Geely EC718 2009 Workshop Manual page 123

Engine
Symptoms Suspected Fault Items
9. Air Leakage In Intake System and
Crankcase System
10. Crankcase Ventilation Valve
Stagnant
11. Knock Sensor (KS) system ignition
delay too great
12. Spark Plug: Thermal Value Incorrect,
Damp, Crack, Gap Incorrect, Excessive
Erosion, Excessive Carbon Residue,
Contaminated by Fuel
13. Spark Plug Wire Damage
14. Ignition Coil Damage
15. Engine coolant level too low,
thermostat failure
16. Excessive engine oil in combustion
chamber or valve seals leak
17. Cylinder Compression Pressure
Incorrect
18. Valve stagnant or leak, broken valve
spring, valve timing incorrect
19. Excessive Carbon Residue in
Combustion Chamber
20. Vacuum Hose Cracking or Kink,
Connection Unreliable
21. Exhaust not Smooth: Three-way
Catalytic Converter Plug, Muffler Internal
Damage
22. Braking System Dragging or
Operation Abnormal
23. Electromagnetic Interference (EMI)
in the voltage circuit may lead to engine
Misfire. Use the scan tool to monitor the
engine speed to detect electromagnetic
interference. Engine speed parameters
sudden increase while the actual engine
speed is almost no change indicates the
presence of electromagnetic
interference. If there is a fault, check
whether there is a high voltage part in the
vicinity of the ignition control circuit.
Control System JL4G18-D
Relevant Sections
"Auxiliary Emissions Control Devices" in
the2.4.6 Diagnostic Information and
"Ignition System" in the2.10.7 Diagnostic Information
and Procedures.
"Engine Cooling System" in
Information and Procedures.
"Engine Mechanical System" in
Information and Procedures.
"Engine Exhaust System" in
Information and Procedures.
"Braking System" in the6.4.4 Diagnostic Information
and Procedures.
EC718/EC718RV EC715/EC715RV 10/2009
2-41
Procedures.
the2.8.7 Diagnostic
the2.6.7 Diagnostic
the2.7.5 Diagnostic
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