Geely Emgrand X7. Manual part — 29

2.2.7.4 Fault symptom table

If a fault occurs, but the DTC has not been stored in ECM, and its faulty reason can not be
identified in the basic diagnostic, it is suggested to carry out the diagnostic and troubleshooting
based on the listed order in the following table.

Symptoms

Suspected Faulty Items

(Refer to the troubleshooting

scheme)

1. ECM power supply circuit

Refer to 2.2.7.43 DTC P0562 P0563

2. Intake

Manifold

Absolute

Pressure (MAP) Sensor

Refer to 2.2.7.18 DTC P0107 P0108

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 Thick

6. Mixture Too Thin

Refer to 2.2.7.26 DTC P0171 P0172
P1167 P1171 P2187 P2188

7. Ignition system: abnormal spark

plug, abnormal ignition wires.

8. Knock Sensor (KS) system

ignition delay is too large

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

9. Crankshaft Position Sensor

Refer to 2.2.7.35 DTC P0335 P0336

10. Abnormal thermostat

2.8.7 Diagnostic Information and
Procedures in the 2.8 Cooling System

Retardation,
Engine Speed
Decrease, Speed
Instability

Fault Definition:
When pressing
the accelerator
pedal, there is no
immediate
response. This
fault may occur
at any vehicle
speed. Start the
vehicle for the
first time (for
example, start
after parking),
this fault is
usually more
obvious. In
severe cases, this
fault may lead to
engine stalling.

11. Abnormal Working of

Generators

Refer to 2.11.7 Diagnostic
Information and Procedures in the
2.11 Start and Charging System

1. Electronic Throttle Body

Refer to 2.2.7.53 DTC P2135

Fault Definition
for engine
stalling during
air-conditioning
works only: when
Air-
Conditioning is
working, Engine
Speed Instability
or Stalling

2. ECM

See 2.2.8.1 Replacement of Engine
Control Module.

1. ECM power supply circuit

Refer to 2.2.7.43 DTC P0562 P0563

2. Mixture Too Thick

Refer to 2.2.7.26 DTC P0171 P0172
P1167 P1171 P2187 P2188

High Fuel
Consumption,
Poor Fuel
Economy

Fault definition:
oil consumption

3. Air Filter Blocked

-

115

4. Poor Fuel Quality, Fuel

Contamination

5. Abnormal Fuel Pressure

6. Abnormal

Injector

Working

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

7. Electronic Throttle Body

Refer to 2.2.7.53 DTC P2135

8. The driver has the following

driving habits:

•

Air-Conditioning or defroster is
always on

•

Tire pressure is incorrect

• Vehicle

Overload

•

Accelerate too Fast, too frequent

-

9. Air Leakage In Intake System

and Crankcase System

10. Positive crankcase ventilation

valve catching

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

11. Knock Sensor (KS) system

ignition delay is too large

12. Spark Plug: Incorrect thermal

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

13. Spark Plug Wire Damage

14. Ignition Coil Damage

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

15. Coolant Level Too Low,

Thermostat Malfunction

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

measured by
actual road test is
obviously high
than

Expected value
In addition, the
fuel consumption
is also
significantly
higher than the
previous road
test.

16. Too Much Oil in Combustion

Chamber or Valve Seals
Leakage

17. Incorrect Cylinder Compression

Pressure Ensure

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

1. Valve Catching or Leakage,

Broken Valve Spring, Incorrect
Valve Timing

High Fuel
Consumption,
Poor Fuel
Economy

Fault Definition:
The actual road

2. Too much carbon residue in

combustion chamber

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

116

3. Vacuum Hose Cracking or Kink,

Connection Unreliable

4. 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

5. Brake

System

Dragging

or

Operation Abnormally

Refer to 6.2.4 Diagnostic Information
and Procedures in 6 Brake System

test fuel
consumption is
significantly
higher than
expected. In
addition, the fuel
consumption is
also significantly
higher than the
previous road
test.

6. 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 malfunction, inspect
whether there is a high voltage
component in the vicinity of the
ignition control circuit.

-

1. ECM power supply circuit

Refer to 2.2.7.43 DTC P0562 P0563

2. Air Filter Blocked

-

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 Thick

6. Mixture Too Thin

Refer to 2.2.7.26 DTC P0171 P0172
P1167 P1171 P2187 P2188

7. Electronic Throttle Body

Refer to 2.2.7.53 DTC P2135

8. Knock Sensor (KS) system

ignition delay is too large

9. Spark Plug: Incorrect thermal

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

10. Spark Plug Wire Damage

11. Ignition Coil Damage

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

Lack of Fuel
Supply, Misfire

Fault Definition:
After the engine
speed increases,
there is
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.

12. Crankshaft Position Sensor

Refer to 2.2.7.35 DTC P0335 P0336

117

1. Too Much Oil in Combustion

Chamber or Valve Seals
Leakage

2. Cylinder

compression

pressure

is incorrect

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

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

Lack of Fuel
Supply, Misfire

Fault Definition:
After the engine
speed increases,
there is
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.

9. Exhaust

Blocked:

Three-Way

Catalytic Converter Blocked,
Muffler Internal Damage

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

1. ECM power supply circuit

Refer to 2.2.7.43 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 2.2.7.53 DTC P2135

7. Acceleration

Pedal

Position

Sensor

Refer to 2.2.7.54 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

Fault definition
for badness,
instability, error
or under speed 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.

11. Spark Plug: Incorrect thermal

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

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

118