagnostic Codes (3 Of 7)) >> HYBRID CONTROL SYSTEM (for 2WD) >> DTC P0AA7-49: Hybrid/EV Battery Voltage Isolation Sensor Circuit Internal Electronic Failure [12/2019 - 11/2023] >> Procedure

DTC P0AA7-49: Hybrid/EV Battery Voltage Isolation Sensor Circuit Internal Electronic Failure [12/2019 - 11/2023]: Procedure

WARNING: This page is about a different variant/trim than selected.
  1. CLEAR DTC 

    Refer to PROCEDURE - Step 3

    Result

    Proceed to
    NEXT

    Result: 

    NEXT 

    See step  2

  2. SIMULATION TEST 
    1. Turn the ignition switch to ON and wait for 70 seconds or more.
      NOTE:

      Do not turn the ignition switch off until step 3 is complete.

    2. Check if DTCs are output.

      Powertrain > Hybrid Control > Trouble Codes 

      Result

      Result Proceed to
      P0AA7-49 is not output. A
      P0AA7-49 is output. B

    Result: 

    B 

    REPLACE BATTERY VOLTAGE SENSOR. Refer to  REMOVAL [12/2019 - 10/2022]  , or refer to  REMOVAL [10/2022 - 11/2023] 

    Result: 

    A 

    See step  3

  3. SIMULATION TEST 
    NOTE:

    Do not turn the ignition switch off while performing this inspection.

    1. With the vehicle and engine stopped, turn the ignition switch to ON (READY) with shift lever in P and wait for 70 seconds or more. (If the engine starts, wait until the engine stops.)
    2. While depressing the brake pedal without depressing the accelerator pedal, move the shift lever to D and wait for 1 minute. (Step A)
    3. Drive the vehicle 0.5 m (1.6 ft.) forward and perform step A.
    4. Drive the vehicle another 0.5 m (1.6 ft.) forward and perform step A. Repeat this procedure 5 times (minimum total driving distance: 2 m (6.6 ft.)).
    5. Check if DTCs are output.

      Powertrain > Hybrid Control > Trouble Codes 

      Result

      Result Proceed to
      P0AA6-49 is not output. A
      P0AA6-49 is output. B
    6. Turn the ignition switch off.

    Result: 

    A 

    REPLACE BATTERY VOLTAGE SENSOR. Refer to  REMOVAL [12/2019 - 10/2022]  , or refer to  REMOVAL [10/2022 - 11/2023] 

    Result: 

    B 

    GO TO DTC CHART (P0AA6-49). Refer to  DTC P0AA6-49: Hybrid/EV Battery Voltage System Isolation Internal Electronic Failure; DTC P1C7C-49: Hybrid/EV Battery Voltage System Isolation (A/C Area) Internal Electronic Failure; DTC P1C7D-49: Hybrid/EV Battery Voltage System Isolation (Hybrid/EV Battery Area) Internal Electronic Failure; DTC P1C7E-49: Hybrid/EV Battery Voltage System Isolation (Transaxle Area) Internal Electronic Failure; DTC P1C7F-49: Hybrid/EV Battery Voltage System Isolation (Direct Current Area) Internal Electronic Failure [12/2019 - 11/2023]  

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