Geely EC718, EC718RV, EC715, EC715RV. Manual part — 31
Geely EC718, EC718RV, EC715, EC715RV. Manual part - 31
Symptoms
Suspected Fault Items
Relevant Sections
degree the engine idle speed
may fluctuate. Any of above
circumstance is likely serious
enough to make the engine
stall.
6. Idle Air Control Valve
7. Crankcase Ventilation Valve
"Auxiliary Emissions Control Device" in
the
Diagnostic Information and Procedures
8. Evaporative Emission (EVAP)
Canister Solenoid Valve
"Auxiliary Emissions Control Device" in
the
Diagnostic Information and Procedures
9. Knock Sensor (KS) System Ignition
Delay
10. Spark Plug: Incorrect thermal value,
damp, crack, incorrect gap, excessive
erosion, excessive carbon residue and
contaminated by fuel
11. Spark Plug Wire Damage
12. Ignition Coil Damage
13. Crankshaft Position Sensor
14. Excessive Engine Oil in Combustion
Chamber or Valve Seals Leakage
"Mechanical System" in the
15. Incorrect cylinder compression
pressure
16. Valve Stagnant or Leaking, Valve
Spring Broken, Incorrect Valve Timing
17. Excessive Carbon Residue in
Combustion Chamber
18. Electromagnetic interference (EMI)
in voltage circuit may lead to engine
Misfire. Use the scan tool to monitor the
engine speed to detect electromagnetic
interference. Engine speed parameter
sudden increase while the actual engine
speed is almost no change indicates
presence of electromagnetic
interference. If there is fault, check
whether there is a high voltage part in the
vicinity of the ignition control circuit.
---
19. Check engine mountings.
"Engine Mechanical System" in the
Engine stalls only when Air-
Conditioning is working.
Fault Definition: when Air-
Conditioning is working,
1. Air-Conditioning signal circuit
"Air-Conditioning System" in the
2. Idle Air Control Valve Stagnant
Engine
Control System JL4G18-D
2-39
Symptoms
Suspected Fault Items
Relevant Sections
engine speed is not stable or
engine stall.
3.ECM
Back fire, Pinging
Fault Definition: Unburned
gases from the combustion
chamber entering into the
intake manifold or exhaust
system, ignited, producing a
very loud pinging sound.
1.ECM Power Supply Circuit
2. Fuel Pressure Abnormal
"Fuel System" in the
.
3. Fuel Contamination
4. Injector Working Abnormal
5. Air leakage in intake system and
crankcase
"Auxiliary Emissions Control Devices" in
the
Diagnostic Information and Procedures
6. Crankcase Ventilation Valve
7. Knock sensor (KS) system ignition
delay too great
"Ignition System" in the
.
8. Spark Plug: Thermal Value Incorrect,
Damp, Crack, Gap Incorrect, Excessive
Erosion, Excessive Carbon Residue,
Contaminated by Fuel
9. Spark Plug Wire Damage
10. Ignition Coil Damage
"Ignition System" in the
.
11. Engine coolant level too low,
thermostat failure
"Engine Cooling System" in the
High Fuel Consumption, Poor
Fuel Economy
Fault Definition: The actual
road test fuel consumption is
significantly higher than
expected. In addition, the fuel
consumption is also
significantly higher than the
previous road test.
1.ECM Power Supply Circuit
2.
•
Air-Conditioning or Defroster Always
On
•
Tire Pressure Incorrect
•
Vehicle Overload
•
Accelerate too fast, too frequent
---
3. Air Cleaner Filter Blocked
---
4. Poor Fuel Quality, Fuel Contamination
"Fuel System" in the
.
5. Fuel Pressure Abnormal
6. Injector Working Abnormal
7. Throttle Body Dirty
"Engine Mechanical System" in the
.
8. Rich Gas and Air Mixture
2-40
Control System JL4G18-D
Engine
Symptoms
Suspected Fault Items
Relevant Sections
9. Air Leakage In Intake System and
Crankcase System
"Auxiliary Emissions Control Devices" in
the
Diagnostic Information and Procedures
10. Crankcase Ventilation Valve
Stagnant
11. Knock Sensor (KS) system ignition
delay too great
"Ignition System" in the
.
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
"Engine Cooling System" in the
16. Excessive engine oil in combustion
chamber or valve seals leak
"Engine Mechanical System" in the
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
"Engine Exhaust System" in the
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.
---
Engine
Control System JL4G18-D
2-41
Symptoms
Suspected Fault Items
Relevant Sections
Surge
Fault Definition: When the
throttle position is stable the
engine power changes. It feels
as if the vehicle speed will rise
and fall when there is no
accelerator pedal position
change.
1. ECM Power Supply Circuit
2. Air-conditioner Compressor
"Air-Conditioning System" in the
3. Heated Oxygen Sensor Abnormal
4. Poor Fuel Quality, Fuel Contamination
"Fuel System" in the
.
5. Fuel Pressure Abnormal
6. Injector Working Abnormal
7. The Air-Fuel Mixture Too Rich
8. The Air-Fuel Mixture Too Lean
9. Spark Plug: Thermal Value Incorrect,
Damp, Crack, Gap Incorrect, Excessive
Erosion, Excessive Carbon Residue,
Contaminated by Fuel
"Ignition System" in the
.
10. Spark Plug Wire Damage
11. Ignition Coil Damage
12. Intelligent Variable Valve Timing
System
"Engine Mechanical System" in the
13. Vacuum Hose Cracking or Kink,
Connection Unreliable
Power Shortage, Accelerate
Pedal Stagnant or Soft to Press
Fault Definition: The engine
power output is lower than
expected. When half-pressing
the accelerator pedal, the
vehicles accelerates a little or
does not accelerate at all.
1. ECM Power Supply Circuit
2. Air Cleaner Filter Blocked
---
3. Poor Fuel Quality, Fuel Contamination
"Fuel System" in the
.
4. Fuel Pressure Abnormal
5. Injector Working Abnormal
6. The Air-Fuel Mixture Too Rich
7. The Air-Fuel Mixture Too Lean
8. Knock Sensor (KS) System Ignition
Delay Too Great
"Ignition System" in the
.
9. Spark Plug: Thermal Value Incorrect,
Damp, Crack, Gap Incorrect, Excessive
Erosion, Excessive Carbon Residue,
Contaminated by Fuel
"Ignition System" in the
.
10. Spark Plug Wire Damage
11. Ignition Coil Damage
2-42
Control System JL4G18-D
Engine
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