CS35 2013.04
3.1.13-171 3.1.13-171Electronic Control System - ME7
DTC P0300, P0301, P0302, P0303, P0304
1. DTC Description
2. Possible Sources
Fault Code Description Definition
P0300 Multi - cylinder misfire ECM monitors the interval of CKP sensor input sig-
nal. ECM calculates the interval change for each cyl-
inder. If the interval change exceeds the pre-
programmed standard, then the ECM will detect the
corresponding bad ignition cylinder. When the
engine is running, ECM count the ignition misfire fre-
quency when the revolutions of the crankshaft is 200
rpm and 1,000 rpm, and the calculate the misfire
rate for crankshaft rotates one circle. If the misfire
rate exceeds the pre - programmed standard, then
the ECM will determine the occurrence of bad igni-
tion that a catalytic converter can be damaged or
can adversely affect emission performance.
P0301 Cylinder 1 misfire
P0302 Cylinder 2 misfire
P0303 Cylinder 3 misfire
P0304 Cylinder 4 misfire
Fault
Code
Test Tactics
Setting Conditions (Control
Strategy)
Fault
P0300
P0301
P0302
P0303
P0304
The misfire ratio
that damages the
catalyst
• The misfire ratio that damage the cat-
alyst is higher than 6% ~ 23%
• Bad circuit test
• Fuel cut - off
• Torque interfere
• Connector connection loose,
poor contact
• Vacuum hose is broken,
loose
• Ignition system fault
• Fuel system fault
• Intake air pressure sensor
fault
• Engine water temperature
sensor fault
• Cylinder compression pres-
sure fault
• Valve clearance and timing
fault
• Evaporative emission control
system
• Crankshaft forced ventilation
system
• Air Intake system
• Echaust system air vent clog
• ECM control wiring harness
fault
• ECM fault
The misfire ratio
that get the emis-
sion worse
• The misfire ratio that get the emission
worse is bigger than 3.0 %
• Engine speed is higher than 600 rpm,
less than 5,800 rpm
• Engine load
Untrusted fault
• The misfire ratio that get the emission
worse is bigger than 3.0 %.Air intake
temperature is higher than -25 ℃ .
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