Slow Acceleration - Lifan 620 Maintenance Manual

S/N
Turn on the fuel gauge valve, and block the fuel return
12
pipe. Check if the fuel pressure is quickly produced.
13 Check the fuel intake pipe for leakage or blockage.
14 Check if the fuel return pipe is blocked or bent.
Turn the ignition switch to ON. Connect an adapter
between the ECU and the harness. Check the voltage
15 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?
Check the ignition coil, distributor, high voltage wire,
16
and spark plug for normal operation.

13. Slow acceleration

S/N
Turn the ignition switch to ON. Check if there is
1 trouble information records with a diagnostic
instrument.
2 Check the air filter for smoothness.
Run the engine at an idle speed. Check if the rotation
3
speed is normal.
Run the engine at an idle speed. Check if the intake
4
air pressure is between 35kPa and 65kPa.
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Table 1-62 (Continued)
Operation
Table 1-63
Operation
82
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Test Results Actions
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
Yes Next step
No Repair or replace harness
Yes Replace ECU
Repair or replace relevant
No
parts
Test Results Actions
Yes Remove the trouble
No Next step
Yes Next step
No Replace
Yes Next step
Check and repair as per idle
No
speed trouble items
Yes Next step
No Check and repair