FLA -350
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
E8981F68
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
E8D0ED27
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.