Geely Emgrand X7. Manual part — 170

3

Inspect the wiring harness and connector.

A. Many intermittent faults are caused by vibration, distortion, uneven roads, and improper

operation of components or connectors dislocation.

B. If the circuit resistance is too high, it may result in components can not work properly. Use a

fault diagnosis tester to drive the actuators, if not working, inspect whether the resistance in
the circuit is too high or other wire faults.

4

Reproduce the fault and use instruments to record engine control module data.

A. Connect a fault diagnosis tester and use the data record function to record road test data

during the occurrence of the intermittent fault. After pressing the vehicle data recorder button,
the scan tool can record engine control module data when intermittent fault occurs, and then
the data can be used to identify the fault location.

B. Another diagnostic method is when the vehicle is driven connect a digital multimeter to the

suspicious circuit. Digital multimeter abnormal readings may indicate the fault location.

5

Fault indicator gives intermittent light, but a DTC is not set in the system.

The following conditions may cause intermittent fault indicator light, but the system does not set
the DTC:

A. Electromagnetic interferences are caused by relay, solenoid valve or switch controlled by

ECM, which work abnormally.

B. Non-original or after-sale accessories, such as phone, alarm, lamp or radio equipment, are not

installed properly.

C. Intermittent fault indicator light control circuit short to ground.

D. Engine control module ground point is loose.

6 Other

inspections

A. Test whether Air-Conditioning compressor clutch diodes at both ends and other diodes are in

open circuit.

B. Inspect whether there are following conditions existing in charging system:

z Generator rectifier fault within the electrical system may result in the alternating current

signal interference.

z Generator output voltage is correct or not. If the generator output voltage is lower than 9V or

higher than 18V, repair the charging system.

7

Enter Fault Symptom Table

Next

Next

Next

Next

679

2.12.7.4 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 2.12.7.43 DTC P0562 P0563

2. Intake Manifold Absolute

Pressure (MAP) Sensor

Refer to 2.12.7.18 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 2.12.7.26 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 2.12.7.35 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 2.12.7.53 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 2.12.8.1 Replacement of Engine
Control Module.

1. ECM power supply circuit

Refer to 2.12.7.43 DTC P0562 P0563

2. Mixture Too Thick

Refer to 2.12.7.26 DTC P0171 P0172
P1167 P1171 P2187 P218

3. Air Filter Blocked

-

High Fuel
Consumption,
Poor Fuel
Economy

Fault definition:
oil consumption
measured by
actual road test is
obviously high

4. Poor Fuel Quality, Fuel

Contamination

Refer to 2.3.7 Diagnostic Information
and Procedures in the 2.3 Fuel

680

5. Abnormal Fuel Pressure

6. Abnormal Injector Working

System

7. Electronic Throttle Body

Refer to 2.12.7.53 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

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

2. Too much carbon residue in

combustion chamber

3. Vacuum Hose Cracking or

Kink, Connection Unreliable

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

High Fuel
Consumption,
Poor Fuel
Economy

Fault Definition:
The actual road
test fuel
consumption is
significantly
higher than
expected. In

4. Exhaust Blocked: Three-Way Refer to 2.7.5 Diagnostic Information

681

Catalytic Converter Blocked,
Muffler Internal Damage

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

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 2.12.7.43 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 2.12.7.26 DTC P0171 P0172
P1167 P1171 P2187 P2188

7. Electronic Throttle Body

Refer to 2.12.7.53 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 2.12.7.35 DTC P0335 P0336

1. Too Much Oil in Combustion

Chamber or Valve Seals
Leakage

Lack of Fuel
Supply, Misfire

Fault Definition:
After the engine
speed increases,
there is

2. Cylinder

compression

pressure

is incorrect

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

682