Diagnostic Procedure

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ENGINE STALLS-AFTER START/AT IDLE (PYUL) DIAGNOSTIC PROCEDURE

Step	Inspection	Results	Action
1	VERIFY TIMING OCCURRING MALFUNCTION Verify the symptom. Does the malfunction symptom occur just after the engine is started?	Yes	Perform the symptom troubleshooting [HARD TO START/LONG CRANK/ERRATIC START/ERRATIC CRANK]. (See HARD TO START/LONG CRANK/ERRATIC START/ERRATIC CRANK [PYUL] ).
1		No	Go to the next step.
2	VERIFY IF MALFUNCTION INCLUDES ROUGH IDLING Verify the symptom. Does the engine stall suddenly without any warning? (Does not include occurrence of rough idling)	Yes	Go to the next step.
2		No	Perform the symptom troubleshooting [ENGINE RUNS ROUGH/ROLLING IDLE]. (See ENGINE RUNS ROUGH/ROLLING IDLE [PYUL] ).
3	DETERMINE IF MALFUNCTION CAUSE IS OVERHEATING OR OTHER WARNING: Observe legal speed limits when driving the vehicle and perform the procedure in a location where safety can be assured. To prevent an accident, work with two people when the vehicle is being driven (one person drives vehicle, other person operates M-MDS). Access the PCM PID [ECT] using the M-MDS. (See PID/DATA MONITOR INSPECTION .) Is the PID value less than 116°C {241°F} during driving?	Yes	Go to the next step.
3		No	The cause of this concern could be from the cooling system overheating. Perform the symptom troubleshooting [COOLING SYSTEM CONCERNS-OVERHEATING]. (See COOLING SYSTEM CONCERNS-OVERHEATING [PYUL] ).
4	VERIFY PCM DTCs Perform the DTC inspection for the PCM. (See DTC INSPECTION .) Are any DTCs displayed?	Yes	Repair or replace the malfunctioning location according to the applicable DTC troubleshooting. (See DTC TABLE [PCM (PYUL)] .)
4		No	Go to the next step.
5	VERIFY CURRENT INPUT SIGNAL STATUS WARNING: Observe legal speed limits when driving the vehicle and perform the procedure in a location where safety can be assured. To prevent an accident, work with two people when the vehicle is being driven (one person drives vehicle, other person operates M-MDS). Access the following PIDs using the M-MDS: (See PID/DATA MONITOR INSPECTION .) PCM: APP1 APP2 ECT ECT_VOLT MAF MAP MAP_VOLT A/F_SEN_CUR HO2S_OUT_VOLT SHRT_FUEL_TRIM LONG_FUEL_TRIM Do the PIDs indicate the correct values under the malfunction condition? (See PID/DATA MONITOR TABLE [PCM (PYUL)] .)	Yes	Go to the next step.
5		No	APP1, APP2 PIDs are not as specified: Inspect the APP sensor No. 1 and No. 2. (Refer to [ACCELERATOR PEDAL POSITION (APP) SENSOR INSPECTION ] in Service Information). ECT, ECT_VOLT PIDs are not as specified: Inspect the ECT sensor. (Refer to [ENGINE COOLANT TEMPERATURE (ECT) SENSOR INSPECTION ] in Service Information). MAF PID is not as specified: Inspect the MAF sensor. (Refer to [MASS AIR FLOW (MAF) SENSOR INSPECTION ] in Service Information). MAP, MAP_VOLT PIDs are not as specified: Inspect the MAP sensor. (Refer to [MANIFOLD ABSOLUTE PRESSURE (MAP) SENSOR INSPECTION ] in Service Information). A/F_SEN_CUR, SHRT_FUEL_TRIM, LONG_FUEL_TRIM PIDs are not as specified: Inspect the A/F sensor. (Refer to [AIR FUEL RATIO (A/F) SENSOR INSPECTION ] in Service Information). HO2S_OUT_VOLT PID is not as specified: Inspect the HO2S. (Refer to [HEATED OXYGEN SENSOR (HO2S) INSPECTION ] in Service Information). Repair or replace the malfunctioning location. If the malfunction remains: Perform the [Action for Non-repeatable Malfunction] procedure. (See TROUBLESHOOTING PROCEDURE .)
