General Precautions of EFI System Maintenance
F-45
Step I: Use diagnostic instrument to read the malfunction information
Read Result I Read Result II
MIL Lamp On P-CODE Present MIL Lamp Off P-CODE Present
P0300
P0300
Maintenance tips:
The malfunction has been confirmed, and the
following problems may possibly exist
1) Fuel injector needs to be cleaned
2) Air intake passage needs to be cleaned
3) Air leakage with valve
4) Malfunction in ignition system; inspect (and
replace as required) ignition wire, spark plug
5) Serious wear of cylinder
Maintenance tips:
The malfunction has not been finally confirmed.
Please wait for system confirmation.
56. P0301 1
st
-Cylinder Misfire
Description about Malfunction Cause:
Misfire indicates that the engine fails to release effective ignition energy (malfunction of ignition) in the
cylinder due to the ignition system arising from deviation in fuel injection volume (deviation in concentration
of mixed gas), too low cylinder compressed pressure, or any other factors, leading to the interruption or
malfunction of combustion in the burning process inside the cylinder, which will give rise to emission over
standard, or damage of catalytic converter due to over heat. As for OBD diagnostic test, when the frequency
of misfire for the 1
st
cylinder exceeds the set value, the system will determine misfire malfunction of the 1
st
cylinder.
Related Malfunction Symptoms:
1. Idling Jitter
2. Weak Acceleration
3. Increased Fuel Consumption
4. Emission over Standard
Malfunction Diagnostic Guide:
Required Equipment: (Diagnostic Instrument with EOBD Diagnostic Function, Digital Multimeter, and
Correct Circuit Diagram)
Step I: Use diagnostic instrument to read the malfunction information
Read Result I Read Result II
MIL Lamp On P-CODE Present MIL Lamp Off P-CODE Present
P0301
P0301
Maintenance tips:
The malfunction has been confirmed, and the
following problems may possibly exist
1) Fuel injector needs to be cleaned(4 fuel injectors
Maintenance tips:
The malfunction has not been finally confirmed.
Please wait for system confirmation.
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