DTC P0A0F:00 [PCM (SKYACTIV-D)]

System malfunction location	Engine failed to restart
Detection condition	• Any of following conditions occurs: ― When the engine should restart after it is stopped by the i-stop control, it does not start even though it is cranked for 3 s or more. ― When the engine should restart after it is stopped by the i-stop control, it does not cranked.
Fail-safe	• Inhibits engine-stop by operating the i-stop function.
Possible cause	• Related parts malfunction ― Starter relay malfunction ― Battery malfunction ― Wiring harness malfunction between starter relay and PCM, or poor connector contact ― Starter malfunction • Common rail system malfunction • Piston stop position malfunction during idling stop ― CKP sensor signal malfunction ― Intake air system related malfunction (air suction, vacuum hose breakage) ― HP-EGR control malfunction ― LP-EGR control malfunction • Mechanical (engine) malfunction ― Improper valve timing • PCM malfunction
System wiring diagram	• Not applicable
Connector diagram	• Not applicable

System malfunction location

Engine failed to restart

Detection condition

• Any of following conditions occurs:

― When the engine should restart after it is stopped by the i-stop control, it does not start even though it is cranked for 3 s or more.

― When the engine should restart after it is stopped by the i-stop control, it does not cranked.

Fail-safe

• Inhibits engine-stop by operating the i-stop function.

Possible cause

• Related parts malfunction

― Starter relay malfunction

― Battery malfunction

― Wiring harness malfunction between starter relay and PCM, or poor connector contact

― Starter malfunction

• Common rail system malfunction

• Piston stop position malfunction during idling stop

― CKP sensor signal malfunction

― Intake air system related malfunction (air suction, vacuum hose breakage)

