Geely EC718 2009 Workshop Manual page 692

2-610 Control System JL4G15-D
Symptoms
Detonation, Ignition Knock
Fault Definition: Knocking sound is
worsen during accelerating. With the
throttle opening changes, the engine
will generate a sharp metal knocking
sound.
Difficulty In Starting The Engine
Fault Definition: The engine crankshaft
rotation is normal, but the vehicle can
not start for a long time. Eventually the
vehicle will be able to start, but it the
engine may shut down immediately.
EC718/EC718RV EC715/EC715RV 10/2009
Suspected Faulty Items
20. Electromagnetic interference (EMI) on
voltage circuit may lead to misfire. Use a scan
tool to monitor the engine speed to detect
electromagnetic interference. Engine speed
parameter suddenly increase while the actual
engine speed is almost not changed, then there
is electromagnetic interference. If there is a
malfunction, check whether there is a high
voltage component in the vicinity of the ignition
control circuit.
1. ECM Power Supply Circuit
2. Incorrect Fuel
3. Fuel Pressure Abnormal
4. Injector Working Abnormal
5. Mixture Too Lean
6. Knock Sensor (KS) System Ignition Delay Too
Great
7. Spark Plug Heat Value Incorrect
8. Cooling system: Coolant level is too low,
coolant is incorrect, coolant leaks, cooling fan is
not running
9. Too Much Oil In Combustion Chamber and
The Valve Seal Leaking
10. Cylinder Compression Pressure Too High
11. Too Much Carbon Residue In Combustion
Chamber
12. Camshaft, Cylinder
Connecting Rod and Bearing Abnormal
1. Too Much Oil In Combustion Chamber and
The Valve Seal Leaking
2. Too Carbon Residue In Combustion Chamber
3. Timing Chain Installation Incorrect
4. Cylinder Compression Pressure Incorrect
5. Fuel Pump Relay, Fuel Pump, Fuel Injector,
Fuel Contamination
Refer to
Refer to2.13 Fuel System JL4G15-
Din2.13.1 Diagnostic Information and
Procedures
Refer to
P1167 P1171 P2187 P2188
Refer to2.20 Ignition System JL4G15-
Din2.20.4 Diagnostic Information and
Procedures
Refer to2.18 Engine Cooling System
JL4G15-Din2.18.3
Information and Procedures
Refer to2.6 Engine Mechanical System
JL4G18-Din2.6.7
Information and Procedures
Head, Piston,
Refer to2.6 Engine Mechanical System
JL4G18-Din2.6.7 Diagnostic
Information and Procedures
Refer to2.13 Fuel System JL4G15-
Din2.13.1 Diagnostic Information and
Procedures
Engine
Relevant Sections
-
2.12.7.43 DTC P0562 P0563
2.12.7.26 DTC P0171 P0172
Diagnostic
Diagnostic