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

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Outline

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 •  DTCs are stored in the following modules. (With Mazda M Hybrid) ―  Mazda M Hybrid battery ―  DC-DC converter (Mazda M Hybrid) ―  Integrated starter generator (ISG) •  Piston stop position malfunction during idling stop ―  Generator control malfunction (Without Mazda M Hybrid) ―  Decoupling ring tensioner malfunction (With Mazda M Hybrid) ―  ISG drive belt wear (With Mazda M Hybrid) ―  CKP sensor signal malfunction ―  Throttle valve operation malfunction (drive-by-wire control malfunction) ―  Intake air system related malfunction •  Air suction •  Evaporative hose, ventilation hose breakage (With Mazda M Hybrid) •  Vacuum hose, evaporative hose, ventilation hose breakage (Without Mazda M Hybrid) ―  Purge control malfunction ―  Generator drive belt wear (Without Mazda M Hybrid) ―  Engine starting system malfunction •  Mechanical (engine) malfunction ―  Improper intake valve timing ―  Improper operation of electric variable valve timing control system •  Electric variable valve timing driver malfunction •  Electric variable valve timing motor malfunction •  Electric variable valve timing actuator malfunction ―  Improper exhaust valve timing ―  Improper operation of hydraulic variable valve timing control system •  PCM malfunction
System wiring diagram	•  Not applicable
Connector diagram	•  Not applicable

Diagnostic Procedure

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-G)].)
		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-G (E)].) (See HARD TO START/LONG CRANK/ERRATIC START/ERRATIC CRANK [SKYACTIV-G (E)].) (See CRANKS NORMALLY BUT WILL NOT START [SKYACTIV-G (WITH Mazda M Hybrid)].) (See CRANKS NORMALLY BUT WILL NOT START [SKYACTIV-G (WITHOUT Mazda M Hybrid)].)
5	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	Vehicles with Mazda M Hybrid: •  Go to Step 7. Vehicles without Mazda M Hybrid: •  Go to the next step.
		No	Go to Step 14.
6	INSPECT GENERATOR CONTROL SYSTEM OPERATION •  Start the engine and let it idle. •  Access the ALT_VOLT_OUT_ACT PID using the M-MDS. (See PID/DATA MONITOR INSPECTION.) •  Does the PID value increase when the rear window defogger, headlights, and blower motor are operated simultaneously?	Yes	Go to Step 10.
		No	Inspect the following: •  Wiring harness between generator terminal 2B and PCM terminal 1BP •  Wiring harness between generator terminal 2A and PCM terminal 1AG •  Generator (See GENERATOR INSPECTION [SKYACTIV-G 2.5 (WITH CYLINDER DEACTIVATION)].) (See GENERATOR INSPECTION [SKYACTIV-G (WITHOUT CYLINDER DEACTIVATION (E))].) ―  If there is any malfunction: •  Repair or replace the malfunctioning location and perform the repair completion verification. (See GENERATOR REMOVAL/INSTALLATION [SKYACTIV-G 2.5 (WITH CYLINDER DEACTIVATION)].) (See GENERATOR REMOVAL/INSTALLATION [SKYACTIV-G (WITHOUT CYLINDER DEACTIVATION (E))].)
7	VERIFY DTCs •  Perform the DTC inspection for the following modules. (See DTC INSPECTION.) ―  PCM ―  Mazda M Hybrid battery ―  DC-DC converter (Mazda M Hybrid) ―  Integrated starter generator (ISG) •  Are any DTCs displayed?	Yes	Repair the malfunctioning location according to the applicable DTC troubleshooting. (See DTC TABLE [PCM (SKYACTIV-G (E))].) (See DTC TABLE [Mazda M Hybrid BATTERY].) (See DTC TABLE [DC-DC CONVERTER (Mazda M Hybrid)].) (See DTC TABLE [INTEGRATED STARTER GENERATOR (ISG)].)
		No	Go to the next step.
8	INSPECT DECOUPLING RING TENSIONER FOR MALFUNCTION •  Inspect the applicable part. (See DECOUPLING RING TENSIONER INSPECTION [SKYACTIV-G (WITH CYLINDER DEACTIVATION (E))].) •  Is the part normal?	Yes	Go to the next step.
		No	Repair or replace the malfunctioning location and perform the repair completion verification. (See DECOUPLING RING TENSIONER REMOVAL/INSTALLATION [SKYACTIV-G (WITH CYLINDER DEACTIVATION (E))].)
9	INSPECT ISG DRIVE BELT FOR MALFUNCTION •  Inspect the applicable part. (See DRIVE BELT INSPECTION [SKYACTIV-G (WITH CYLINDER DEACTIVATION (E))].) (See DRIVE BELT INSPECTION [SKYACTIV-G (WITHOUT CYLINDER DEACTIVATION (E))].) •  Is the part normal?	Yes	Go to the next step.
