Lifan 620 Maintenance Manual page 78

S/N
Check if the intake air manifold pressure is between
4
35kPa and 65kPa under idle speed.
Connect the fuel pressure gauge valve. Short-circuit the
5
pin 30 and the pin 87 of the fuel bump relay, and run the
fuel pump. Check if the fuel pressure is about 300kPa.
Connect the battery and the fuel injector with a special
6
connector. With the voltage supply of 12V, check the fuel
injector for normal operation.
Clean the fuel injector and check the fuel injector for
7
normal operation.
8 Check if the fuel is wrong or contains water.
9 Check if the fuel pressure is lower than 250kPa.
Close the fuel gauge valve. Turn on the ignition switch
10 again and keep the fuel pump working for 3 seconds.
Check if fuel pressure can be produced.
Turn on the fuel gauge valve, and block the fuel return
11
pipe. Check if the fuel pressure is quickly produced.
12 Check the fuel intake pipe for leakage or blockage.
13 Check if the fuel return pipe is blocked or bent.
Take out the coolant temperature sensor, and check the
15
engine for normal operation.
16 Check the compressed pressure.
Check the resistance of the high voltage wire for each
17
cylinder. Is the resistance OK?
18 Check the ignition coil for damage or crack.
19 Check the spark plug for normal operation.
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Table 1-58 (Continued)
Operation
77
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Test Results Actions
Yes Next step
Remove leakage for the air
No
intake system
Yes Next step
No 9
Yes 8
No Next step
Yes Replace
No Replace fuel injector
Yes Replace fuel
No 14
Yes Next step
No 13
Yes Next step
No 12
Replace fuel pressure
Yes
regulator
Repair or replace fuel
No
injector or fuel pipe
Repair or replace fuel intake
Yes
pipe
No Replace fuel pump
Repair or replace fuel return
Yes
pipe
Replace fuel pressure
No
regulator
Replace coolant temperature
Yes
sensor
No Next step
Yes Next step
No Remove the trouble
Yes Next step
No Replace
Yes Replace
No Next step
Yes Replace ECU
No Replace spark plug