Diagnostic Procedure

STEP	INSPECTION		ACTION
1	VERIFY FREEZE FRAME DATA (MODE 2)/SNAPSHOT DATA AND DIAGNOSTIC MONITORING TEST RESULTS HAVE BEEN RECORDED Have the FREEZE FRAME DATA (Mode 2)/snapshot data and DIAGNOSTIC MONITORING TEST RESULTS (misfire related) been recorded?	Yes	Go to the next step.
1		No	Record the FREEZE FRAME DATA (Mode 2)/snapshot data and DIAGNOSTIC MONITORING TEST RESULTS on the repair order, then go to the next step.
2	VERIFY RELATED REPAIR INFORMATION AVAILABILITY Verify related Service Bulletins and/or on-line repair information availability. Is any related repair information available?	Yes	Perform repair or diagnosis according to the available repair information. If the vehicle is not repaired, go to the next step.
2		No	Go to the next step.
3	VERIFY RELATED PENDING CODE AND/OR DTC Switch the ignition to off, then to ON (engine off). Perform the Pending Trouble Code Access Procedure and DTC Reading Procedure. (See ON-BOARD DIAGNOSTIC TEST .) Are any other PENDING CODEs and/or DTCs present?	Yes	Go to the applicable PENDING CODE or DTC inspection. (See DTC TABLE .)
3		No	Go to the next step.
4	VERIFY CURRENT INPUT SIGNAL STATUS (KEY TO ON/IDLE) Access the following PIDs using the M-MDS: (See ON-BOARD DIAGNOSTIC TEST .) APP1 APP2 ECT IAT MAF RPM TP REL VSS Is there any signal that is far out of specification when the ignition is switched to ON and the engine idles? (See PCM INSPECTION .)	Yes	Inspect the suspected sensor and related wiring harness. Repair or replace the malfunctioning part according to the inspection results, then go to Step 22.
4		No	Go to the next step.
5	VERIFY CURRENT INPUT SIGNAL STATUS UNDER FREEZE FRAME DATA (MODE 2) CONDITION 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. Access the same PIDs as in Step 4 while simulating under the FREEZE FRAME DATA (Mode 2) conditions. (See ON-BOARD DIAGNOSTIC TEST .) Is there any signal which causes drastic changes?	Yes	Inspect the suspected sensor and related wiring harness. Repair or replace the malfunctioning part according to the inspection results, then go to Step 22.
5		No	Go to the next step.
6	INSPECT CMP SENSOR Inspect the CMP sensor. (See CAMSHAFT POSITION (CMP) SENSOR INSPECTION .) Is there any malfunction?	Yes	Inspect the installation condition for damage to the timing chain and gears. If there is any malfunction: Repair or replace the malfunctioning part according to the inspection results. If there is no malfunction: Replace the CMP sensor. (See CAMSHAFT POSITION (CMP) SENSOR REMOVAL/INSTALLATION .) Go to Step 22.
6		No	Go to the next step.
7	INSPECT INSTALLATION OF CKP SENSOR Inspect installation of CKP sensor. Is the CKP sensor installed securely?	Yes	Go to the next step.
7		No	Retighten the CKP sensor, then go to Step 22. (See CRANKSHAFT POSITION (CKP) SENSOR REMOVAL/INSTALLATION .)
8	INSPECT IGNITION SYSTEM OPERATION Perform the Spark Test. (See ENGINE CONTROL SYSTEM OPERATION INSPECTION .) Is a strong blue spark visible at each cylinder?	Yes	Go to Step 11.
8		No	Go to the next step.
9	INSPECT SPARK PLUG Inspect the spark plugs for all cylinders. (See SPARK PLUG INSPECTION .) Is there any malfunction?	Yes	Replace the suspected spark plug, then go to Step 22. (See SPARK PLUG REMOVAL/INSTALLATION .)
9		No	Go to the next step.
10	INSPECT IGNITION COIL Inspect the ignition coils for all cylinders. (See IGNITION COIL INSPECTION .) Is there any malfunction?	Yes	Replace the suspected ignition coil, then go to Step 22. (See IGNITION COIL REMOVAL/INSTALLATION .)
10		No	Inspect the ignition coil related wiring harness condition (intermittent open or short) for all cylinders. Repair or replace the suspected wiring harness, then go to Step 22.
11	VERIFY CURRENT INPUT SIGNAL STATUS OF MAF SENSOR Start the engine. Access the MAF PID using the M-MDS. (See ON-BOARD DIAGNOSTIC TEST .) Verify that the MAF PID value changes quickly while increasing (racing) the engine rpm. Is the MAF PID response normal? (See PCM INSPECTION .)	Yes	Go to Step 13.
11		No	Go to the next step.
12	INSPECT INTAKE AIR SYSTEM FOR AIR SUCTION Inspect for air leakage between the following: MAF sensor and throttle body Throttle body and intake manifold NOTE: Engine speed may change when rust penetrating agent is sprayed on the air suction area. Is there any malfunction?	Yes	Repair or replace the malfunctioning part according to the inspection results, then go to Step 22.
