Diagnostic Procedure

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CRANKS NORMALLY BUT WILL NOT START (PYUL) DIAGNOSTIC PROCEDURE

Step	Inspection	Results	Action
1	INSPECT VEHICLE CONDITION FOR EFFECT ON MALFUNCTION Verify how the customer drives the vehicle by asking the customer the following: Because engine is started with accelerator pedal fully depressed, it goes into dechoke mode and fuel is not injected Does the engine start with the accelerator pedal fully depressed?	Yes	Explain to the customer that the vehicle is normal and give them advice on how to start the engine and a specific example of the conditions in which the engine goes into dechoke mode.
1		No	Go to the next step.
2	DETERMINE IF MALFUNCTION CAUSE IS OVERHEATING OR OTHER 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.
2		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] ).
3	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)] .)
3		No	Go to the next step.
4	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 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.
4		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). 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 .)
5	DETERMINE IF MALFUNCTION CAUSE IS DRIVE-BY-WIRE CONTROL SYSTEM OR OTHER Will the engine run smoothly at part throttle?	Yes	Go to Step 7.
5		No	Go to the next step.
6	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.
6		No	Repair or replace the malfunctioning location and perform the repair completion verification 1.
7	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.
7		No	Repair or replace the malfunctioning location and perform the repair completion verification 1.
8	VERIFY IF MALFUNCTION CAUSE IS MAF SENSOR SIGNAL NOTE: If the inspection in Step 8 is performed, the PCM detects a DTC and performs fail-safe control. After performing the inspection, clear DTCs using the M-MDS. Switch the ignition off. Disconnect the MAF sensor/IAT sensor No. 1 connector. Start the engine. Does the engine start normally?	Yes	Clean the MAF sensor. Has the malfunction symptom been eliminated? If the symptom remains, inspect the MAF sensor related wiring harness and connector. 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 MAF sensor/IAT sensor No. 1 and perform the repair completion verification 1. (Refer to [MASS AIR FLOW (MAF) SENSOR/INTAKE AIR TEMPERATURE (IAT) SENSOR NO. 1 REMOVAL/INSTALLATION ] in Service Information).
8		No	Go to the next step.
9	VERIFY RELAY FOR MALFUNCTION Inspect the applicable part. (Refer to [RELAY INSPECTION ] in Service Information). Is the part normal?	Yes	Go to the next step.
9		No	Repair or replace the malfunctioning location and perform the repair completion verification 1. (Refer to [RELAY LOCATION ] in Service Information).
10	VERIFY FUSE FOR MALFUNCTION Inspect the applicable part. Is the part normal?	Yes	Reinstall the fuse, then go to the next step.
10		No	If the fuse is blown: Replace the fuse, then go to the next step. If the fuse is damaged: Replace the fuse and perform the repair completion verification 1.
11	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.
11		No	Repair or replace the malfunctioning location and perform the repair completion verification 1.
12	INSPECT WIRING HARNESS (INCLUDING CONNECTOR/TERMINAL) BETWEEN BATTERY AND SUB RELAY FOR MALFUNCTION Inspect the applicable circuit. (See CIRCUIT INSPECTION .) (See CONNECTOR INSPECTION .) Is the circuit normal?	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 BATTERY AND IG1 RELAY 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 WIRING HARNESS (INCLUDING CONNECTOR/TERMINAL) BETWEEN BATTERY AND FUEL PUMP RELAY FOR MALFUNCTION Inspect the applicable circuit. (See CIRCUIT INSPECTION .) (See CONNECTOR INSPECTION .) Is the circuit normal?	Yes	Go to the next step.
14		No	Repair or replace the malfunctioning location and perform the repair completion verification 1.
15	INSPECT WIRING HARNESS (INCLUDING CONNECTOR/TERMINAL) BETWEEN SUB RELAY AND BODY GROUND FOR MALFUNCTION Inspect the applicable circuit. (See CIRCUIT INSPECTION .) (See CONNECTOR INSPECTION .) Is the circuit normal?	Yes	Go to the next step.
15		No	Repair or replace the malfunctioning location and perform the repair completion verification 1.
16	INSPECT WIRING HARNESS (INCLUDING CONNECTOR/TERMINAL) BETWEEN IG1 RELAY AND BODY GROUND FOR MALFUNCTION Inspect the applicable circuit. (See CIRCUIT INSPECTION .) (See CONNECTOR INSPECTION .) Is the circuit normal?	Yes	Go to the next step.
16		No	Repair or replace the malfunctioning location and perform the repair completion verification 1.
17	INSPECT WIRING HARNESS (INCLUDING CONNECTOR/TERMINAL) BETWEEN MAIN RELAY AND SUB RELAY FOR MALFUNCTION Inspect the applicable circuit. (See CIRCUIT INSPECTION .) (See CONNECTOR INSPECTION .) Is the circuit normal?	Yes	Go to the next step.
17		No	Repair or replace the malfunctioning location and perform the repair completion verification 1.
18	INSPECT WIRING HARNESS (INCLUDING CONNECTOR/TERMINAL) BETWEEN IG1 RELAY AND FUEL PUMP RELAY FOR MALFUNCTION Inspect the applicable circuit. (See CIRCUIT INSPECTION .) (See CONNECTOR INSPECTION .) Is the circuit normal?	Yes	Go to the next step.
18		No	Repair or replace the malfunctioning location and perform the repair completion verification 1.
19	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.
19		No	Repair or replace the malfunctioning location and perform the repair completion verification 1.
20	INSPECT WIRING HARNESS (INCLUDING CONNECTOR/TERMINAL) BETWEEN FUEL PUMP 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.
20		No	Repair or replace the malfunctioning location and perform the repair completion verification 1.
21	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 Poor connection for PCM ground and body ground Fuses Fuel leakage Vacuum leakage CKP 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 (exhaust camshaft) Is there any malfunction?	Yes	Repair or replace the malfunctioning location and perform the repair completion verification 1.
21		No	Go to the next step.
22	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 28.
22		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 the next step. Higher than specification: Go to the next step.
23	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).
23		No	Repair or replace the malfunctioning location and perform the repair completion verification 1.
24	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.
24		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).
25	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.
25		No	Repair or replace the malfunctioning location and perform the repair completion verification 1.
26	INSPECT FUEL TANK Inspect the fuel tank. (Refer to [FUEL TANK INSPECTION ] in Service Information). Is vapor occurring?	Yes	Replace the fuel tank and perform the repair completion verification 1. (Refer to [FUEL TANK REMOVAL/INSTALLATION ] in Service Information).
26		No	Go to the next step.
27	INSPECT HIGH PRESSURE FUEL PUMP Inspect the high pressure fuel pump. (Refer to [HIGH PRESSURE FUEL PUMP INSPECTION ] in Service Information). Is vapor occurring?	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).
27		No	Go to the next step.
28	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 34.
28		No	Go to the next step.
29	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.
29		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).
30	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.
30		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).
31	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.
31		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).
32	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.
32		No	Go to the next step.
33	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.
33		No	Adjust the valve timing to the correct timing and perform the repair completion verification 1.
34	INSPECT IGNITION SYSTEM OPERATION NOTE: Because the malfunction may have been resolved by removing the carbon adhered to the spark plug during the spark inspection for the spark plug, verify that the repairs have been completed. 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.
34		No	Repair or replace the malfunctioning location and perform the repair completion verification 1.
35	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.
35		No	Go to the next step.
36	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).
36		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).