Lifan 620. Manual — part 22

2. Start failure of the engine

Common trouble location:

1. No fuel in the tank; 2. Fuel pump; 3. Rotation speed sensor;
4. Ignition coil; 5. Mechanical part of the engine

Diagnosis Flow

Table 1-68

S/N Operation Test

Results

Actions

1

2

3

4

5

89

3. Difficult to start after warm-up

Common trouble location:

1. Fuel with water; 2. Fuel pump; 3. Coolant temperature sensor;
4. Fuel pressure regulator vacuum pipe; 5. Ignition coil.

Diagnosis Flow

Table 1-69

S/N Operation Test

Results

Actions

1

2

3

4

5

6

the pin 3#, 51#, 53#, 61#, 80#. Are they OK?

90

4. Difficult cold start

Common trouble location:
1. Fuel with water; 2. Fuel pump; 3. Coolant temperature sensor; 4. Fuel injector;
5. Ignition coil; 6. Throttle body and idle speed by-pass air way;
7. Mechanical part of the engine.

Diagnosis Flow

Table 1-70

1

2

3

4

5

6

Yes

Remove the mechanical

troubles for the engine

7

Check the pressure of each cylinder of the engine.

Check if the pressure is enough.

No Next

step

Yes Diagnosis

help

8

Connect the electronic injection system adapter. Turn on

the ignition switch. Check the power supply of the pin

12#, 13#, 44#, 45#, 63#. Check the grounding of the pin

3#, 51#, 53#, 61#, 80#. Are they OK?

No

Check and repair relevant

line

91

5. With normal rotation speed, difficult to start at any time
Common trouble location:

1. Fuel with water; 2. Fuel pump; 3. Coolant temperature sensor;
4. Fuel injector; 5. Ignition coil; 6. Throttle body and idle speed by-pass air way;
7. Intake air way; 8. Ignition timing; 9. Spark plug. 10: Mechanical part of the engine.

Diagnosis Flow

Table 1-71

S/N Operation Test

Results

Actions

1

2

3

4

5

6

7

leakage or blockage with a special fuel injector

cleaner & analyzer.

No Next

step

Yes Replace

fuel

8

Check the fuel for normal operation.

No Next

step

Yes

Remove the mechanical

troubles for the engine

9

Check the pressure of each cylinder of the engine.

Check if the pressure is enough.

No Next

step

92