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 voltage sensor

(1 trip detection logic)

 Battery smart unit
Related Data List
DTC No. Data List
P0AA7-727 Short Wave Highest Val

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 ignition switch to ON (IG) and wait for 70 seconds or more.

PROCEDURE


  1. CLEAR DTC


    NEXT

  2. SIMULATION TEST


    1. Connect the GTS to the DLC3.

    2. Turn the ignition switch to ON (IG) and wait for 1 minute or more.

      Note

      Do not turn the ignition 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

    A

  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 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 50 cm (1.6 ft.) forward and perform step A.

    4. Drive the vehicle another 50 cm (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

    B

    GO TO DTC CHART (P0AA6)