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