Hyundai Santa Fe (2006 year). Manual — part 571
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FUEL SYSTEM
DTC P0300 RANDOM/MULTIPLE CYLINDER MISFIRE DETECTED
DTC P0301 CYLINDER 1-MISFIRE DETECTED
DTC P0302 CYLINDER 2-MISFIRE DETECTED
DTC P0303 CYLINDER 3-MISFIRE DETECTED
DTC P0304 CYLINDER 4-MISFIRE DETECTED
DTC P0305 CYLINDER 5-MISFIRE DETECTED
DTC P0306 CYLINDER 6-MISFIRE DETECTED
COMPONENT LOCATION
E595915F
Injector [Bank 2]
Ignition Coil [Bank 2]
LGLG512A
GENERAL DESCRIPTION
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The Misfire monitor diagnostic is based on crankshaft rotation velocity variation. The ECM determines crankshaft rota-
tional velocity using the crankshaft position sensor and camshaft position sensor. When a cylinder misfires the crankshaft
slows down momentarily. By monitoring the crankshaft and camshaft position sensor signals, the ECM can calculate
when a misfire occurs. For a non-catalyst damaging misfire, the diagnostic will be required to report a misfire present
within 1000-3200 engine revolutions. For catalyst damaging misfire, the diagnostic will respond to monitor 200 engine
revolutions. Rough roads may cause false misfire detection. The rough road(acceleration)sensor consists of a piezoelec-
tric vibration pick up which detects vertical acceleration of the vehicle. The sensor signal is used by the ECM to determine
the degree of vertical movement of the car, for example, on a bumpy road. Since this may also cause uneven engine
running, the ECM uses the signal to distinguish the phenomenon from actual misfiring.
DTC DESCRIPTION
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The PCM measures reference event times and calculates the positive and negative acceleration of the crank wheel to
detrmine whether a misfire has occurred.
When the rate of misfire exceeds a threshold where the catalyst reaches a temperature where permanent damage can
ocur. PCM sets this DTC. In case that misfire affects Catalyst damage, MIL(Malfunction Indication Lamp) will be illumi-
nating and blinking at 1HZ frequency. However, In case of Indivisual and Emission damaging misfire, MIL will be turned
on when the malfunction is detected.
Especially, if injector connector is disconnected for more than 46 sec., PCM sets DTC relating to misfire and conducts the
fuel-cut to protect the catalyst.
DTC TROUBLESHOOTING PROCEDURES
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DTC DETECTING CONDITION
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Item
Detecting Condition
Possible Cause
DTC Strategy
• Determine if a multiple cylinder misfire or a
cylinder specific misfire is occurring by monitoring
crankshaft acceleration.
Enable condition
• No sudden change in throttle opening
• Torque management control is not functioning
• Not deceleration fuel cut off
• Not fuel cut off during high speed operation
• Not negative torque driving conditions
• Not fuel level low
• TEC is learned
• Coolant temperature is outside the window
• 500〈 Engine speed〈 6600
• 11〈 Battery vlotage〈 16
• TPS/MAP sensor/CAMS/CKPS/ECT sensor
are normal
Case 1
• Individual event misfire detection 〉 Threshold
Case 2
• Emissions damaging 〉Threshold
Thresh
old value
Case 3
• Catalyst damaging 〉 Threshold
Diagnosis time
• Continuous
MIL ON condition
• 2 driving cycles
• 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
MONITOR DTC STATUS
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1.
Check DTC Status
1)
Connect scantool to Data Link Connector(DLC).
2)
IG "ON".
3)
Select "Diagnostic Trouble Codes(DTCs)" mode, and then Press F4(DTAL) to check DTC’s information from the
DTCs menu
4)
Read "DTC Status" parameter.
SCMF16159L
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FUEL SYSTEM
5)
Is parameter displayed "Present fault"?
YES
▶ Go to "System Inspection" procedure.
NO
▶ Fault is intermittent caused by poor contact in the sensor’s and/or PCM’s connector or was repaired and PCM
memory was not cleared. Thoroughly check connectors for looseness, poor connection, ending, corrosion, con-
tamination, deterioration, or damage. Repair or replace as necessary and go to "Verification of Vehicle Repair"
procedure.
SYSTEM INSPECTION
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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?
YES
▶ Repair or replace as necessary and go to "Verification of Vehicle Repair" procedure
NO
▶ Go to "Check Air Leakage " as below
2.
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 HO2S and Three way catalyst for air leakage
2)
Has a problem been found in any of the above areas?
YES
▶ Repair or replace as necessary and go to "Verification of Vehicle Repair" procedure
NO
▶ 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
DTC TROUBLESHOOTING PROCEDURES
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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 ?
YES
▶ Repair or replace as necessary and go to "Verification of Vehicle Repair" procedure
NO
▶ Go to "Check Compression pressure" as 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
6)
Is compression pressure for each cylinder displayed within specifications ?
Specification : 1323kPa(13.5 kg/cm²,192 psi)
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 gasket. Repair as necessary and go to "Verification of Vehicle Repair" procedure
5.
Check Timing
1)
Ignition "OFF"
2)
Check that Cam, Crank and Oil pump sprocket timing marks are correctly in alignment
3)
Monitor these signal waveforms from CMPS and CKPS position Sensor are correctly in alignment
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