HYBRID CONTROL SYSTEM, Diagnostic DTC:P0A0F-238

DTC Code DTC Name
P0A0F-238 Engine Failed to Start

DESCRIPTION

If the hybrid vehicle control ECU detects that the engine or transaxle gear has seized, the hybrid vehicle control ECU will perform fail-safe control. Also, if a substance or object is preventing the engine or transaxle internal components from rotating, the hybrid vehicle 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 while driving (engine or transmission input components malfunction)

(1 trip detection logic)

  • Hybrid vehicle transaxle assembly

  • Transmission input damper assembly

  • Hybrid vehicle control ECU

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

  • Engine Revolution

  • Generator(MG1) Torq

  • Generator(MG1) Rev

  • Vehicle Spd

  • Motor(MG2) Revolution
A004EEIE19

CAUTION / NOTICE / HINT

Tech Tips


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

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

  • 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, if you drive the vehicle at a speed of 20 km/h (12 mph) or more in EV mode for 3 seconds or more, you can confirm this DTC.

PROCEDURE


  1. CHECK DTC OUTPUT (HYBRID CONTROL)


    1. Connect the GTS to the DLC3.

    2. Turn the ignition switch to ON (IG).

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

    4. Check if DTCs are output.

      Result
      Result Proceed to
      Only P0A0F-238 is output or P0A0F-238 and DTCs other than P0A1D are also output. A
      P0A0F-238 and P0A1D (hybrid vehicle control ECU circuit malfunction) are output. B

    5. Turn the ignition switch off.


    B

    GO TO DTC CHART (P0A1D) Click here

    A

  2. CHECK CRANKSHAFT PULLEY REVOLUTION (P POSITION)


    1. Check that the shift lever is in the P position.

    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 ignition switch to ON (READY) while performing this inspection. Be sure to turn the ignition 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 GTS to the DLC3.

    2. Turn the ignition switch to 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 ignition switch off.


    NEXT

  4. CHECK ENGINE RACING


    1. Connect the GTS to the DLC3.

    2. Turn the ignition switch to ON (READY).

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

    4. Read the Data List.

    5. A004EPME01
      *1 Malfunction
      *2 Normal
      *3 Engine

      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 MG1 REV
        Reference Value Approximately 1000 rpm Approximately 3600 rpm
        Approximately 1500 rpm Approximately 5400 rpm
        Approximately 2500 rpm Approximately 9000 rpm

    6. Turn the ignition switch off.


    NG

    REPLACE HYBRID VEHICLE TRANSAXLE ASSEMBLY Click here

    OK

  5. CHECK CREEP MOVEMENT


    1. Turn the ignition switch to 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 ignition switch off.


    NG

    REPLACE HYBRID VEHICLE TRANSAXLE ASSEMBLY Click here

    OK

  6. CHECK ENGINE SPEED


    1. Connect the GTS to the DLC3.

    2. Turn the ignition switch to 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 when the vehicle speed is 10 km/h (6 mph) or more.

      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 + 0.27 X Motor (MG2) Revolution is 500 rpm or more and it is maintained for 1 second.

      Tech Tips

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

    7. Turn the ignition switch off.


    OK

    REPLACE HYBRID VEHICLE CONTROL ECU Click here

    NG

    REPLACE TRANSMISSION INPUT DAMPER ASSEMBLY 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 ignition switch to ON (READY) while performing this inspection. Be sure to turn the ignition 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.


    OK

    REPLACE HYBRID VEHICLE TRANSAXLE ASSEMBLY Click here

    NG

    REPAIR OR REPLACE ENGINE