3.  Valve Stagnant or Leakage 

4.  Camshaft Convex Corner Wear 

5. Valve 

Timing 

Incorrect 

6. Valve 

Spring 

Broken 

7.  Too much carbon residue in 

combustion chamber 

8.  Abnormal Camshaft, Cylinder 

Hood, Piston, Connecting Rod 
and Bearing 

continuous 
pulsation, or 
jitter, usually 
even more 
noticeable with 
the engine load 
increases. When 
the engine speed 
is above 1,500 
rpm, the fault 
does not appear 
with running. 

9.  Exhaust Blocked: Three-Way 

Catalytic Converter Blocked, 
Muffler Internal Damage 

Refer to 2.7.5 Diagnostic Information 
and Procedures in the 2.7 Exhaust 
System 

1.  ECM power supply circuit 

Refer to 2.12.7.43 DTC P0562 P0563

2.  Air Filter Blocked 

- 

3.  Abnormal Fuel Pressure 

4. Fuel 

Contamination 

5.  Abnormal Injector Working 

Refer to 2.3.7 Diagnostic Information 
and Procedures in the 2.3 Fuel 
System 

6.  Electronic Throttle Body 

Refer to 2.12.7.53 DTC P2135 

7. Acceleration Pedal Position 

Sensor 

Refer to 2.12.7.54 DTC P2138 

8.  Positive Crankcase Ventilation 

Valve 

9. Evaporative 

Emission 

(EVAP) 

Canister Solenoid Valve 

10. Knock Sensor (KS) system 

ignition delay is too large 

Refer to 2.4.6 Diagnostic Information 
and Procedures in the 2.4 Auxiliary 
Emission Control Devices 

11. Spark Plug: Incorrect thermal 

value, damp, crack, incorrect 
gap, excessive erosion, 
excessive carbon residue, 
contaminated by fuel 

12.  Spark Plug Wire Damage 

13. Ignition Coil Damage 

Refer to 2.10.7 Diagnostic 
Information and Procedures in the 
2.10 Ignition System 

14.  Crankshaft Position Sensor 

Refer to 2.12.7.35 DTC P0335 P0336

Fault definition 
for badness, 
instability, error 
or underspeed of 
idle speed: 
starting in the 
course of idling. 

Engine runs 
unsteadily. In 
extreme cases, 
the engine or the 
vehicle will 
tremble. Engine 
idle speed under 
the condition that 
the throttle valve 
opening is certain

The speed may 
be fluctuated. 
Any of these 
circumstances is 
likely to be 
serious enough to 
make the engine 
stall. 

15.  Too Much Oil in Combustion 

Chamber or Valve Seals 

Refer to 2.6.7 Diagnostic Information 
and Procedures in the 2.6 Mechanical 

683

Leakage 

16. Cylinder compression pressure 

is incorrect 

System 

1.  Valve Catching or Leakage, 

Broken Valve Spring, Incorrect 
Valve Timing 

2.  Too much carbon residue in 

combustion chamber 

3.  Inspect engine support seat. 

Refer to 2.6.7 Diagnostic Information 
and Procedures in the 2.6 Mechanical 
System 

Fault definition 
for badness, 
instability, error 
or underspeed of 
idle speed: 
starting in the 
course of idling. 

Engine runs 
unsteadily. In 
extreme cases, 
the engine or the 
vehicle will 
tremble. With a 
certain throttle 
opening, the 
engine idle speed 
may fluctuate. 
Any of these 
circumstances is 
likely to be 
serious enough to 
make the engine 
stall. 

4. Electromagnetic  Interference 

(EMI) in the voltage circuit may 
lead to engine misfire. Use a 
fault diagnosis tester to monitor 
the engine speed to detect 
electromagnetic interference. 
Engine speed parameter 
suddenly increases while the 
actual engine speed does almost 
not change, then there is 
electromagnetic interference. If 
there is a fault, inspect whether 
there is a high voltage 
component in the vicinity of the 
ignition control circuit. 

- 

1.  ECM power supply circuit 

Refer to 2.12.7.43 DTC P0562 P0563

2.  Incorrect Fuel No. 

3.  Abnormal Fuel Pressure 

4.  Abnormal Injector Working 

Refer to 2.3.7 Diagnostic Information 
and Procedures in the 2.3 Fuel 
System 

5.  Mixture Too Thin 

Refer to 22.12.7.26 DTC P0171 
P0172 P1167 P1171 P2187 P2188 

6.  Knock Sensor (KS) system 

ignition delay is too large 

7.  Spark Plug Heat Value Incorrect 

Refer to 2.10.7 Diagnostic 
Information and Procedures in the 
2.10 Ignition System 

8.  Cooling system: too low oil 

level, incorrect coolant, coolant 
leakage, cooling fan does not 
rotate 

Refer to 2.8.7 Diagnostic Information 
and Procedures in the 2.8 Cooling 
System 

9.  Too Much Oil in Combustion 

Chamber and the Valve Sealing 
Leaking 

Fault Definition 
for Conflagration 
and Ignition 
Knocking: 
Knocking sound 
is worsen during 
accelerating. 
With the throttle 
opening changes, 
the engine will 
generate a sharp 
metal beating 
sound at the 
cylinder. 

