Lifan 620 - Slow Acceleration

Table 1-62 (Continued)
S/N Operation Test Results Actions
Yes
Replace fuel pressure
regulator
12
Turn on the fuel gauge valve, and block the fuel return
pipe. Check if the fuel pressure is quickly produced.
No
Repair or replace fuel
injector or fuel pipe
Yes
Repair or replace fuel intake
pipe
13 Check the fuel intake pipe for leakage or blockage.
No Replace fuel pump
Yes
Repair or replace fuel return
pipe
14 Check if the fuel return pipe is blocked or bent.
No
Replace fuel pressure
regulator
Yes Next step
15
Turn the ignition switch to ON. Connect an adapter
between the ECU and the harness. Check the voltage
of the pin J1-24 (signal output end of the throttle
position sensor), J1-05 (grounding end), J1-20 (as the
power supply for 4.5-5V sensor). Is it OK?
No Repair or replace harness
Yes Replace ECU
16
Check the ignition coil, distributor, high voltage wire,
and spark plug for normal operation.
No
Repair or replace relevant
parts
13. Slow acceleration
Table 1-63
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
Run the engine at an idle speed. Check if the rotation
speed is normal.
No
Check and repair as per idle
speed trouble items
Yes Next step
4
Run the engine at an idle speed. Check if the intake
air pressure is between 35kPa and 65kPa.
No Check and repair
82
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