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 14.
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 14.
5		No	Go to the next step.
6	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 9.
6		No	Go to the next step.
7	INSPECT SPARK PLUG CONDITION Remove the spark plug for suspected cylinder. (See SPARK PLUG REMOVAL/INSTALLATION .) Inspect the spark plug for suspected cylinder. (See SPARK PLUG INSPECTION .) Is there any malfunction?	Yes	Replace the suspected spark plug, then go to Step 14. (See SPARK PLUG REMOVAL/INSTALLATION .)
7		No	Go to the next step.
8	INSPECT IGNITION COIL Inspect the ignition coil for suspected cylinder. (See IGNITION COIL INSPECTION .) Is there any malfunction?	Yes	Replace the suspected ignition coil, then go to Step 14. (See IGNITION COIL REMOVAL/INSTALLATION .)
8		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 14.
9	INSPECT INTAKE AIR SYSTEM FOR AIR SUCTION Inspect for air leakage at the following: Around connection of dynamic chamber and intake manifold Around connection of intake manifold and cylinder head 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 14.
9		No	Go to the next step.
10	INSPECT FUEL INJECTOR RELATED WIRING HARNESS Remove the intake air system parts. (See INTAKE-AIR SYSTEM REMOVAL/INSTALLATION .) Disconnect the fuel injector connector on suspected cylinder. Connect the test light to the fuel injector terminals. Inspect the test light during cranking. Does the test light illuminate?	Yes	Go to the next step.
10		No	Inspect the fuel injector wiring harnesses. Repair or replace the suspected wiring harness, if necessary. Go to Step 14.
11	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 14.
11		No	Go to the next step.
12	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 14.
12		No	Go to the next step.
13	INSPECT FUEL INJECTOR OPERATION Remove the fuel injector from the suspected cylinder. (See FUEL INJECTOR REMOVAL/INSTALLATION .) Switch the injector with the injector on other cylinder. Clear the DTC from the PCM memory using the M-MDS. (See AFTER REPAIR PROCEDURE .) Start the engine and idle it. Perform the KOER self test. (See KOEO/KOER SELF TEST .) Is the misfire DTC for cylinder which has a suspected fuel injector?	Yes	Replace the suspected fuel injector, then go to the next step. (See FUEL INJECTOR REMOVAL/INSTALLATION .)
13		No	Go to the next step.
14	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.
14		No	Go to the next step.
15	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 .)
15		No	DTC troubleshooting completed.