Lifan X60, Руководство по обслуживанию, Страница: 31 / 839

LIFAN X60 Service Manual
23. Before dismantling any fuel line, first release fuel system pressure. When repairing
fuel line system, please keep away from open fire.
24. Poor contact may be due to connector terminal corrosion, external dirt intruding into
the terminal or contact pressure reduction between connector plug and socket. Disconnect
the connector and then reconnect it. Normal contact may be restored. When making fault
diagnosis, check if wire harness and connector are abnormal and confirm they are normal.
But, after checking, the fault disappears. It may be wiring or connector fault.
25. When washing or overhauling the engine on a rainy day, water shall be prevented from
splashing on ECM and other circuits.
26. Electronic control system faults are mainly wire harness and connector faults.
Normally, wire harness is broken, connector is poor contact, connector terminal is pulled
out or not inserted completely or the accessory is earthing.
27. As wire harness is seldom broken in its middle section and often broken at the
connector section in most case, it is necessary to carefully inspect wire at sensor and
connector.
28. Before connecting the V30 diagnostic scanner, be sure to turn off the ignition switch
(turn it to OFF). After the completion of connecting the diagnostic scanner, turn on the
ignition switch (turn it to ON).
Fuel Supply System Control Logic
1. Fuel Pump Logic
(1) Fuel pump “ON” logic
After the ignition switch is turned on, the fuel pump will run for 2 seconds;
If no effective 58X signal is detected, the fuel pump will stop running;
The engine starts to run, as soon as effective 58X signal is detected by ECM, the fuel
pump will start running.
(2) Fuel pump “OFF” logic
The fuel pump will stop running 0.6s after the rotation speed signal is lost or the fuel
pump will stop running
30
mashinesoft.com
09120146259