Geely EC718 2009 Workshop Manual page 796

2-714 Control System JL4G15-D
The engine control module (ECM) uses information from the crankshaft position (CKP) sensor and the camshaft position (CMP)
sensors to determine when an engine misre is occurring. By monitoring variations in the crankshaft rotation speed for each cylinder
ECM is able to detect individual misre events. When a misfire happens, unburnt mixture will be discharged into the exhaust system
and burnt in the exhaust system. A misre rate that is high enough can cause 3-way catalytic converter damage. The malfunction
indicator lamp (MIL) will ash ON and OFF when the conditions for catalytic converter damage are present. A DTC will be set.
2. DTC Code Set Up and Removal Conditions:
DTC Code DTC Detection Strategy
Under stable operating
conditions, ECM detects the
P0300
crankshaft rotation speed
fluctuations.
EC718/EC718RV EC715/EC715RV 10/2009
Conditions For Setting The DTC
(Control Strategy)
Under stable operating conditions,
when ECM detect fluctuations in the
crankshaft rotation speed exceeds
the preset threshold value and when
a mild misfire occurs, there is no
emergency control programs.
System only records the DTC code
and data flow, and malfunction lamp
light. When there a serious misfire,
the system will be forced into the
open-loop control mode, and the
oxygen sensor learn is not allowed.
The malfunction lamp will flash at 1
Hz frequency.
Fault Locations
1. Connector Loose or Poor
Connection
2. Vacuum Tube Hose Broken or
Loose
3. Ignition System
4. Fuel Injectors
5. Fuel Pressure
6. Intake Air Pressure Sensor
7. Engine Coolant Temperature
Sensor
8. Cylinder Compression Pressure
9. Valve Clearance and Timing
10. Evaporative Emission Control
System
11. Purged Crankcase Ventilation
System
12. Intake System
13. Poor Exhaust System
Ventilation
14. ECM
Engine