Geely Emgrand X7. Manual part — 171

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