― HP-EGR control malfunction

― LP-EGR control malfunction

• Mechanical (engine) malfunction

― Improper valve timing

• PCM malfunction

System wiring diagram

• Not applicable

Connector diagram

• Not applicable

Step	Inspection	Results	Action
1	RECORD VEHICLE STATUS WHEN DTC WAS DETECTED TO UTILIZE WITH REPEATABILITY VERIFICATION • Record the freeze frame data/snapshot data. Note • Recording can be facilitated using the screen capture function of the PC.	—	Go to the next step.
2	VERIFY RELATED REPAIR INFORMATION OR SERVICE INFORMATION AVAILABILITY • Verify related Service Bulletins, on-line repair information, or Service Information availability. • Is any related Information available?	Yes	Perform repair or diagnosis according to the available information. • If the vehicle is not repaired, go to the next step.
No	Go to the next step.
3	INSPECT FOR OTHER RELATED DTCs • Perform the DTC inspection for the PCM. (See DTC INSPECTION.) • Are any of the following DTCs displayed? ― P1260:00	Yes	Repair the malfunctioning location according to the applicable DTC troubleshooting. (See DTC P1260:00 [PCM (SKYACTIV-D)].)
No	Go to the next step.
4	INSPECT FOR A MALFUNCTION RELATED INABILITY TO START ENGINE • Start the engine. • Does the engine start normally?	Yes	Go to the next step.
No	Perform the applicable symptom troubleshooting. (See WILL NOT CRANK [SKYACTIV-D].) (See HARD TO START/LONG CRANK/ERRATIC START/ERRATIC CRANK [SKYACTIV-D].)
5	INSPECT COMMON RAIL SYSTEM OPERATION • Inspect the common rail operation. (See COMMON RAIL INSPECTION [SKYACTIV-D 1.8].) • Is there any malfunction?	Yes	Repair or replace the malfunctioning location and perform the repair completion verification. (See COMMON RAIL REMOVAL/INSTALLATION [SKYACTIV-D 1.8].)
No	Go to the next step.
6	DETERMINE IF MALFUNCTION IS CAUSED BY ROUGH IDLING OR A PISTON-STOP POSITION CONTROL MALFUNCTION • Start the engine and warm it up completely. • Is the idle speed stabilized?	Yes	Go to the next step.
No	Go to Step 8.
7	INSPECT CKP SENSOR SIGNAL • Verify the PCM terminal 1E signal using the oscilloscope. (See PCM INSPECTION [SKYACTIV-D 1.8].) • Is there any malfunction?	Yes	Visually inspect the CKP sensor pulse wheel. • If there is any malfunction: ― Replace the CKP sensor pulse wheel, then go to repair completion verification. • If there is no malfunction: ― Replace the CKP sensor, then go to repair completion verification. (See CRANKSHAFT POSITION (CKP) SENSOR REMOVAL/INSTALLATION [SKYACTIV-D 1.8].)
No	Go to repair completion verification.
8	INSPECT VACUUM HOSE CONNECTION • Inspect the vacuum hose routine. (See INTAKE-AIR SYSTEM VACUUM HOSE ROUTING DIAGRAM [SKYACTIV-D 1.8].) • Are vacuum hoses routines properly?	Yes	Go to the next step.
No	Reconnect the vacuum hose, then go to repair completion verification. (See INTAKE-AIR SYSTEM REMOVAL/INSTALLATION [SKYACTIV-D 1.8].)
9	INSPECT INTAKE-AIR SYSTEM FOR AIR SUCTION • Inspect the following parts of the intake air system for looseness, damage, and loss. ― Between air cleaner and intake manifold • Is there any leakage?	Yes	Repair or replace the malfunctioning location and perform the repair completion verification.
No	Go to the next step.
10	INSPECT HP-EGR CONTROL VALVE CONTROL SYSTEM OPERATION • Perform the HP-EGR Control Valve Operation Inspection. (See ENGINE CONTROL SYSTEM OPERATION INSPECTION [SKYACTIV-D].) • Is there any malfunction?	Yes	Repair or replace the malfunctioning location and perform the repair completion verification. (See HP-EGR CONTROL VALVE REMOVAL/INSTALLATION [SKYACTIV-D 1.8].)
No	Go to the next step.
11	INSPECT LP-EGR CONTROL VALVE CONTROL SYSTEM OPERATION • Perform the LP-EGR Control Valve Operation Inspection. (See ENGINE CONTROL SYSTEM OPERATION INSPECTION [SKYACTIV-D].) • Is there any malfunction?	Yes	Repair or replace the malfunctioning location and perform the repair completion verification. (See LP-EGR CONTROL VALVE REMOVAL/INSTALLATION [SKYACTIV-D 1.8].)
No	Go to the next step.
12	INSPECT TIMING CHAIN INSTALLATION CONDITION • Verify the condition of the timing chain assembly (valve timing, looseness, jumping). (See TIMING CHAIN REMOVAL/INSTALLATION [SKYACTIV-D 1.8].) • Is there any malfunction?	Yes	Repair or replace the malfunctioning part according to the inspection results. Assemble the timing chain using the correct timing, then go to repair completion verification. (See TIMING CHAIN REMOVAL/INSTALLATION [SKYACTIV-D 1.8].)
No	Go to the next step.
Repair completion verification 1	VERIFY THAT VEHICLE IS REPAIRED • Install/connect the part removed/disconnected during the troubleshooting procedure. • Clear the DTC recorded in the memory. (See CLEARING DTC.) • Replicate the vehicle conditions at the time the DTC was detected using the following procedure. • Always reconnect all disconnected connectors. • Clear the DTC from the PCM memory using the M-MDS. (See CLEARING DTC.) • Start the engine and warm it up completely. Caution • While performing this step, always operate the vehicle in a safe and lawful manner. • When the M-MDS is used to observe monitor system status while driving, be sure to have another technician with you, or record the data in the M-MDS using the PID/DATA MONITOR AND RECORD capturing function and inspect later. • Drive the vehicle under the FREEZE FRAME DATA/snapshot data condition. • Perform the DTC inspection for the PCM. (See DTC INSPECTION.) • Is the same Pending DTC present?	Yes	Refer to the controller area network (CAN) malfunction diagnosis flow to inspect for a CAN communication error. (See CONTROLLER AREA NETWORK (CAN) MALFUNCTION DIAGNOSIS FLOW [(E)].) If the CAN communication is normal, perform the diagnosis from Step 1. • If the malfunction recurs, replace the PCM, then go to the next step. (See PCM REMOVAL/INSTALLATION [SKYACTIV-D 1.8].)
No	Go to the next step.
Repair completion verification 2	VERIFY IF OTHER DTCs DISPLAYED • Perform the DTC inspection. (See DTC INSPECTION.) • Are any other DTCs displayed?	Yes	Repair the malfunctioning location according to the applicable DTC troubleshooting.
No	DTC troubleshooting completed.

Step

Inspection

Results

Action

RECORD VEHICLE STATUS WHEN DTC WAS DETECTED TO UTILIZE WITH REPEATABILITY VERIFICATION

• Record the freeze frame data/snapshot data.

Note

• Recording can be facilitated using the screen capture function of the PC.

—

Go to the next step.

VERIFY RELATED REPAIR INFORMATION OR SERVICE INFORMATION AVAILABILITY

• Verify related Service Bulletins, on-line repair information, or Service Information availability.

• Is any related Information available?

Yes

Perform repair or diagnosis according to the available information.

• If the vehicle is not repaired, go to the next step.

Go to the next step.

INSPECT FOR OTHER RELATED DTCs

• Perform the DTC inspection for the PCM.

(See DTC INSPECTION.)

• Are any of the following DTCs displayed?

― P1260:00

Yes

Repair the malfunctioning location according to the applicable DTC troubleshooting.

(See DTC P1260:00 [PCM (SKYACTIV-D)].)

Go to the next step.

INSPECT FOR A MALFUNCTION RELATED INABILITY TO START ENGINE

• Start the engine.

• Does the engine start normally?

Yes

Go to the next step.

Perform the applicable symptom troubleshooting.

(See WILL NOT CRANK [SKYACTIV-D].)

(See HARD TO START/LONG CRANK/ERRATIC START/ERRATIC CRANK [SKYACTIV-D].)

INSPECT COMMON RAIL SYSTEM OPERATION

• Inspect the common rail operation.

