DTC P0A0F-238: Engine Failed to Start: Procedure

1. Connect the Techstream to the DLC3.
2. Turn the power switch on (IG).
3. Select the following menu items: Powertrain / Engine and ECT / Trouble Codes.
4. Check if DTCs are output.

   Result

   Result	Proceed to
   Engine control system DTCs are not output.	A
   Engine control system DTCs are output.	B

B → See step   11 

A: Go to next step 

1. Connect the Techstream to the DLC3.
2. Turn the power switch on (IG).
3. Select the following menu items: 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

B → See step   11 

A: Go to next step 

1. Turn the power switch off.
2. Move the shift lever to the P position.
3. Lift up the vehicle.
4. Turn the crankshaft pulley using hand tools to check if the crankshaft can rotate smoothly.
   WARNING:

   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.

   OK

   The crankshaft rotates smoothly.

NG → See step   10 

OK: Go to next step 

1. Turn the power switch on (IG).
2. Select the following menu items: Powertrain / Hybrid Control / Trouble Codes.
3. Read and record the DTCs and freeze frame data.
4. Select the following menu items: Powertrain / Hybrid Control / Trouble Codes.
5. Clear DTCs and freeze frame data.

NEXT: Go to next step 

1. Select the following menu items: Powertrain / Hybrid Control / Data List / Generator (MG1) Rev, Engine Revolution.
2. Read the data list.
3. Depress the brake pedal and turn the power switch on (READY).

   OK

   The READY indicator comes on.

   HINT: 

   • If the READY indicator does not come on and the reading on the Techstream shows DTC P3147-239 (hybrid vehicle transmission input malfunction [shaft damaged]), or if the READY indicator comes on and MG1 turns but the engine does not crank, replace the hybrid vehicle transmission assembly.
   • If this DTC (P0A0F-238) is output, the HV battery may be discharged and DTC P3000-388 or P3000-389 may be output.
   • Refer to the graph for data list confirmation of "Generator (MG1) Rev" and "Engine Revolution".
     Fig 1: Nomographic Chart

     Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

     Data List	Engine Revolution	Generator (MG1) Rev
     Reference Value	Approximately 900 rpm	Approximately 3000 rpm
     	Approximately 1500 rpm	Approximately 5000 rpm

NG → See step   12 

OK: Go to next step 

1. Turn the power switch on (IG).
2. Move the shift lever to the P position.
3. Select the following menu items: Powertrain / Hybrid Control / Data List / Generator (MG1) Rev, Engine Revolution.
4. Read the data list.
5. Turn the power switch on (READY).
6. While the READY indicator is on, fully depress the accelerator pedal for 10 seconds.

   OK

   The engine revs up.

   HINT: 

   If the engine does not rev up and the reading on the Techstream shows DTC P3147-239 (hybrid vehicle transmission input malfunction [shaft damaged]), or if MG1 turns but the engine does not crank, replace the hybrid vehicle transmission assembly.

NG → See step   12 

OK: Go to next step 

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

   OK

   The wheels turn (the vehicle creeps forward).

NG → See step   12 

OK: Go to next step 

1. Connect the Techstream to the DLC3.
2. While driving at a vehicle speed of more than 6 mph (10 km/h), fully depress the accelerator pedal to raise the engine speed.
   NOTE:

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

   OK

   Engine speed increases smoothly.

   HINT: 

   If the engine over-revs or the reading on the Techstream shows DTC 3147-239 (hybrid vehicle transmission input malfunction [shaft damaged]), replace the transmission input damper.

NG → See step   12 

OK: Go to next step 

1. Perform steps 3 through 8 again.

   OK

   The problem symptom does not recur.

NG → See step   12 

OK → See step   13 

1. Turn the power switch off.
2. Lift up the vehicle.
3. Move the shift lever to the N position.
4. Turn the crankshaft pulley using hand tools to check if the crankshaft can rotate smoothly.
   WARNING:

   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.

   OK

   The crankshaft rotates smoothly.

NG → REPAIR OR REPLACE ENGINE ASSEMBLY 

OK → See step   12