HYBRID CONTROL SYSTEM, Diagnostic DTC:P0AA7-727

DTC Code DTC Name
P0AA7-727 Hybrid Battery Voltage Isolation Sensor Circuit

DESCRIPTION

The hybrid vehicle control ECU monitors the insulation monitoring circuit located in the battery smart unit and detects a malfunction.

DTC No. INF Code DTC Detection Condition Trouble Area
P0AA7 727 Malfunction in the insulation monitoring circuit in the battery smart unit Battery smart unit

CAUTION / NOTICE / HINT

Tech Tips

After the repair, clear the DTCs and perform the following procedure to check that DTCs are not output.


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

PROCEDURE


  1. CLEAR DTC


    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. Read and record the DTCs and freeze frame data.

    5. Clear DTCs and freeze frame data.

    6. Turn the power switch off.


    NEXT

  2. SIMULATION TEST


    1. Connect the GTS to the DLC3.

    2. Turn the power switch on (IG) and wait for 1 minute or more.

      Tech Tips

      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.

      Result
      Result Proceed to
      P0AA7-727 is not output. A
      P0AA7-727 is output. B

    B

    REPLACE BATTERY SMART UNIT Click here

    A

  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 1 second 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.

      Result
      Result Proceed to
      P0AA6 is not output. A
      P0AA6 is output. B

    A

    REPLACE BATTERY SMART UNIT Click here

    B

    GO TO DTC CHART (P0AA6)