		No	Repair or replace the malfunctioning location and perform the repair completion verification. (See DRIVE BELT REMOVAL/INSTALLATION [SKYACTIV-G (WITH CYLINDER DEACTIVATION (E))].) (See DRIVE BELT REMOVAL/INSTALLATION [SKYACTIV-G (WITHOUT CYLINDER DEACTIVATION (E))].)
10	INSPECT CKP SENSOR SIGNAL •  Verify the CKP sensor signal using the oscilloscope. (See PCM INSPECTION [SKYACTIV-G (WITH CYLINDER DEACTIVATION (E))].) (See PCM INSPECTION [SKYACTIV-G (WITHOUT CYLINDER DEACTIVATION (E))].) •  Is there any malfunction?	Yes	Go to the next step.
		No	Go to Step 12.
11	INSPECT CKP SENSOR PULSE WHEEL •  Visually inspect the CKP sensor pulse wheel. •  Are there any damage or scratches at the CKP sensor pulse wheel?	Yes	Replace the CKP sensor pulse wheel and perform the repair completion verification.
		No	Inspect the wiring harness between the following terminals: •  CKP sensor terminal A—PCM terminal 1E •  CKP sensor terminal C—PCM terminal 1F •  CKP sensor terminal B—PCM terminal 1AP ―  If there is any malfunction: •  Repair or replace the malfunctioning location and perform the repair completion verification. ―  If there is no malfunction: •  Replace the CKP sensor and perform the repair completion verification. (See CRANKSHAFT POSITION (CKP) SENSOR REMOVAL/INSTALLATION [SKYACTIV-G (WITH CYLINDER DEACTIVATION (E))].) (See CRANKSHAFT POSITION (CKP) SENSOR REMOVAL/INSTALLATION [SKYACTIV-G (WITHOUT CYLINDER DEACTIVATION (E))].)
12	INSPECT DRIVE-BY-WIRE CONTROL SYSTEM OPERATION •  Perform the Drive-by-wire Control System Inspection. (See ENGINE CONTROL SYSTEM OPERATION INSPECTION [SKYACTIV-G (E)].) •  Is there any malfunction?	Yes	Repair or replace the malfunctioning location and perform the repair completion verification.
		No	Vehicles with Mazda M Hybrid: •  Go to repair completion verification. Vehicles without Mazda M Hybrid: •  Go to the next step.
13	INSPECT GENERATOR DRIVE BELT FOR MALFUNCTION •  Inspect the applicable part. (See DRIVE BELT INSPECTION [SKYACTIV-G (WITHOUT CYLINDER DEACTIVATION (E))].) •  Is the part normal?	Yes	Go to repair completion verification.
		No	Repair or replace the malfunctioning location and perform the repair completion verification. (See DRIVE BELT REMOVAL/INSTALLATION [SKYACTIV-G (WITHOUT CYLINDER DEACTIVATION (E))].)
14	INSPECT VACUUM HOSES CONNECTION •  Inspect the vacuum hose (such as evaporative hose, ventilation hose) routine. (With Mazda M Hybrid) Inspect the vacuum hose (such as vacuum hose, evaporative hose, ventilation hose) routine. (Without Mazda M Hybrid) (See VACUUM HOSE REMOVAL/INSTALLATION [SKYACTIV-G (WITH CYLINDER DEACTIVATION (E))].) (See VACUUM HOSE REMOVAL/INSTALLATION [SKYACTIV-G (WITHOUT CYLINDER DEACTIVATION (E))].) (See EMISSION SYSTEM LOCATION INDEX [SKYACTIV-G (WITH CYLINDER DEACTIVATION (E))].) (See EMISSION SYSTEM LOCATION INDEX [SKYACTIV-G (WITHOUT CYLINDER DEACTIVATION (E))].) (See INTAKE-AIR SYSTEM REMOVAL/INSTALLATION [SKYACTIV-G (WITH CYLINDER DEACTIVATION (E))].) (See INTAKE-AIR SYSTEM REMOVAL/INSTALLATION [SKYACTIV-G (WITHOUT CYLINDER DEACTIVATION (E))].) •  Are vacuum hoses routines properly?	Yes	Go to the next step.
		No	Reconnect the suspected hoses and perform the repair completion verification.
15	INSPECT INTAKE-AIR SYSTEM FOR AIR SUCTION •  Inspect for leakage in intake-air system. •  Is there any leakage?	Yes	Repair or replace the malfunctioning location and perform the repair completion verification.
		No	Go to the next step.
