P0A0F-238

P112 HYBRID VEHICLE CONTROL: HYBRID CONTROL SYSTEM: P0A0F-238: Engine Failed to Start

DTC P0A0F-238 - Engine Failed to Start

DESCRIPTION

The HV 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.






WIRING DIAGRAM





INSPECTION PROCEDURE
HINT:
- If this DTC is output, the engine or gears in the transaxle may have seized or foreign objects have been caught in either of them. Therefore, check the engine oil, ATF and coolant levels.
- If this DTC is stored, it is necessary to clear the DTCs before turning the power switch on (READY).

PROCEDURE

1. READ OUTPUT DTC (ENGINE)
(a) Connect the Techstream to the DLC3.
(b) Turn the power switch ON (IG).
(c) Enter the following menus: Powertrain / Engine Control / Trouble Codes.
(d) Check if DTCs are output.
Result:
DTCs are output
YES -- GO TO RELEVANT DTC CHART
NO -- Continue to next step.

2. CHECK CRANKSHAFT PULLEY REVOLUTION
(a) Turn the power switch OFF.
(b) Jack up the vehicle.
(c) Manually turn the crankshaft pulley to check if the crankshaft rotates.
OK:
The crankshaft rotates
NG -- CHECK FRONT TIRE REVOLUTION
OK -- Continue to next step.

3. CHECK HARNESS AND CONNECTOR (ECM - CRANKSHAFT POSITION SENSOR)




(a) Disconnect the E4 ECM connector.




(b) Disconnect the C7 crankshaft position sensor connector.
(c) Measure the resistance between the wire harness side connectors.
Standard resistance (Check for open):






Standard resistance (Check for short)





(d) Reconnect the crankshaft position sensor connector.
(e) Reconnect the ECM connector.
NG -- REPAIR OR REPLACE HARNESS OR CONNECTOR
OK -- Continue to next step.

4. CHECK HARNESS AND CONNECTOR (HYBRID VEHICLE CONTROL ECU - ECM)




(a) Disconnect the H16 HV control ECU connector.




(b) Disconnect the E7 ECM connector.
(c) Measure the resistance between the wire harness side connectors.
Standard resistance (Check for open):





Standard resistance (Check for short)





(d) Reconnect the ECM connector.
(e) Reconnect the HV control ECU connector.
NG -- REPAIR OR REPLACE HARNESS OR CONNECTOR
OK -- Continue to next step.

5. CHECK AND CLEAR DTC (HV ECU)
(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 and record the DTCs, the freeze frame data, and the information.
(e) Clear the DTCs of the HV ECU.
NEXT -- Continue to next step.

6. CHECK READY LIGHT
(a) Connect the Techstream to the DLC3.
(b) Turn the power switch ON (IG).
(c) Enter the following menus: Powertrain / Engine Control / Data List.
(d) Read the Generator (MG1) Rev and Engine Spd values.
(e) Turn the power switch ON (READY).
OK:
READY light turns ON
HINT: If the READY light does not turn ON, and the reading on the Techstream shows DTC P0A90 (INF 239) (HV transaxle input malfunction [shaft damaged]), or the MG1 turns but the engine does not crank, replace the hybrid vehicle transaxle assembly.

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

7. CHECK ENGINE REVOLUTION-UP
(a) Connect the Techstream to the DLC3.
(b) Turn the power switch ON (IG).
(c) Enter the following menus: Powertrain / Engine Control / Data List.
(d) Read the Generator (MG1) Rev and Engine Spd values.
(e) With the READY light turned ON, depress the accelerator pedal for 10 seconds while the shift position is in P.
OK:
The engine revs up
HINT: If the engine does not rev up, and the reading on the Techstream shows DTC P0A90 (INF 239) (HV transaxle input malfunction [shaft damaged]), or the MG1 turns but the engine does not crank, replace the hybrid vehicle transaxle assembly.

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

8. CHECK CREEP MOVEMENT
(a) Connect the Techstream to the DLC3.
(b) Turn the power switch ON (READY).
(c) Jack up the vehicle.
(d) Depress the brake pedal, move the selector lever to the D position, and release the brake pedal.
OK:
The wheels turn (creep movement)
HINT: If the wheels do not turn, and the reading on the Techstream shows DTC P0A90 (INF 602) (HV transaxle output malfunction), replace the hybrid vehicle transaxle assembly.

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

9. CHECK ENGINE ACCELERATION 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:
The engine speed increases smoothly
HINT: If the engine over-revs or the reading on the Techstream shows DTC P0A90 (INF 241) (HV transaxle input malfunction [torque limiter slipping]), replace the transmission input damper.

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

10. CHECK CAUSE OF INCREASE IN REVOLUTION RESISTANCE
(a) Investigate what has caused the revolution resistance of the transaxle and engine to become greater.
(1) Check the engine lubrication system and transaxle lubrication system.
(2) Check the engine coolant and transaxle coolant.
(3) Check for any breakdowns in the engine and transaxle.
Result:
There is no fault
NO -- REPAIR MALFUNCTIONING PARTS AND COMPONENTS
YES -- PERFORM SIMULATION TEST. IF SYMPTOM IS NOT REPRODUCED, REPLACE ENGINE, HV TRANSAXLE AND HV CONTROL ECU
11. CHECK FRONT TIRE REVOLUTION
(a) Turn the power switch ON (IG).
(b) Depress the brake pedal, move the selector lever to the N position.
(c) Jack up the vehicle.
(d) Manually turn the crankshaft pulley to check if the front tires rotate.
OK:
The front tires rotate
NG -- REPAIR OR REPLACE ENGINE ASSEMBLY
OK -- REPAIR OR REPLACE HYBRID VEHICLE TRANSAXLE ASSEMBLY