HYBRID CONTROL SYSTEM, Diagnostic DTC:P0A0F-238

DTC Code DTC Name
P0A0F-238 Engine Failed to Start

DESCRIPTION

If the power management control ECU (HV CPU) detects that the engine or transmission gear has seized, the power management control ECU (HV CPU) will perform fail-safe control. Also, if a substance or object is preventing the engine or transmission internal components from rotating, the power management control ECU (HV CPU) will perform fail-safe control.

DTC No. INF Code DTC Detection Condition Trouble Area
P0A0F 238 Engine does not start even though it is being cranked (transaxle input malfunction [engine system])

  • Hybrid vehicle transaxle assembly

  • Transmission input damper assembly

  • Power management control ECU

  • Engine
A01ND41E02

INSPECTION PROCEDURE

Tech Tips

If this DTC is output, the engine or transmission gear may be seized. Be sure to check the level of the engine oil, automatic transmission fluid (ATF), and coolant before inspection.

PROCEDURE


  1. CHECK DTC OUTPUT (HV)


    1. Connect the intelligent tester to the DLC3.

    2. Turn the power switch on (IG).

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

    4. Check if DTCs are output.

      Result
      Result Proceed to
      P0A0F-238 only is output. A
      P0A1D (hybrid vehicle control ECU circuit malfunction) is output. B

    5. Turn the power switch off.


    B

    GO TO DTC CHART Click here

    A

  2. CHECK CRANKSHAFT PULLEY REVOLUTION (SHIFT LEVER IN P)


    1. Move the shift lever to P.

    2. Lift up the vehicle.

    3. Turn the crankshaft pulley using hand tools to check if the crankshaft can rotate smoothly.

      CAUTION:

      Do not turn the power switch on (READY) while performing this inspection. Be sure to turn the power switch off before performing this inspection, to prevent the engine from starting.

      Note

      Engine compression causes resistance when turning the crankshaft pulley. Check if the crankshaft rotates smoothly (or if it is locked) by manually applying sufficient torque to turn the crankshaft pulley. The torque required to turn the crankshaft pulley should be the same as for a known good vehicle of the same type.

      OK
      The crankshaft rotates smoothly.

    NG

    CHECK CRANKSHAFT PULLEY REVOLUTION (SHIFT LEVER IN N) Click here

    OK

  3. CLEAR DTC (HV)


    1. Connect the intelligent tester 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

  4. CHECK ENGINE RACING


    1. Connect the intelligent tester to the DLC3.

    2. Turn the power switch on (IG).

    3. Move the shift lever to P.

    4. Enter the following menus: Powertrain / Hybrid Control / Data List / Generator (MG1) Rev, Engine Revolution.

    5. Read the Data List.

    6. Turn the power switch on (READY).

    7. A01NDV7E01

      While the READY indicator is on, fully depress the accelerator pedal for 10 seconds.

      OK
      Generator (MG1) Rev increases to approximately 3.6 times that of Engine Revolution.

      Tech Tips

      Refer to the graph for Data List confirmation of "Generator (MG1) Rev" and " Engine Revolution".

      Data List ENGINE REV MG1 REV
      Reference Value Approximately 900 rpm Approximately 3200 rpm
      Approximately 1200 rpm Approximately 4300 rpm
      Approximately 1500 rpm Approximately 5400 rpm

    8. Turn the power switch off.


    NG

    REPLACE HYBRID VEHICLE TRANSAXLE ASSEMBLY Click here

    OK

  5. CHECK CREEP MOVEMENT


    1. Turn the power switch on (READY).

    2. Depress the brake pedal, move the shift lever to D, and release the brake pedal.

      OK
      The wheels turn (the vehicle creeps forward).

    3. Turn the power switch off.


    NG

    REPLACE HYBRID VEHICLE TRANSAXLE ASSEMBLY Click here

    OK

  6. INSPECT ENGINE SPEED


    1. Connect the intelligent tester to the DLC3.

    2. Turn the power switch on (IG).

    3. Enter the following menus: Powertrain / Hybrid Control / Data List / Motor (MG2) Revolution, Generator (MG1) Rev, Engine Revolution.

    4. Read the Data List.

    5. Fully depress the accelerator pedal to accelerate the vehicle from a stop.

      Note

      Perform this test only in an appropriate safe location, in accordance with all local laws.

      OK
      The difference between Engine Revolution and 0.28 X Generator (MG1) Rev + 0.29 X Motor (MG2) Revolution is 500 rpm or more and it is maintained for 1 second.

    6. Turn the power switch off.


    NG

    REPLACE TRANSMISSION INPUT DAMPER ASSEMBLY Click here

    OK

  7. SIMULATION TEST


    1. Perform steps 2 through 6 again.

      OK
      The problem symptom is not reproduced.
      Result
      Result Proceed to
      OK (for LHD) A
      OK (for RHD) B
      NG C

    B

    REPLACE POWER MANAGEMENT CONTROL ECU (for RHD) Click here

    C

    REPLACE HYBRID VEHICLE TRANSAXLE ASSEMBLY Click here

    A

    REPLACE POWER MANAGEMENT CONTROL ECU (for LHD) Click here

  8. CHECK CRANKSHAFT PULLEY REVOLUTION (SHIFT LEVER IN N)


    1. Lift up the vehicle.

    2. Move the shift lever to N.

    3. Turn the crankshaft pulley using hand tools to check if the crankshaft can rotate smoothly.

      CAUTION:

      Do not turn the power switch on (READY) while performing this inspection. Be sure to turn the power switch off before performing this inspection, to prevent the engine from starting.

      Note

      Engine compression causes resistance when turning the crankshaft pulley. Check if the crankshaft rotates smoothly (or if it is locked) by manually applying sufficient torque to turn the crankshaft pulley. The torque required to turn the crankshaft pulley should be the same as for a known good vehicle of the same type.

      OK
      The crankshaft rotates smoothly.

    NG

    REPAIR OR REPLACE ENGINE

    OK

    REPLACE HYBRID VEHICLE TRANSAXLE ASSEMBLY Click here