DTC P0300: RANDOM MISFIRE DETECTED
DTC Set Criteria
At least 5 seconds have passed since engine started. Engine speed is 500-6000 RPM (2.4L) or 440-6000 RPM (3.0L). Engine coolant temperature is more than 14°F (-10°C). Intake air temperature is more than 14°F (-10°C). Barometric pressure is more than 11 psi (76 kPa). Adaptive learning is complete for the vane which generates crankshaft position signal. Engine is running and there is no gear shifting, deceleration, sudden acceleration or A/C compressor switching occurring. Vehicle speed is 1.6 MPH or more. Throttle deviation is -59-59 millivolts per 10 milliseconds. Misfire is determined by change in angular velocity of Crankshaft Position (CKP) sensor. Code will set if misfire occurred in 4 or more of last 200 revolutions when catalytic converter temperature is more than 1742°F (950°C) (severe misfire which will cause MIL to flash continuously). Also, code will set if misfire occurred in 20 or more of last 1000 revolutions.
Probable Causes
†Ignition system related part(s) failed.
†Poor CKP sensor signal.
†Incorrect air/fuel ratio.
†Low compression pressure.
†Timing belt jumped or teeth broken.
†EGR system failed.
†Engine Control Module/Powertrain Control Module (ECM/PCM) failed.
Item # 32 is the camshaft, located under the valve cover. You have either 2 or 4 camshafts depending on SOHC or DOHC.
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Sunday, December 5th, 2010 AT 4:02 AM
