Component Location

General Description

DTC Description

DTC Detecting Condition

Item		Detecting Condition	Possible Cause
DTC strategy		• Determine ir a muliple cylinder misfire or a cylinder specific misfire is occurring by monitoring crnckshaft acceleration	• Faulty Spark plugs • Faulty Spark plug cables • Air Leakage • Belt deflection and Air gap of CKPS • Incorrect timing • Faulty injector • Improper fuel pressure • Improper engine compression • Faulty PCM
Enable condition		No disabling faults present / No disabiling Active Faults • P0340 / P0341 / P0118 / P0117 / P0115 / P0336 / P0335 / P1295 P0103 / P0102 / 0108 / P0107 / P0106 / P0501 • Engine speed between 550 and 5800 RPM • System voltage between 9 and 18 volts • The ECT indicates an engine temperature between -6°C(20°F) and 120°C(248°F)
Threshold Value	Case 1	• Individual cylinder misfire detection
	Case 2	• Emissions damaging - 18 times in 600 ignitions (In case that the misfire affects more than 1.5 times than FTP emissins)
	Case 3	• Catalyst damaging - 95 times in 600 ignitions at idle ( It is going to be changeable according to the load or the temperature which is not in the range where it does not melt catalyst)
Diagnosis time		• Continuous
MIL ON condition		• 2 driving cycles

Monitor DTC Status

1.

Check DTC Status (1) Connect scantool to Data Link Connector(DLC). (2) IG "ON". (3) Select "DTC" button, and then Press "DTC Status" to check DTC's information from the DTCs menu. (4) Read "DTC Status" parameter. (5) Is parameter displayed "Present fault"? ▶ Go to "System Inspection" procedure. ▶ Although the misfire does not occur when the vehicle is brought to workshop, misfire can be reproduced when the condition is met. Drive the vehicle according to the freeze frame data in order to satisfy the condition.

System Inspection

1.

Check Spark Pulg (1) Remove cylinder's spark plugs (2) Visually/physically inspect the following items: - Damaged insulation, Worn electrodes, Oil or fuel fouled, Loose terminals and cracks - Check for plug gap : 1.0 - 1.1 mm (0.039 - 0.043 in.) - Check if the spark plug for the relevant cylinder is lighter in color than the other plugs. (3) Has a problem been found in any of the above areas? ▶ Repair or replace as necessary and go to "Verification of Vehicle Repair" procedure ▶ Go to "Check Air Leakage " as indicated below

2.

Check Air Leakage (1) Visually/physically inspect the intake/exhaust system as following items, - Vacuum hoses for splits, kinks and improper connections. - Throttle body gasket - Gasket between intake manifold and cylinder head - Seals between intake manifold and fuel injectors - Exhaust system between HO2S and Three way catalyst for air leakage (2) Has a problem been found in any of the above areas? ▶ Repair or replace as necessary and go to "Verification of Vehicle Repair" procedure ▶ Go to "Check for air leakage in Positive Crankcase Ventilation Valve(PCV)

3.

Check for air leakage in Positive Crankcase Ventilation Valve(PCV) (1) Remove PCV valve from cylinder head cover by puling ventilation hose (2) With engine idling block PCV valve opening (3) Verify that vacuum is felt (4) Remove PCV valve (5) Blow through valve from prot "A" and verify that air comes out of prot "B" (6) Blow through valve from prot "B" and verifty that no air comes out of port "A" (7) Has a problem been found ? ▶ Repair or replace as necessary and go to "Verification of Vehicle Repair" procedure ▶ Go to "Check Compression pressure" as indicated below

4.

Check Compression pressure (1) Warm up the engine to normal operating temperature (2) Disconnect the spark plug cables and remove the spark plugs. (3) Crank the engine to remove any foreign material in the cylinders. (4) Put compression pressure gauge into spark pulg hole (5) Crank the engine with widely opend throttle valve and check compression pressure at each cylinder Specification : 1323kPa(13.5 kg/cm²,192 psi) (6) Is compression pressure for each cylinder displayed within specifications ? ▶ Go to "Check Timing " as indicated below ▶ Add a small amount of oil through the spark plug hole, and repeat above steps. If the addition of oil causes the compression to rise, the cause is a worn or damaged piston ring or cylinder inner surface. ▶ If the compression remains the same, the cause is a burnt or defective valve seat, or pressure is leaking from the gasket. Repair as necessary and go to "Verification of Vehicle Repair" procedure

5.

Check Timing (1) Ignition "OFF" (2) Monitor these signal waveforms from CAM and Crank shaft position Sensor are correctly aligned. Reference : The 17th of CKP signal from missing tooth is aligned with high of CMP signal (3) Are all timing marks alligned correctly ? ▶ Go to "Check Fuel Pressure" as indicated below ▶ Check that Cam, Crank and Oil pump sprocket timing marks are correctly aligned. Repair or readjust as necessary and go to "Verification of Vehicle Repair" procedure

6.

Check Fuel Pressure 1. Be cautious that Fuel is explosive and an empty fuel tank can still contain explosive gases. When working on fuel system make sure to supply adequate ventilation to the work area. Do not smoke, and keep sparks and open flames away. 2. The fuel system remains under pressure when the engine is not running. Release fuel system pressure before disconnecting any fuel line to reduce the chance of presonal injury or fire damage to vehicle components. (1) IG "OFF" and disconnect Fuel Pump Relay in Junction Box. (2) Start-up and wait until it stops itself. (3) IG "OFF" and connect Fuel Pump Relay. (4) Install the fuel pressure gauge to the delivery pipe with the fuel pressure gauge adaptor. (5) Activate the fuel pump, and with fuel pressure applied, check that there is no fuel leakage from the pressure gauge or connection part. (6) Measure the fuel pressure at idle. Specification : 374.6 ~ 384.4 kPa(3.82 ~ 3.92 kg/cm², 54.3 ~ 55.8 psi) (7) Is the measured fuel pressure within specifications ? ▶ Substitute with a known - good PCM and check for proper operation. If the problem is corrected, replace PCM and go to "Verification of Vehicle Repair" procedure. ▶ Repair or replace according to the below table. And then, go to " Verification of Vehicle Repair"procedure. Condition Possible Cause Fuel Pressure is too low Fuel filter,fuel pressure regulator, in-tank fuel hose or the fuel pump Fuel Pressure is too high Fuel pressure regulator, hose or pipe

Verification Of Vehicle Repair

1.	Connect scantool and select "DTC" button.

2.	Press "DTC Status" button and confirm that "DTC Readiness Flag" indicates "Completed". If not, drive the vehicle within conditions noted in the freeze frame data or enable conditions

3.	Read "DTC Status" parameter

4.	Is parameter displayed "History(Not Present) fault"? ▶ System performing to specification at this time. Clear the DTC ▶ Go to the applicable troubleshooting procedure.