6	INSPECT WIRING HARNESS (INCLUDING CONNECTOR/TERMINAL) BETWEEN BATTERY AND MAIN RELAY FOR MALFUNCTION Inspect the applicable circuit. (See CIRCUIT INSPECTION .) (See CONNECTOR INSPECTION .) Is the circuit normal?	Yes	Go to the next step.
6		No	Repair or replace the malfunctioning location and perform the repair completion verification 1.
7	VERIFY PCM CONNECTOR FOR MALFUNCTION Inspect the applicable connector and terminal. (See CONNECTOR INSPECTION .) Are the connector and terminal normal?	Yes	Go to the next step.
7		No	Repair or replace the malfunctioning location and perform the repair completion verification 1.
8	INSPECT WIRING HARNESS (INCLUDING CONNECTOR/TERMINAL) BETWEEN MAIN RELAY AND PCM FOR MALFUNCTION Inspect the applicable circuit. (See CIRCUIT INSPECTION .) (See CONNECTOR INSPECTION .) Is the circuit normal?	Yes	Go to the next step.
8		No	Repair or replace the malfunctioning location and perform the repair completion verification 1.
9	VERIFY A/C SYSTEM FOR MALFUNCTION Verify the operation of the A/C system. Is the A/C system operation normal?	Yes	Go to the next step.
9		No	Perform the symptom troubleshooting [A/C OPERATION MALFUNCTION] and [A/C ON CONSTANTLY, OR A/C COMPRESSOR CONTINUES TO OPERATE].
10	DETERMINE IF MALFUNCTION CAUSE IS DRIVE-BY-WIRE CONTROL SYSTEM OR OTHER Will the engine run smoothly at part throttle?	Yes	Go to Step 12.
10		No	Go to the next step.
11	INSPECT DRIVE-BY-WIRE CONTROL SYSTEM OPERATION Perform [Electronic Control Throttle Operation Inspection]. (See ENGINE CONTROL SYSTEM OPERATION INSPECTION [PYUL] ). Does the drive-by-wire control system work properly?	Yes	Visually inspect the throttle body (damage/scratching). If there is any malfunction: Repair or replace the malfunctioning location and perform the repair completion verification 1. If there is no malfunction: Go to the next step.
11		No	Repair or replace the malfunctioning location and perform the repair completion verification 1.
12	INSPECT PURGE CONTROL SYSTEM OPERATION Perform [Purge Control System Inspection]. (Refer to [PURGE SOLENOID VALVE INSPECTION ] in Service Information). Does the purge solenoid valve work properly?	Yes	Go to the next step.
12		No	Repair or replace the malfunctioning location and perform the repair completion verification 1.
13	INSPECT WIRING HARNESS (INCLUDING CONNECTOR/TERMINAL) BETWEEN MAF SENSOR/IAT SENSOR No. 1 AND PCM FOR MALFUNCTION Inspect the applicable circuit. (See CIRCUIT INSPECTION .) (See CONNECTOR INSPECTION .) Is the circuit normal?	Yes	Go to the next step.
13		No	Repair or replace the malfunctioning location and perform the repair completion verification 1.
14	INSPECT PCM FOR POOR GROUND Verify the PCM ground point condition. Is there any ground point loose or lifting in the PCM?	Yes	Repair or replace the malfunctioning location and perform the repair completion verification 1.
14		No	Go to the next step.
15	INSPECT RELATED PART CONDITION Inspect the following: Poor fuel quality (proper octane, contamination, winter/summer blend) Intake-air system leakage or restriction Electrical connector disconnected Fuel leakage Vacuum leakage CKP sensor, intake CMP sensor and exhaust CMP sensor Installation condition (Refer to [CRANKSHAFT POSITION (CKP) SENSOR REMOVAL/INSTALLATION ] in Service Information). (Refer to [CAMSHAFT POSITION (CMP) SENSOR REMOVAL/INSTALLATION ] in Service Information). Damaged trigger wheel, intake camshaft and exhaust camshaft Is there any malfunction?	Yes	Repair or replace the malfunctioning location and perform the repair completion verification 1.