10.  Cylinder compression [reassure 

too high 

Refer to 2.6.7 Diagnostic Information 
and Procedures in the 2.6 Mechanical 
System 

684

11 .  Too much carbon residue in 

combustion chamber 

12. Abnormal Camshaft, Cylinder 

Hood, Piston, Connecting Rod 
and Bearing 

Refer to 2.6.7 Diagnostic Information 
and Procedures in the 2.6 Mechanical 
System 

1.  Too Much Oil in Combustion 

Chamber and the Valve Sealing 
Leaking 

2.  Excessive Carbon Residue in 

Combustion Chamber 

3. Timing  Chain  Installation 

Incorrect 

4. Cylinder 

compression 

pressure 

is incorrect 

Refer to 2.6.7 Diagnostic Information 
and Procedures in the 2.6 Mechanical 
System 

Engine difficult 
to start 

Fault Definition: 
The engine 
crankshaft 
rotation is 
normal, but the 
vehicle can not 
be started in a 
long time. The 
engine is finally 
able to start, but 
may immediately 
stop. 

fire. 

5.  Fuel Pump Relay, Fuel Pump, 

Fuel Injector, Fuel 
Contamination 

Refer to 2.3.7 Diagnostic Information 
and Procedures in the 2.3 Fuel 
System 

1.  Ignition System: Ignition Wire, 

Spark Plug, Ignition Coil 

Refer to 2.10.7 Diagnostic 
Information and Procedures in the 
2.10 Ignition System 

2.  ECM Power Supply 

Refer to 2.12.7.43 DTC P0562 P056 

3. Engine coolant temperature 

sensor 

Refer to2.12.7.20 DTC P0117 P0118

4.  Electronic Throttle Body 

Refer to 2.12.7.53 DTC P2135 

Engine difficult 
to start 

Fault Definition: 
The engine 
crankshaft 
rotation is 
normal, but the 
vehicle can not 
be started in a 
long time. The 
engine is finally 
able to start, but 
may immediately 
stop. 

fire. 

5. Acceleration Pedal Position 

Sensor 

Refer to 2.12.7.54 DTC P21388 

1.  ECM power supply circuit 

Refer to 2.12.7.43 DTC P0562 P0563

2.  Abnormal Fuel Pressure 

3. Fuel 

Contamination 

4.  Abnormal Injector Working 

Refer to 2.3.7 Diagnostic Information 
and Procedures in the 2.3 Fuel 
System 

5.  Air Leakage in Intake System 

and Crankcase 

6.  Positive Crankcase Ventilation 

Valve 

Refer to 2.4.6 Diagnostic Information 
and Procedures in the 2.4 Auxiliary 
Emission Control Devices 

Fault Definition 
for back fire and 
blast: Unburned 
gases entering 
the intake 
manifold or the 
exhaust system 
will be ignited, 
producing a very 
loud cracking 
sound. 

7.  Knock Sensor (KS) system 

ignition delay is too large 

Refer to 2.12.7.34 DTC P0324 P0325

685

8.  Spark plug: incorrect heat value, 

humidified, cracked, incorrect 
clearance, excessive burning 
Carbon deposit is too much. It is 
polluted by fuel. 

9.  Spark Plug Wire Damage 

10. Ignition Coil Damage 

Refer to 2.10.7 Diagnostic 
Information and Procedures in the 
2.10 Ignition System 

11. Coolant level is too low, 

thermostat is faulty. 

2.8.7 Diagnostic Information and 
Procedures in the 2.8 Cooling System

1.  ECM power supply circuit 

Refer to 2.12.7.43 DTC P0562 P0563

2. Air-Conditioning 

Compressor 

Refer to 8.2.7 Diagnostic Information 
and Procedures in 8.2 Automatic 
Air-conditioning 

3.  Abnormal Heated Type Oxygen 

Sensor 

Refer to 2.12.7.22 DTC P0131 P0132 
P0133 P0134. 

4. Poor Fuel Quality, Fuel 

Contamination 

Refer to 2.3.7 Diagnostic Information 
and Procedures in the 2.3 Fuel 
System 

5.  Abnormal Fuel Pressure 

6.  Abnormal Injector Working 

Refer to 2.3.7 Diagnostic Information 
and Procedures in the 2.3 Fuel 
System 

7.  Mixture Too Thick 

Fault Definition 
for surge: When 
the throttle 
opening is stable, 
the engine power 
changes. The 
vehicle speed 
changes while 
the acceleration 
pedal position 
does not change. 

8.  Mixture Too Thin 

Refer to 2.12.7.26 DTC P0171 P0172 
P1167 P1171 P2187 P2188 

9. Intelligent  Variable  Valve 

Timing System 

10. Vacuum Hose Cracking or 

Kink, Connection Unreliable 

Refer to 2.6.7 Diagnostic Information 
and Procedures in the 2.6 Mechanical 
System 

11. Spark Plug: Incorrect thermal 

value, damp, crack, incorrect 
gap, excessive erosion, 
excessive carbon residue, 
contaminated by fuel 

12.Spark plug guide wire damaged 

 

13. Ignition Coil Damage 

Refer to 2.10.7 Diagnostic 
Information and Procedures in the 
2.10 Ignition System 

1.  ECM power supply circuit 

Refer to 2.12.7.43 DTC P0562 P0563

2.  Air filter element plug 

- 

Fault definition 
for insufficient 
power, viscosity 
or weakness: The 
engine power 
output is lower 

3. Poor Fuel Quality, Fuel 

Contamination 

Refer to 2.3.7 Diagnostic Information 
and Procedures in the 2.3 Fuel 

686