(See COMMON RAIL INSPECTION [SKYACTIV-D 1.8].)

• Is there any malfunction?

Yes

Repair or replace the malfunctioning location and perform the repair completion verification.

(See COMMON RAIL REMOVAL/INSTALLATION [SKYACTIV-D 1.8].)

Go to the next step.

DETERMINE IF MALFUNCTION IS CAUSED BY ROUGH IDLING OR A PISTON-STOP POSITION CONTROL MALFUNCTION

• Start the engine and warm it up completely.

• Is the idle speed stabilized?

Yes

Go to the next step.

Go to Step 8.

INSPECT CKP SENSOR SIGNAL

• Verify the PCM terminal 1E signal using the oscilloscope.

(See PCM INSPECTION [SKYACTIV-D 1.8].)

• Is there any malfunction?

Yes

Visually inspect the CKP sensor pulse wheel.

• If there is any malfunction:

― Replace the CKP sensor pulse wheel, then go to repair completion verification.

• If there is no malfunction:

― Replace the CKP sensor, then go to repair completion verification.

(See CRANKSHAFT POSITION (CKP) SENSOR REMOVAL/INSTALLATION [SKYACTIV-D 1.8].)

Go to repair completion verification.

INSPECT VACUUM HOSE CONNECTION

• Inspect the vacuum hose routine.

(See INTAKE-AIR SYSTEM VACUUM HOSE ROUTING DIAGRAM [SKYACTIV-D 1.8].)

• Are vacuum hoses routines properly?

Yes

Go to the next step.

Reconnect the vacuum hose, then go to repair completion verification.

(See INTAKE-AIR SYSTEM REMOVAL/INSTALLATION [SKYACTIV-D 1.8].)

INSPECT INTAKE-AIR SYSTEM FOR AIR SUCTION

• Inspect the following parts of the intake air system for looseness, damage, and loss.

― Between air cleaner and intake manifold

• Is there any leakage?

Yes

Repair or replace the malfunctioning location and perform the repair completion verification.

Go to the next step.

INSPECT HP-EGR CONTROL VALVE CONTROL SYSTEM OPERATION

• Perform the HP-EGR Control Valve Operation Inspection.

(See ENGINE CONTROL SYSTEM OPERATION INSPECTION [SKYACTIV-D].)

• Is there any malfunction?

Yes

Repair or replace the malfunctioning location and perform the repair completion verification.

(See HP-EGR CONTROL VALVE REMOVAL/INSTALLATION [SKYACTIV-D 1.8].)

Go to the next step.

INSPECT LP-EGR CONTROL VALVE CONTROL SYSTEM OPERATION

• Perform the LP-EGR Control Valve Operation Inspection.

(See ENGINE CONTROL SYSTEM OPERATION INSPECTION [SKYACTIV-D].)

• Is there any malfunction?

Yes

Repair or replace the malfunctioning location and perform the repair completion verification.

(See LP-EGR CONTROL VALVE REMOVAL/INSTALLATION [SKYACTIV-D 1.8].)

Go to the next step.

INSPECT TIMING CHAIN INSTALLATION CONDITION

• Verify the condition of the timing chain assembly (valve timing, looseness, jumping).

(See TIMING CHAIN REMOVAL/INSTALLATION [SKYACTIV-D 1.8].)

• Is there any malfunction?

Yes

Repair or replace the malfunctioning part according to the inspection results.

Assemble the timing chain using the correct timing, then go to repair completion verification.

(See TIMING CHAIN REMOVAL/INSTALLATION [SKYACTIV-D 1.8].)

Go to the next step.

Repair completion verification 1

VERIFY THAT VEHICLE IS REPAIRED

• Install/connect the part removed/disconnected during the troubleshooting procedure.

• Clear the DTC recorded in the memory.

(See CLEARING DTC.)

• Replicate the vehicle conditions at the time the DTC was detected using the following procedure.

• Always reconnect all disconnected connectors.

• Clear the DTC from the PCM memory using the M-MDS.

(See CLEARING DTC.)

• Start the engine and warm it up completely.

Caution

• While performing this step, always operate the vehicle in a safe and lawful manner.

• When the M-MDS is used to observe monitor system status while driving, be sure to have another technician with you, or record the data in the M-MDS using the PID/DATA MONITOR AND RECORD capturing function and inspect later.

• Drive the vehicle under the FREEZE FRAME DATA/snapshot data condition.

• Perform the DTC inspection for the PCM.

(See DTC INSPECTION.)

• Is the same Pending DTC present?

Yes

Refer to the controller area network (CAN) malfunction diagnosis flow to inspect for a CAN communication error.

(See CONTROLLER AREA NETWORK (CAN) MALFUNCTION DIAGNOSIS FLOW [(E)].)

If the CAN communication is normal, perform the diagnosis from Step 1.

• If the malfunction recurs, replace the PCM, then go to the next step.

(See PCM REMOVAL/INSTALLATION [SKYACTIV-D 1.8].)

Go to the next step.

Repair completion verification 2