15		No	Go to the next step.
16	INSPECT FUEL PRESSURE (HIGH-SIDE) Start the engine and warm it up completely. Access the PCM PID [FUEL_PRES] using the M-MDS at idle. (See PID/DATA MONITOR INSPECTION .) Is the PID value within specification? Specification: Approx. 10 MPa {102 kgf/cm² , 1450 psi}	Yes	Go to Step 20.
16		No	Lower than specification: Inspect the following: Fuel leakage at the fuel line and fuel injector Fuel pump Perform [Fuel Pump (Low-pressure side) Operation Inspection]. (Refer to [HIGH PRESSURE FUEL PUMP INSPECTION ] in Service Information). Fuel pressure sensor (Refer to [FUEL PRESSURE SENSOR INSPECTION ] in Service Information). High pressure fuel pump (Refer to [HIGH PRESSURE FUEL PUMP INSPECTION ] in Service Information). If there is any malfunction: Repair or replace the malfunctioning location and perform the repair completion verification 1. If there is no malfunction: Go to Step 19. Higher than specification: Go to the next step.
17	DETERMINE IF MALFUNCTION CAUSE IS FUEL PRESSURE SENSOR OR HIGH PRESSURE FUEL PUMP Is the vehicle acceleration performance normal?	Yes	Go to the next step.
17		No	Go to Step 19.
18	VERIFY FUEL PRESSURE SENSOR FOR MALFUNCTION Inspect the applicable part. (Refer to [FUEL PRESSURE SENSOR INSPECTION ] in Service Information). Is the part normal?	Yes	Go to Step 20.
18		No	Replace the fuel distributor and perform the repair completion verification 1. (Refer to [FUEL INJECTOR REMOVAL/INSTALLATION ] in Service Information).
19	INSPECT WIRING HARNESS (INCLUDING CONNECTOR/TERMINAL) BETWEEN PCM AND SPILL VALVE CONTROL SOLENOID VALVE (HIGH PRESSURE FUEL PUMP) FOR MALFUNCTION Inspect the applicable circuit. (See CIRCUIT INSPECTION .) (See CONNECTOR INSPECTION .) Is the circuit normal?	Yes	Replace the high pressure fuel pump and perform the repair completion verification 1. (Refer to [HIGH PRESSURE FUEL PUMP REMOVAL/INSTALLATION ] in Service Information).
19		No	Repair or replace the malfunctioning location and perform the repair completion verification 1.
20	INSPECT FUEL PRESSURE (LOW-SIDE) Connect the fuel pressure gauge between fuel pump and high pressure fuel pump. Measure the low side fuel pressure. (Refer to [FUEL LINE PRESSURE INSPECTION ] in Service Information). Is the low side fuel pressure within specification? Specification: 475-555 kPa {4.85-5.65 kgf/cm² , 68.9-80.4 psi}	Yes	Go to the next step.
20		No	Inspect the following: Fuel line restriction Fuel filter clogged If there is any malfunction: Repair or replace the malfunctioning location and perform the repair completion verification 1. If there is no malfunction: Replace the fuel pump unit and perform the repair completion verification 1. (Refer to [FUEL PUMP UNIT REMOVAL/INSTALLATION ] in Service Information).
21	INSPECT FUEL INJECTOR OPERATION Perform [Fuel Injector Operation Inspection]. (Refer to [FUEL INJECTOR INSPECTION ] in Service Information). Do the fuel injectors operate properly?	Yes	Go to the next step.
21		No	Repair or replace the malfunctioning location and perform the repair completion verification 1.
22	INSPECT ENGINE COMPRESSION Measure the compression pressure for each cylinder. (Refer to [COMPRESSION INSPECTION ] in Service Information). Are compression pressures within specification?	Yes	Go to Step 28.
22		No	Go to the next step.
23	VERIFY ELECTRIC VARIABLE VALVE TIMING DRIVER FOR MALFUNCTION Inspect the applicable part. (Refer to [ELECTRIC VARIABLE VALVE TIMING MOTOR/DRIVER INSPECTION ] in Service Information). Is the part normal?	Yes	Go to the next step.
23		No	Repair or replace the malfunctioning location and perform the repair completion verification 1. (Refer to [ELECTRIC VARIABLE VALVE TIMING MOTOR/DRIVER REMOVAL/INSTALLATION ] in Service Information).
