Page 2635 - Foton Workshop Manual - Sauvana

DIAGNOSIS-ENGINE CONTROL SYSTEM 62-583
P0300，P0301，P0302，P0303，P0304 - MISFIRE FAULT

P0300-Multi-cylinder fire occurred
P0301-No.1 cylinder fire occurred
P0302-No.2 cylinder fire occurred
P0303-No.3 cylinder fire occurred
P0304-No.4 cylinder fire occurred 62

General

1. Cylinder misfire means the mixture gas can’t be burned in the cylinder during the
engine working.
2. If the engine EFI control unit detects the misfire that may cause damages to the
catalytic convertor, the fault indicator willblink, and it should turn off the engine
immediately.
3. When the engine running timeis longer than 60s, and the cooling liquid temperature
is higher than70℃ , the system detects that the speed fluctuation of the revolution
sensor exceeds thesystem set value, it will trigger the fault code. This fault code
indicates that many cylinders misfired or engine EFI control unitcan’t identify
which cylinder is misfired. The fault reasons include the mechanical fault of cylinder,
fuel metering error, toohigh or too low of the fuel pressure, the fault of evaporative
emission system, the failure of ignition system and air intake system failure etc.

Diagnosis Procedure

Notice：
• Before the diagnosis, ensure that engineECUand the connector of the ignition coil
connect well.
• Before performing a diagnosis and testing, refer to circuit diagrams and component
information.
• Before performing the test, check whether the connector pins are ruptured, loosened or
corroded, to ensure proper contact of pin.
• If the engine electronic control system stores other DTCs except misfire DTC , it should
first troubleshoot these DTCs.

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