Maintenance Manual for J2 Sedan
Electronic Control System
of Engine
156
Even with engine stopped, there is high pressure in fuel pipelines. Therefore, the fuel pipe should
not be dismantled casually during the course of maintenance. In case that it is necessary to repair
fuel system, pressure in fuel system should be released before dismantlement of fuel pipe.
3. The dismantlement of fuel pipe and the replacement of fuel filter should be carried out by the
special personnel in well-ventilated area.
4. Power supply of electric fuel pump should be turn off before pump is removed from fuel tank in
order to avoid sparks that may cause fire. The fuel injection pump should not be test with dry state
or in water, otherwise its service life may be shortened. In addition, the positive and negative poles
of the fuel injection pump must not be reversed.
5. During inspection of ignition system, the sparking should be detected only when it is necessary and
the time should be as short as possible. The air throttle must not be opened during inspection;
otherwise copious unburned full may flow into the exhaust pipe, accordingly leading to the damage
of three-way catalyst.
6. The manual adjustment is unnecessary because the idling regulation is completed solely by the
electronic controlled injection system. The throttle limiting screw of throttle body has been adjusted
by the manufacturer in factory; the initial position must not be changed by users arbitrarily.
7. Terminals of battery must not be reversed, otherwise electronic components may be damaged.
Negative grounding is used in this system.
8. Battery cable should not be disconnected with engine running. Before welding on vehicle, cable on
negative and positive poles of battery, and all electronic components should be removed.
9. Do not test input and output signal of components by puncturing the insulator of wire.
