HYBRID CONTROL SYSTEM, Diagnostic DTC:P0AA749

DTC Code DTC Name
P0AA749 Hybrid/EV Battery Voltage Isolation Sensor Circuit Internal Electronic Failure

DESCRIPTION

The hybrid vehicle control ECU monitors the insulation monitoring circuit located in the battery voltage sensor and detects malfunctions.

DTC No. Detection Item DTC Detection Condition Trouble Area MIL Warning Indicate
P0AA749 Hybrid/EV Battery Voltage Isolation Sensor Circuit Internal Electronic Failure

Malfunction in the insulation monitoring circuit in the battery voltage sensor

(1 trip detection logic)

 Battery voltage sensor Does not come on

Master Warning Light:

Comes on
Related Data List
DTC No. Data List
P0AA749 Short Wave Highest Value Level

CONFIRMATION DRIVING PATTERN

Tech Tips

After repairs have been completed, clear the DTCs and then check that the vehicle has returned to normal by performing the following All Readiness check procedure.

Click here


  1. Connect the GTS to the DLC3.

  2. Turn the power switch on (IG) and turn the GTS 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 GTS on.

  6. With power switch on (IG) and wait for 70 seconds or more.

  7. Enter the following menus: Powertrain / Hybrid Control / Utility / All Readiness.

  8. Check the DTC judgment result.

    Tech Tips


    • 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 driving pattern again.

PROCEDURE


  1. CLEAR DTC

    Result
    Proceed to
    NEXT

    1. Connect the GTS to the DLC3.

    2. Turn the power switch on (IG).

    3. Enter the following menus: Powertrain / Hybrid Control / Trouble Codes.

    4. Clear the DTCs and freeze frame data.


      Powertrain > Hybrid Control > Clear DTCs

    5. Turn the power switch off.

      Result
      Proceed to
      NEXT

    NEXT

  2. SIMULATION TEST


    1. Connect the GTS to the DLC3.

    2. Turn the power switch on (IG) and wait for 70 seconds or more.

      Note

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

    3. Enter the following menus: Powertrain / Hybrid Control / Trouble Codes.

    4. Check if DTCs are output.


      Powertrain > Hybrid Control > Trouble Codes
      Result
      Proceed to
      P0AA749 is not output.
      P0AA749 is output.

    P0AA749 is output.

    REPLACE BATTERY VOLTAGE SENSOR Click here

    P0AA749 is not output.

  3. SIMULATION TEST

    Note

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


    1. With the vehicle and engine stopped, turn the power switch on (READY) with park (P) selected 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. Enter the following menus: Powertrain / Hybrid Control / Trouble Codes.

    6. Check if DTCs are output.


      Powertrain > Hybrid Control > Trouble Codes
      Result
      Proceed to
      P0AA649 is not output.
      P0AA649 is output.

    P0AA649 is not output.

    REPLACE BATTERY VOLTAGE SENSOR Click here

    P0AA649 is output.

    GO TO DTC CHART (P0AA649) Click here