P0A0F-238

P311 HYBRID VEHICLE CONTROL: HYBRID CONTROL SYSTEM: P0A0F-238: Engine Failed to Start

DTC P0A0F-238 - Engine Failed to Start

DESCRIPTION

The hybrid vehicle control ECU detects this DTC and effects fail-safe control if the engine or transaxle gear has seized up, or foreign objects have been caught in either of them.





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





INSPECTION PROCEDURE
CAUTION:
- Before inspecting the high-voltage system or disconnecting the low voltage connector of the inverter with converter assembly, take safety precautions such as wearing insulated gloves and removing the service plug grip to prevent electrical shocks. After removing the service plug grip, put it in your pocket to prevent other technicians from accidentally reconnecting it while you are working on the high-voltage system.
- After disconnecting the service plug grip, wait for at least 10 minutes before touching any of the high-voltage connectors or terminals. After waiting for 10 minutes, check the voltage at the terminals in the inspection point in the inverter with converter assembly. The voltage should be 0 V before beginning work.
HINT: Waiting for at least 10 minutes is required to discharge the high-voltage capacitor inside the inverter with converter assembly.

PROCEDURE

1. CHECK DTC OUTPUT (ENGINE CONTROL SYSTEM)
(a) Connect the Techstream to the DLC3.
(b) Turn the power switch on (IG).
(c) Select the following menu items: Powertrain / Engine Control / Trouble Codes.
(d) Check if DTCs are output.
Result:
DTCs are output.
YES -- GO TO DTC CHART
NO -- Continue to next step.
2. CHECK CRANKSHAFT PULLEY REVOLUTION (P POSITION)
(a) Turn the power switch off, move the shift lever to the P position, and lift up the vehicle.
(b) Turn the crankshaft pulley by hand to check if the crankshaft rotates.
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.
NG -- CHECK FRONT TIRE REVOLUTION
OK -- Continue to next step.
3. CHECK HARNESS AND CONNECTOR (HYBRID VEHICLE CONTROL ECU - CRANKSHAFT POSITION SENSOR) P0335
NG -- REPAIR OR REPLACE HARNESS OR CONNECTOR
OK -- Continue to next step.
4. INSPECT CRANKSHAFT POSITION SENSOR P0335
NG -- REPLACE CRANKSHAFT POSITION SENSOR
OK -- Continue to next step.
5. CHECK DTC OUTPUT (HV)
(a) Connect the Techstream to the DLC3.
(b) Select the following menu items: Powertrain / Hybrid Control / Trouble Codes.
(c) Check if DTCs are output.
(d) Confirm and record the DTCs, freeze frame data, and information for the HV system.
NEXT -- Continue to next step.
6. CLEAR DTC
(a) Connect the Techstream to the DLC3.
(b) Select the following menu items: Powertrain / Hybrid Control / Trouble Codes.
(c) Clear DTCs and freeze frame data.
NEXT -- Continue to next step.
7. CHECK READY LIGHT ON
(a) Connect the Techstream to the DLC3.
(b) Turn the power switch on (IG).
(c) Select the following menu items: Powertrain / Hybrid Control / Data List / Generator (MG1) Rev, Engine Spd.
(d) 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.




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






NG -- REPLACE HYBRID VEHICLE TRANSAXLE ASSEMBLY
OK -- Continue to next step.
8. CHECK ENGINE RACING
(a) Connect the Techstream to the DLC3.
(b) Turn the power switch on (IG).
(c) Select the following menu items: Powertrain / Hybrid Control / Data List / Generator (MG1) Rev, Engine Spd.
(d) 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 -- REPLACE HYBRID VEHICLE TRANSAXLE ASSEMBLY
OK -- Continue to next step.
9. CHECK CREEP MOVEMENT
(a) Connect the Techstream to the DLC3.
(b) 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 -- REPLACE HYBRID VEHICLE TRANSAXLE ASSEMBLY
OK -- Continue to next step.
10. CHECK ENGINE SPEED
(a) Connect the Techstream to the DLC3.
(b) 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 -- REPLACE HYBRID VEHICLE CONTROL ECU
11. CHECK FRONT TIRE REVOLUTION
(a) Lift up the vehicle.
(b) Move the shift lever to the N position with the power switch off.
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.
(c) 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 -- REPLACE HYBRID VEHICLE TRANSAXLE ASSEMBLY