Security Items For The Diagnosis And Maintenance Of The Fuel Injection Electronic Control System; Security Measures - Lifan 620 Maintenance Manual

Section V Security Items for System Maintenance

1. Security items for the diagnosis and maintenance of the fuel injection electronic control system

(1) Remove and install requirements for the controller
Remove the controller before welding and paint baking;
①
Turn the ignition switch to OFF when remove the controller to avoid damage;
②
When the engine is running or
③
the battery;
Do not st art the engine with high electricity from charger;
④
The ambient temperature of the controller shall not exceed 80
⑤
(2) Requirements on cleanness:
① Before operate the oil supply and injection system, please abide by the following demands:
The parts a nd components removed should be covered and placed in a clean field, and do not
②
use the cloth scattering fibers.
(3) Connect and disconnect the harness (including the harness of the trouble diagnostic
instrument) only after turn off the ignition switch.
To ensure correct wire connection when measuring the voltage or grounding of the electronic
control system.
To disconnect the power supply wire or the harness of the controller connector from the battery
can erase the relevant diagnosis and self-learning information.
(4) Notes for fuel supply system maintenance
① Take care when remove and install the fuel pump for a fuel tank fully or partially filled.
Before the maintenance, the device to absorb the gasoline leaked should be installed near the
②
fuel tank mouth.
To avoid direct contact with the gasoline;
③
Before loosening the connection parts, thoroughly clean these parts and the surrounding areas.
④
⑤ To avoid fuel injection at the loosened part, place a cloth around the connection part;
Carefully cover or close the opened parts and components if not repaired at once.
⑥
Take out the spare parts just before the installation. The spare parts without packaging shall not
⑦
be used.
Take care not to damage the O
⑧
apply a little lubricant to the O-ring.
After the system being opened, try not to use compressed air and make the vehicle move.

2. Security measures

To avoid personal injury and damage the fuel injection and ignition device:
Do not connect or disconnect the ignition harness if the engine is under operation or at a rotation speed
for start-up; disconnect the harness connector from the hall sensor (distributor) if the engine is driven by
the starting motor yet not actually started (like compressed pressure check, etc).
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the electrical system is under operation, do not disconnect with
-ring when installing the fuel injector. To facilitate assembly,
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