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DTC P0300: RANDOM MISFIRE DETECTED & P0301-P0306 CYLINDER NO. 1-6 MISFIRE DETECTED
Testing individual components does not isolate shorts or opens. Perform all voltage tests using a Digital Volt-Ohmmeter Meter (DVOM) with a minimum 10-megohm input impedance, unless stated otherwise in test procedure. Use ohmmeter to isolate wiring harness shorts or opens.
Malfunction code will set if misfire has occurred more frequently than allowed during last 200 revolutions, when catalyst temperature is higher than 1742 F (950 C). Also when misfire has occurred more frequently than allowed number of times (2%) during 1000 engine revolutions.
Check for following possible problems:
" Vacuum leak in air intake system.
" Faulty Crankshaft Position (CKP) sensor or circuit.
" Faulty ignition circuit.
" Faulty ignition coil or plug wire.
" Faulty spark plug.
" Low engine compression.
" Low or high fuel pressure.
" Faulty fuel injector or circuit.
1. Turn ignition off. Connect Hi-Scan Pro/Kia Data Pro Scan tool or equivalent to OBD-II Data Link Connector. Turn ignition on. Monitor for other DTCs. If DTCs related to Heated Oxygen Sensor (HO2S), Engine Coolant Temperature (ECT) sensor or Mass Air Flow (MAF) sensor are set, do all repairs associated with those DTCs before continuing with this procedure. If no other DTCs are set, go to next step.
2. Turn ignition off. Check Positive Crankcase Ventilation (PCV) valve operation. Also check vacuum hoses for splits and proper connections to engine dynamic chamber (specially PCV, Idle Air Control (IAC), throttle body, intake manifold and brake booster). If PCV valve operation, vacuum hoses and hoses connection are okay, go to next step. If PCV valve and vacuum hoses are found split, damage or misconducted, repair or replace as necessary and
go to step 10.
3. Disconnect suspected ignition coil 3-pin harness connector.
Turn ignition on. Measure voltage between ground and suspected ignition coil connector terminal No. 3 (Red wire). Voltage should be battery voltage. If voltage is as specified, go to next step. If voltage
is not as specified, repair open circuit between ignition switch and suspected ignition coil connector terminal No. 3 (Red wire). After repair, go to step 10 .
4. Check ignition coils and spark plug wires for cracks or carbon tracing. Check suspected ignition coil primary resistance, resistance should be approximately 0.80 ohms at 68 F (20 C). Check suspected ignition coil secondary resistance, resistance should be approximately 13,000 ohms at 68 F (20 C). Also check for spark plug wires resistance, resistance should be 16,000 ohms per 3.3 feet. If ignition coil and spark plug wires are as specified, go to next step. If ignition coil and/or spark plug wires are not as specified, repair or replace as
necessary and go to step 10.
5. Return vehicle to original condition. Release fuel pressure from fuel system. Install fuel pressure gauge at fuel rail. Fuel pressure should be 46-49 psi (320-340 kPa) at idle. If fuel pressure is as specified, go to step 8. If fuel pressure is too high, go to next step. If fuel pressure is too low, go to step 7.
6. Turn ignition off. Release fuel pressure from fuel system. Disconnect fuel return line hose from fuel rail and blow through line towards fuel tank. If fuel return line is restricted, repair or replace as necessary and go to step 10. If fuel return line is okay, replace fuel pressure regulator and go to step 10.
7. Start engine. Allow engine to idle and clamp fuel delivery line before fuel rail and check for fuel pressure to rises. If fuel pressure rises, replace fuel pump and go to step 10. If fuel pressure does not rises, check on-line fuel filter and fuel pump pick-up screen for restriction. If filters are okay replace fuel pump and go to step 10. If fuel filters are faulty, repair or replace as necessary, and go to step 10.
8. Turn ignition off. Remove spark plugs. Check condition and gap of spark plugs. Spark plug gap should be .039-.043" (1.0-1.1 mm). If spark plugs are as specified, go to next step. If spark plugs are not as specified, adjust or replace spark plugs as necessary and go to step 10.
9. Perform engine compression test. Compression should be about 170 psi (1200 kPa) at cranking speed with no more than 10 percent variation between highest and lowest cylinders. If engine compression is as specified, go to next step. If engine compression is not as specified, perform leak down test to determine source of low compression. Repair as necessary and go to next step.
10. After repair, return vehicle to original condition. Clear codes using Hi-Scan Pro/Kia Data Pro Scan tool or equivalent. Verify repairs by driving vehicle and monitoring for pending codes. If DTC is set during test drive, follow appropriate DTC test procedure.
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SELF-DIAGNOSTICS -2002 Kia Sedona EX
Thursday, March 4th, 2010 AT 11:26 AM