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 transmission gear has seized, the hybrid vehicle control ECU will perform fail-safe control. Also, if a substance or object is preventing the engine or transmission 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	Engine does not start even though it is being cranked (transmission input malfunction [engine system])	Engine Hybrid vehicle transmission assembly Hybrid vehicle control ECU

Note

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.

INSPECTION PROCEDURE

PROCEDURE

CHECK DTC OUTPUT (ENGINE CONTROL SYSTEM)

Connect the intelligent tester to the DLC3.
Turn the power switch on (IG).
Select the following menu items: Powertrain / Engine and ECT / Trouble Codes.

Check if DTCs are output.

Result

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

GO TO DTC CHART Click here

CHECK DTC OUTPUT (HV)

Connect the intelligent tester to the DLC3.
Turn the power switch on (IG).
Select the following menu items: Powertrain / Hybrid Control / Trouble Codes.

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

GO TO DTC CHART Click here

INSPECT CRANKSHAFT PULLEY REVOLUTION (P POSITION)
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.
  
  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.
  
  OK
  
  The crankshaft rotates smoothly.
NG
CHECK CRANKSHAFT PULLEY REVOLUTION (N POSITION) Click here

OK
CLEAR DTC (HV)
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

OK
The crankshaft rotates smoothly.

CHECK READY INDICATOR ON

Select the following menu items: Powertrain / Hybrid Control / Data List / Generator (MG1) Rev, Engine Revolution.
Read the data list.

Depress the brake pedal and turn the power switch on (READY).

OK
The READY indicator comes on.

Tech Tips

If the READY indicator does not come on and the reading on the intelligent tester 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".

Data List	ENGINE REV	MG1 REV
Reference Value	Approximately 900 rpm	Approximately 3000 rpm
Reference Value	Approximately 1500 rpm	Approximately 5000 rpm

REPLACE HYBRID VEHICLE TRANSMISSION ASSEMBLY Click here

CHECK ENGINE RACING
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.
  
  Tech Tips
  
  If the engine does not rev up and the reading on the intelligent tester 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
REPLACE HYBRID VEHICLE TRANSMISSION ASSEMBLY Click here

OK
CHECK CREEP MOVEMENT
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
REPLACE HYBRID VEHICLE TRANSMISSION ASSEMBLY Click here

OK
INSPECT ENGINE SPEED
1. Connect the intelligent tester to the DLC3.
2. While driving at a vehicle speed of more than 10 km/h (6 mph), 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.
  
  Tech Tips
  
  If the engine over-revs or the reading on the intelligent tester shows DTC 3147-239 (hybrid vehicle transmission input malfunction [shaft damaged]), replace the transmission input damper.
NG
REPLACE HYBRID VEHICLE TRANSMISSION ASSEMBLY Click here

OK
SIMULATION TEST
1. Perform steps 3 through 8 again.
  
  OK
  
  The problem symptom is not reproduced.
NG
REPLACE HYBRID VEHICLE TRANSMISSION ASSEMBLY Click here

OK

REPLACE HYBRID VEHICLE CONTROL ECU Click here
CHECK CRANKSHAFT PULLEY REVOLUTION (N POSITION)
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.
  
  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.
  
  OK
  
  The crankshaft rotates smoothly.
NG
REPAIR OR REPLACE ENGINE ASSEMBLY

OK

REPLACE HYBRID VEHICLE TRANSMISSION ASSEMBLY Click here