DTC P0A0F-238: Engine Failed to Start: Procedure

WARNING: This page is about a different variant/trim than selected.

CHECK DTC OUTPUT (ENGINE CONTROL SYSTEM)
1. Connect the Techstream to the DLC3.
2. Turn the power switch on (IG).
3. Select the following menu items: Powertrain / Engine Control / Trouble Codes.
4. Check if DTCs are output.
  Result
  
  DTCs are output.
YES → GO TO DIAGNOSTIC TROUBLE CODE CHART DTC CHART

NO: Go to next step
CHECK CRANKSHAFT PULLEY REVOLUTION (P POSITION)
1. Turn the power switch off, move the shift lever to the P position, and lift up the vehicle.
2. Turn the crankshaft pulley by hand to check if the crankshaft rotates.
  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.
NG → See step 11

OK: Go to next step
CHECK HARNESS AND CONNECTOR (HYBRID VEHICLE CONTROL ECU - CRANKSHAFT POSITION SENSOR). Refer to PROCEDURE - Step 3
NG → REPAIR OR REPLACE HARNESS OR CONNECTOR

OK: Go to next step
INSPECT CRANKSHAFT POSITION SENSOR. Refer to PROCEDURE - Step 2
NG → REPLACE CRANKSHAFT POSITION SENSOR

OK: Go to next step
CHECK DTC OUTPUT (HV)
1. Connect the Techstream to the DLC3.
2. Select the following menu items: Powertrain / Hybrid Control / Trouble Codes.
3. Check if DTCs are output.
4. Confirm and record the DTCs, freeze frame data, and information for the HV system.
NEXT: Go to next step
CLEAR DTC
1. Connect the Techstream to the DLC3.
2. Select the following menu items: Powertrain / Hybrid Control / Trouble Codes.
3. Clear DTCs and freeze frame data.
NEXT: Go to next step

CHECK READY LIGHT ON

Connect the Techstream to the DLC3.
Turn the power switch on (IG).
Select the following menu items: Powertrain / Hybrid Control / Data List / Generator (MG1) Rev, Engine Spd.
Depress the brake pedal and turn the power switch on (READY).
OK

The READY light comes on.

HINT:
- If the READY light does not come on and the reading on the Techstream shows DTC P0A90-239 (hybrid vehicle transaxle input malfunction [shaft damaged]), or the READY light comes on and MG1 turns but the engine does not crank, replace the hybrid vehicle transaxle assembly.
- If this DTC (P0A0F-238) is output, the HV battery may be dead and DTC P3000-388 or P3000-389 may be output.

Refer to the graph for data list confirmation of "Generator (MG1) Rev" and "Engine Spd".

Fig 1: Identifying Engine Speed Graph

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

Engine speed	Generator speed
Approx. 900 RPM	Approx. 3,200 RPM
Approx. 1,500 RPM	Approx. 5,400 RPM

NG → See step 12

OK: Go to next step

CHECK ENGINE RACING
1. Connect the Techstream to the DLC3.
2. Turn the power switch on (IG).
3. Select the following menu items: Powertrain / Hybrid Control / Data List / Generator (MG1) Rev, Engine Spd.
4. While the READY light is on, depress the accelerator pedal for 10 seconds with the shift lever in the P position.
  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 transaxle input malfunction [shaft damaged]), or the generator turns but the engine does not crank, replace the hybrid vehicle transaxle assembly.
NG → See step 12

OK: Go to next step
CHECK CREEP MOVEMENT
1. Connect the Techstream to the DLC3.
2. Depress the brake pedal, move the shift lever to the D position, and release the brake pedal.
  OK
  
  The wheels turn (creeping along).
  
  HINT:
  
  If the wheels do not turn and the reading on the Techstream shows DTC P3147 (transaxle malfunction), replace the hybrid vehicle transaxle assembly.
NG → See step 12

OK: Go to next step
CHECK ENGINE SPEED
1. Connect the Techstream to the DLC3.
2. While driving at the vehicle speed of more than 6 mph (10 km/h), fully depress the accelerator pedal to raise the engine speed.
  OK
  
  Engine speed increases smoothly.
  
  HINT:
  
  If the engine over-revs or the reading on the Techstream shows DTC P3147-241 (transaxle input malfunction [torque limiter slipping]), replace the transmission input damper.
NG → REPLACE TRANSMISSION INPUT DAMPER ASSEMBLY

OK → See step 13
CHECK FRONT TIRE REVOLUTION
1. Lift up the vehicle.
2. Move the shift lever to the N position with the power switch off.
  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.
3. Turn the crank pulley by hand to check if the front tires rotate.
  OK
  
  The front tires do not rotate.
NG → CHECK AND REPAIR ENGINE

OK → See step 12
REPLACE HYBRID VEHICLE TRANSAXLE ASSEMBLY. Refer to REMOVAL
REPLACE HYBRID VEHICLE CONTROL ECU. Refer to REMOVAL