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HOMESERVICE MANUALSKIA2015CADENZA LIMITEDREPAIR AND DIAGNOSISENGINE PERFORMANCETESTING & DIAGNOSISENGINE CONTROL SYSTEM DIAGNOSIS (2 OF 3)DTC P0301: CYLINDER 1-MISFIRE DETECTEDSYSTEM INSPECTION
2015 Kia Cadenza Limited

System Inspection

2015 Kia Cadenza LimitedSECTION System Inspection
  • Misfire Inspection 
    1. Check the cylinder where the misfire occurs after replacing the ignition coil of the cylinder where the misfire has occurred with the ignition coil of the other cylinder.
    2. Does the misfiring cylinder change?

      YES 

      • Repair or replace as necessary. Go to "Verification of Vehicle Repair" procedure

      NO 

      • Go to "Check Air Leakage " as below
  • Ignition coil waveform inspection 
    1. Ignition "ON" and engine "ON".
    2. Measure the voltage between control terminal of ignition soil harness connector and chassis ground.

      Specification : Refer to Figure below

      Fig 1: Display - Engine Idle after Warm Up
      G00570688Courtesy of KIA MOTORS AMERICA, INC.

      Spark retention time - Approx. 1.2ms

      CH. A - Ignition Max 31V

    3. Is the measured waveform within specification?

      YES 

      • Repair as necessary except for the ignition coils and go to "Check Air Leakage" procedure.

      NO 

      • Go to "Check Spark Plug" procedure.
  • Check Spark Plug 
    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?

      YES 

      NO 

      • Go to "CHECK AIR LEAKAGE  " as below.
  • CHECK AIR LEAKAGE 
    1. Visually/physically inspect the air leakage in 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 exhaust manifold and Three way catalyst for air leakage.
    2. Has a problem been found in any of the above areas?

      YES 

      NO 

      • Go to "CHECK FOR AIR LEAKAGE IN POSITIVE CRANKCASE VENTILATION VALVE (PCV)  " below.
  • Check For Air Leakage In Positive Crankcase Ventilation Valve (PCV) 
    1. Remove PCV valve from cylinder head cover by pulling 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 port "A" and verify that air comes out of port "B".
    6. Blow through valve from port "B" and verify that no air comes out of port "A".
    7. Has a problem been found in any of the above areas?

      YES 

      NO 

      • Go to "CHECK COMPRESSION PRESSURE  " as below.
  • 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 plug hole.
    5. Crank the engine with throttle valve wide open and check compression pressure at each cylinder.

      Specification:  1, 029 kPa (10.5 kgf/cm2 , 149 psi) (250~400 RPM)

    6. Is compression pressure for each cylinder displayed within specifications?

      YES 

      • Go to "CHECK TIMING  " as below.

      NO 

      • 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 head gasket. Repair as necessary. Go to "VERIFICATION OF VEHICLE REPAIR " procedure.
  • CHECK TIMING 
    1. IG "OFF"
    2. Monitor these signal waveforms from CAM and Crankshaft position Sensor are correctly aligned.

      Reference: The 17th CKP signal after the missing tooth is aligned with the high voltage CMP signal.

      Fig 2: Display - CMPS Signal Waveform Screen
      G09754846Courtesy of KIA MOTORS AMERICA, INC.
RENDER: 1.0x

NO RELATED

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When to See a Mechanic

Stop DIY work and contact a certified mechanic immediately if any of the following apply:

  • • You smell fuel, burning insulation, or see smoke.
  • • Brakes feel soft, pull hard to one side, or make grinding noises.
  • • The engine overheats, stalls repeatedly, or misfires under load.
  • • You are missing required tools, torque specs, or safe lifting equipment.
  • • You are not confident in the next step or safety outcome.