12		No	Replace the MAF/IAT sensor, then go to Step 22. (See INTAKE-AIR SYSTEM REMOVAL/INSTALLATION .)
13	INSPECT FUEL LINE PRESSURE NOTE: If the engine will not start, inspect the fuel line pressure with ignition switches to ON. Inspect the fuel line pressure with the engine is running. (See FUEL LINE PRESSURE INSPECTION .) Is there any malfunction?	Yes	If the fuel line pressure is too low: Go to the next step. If the fuel line pressure is too high: Replace the fuel pump unit, then go to Step 22. (See FUEL PUMP UNIT REMOVAL/INSTALLATION .)
13		No	Go to Step 16.
14	INSPECT FOR FUEL LINE LEAKAGE Visually inspect for leakage from fuel line between fuel injector and fuel pump unit. Is there any leakage?	Yes	Repair or replace the malfunctioning part according to the inspection results, then go to Step 22.
14		No	Go to the next step.
15	INSPECT FUEL FILTER Visually inspect for foreign materials or stain inside fuel filter (low-pressure side). Is there any foreign materials or stain?	Yes	Clean the fuel tank and filter (low-pressure side), then go to Step 22.
15		No	Replace the fuel pump unit, then go to Step 22. (See FUEL PUMP UNIT REMOVAL/INSTALLATION .)
16	INSPECT VARIABLE VALVE TIMING CONTROL SYSTEM OPERATION Perform the Variable Valve Timing Control System Operation Inspection. (See ENGINE CONTROL SYSTEM OPERATION INSPECTION .) Is there any malfunction?	Yes	Repair or replace the malfunctioning part according to the inspection results, then go to Step 22.
16		No	Go to the next step.
17	INSPECT PURGE SOLENOID VALVE OPERATION Switch the ignition to off. Connect the vacuum pump to the purge solenoid valve and apply vacuum to the solenoid. Verify that the solenoid holds vacuum. Switch the ignition to ON (engine off). Access the EVAPCP PID of simulation item using the M-MDS. (See ON-BOARD DIAGNOSTIC TEST .) Set the purge solenoid value to 100 % for the EVAPCP PID. Verify that the purge solenoid value releases vacuum while the 100 % for the EVAPCP PID. Is the purge solenoid valve operation normal?	Yes	Go to the next step.
17		No	Replace the purge solenoid valve, then go to Step 22. (See PURGE SOLENOID VALVE REMOVAL/INSTALLATION .)
18	INSPECT ENGINE COMPRESSION Inspect the engine compression. (See COMPRESSION INSPECTION .) Is there any malfunction?	Yes	Repair or replace the malfunctioning part according to the inspection results, then go to Step 22.
18		No	Go to the next step.
19	INSPECT SEALING OF ENGINE COOLANT PASSAGE Perform the "ENGINE COOLANT LEAKAGE INSPECTION". (See ENGINE COOLANT LEAKAGE INSPECTION .) Does the radiator cap tester needle drop even though there is no engine coolant leakage from the radiator or the hoses?	Yes	Engine coolant leakage from the engine (between the combustion chamber and the engine coolant passage) may have occurred. Verify the conditions of the gasket and the cylinder head. If there is any malfunction: Repair or replace the malfunctioning part according to the inspection results, then go to Step 22.
19		No	Go to the next step.
20	INSPECT EGR VALVE Inspect the EGR valve. (See EGR VALVE INSPECTION .) Is there any malfunction?	Yes	Replace the EGR valve, then go to Step 22. (See EGR VALVE REMOVAL/INSTALLATION .)
20		No	Go to the next step.
21	INSPECT PCV VALVE OPERATION Switch the ignition to off. Remove the PCV valve. (See POSITIVE CRANKCASE VENTILATION (PCV) VALVE REMOVAL/INSTALLATION .) Inspect the PCV valve. (See POSITIVE CRANKCASE VENTILATION (PCV) VALVE INSPECTION .) Is there any malfunction?	Yes	Replace the PCV valve, then go to the next step. (See POSITIVE CRANKCASE VENTILATION (PCV) VALVE REMOVAL/INSTALLATION .)
21		No	Poor quality fuel is used. Replace the fuel, then go to the next step.
22	VERIFY DTC TROUBLESHOOTING COMPLETED Make sure to reconnect all disconnected connectors. Clear the DTC from the PCM memory using the M-MDS. (See AFTER REPAIR PROCEDURE .) Perform the KOER self test. (See KOEO/KOER SELF TEST .) Is the PENDING CODE for this DTC present?	Yes	Repeat the inspection from Step 1. If the malfunction recurs, replace the PCM. (See PCM REMOVAL/INSTALLATION .) Go to the next step.
22		No	Go to the next step.
23	VERIFY AFTER REPAIR PROCEDURE Perform the "AFTER REPAIR PROCEDURE". (See AFTER REPAIR PROCEDURE .) Are any DTCs present?	Yes	Go to the applicable DTC inspection. (See DTC TABLE .)
23		No	DTC troubleshooting completed.