Lifan 620 - LF481 Q3 Engine; If the Engine Fails to Run or Runs Slowly at Start, Carry out the Trouble Diagnosis and Removal Asper Table 1-51

I. LF481Q3 engine
1. If the engine fails to run or runs slowly at start, carry out the trouble diagnosis and removal as
per Table 1-51.
Table 1-51
S/N Operation Test Results Actions
Yes Next step
1
Measure the voltage between the two terminals of the
battery with a multimeter. Is the voltage about
10-12.5V?
No Repair or replace battery
Yes Next step
2
Turn the ignition switch to ON. Measure the voltage
between the ignition switch and the terminal of the
battery positive pole. Is the voltage about 10-12.5V?
No
Repair terminal or replace
lead
Yes Next step
3
Turn the ignition switch to START. Measure the
voltage of the terminal of the ignition switch to connect
with the positive pole of the start motor with a
multimeter. Is the voltage greater than 8V?
No
Repair or replace ignition
switch
Yes Next step
4
Keep the ignition switch in START. Measure voltage of
the terminal of the positive pole of the start motor with
a multimeter. Is the voltage greater than 8V?
No
Repair terminal or replace
lead
Yes Repair or replace start motor
5
Check the start motor for open or short circuit with a
multimeter.
No Next step
Yes Remove the trouble
6 Check if the engine is locked for lack of lubrication.
No Next step
Yes Replace the oil
7
In winter, check if the start motor is affected by high
resistance as improper engine lubricant and gear box
oil is applied.
No Repair or replace timing belt
67
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