HYBRID CONTROL SYSTEM, Diagnostic DTC:P0A0F-238

DTC Code DTC Name
P0A0F-238 Engine Failed to Start

DESCRIPTION

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

DTC No. INF Code DTC Detection Condition Trouble Area
P0A0F 238

The engine does not start even though it is being cranked (transaxle input circuit malfunction (engine system))

(1 trip detection logic)

  • Hybrid vehicle transaxle assembly

  • Transmission input damper assembly

  • Power management control ECU

  • Engine
Related Data List
DTC No. Data List
P0A0F-238

  • Vehicle Spd

  • Engine Revolution

  • Generator(MG1) Torq

  • Generator(MG1) Rev

  • Motor(MG2) Revolution
A01I29JE01

INSPECTION PROCEDURE

Tech Tips


  • A seized engine, mechanical malfunction of the hybrid vehicle transaxle can be suspected.

  • If this DTC is output, the engine or gears in the transaxle may have seized or foreign matter have been caught in either of them. Therefore, check the engine oil, ATF and coolant levels.

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


    1. While driving the vehicle at a speed of 20 km/h (12 mph) or more in EV mode, depress the accelerator pedal to start the engine, and drive the vehicle for 3 seconds or more.*1


      • *1: When the HV system is normal, the engine starts when the accelerator pedal is depressed halfway or more. If the HV system is malfunctioning, the engine may not start. Even in this case, drive the vehicle at a speed of 20 km/h (12 mph) or more in EV mode for 3 seconds or more.

PROCEDURE


  1. CHECK DTC OUTPUT (HYBRID CONTROL)


    1. Connect the Techstream 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
      Only DTC P0A0F-238 is output or any DTCs other than P0A1D (Hybrid Powertrain Control Module) are also output. A
      P0A1D (Hybrid Powertrain Control Module) is output. B

    5. Turn the power switch off.


    B

    GO TO DTC CHART (HYBRID CONTROL SYSTEM) Click here

    A

  2. CHECK CRANKSHAFT PULLEY REVOLUTION (P POSITION)


    1. Check that the shift lever is in 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.

    4. Lower the vehicle.


    NG

    CHECK CRANKSHAFT PULLEY REVOLUTION (N POSITION) Click here

    OK

  3. CLEAR DTC


    1. Connect the Techstream 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 Techstream to the DLC3.

    2. Turn the power switch on (READY).

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

    4. Read the Data List.

    5. A01I35QE03

      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


      • If the engine does not race and DTC P3147-239 (Transmission system) is output or generator (MG1) operates but the engine does not crank, replace the hybrid vehicle transaxle assembly.

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

        Data List ENGINE REV Generator (MG1) REV
        Reference Value Approximately 1000 rpm Approximately 3600 rpm
        Approximately 1500 rpm Approximately 5400 rpm
        Approximately 2500 rpm Approximately 9000 rpm
      Result
      Result Proceed to
      OK A
      NG (When Not Using the Engine Support Bridge) B
      NG (When Using the Engine Support Bridge) C

    6. Turn the power switch off.


    B

    REPLACE HYBRID VEHICLE TRANSAXLE ASSEMBLY (When Not Using the Engine Support Bridge) Click here

    C

    REPLACE HYBRID VEHICLE TRANSAXLE ASSEMBLY (When Using the Engine Support Bridge) Click here

    A

  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).
      Result
      Result Proceed to
      OK A
      NG (When Not Using the Engine Support Bridge) B
      NG (When Using the Engine Support Bridge) C

    3. Turn the power switch off.


    B

    REPLACE HYBRID VEHICLE TRANSAXLE ASSEMBLY (When Not Using the Engine Support Bridge) Click here

    C

    REPLACE HYBRID VEHICLE TRANSAXLE ASSEMBLY (When Using the Engine Support Bridge) Click here

    A

  6. INSPECT ENGINE SPEED


    1. Connect the Techstream to the DLC3.

    2. Turn the power switch on (READY).

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

    4. Read the Data List.

    5. Move the shift lever to D.

    6. 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.

      Tech Tips

      If the engine races or DTC P3147-241 (Transmission system) is output, replace the transmission input damper assembly.

    7. Turn the power switch off.


    NG

    REPLACE TRANSMISSION INPUT DAMPER ASSEMBLY Click here

    OK

    REPLACE POWER MANAGEMENT CONTROL ECU Click here

  7. CHECK CRANKSHAFT PULLEY REVOLUTION (N POSITION)


    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.
      Result
      Result Proceed to
      OK (When Not Using the Engine Support Bridge) A
      OK (When Using the Engine Support Bridge) B
      NG C

    4. Lower the vehicle.


    B

    REPLACE HYBRID VEHICLE TRANSAXLE ASSEMBLY (When Using the Engine Support Bridge) Click here

    C

    REPAIR OR REPLACE ENGINE

    A

    REPLACE HYBRID VEHICLE TRANSAXLE ASSEMBLY (When Not Using the Engine Support Bridge) Click here