Lifan 620 - With Normal Rotation Speed, Difficult to Start

Table 1-53 (Continued)
S/N Operation Test Results Actions
Yes
Replace fuel injector and fuel
pipe
5 Check the fuel injector and the fuel pipe for leakage.
No Next step
Yes
Check the coolant
temperature and line
6
Take out the water temperature sensor, and start the
engine. Is the engine OK?
No Next step
Yes Repair or replace harness
7
Connect an adapter between the ECU and the
harness. Check the pin J1-73 of the ECU for voltage.
Check the positive power supply line of the
above-mentioned ECU pin and the groud wire of the
pin J1-01, J1-17, J1-18 connected to the ECU for
normal operation.
No Next step
Yes End
8
Replace the fuel. Start the vehicle after warm-up. Is it
OK?
No Replace ECU
Yes Next step
9
Check if the fuel pipe is blocked or bent. Check the
fuel pump pressure regulation valve for normal
operation.
No
Repair or replace
Yes Next step
10
Check the interfaces of the fuel pump at both ends for
battery voltage with a multimeter.
No
Repair or replace fuel pump
relay and lead
Yes Next step
11
Check if the resistance of the fuel pump is correct with
a multimeter.
No Replace fuel pump
Yes Replace fuel pump
12 Check if the fuel pump is locked.
Replace ECU
4. With normal rotation speed, difficult to start
Table 1-54
S/N Operation Test Results Actions
Yes Remove the trouble
1
Turn the ignition switch to ON. Check if there is
trouble information records with a diagnostic
instrument.
No Next step
Yes Next step
2 Check the air filter for smoothness.
No Replace
Yes Next step
3
After successful start, check if the intake air manifold
pressure is between 35 kPa and 65kPa at idle speed.
No
Remove leakage for the air
intake system
4
Gently step on the throttle, and check if the vehicle
can be started easily.
Yes
Check and replace throttle
and idle speed passage
70
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