P0A0F-238 - Engine Failed to Start

HYBRID / BATTERY CONTROL: HYBRID CONTROL SYSTEM: P0A0F-238: Engine Failed to Start
P0A0F-238 - Engine Failed to Start

DESCRIPTION

If the power management control ECU (HV CPU) detects that the engine or transaxle 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 transaxle internal components from rotating, the power management control ECU (HV CPU) will perform fail-safe control.









INSPECTION PROCEDURE

HINT
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.

PROCEDURE

1. CHECK DTC OUTPUT (HYBRID CONTROL)

(a) Connect the Techstream to the DLC3.

(b) Turn the power switch on (IG).

(c) Enter the following menus: Powertrain / Hybrid Control / Trouble Codes.

(d) Check if DTCs are output.

Result:





(e) Turn the power switch off.

B -- GO TO DTC CHART (HYBRID CONTROL SYSTEM) Hybrid Control System
A -- Continue to next step.

2. CHECK CRANKSHAFT PULLEY REVOLUTION (PARK (P) SELECTED)

(a) Push the P position switch.

(b) Lift up the vehicle.

(c) 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.

NOTICE:
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)
OK -- Continue to next step.

3. CLEAR DTC

(a) Connect the Techstream to the DLC3.

(b) Turn the power switch on (IG).

(c) Enter the following menus: Powertrain / Hybrid Control / Trouble Codes.

(d) Read and record the DTCs and freeze frame data.

(e) Clear DTCs and freeze frame data.

(f) Turn the power switch off.

NEXT -- Continue to next step.

4. CHECK ENGINE RACING

(a) Connect the Techstream to the DLC3.

(b) Turn the power switch on (IG).

(c) Push the P position switch.

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

(e) Read the Data List.

(f) Turn the power switch on (READY).

(g) 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.

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









(h) Turn the power switch off.

NG -- REPLACE HYBRID VEHICLE TRANSAXLE ASSEMBLY Components
OK -- Continue to next step.

5. CHECK CREEP MOVEMENT

(a) Turn the power switch on (READY).

(b) Depress the brake pedal, move the shift lever to D, and release the brake pedal.

OK:

The wheels turn (the vehicle creeps forward).

(c) Turn the power switch off.

NG -- REPLACE HYBRID VEHICLE TRANSAXLE ASSEMBLY Components
OK -- Continue to next step.

6. INSPECT ENGINE SPEED

(a) Connect the Techstream to the DLC3.

(b) Turn the power switch on (READY).

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

(d) Read the Data List.

(e) Move the shift lever to D.

(f) Fully depress the accelerator pedal to accelerate the vehicle from a stop.

NOTICE:
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.

(g) Turn the power switch off.

NG -- REPLACE TRANSMISSION INPUT DAMPER ASSEMBLY Components
OK -- Continue to next step.

7. SIMULATION TEST

(a) Perform steps 2 through 6 again.

OK:

The problem symptom is not reproduced.

NG -- REPLACE HYBRID VEHICLE TRANSAXLE ASSEMBLY Components

OK -- REPLACE POWER MANAGEMENT CONTROL ECU Components

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

(a) Lift up the vehicle.

(b) Turn the power switch on (IG).

(c) Move the shift lever to N.

(d) 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 on (IG) before performing this inspection, to prevent the engine from starting.

NOTICE:
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 Components