Lexus NX manuals

Lexus NX: Engine Failed to Start (P0A0F-238)

Lexus NX Service Manual / Engine & Hybrid System / 2ar-fxe (hybrid / Battery Control) / Hybrid Control System / Engine Failed to Start (P0A0F-238)

DESCRIPTION

If the hybrid vehicle control ECU detects that the engine or transaxle gear has seized, the hybrid vehicle control ECU will perform fail-safe control. Also, if a substance or object is preventing the engine or transaxle internal components from rotating, the hybrid vehicle control ECU will perform fail-safe control.

DTC No.

Detection Item

DTC Detection Condition

Trouble Area

MIL

Warning Indicate

P0A0F-238

Engine Failed to Start

The engine does not start even though it is being cranked (transaxle input circuit malfunction (engine system))

(1 trip detection logic)
  • Hybrid vehicle transaxle assembly
  • Transmission input damper assembly
  • Hybrid vehicle control ECU
  • Engine

Does not come on

Master Warning Light:

Comes on
Related Data List

DTC No.

ECU Data List

P0A0F-238
  • Vehicle Spd
  • Engine Revolution
  • Generator(MG1) Torq
  • Generator(MG1) Rev
  • Motor(MG2) Revolution

CAUTION / NOTICE / HINT

HINT:

  • A seized engine, mechanical malfunction of the hybrid vehicle transaxle can be suspected.
  • If this DTC is output, the engine or gears in the transaxle may have seized or foreign matter have been caught in either of them. Therefore, check the engine oil, ATF and coolant levels.
  • After the repair, clear the DTCs and perform the following procedure to check that DTCs are not output.
    1. While driving the vehicle at a speed of 20 km/h (12 mph) or more in EV mode, depress the accelerator pedal to start the engine, and drive the vehicle for 3 seconds or more.*1
      • *1: When the HV system is normal, the engine starts when the accelerator pedal is depressed halfway or more. If the HV system is malfunctioning, the engine may not start. Even in this case, drive the vehicle at a speed of 20 km/h (12 mph) or more in EV mode for 3 seconds or more.

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 for DTCs.

Powertrain > Hybrid Control > Trouble Codes

Result

Proceed to

Only DTC P0A0F-238 is output or any DTCs other than P0A1D (Hybrid Powertrain Control Module) are also output.

A

P0A1D (Hybrid Powertrain Control Module) is output.

B

(e) Turn the power switch off.

B

GO TO DTC CHART (HYBRID CONTROL SYSTEM)

A

2.

CHECK CRANKSHAFT PULLEY REVOLUTION (P POSITION)

(a) Check that the shift lever is in P.

(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.

(d) Lower the vehicle.

NG

GO TO STEP 7

OK

3.

CLEAR DTC

Click here

NEXT

4.

CHECK ENGINE RACING

(a) Connect the Techstream to the DLC3.

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

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

Powertrain > Hybrid Control > Data List

Tester Display

Engine Revolution

Generator(MG1) Rev

(d) Read the Data List.

(e) While the READY indicator is on, depress the accelerator pedal for 10 seconds.

OK:

"Generator (MG1) Rev" is approximately 3.6 times "Engine Revolution".

HINT:

  • If the engine does not race and DTC P3147-239 (Transmission system) is output or generator (MG1) operates but the engine does not crank, replace the hybrid vehicle transaxle assembly.
  • Refer to the graph for Data List confirmation of "Generator (MG1) Rev" and " Engine Revolution".

Data List

Engine Rev

Generator (MG1) Rev

Reference Value

Approximately 1000 rpm

Approximately 3600 rpm

Approximately 1500 rpm

Approximately 5400 rpm

Approximately 2500 rpm

Approximately 9000 rpm

(f) Turn the power switch off.

NG

REPLACE HYBRID VEHICLE TRANSAXLE ASSEMBLY

OK

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

OK

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.

Powertrain > Hybrid Control > Data List

Tester Display

Engine Revolution

Motor(MG2) Revolution

Generator(MG1) Rev

(d) Read the Data List.

(e) Move the shift lever to D.

(f) Fully depress the accelerator pedal when the vehicle speed is 10 km/h (6 mph) or more.

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 + 0.29 X Motor (MG2) Revolution" is 500 rpm or more and it is maintained for 1 second.

HINT:

If the engine races or DTC P3147-241 (Transmission system) is output, replace the transmission input damper assembly.

(g) Turn the power switch off.

OK

REPLACE HYBRID VEHICLE CONTROL ECU

NG

REPLACE TRANSMISSION INPUT DAMPER ASSEMBLY

7.

CHECK CRANKSHAFT PULLEY REVOLUTION (N POSITION)

(a) Lift up the vehicle.

(b) Move the shift lever to N.

(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.

(d) Lower the vehicle.

OK

REPLACE HYBRID VEHICLE TRANSAXLE ASSEMBLY

NG

REPAIR OR REPLACE ENGINE

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