16	INSPECT PURGE CONTROL SYSTEM OPERATION •  Perform the Purge Control System Inspection. (See PURGE SOLENOID VALVE INSPECTION [SKYACTIV-G (WITH CYLINDER DEACTIVATION (E))].) (See PURGE SOLENOID VALVE INSPECTION [SKYACTIV-G (WITHOUT CYLINDER DEACTIVATION (E))].) •  Is there any malfunction?	Yes	Repair or replace the malfunctioning location and perform the repair completion verification. (See PURGE SOLENOID VALVE REMOVAL/INSTALLATION [SKYACTIV-G (WITH CYLINDER DEACTIVATION (E))].) (See PURGE SOLENOID VALVE REMOVAL/INSTALLATION [SKYACTIV-G (WITHOUT CYLINDER DEACTIVATION (E))].)
		No	Go to the next step.
17	INSPECT ELECTRIC VARIABLE VALVE TIMING DRIVER FOR MALFUNCTION •  Inspect the applicable part. (See ELECTRIC VARIABLE VALVE TIMING MOTOR/DRIVER INSPECTION [SKYACTIV-G (WITH CYLINDER DEACTIVATION (E))].) (See ELECTRIC VARIABLE VALVE TIMING MOTOR/DRIVER INSPECTION [SKYACTIV-G (WITHOUT CYLINDER DEACTIVATION (E))].) •  Is the part normal?	Yes	Go to the next step.
		No	Repair or replace the malfunctioning location and perform the repair completion verification. (See ELECTRIC VARIABLE VALVE TIMING MOTOR/DRIVER REMOVAL/INSTALLATION [SKYACTIV-G (WITH CYLINDER DEACTIVATION (E))].) (See ELECTRIC VARIABLE VALVE TIMING MOTOR/DRIVER REMOVAL/INSTALLATION [SKYACTIV-G (WITHOUT CYLINDER DEACTIVATION (E))].)
18	INSPECT ELECTRIC VARIABLE VALVE TIMING MOTOR FOR MALFUNCTION •  Inspect the applicable part. (See ELECTRIC VARIABLE VALVE TIMING MOTOR/DRIVER INSPECTION [SKYACTIV-G (WITH CYLINDER DEACTIVATION (E))].) (See ELECTRIC VARIABLE VALVE TIMING MOTOR/DRIVER INSPECTION [SKYACTIV-G (WITHOUT CYLINDER DEACTIVATION (E))].) •  Is the part normal?	Yes	Go to the next step.
		No	Repair or replace the malfunctioning location and perform the repair completion verification. (See ELECTRIC VARIABLE VALVE TIMING MOTOR/DRIVER REMOVAL/INSTALLATION [SKYACTIV-G (WITH CYLINDER DEACTIVATION (E))].) (See ELECTRIC VARIABLE VALVE TIMING MOTOR/DRIVER REMOVAL/INSTALLATION [SKYACTIV-G (WITHOUT CYLINDER DEACTIVATION (E))].)
19	INSPECT ELECTRIC VARIABLE VALVE TIMING ACTUATOR FOR MALFUNCTION •  Inspect the applicable part. (See ELECTRIC VARIABLE VALVE TIMING ACTUATOR INSPECTION [SKYACTIV-G (WITH CYLINDER DEACTIVATION (E))].) (See ELECTRIC VARIABLE VALVE TIMING ACTUATOR INSPECTION [SKYACTIV-G (WITHOUT CYLINDER DEACTIVATION (E))].) •  Is the part normal?	Yes	Go to the next step.
		No	Repair or replace the malfunctioning location and perform the repair completion verification. (See ELECTRIC VARIABLE VALVE TIMING ACTUATOR, HYDRAULIC VARIABLE VALVE TIMING ACTUATOR REMOVAL/INSTALLATION [SKYACTIV-G (WITH CYLINDER DEACTIVATION (E))].) (See ELECTRIC VARIABLE VALVE TIMING ACTUATOR, HYDRAULIC VARIABLE VALVE TIMING ACTUATOR REMOVAL/INSTALLATION [SKYACTIV-G (WITHOUT CYLINDER DEACTIVATION (E))].)
20	INSPECT HYDRAULIC VARIABLE VALVE TIMING CONTROL SYSTEM OPERATION •  Perform the Hydraulic Variable Valve Timing Control System Operation Inspection. (See OCV FOR HYDRAULIC VARIABLE VALVE TIMING SYSTEM INSPECTION [SKYACTIV-G (WITH CYLINDER DEACTIVATION (E))].) (See OIL CONTROL VALVE (OCV) INSPECTION [SKYACTIV-G (WITHOUT CYLINDER DEACTIVATION (E))].) •  Is there any malfunction?	Yes	Repair or replace the malfunctioning location and perform the repair completion verification.
		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. ―  Start the engine and warm it up completely. ―  Stop the engine by operating the i-stop function. ―  Restart the engine. ―  Perform the KOEO or KOER self test. (See DTC INSPECTION.) •  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-G (WITH CYLINDER DEACTIVATION (E))].) (See PCM REMOVAL/INSTALLATION [SKYACTIV-G (WITHOUT CYLINDER DEACTIVATION (E))].)
		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.