24	VERIFY ELECTRIC VARIABLE VALVE TIMING MOTOR FOR MALFUNCTION Inspect the applicable part. (Refer to [ELECTRIC VARIABLE VALVE TIMING MOTOR/DRIVER INSPECTION ] in Service Information). Is the part normal?	Yes	Go to the next step.
24		No	Repair or replace the malfunctioning location and perform the repair completion verification 1. (Refer to [ELECTRIC VARIABLE VALVE TIMING MOTOR/DRIVER REMOVAL/INSTALLATION ] in Service Information).
25	VERIFY ELECTRIC VARIABLE VALVE TIMING ACTUATOR FOR MALFUNCTION Inspect the applicable part. (Refer to [ELECTRIC VARIABLE VALVE TIMING ACTUATOR INSPECTION ] in Service Information). Is the part normal?	Yes	Go to the next step.
25		No	Repair or replace the malfunctioning location and perform the repair completion verification 1. (Refer to [ELECTRIC VARIABLE VALVE TIMING ACTUATOR REMOVAL/INSTALLATION ] in Service Information).
26	INSPECT HYDRAULIC VARIABLE VALVE TIMING CONTROL SYSTEM OPERATION Perform [Hydraulic Variable Valve Timing Control System Operation Inspection]. (Refer to [HYDRAULIC VARIABLE VALVE TIMING ACTUATOR INSPECTION ] in Service Information). Is there any malfunction?	Yes	Repair or replace the malfunctioning location and perform the repair completion verification 1.
26		No	Go to the next step.
27	INSPECT FOR MALFUNCTION DUE TO DEVIATED VALVE TIMING Inspect the valve timing (timing chain installation condition). (Refer to [TIMING CHAIN REMOVAL/INSTALLATION ] in Service Information). Is the valve timing normal?	Yes	Inspect for the following engine internal parts: Cylinder Piston ring Intake valve Exhaust valve Such as cylinder head gasket If there is any malfunction: Repair or replace the malfunctioning location and perform the repair completion verification 1.
27		No	Adjust the valve timing to the correct timing and perform the repair completion verification 1.
28	INSPECT IGNITION SYSTEM OPERATION Perform the Spark Test. (Refer to [SPARK INSPECTION ] in Service Information). Is a strong blue spark visible at each cylinder?	Yes	Go to the next step.
28		No	Repair or replace the malfunctioning location and perform the repair completion verification 1.
29	INSPECT EXHAUST SYSTEM FOR RESTRICTION Inspect for restriction in the exhaust system and the TWC. Is there any restriction?	Yes	Repair or replace the malfunctioning location and perform the repair completion verification 1.
29		No	Go to the next step.
30	INSPECT IF MALFUNCTION CAUSE IS PCV VALVE OR INJECTOR DRIVER (PCM INTEGRATED) Inspect the PCV valve. (Refer to [POSITIVE CRANKCASE VENTILATION (PCV) VALVE INSPECTION ] in Service Information). Is there any malfunction?	Yes	Replace the PCV valve and perform the repair completion verification 1. (Refer to [POSITIVE CRANKCASE VENTILATION (PCV) VALVE REMOVAL/INSTALLATION ] in Service Information).
30		No	Injector driver malfunction. Replace the PCM. (Refer to [PCM REMOVAL/INSTALLATION ] in Service Information). If the problem remains, overhaul the engine and perform the repair completion verification 1.
Repair completion verification 1	VERIFY THAT VEHICLE IS REPAIRED Install/connect the part removed/disconnected during the troubleshooting procedure. Has the malfunction symptom been eliminated?	Yes	Complete the symptom troubleshooting. (Explain contents of repair to customer)
Repair completion verification 1		No	Refer to the controller area network (CAN) malfunction diagnosis flow to inspect for a CAN communication error. (See MALFUNCTION DIAGNOSIS FLOW [CONTROLLER AREA NETWORK (CAN)] .) If the CAN communication is normal, perform the diagnosis from Step 1. If the malfunction recurs, replace the PCM. (Refer to [PCM REMOVAL/INSTALLATION ] in Service Information).