Page 228 - Foton Workshop Manual - Aumark (BJ1099)

11-2 ENGINE CONTROL SYSTEM - ENGINE CONTROL SYSTEM

NOTICES

1. To prevent the damage to the persons or vehicles, before removing or installing any
electric units and when the tools or equipments have easy access to the exposed
electrical terminals, the battery negative cable must be firstly disconnected and
connected in the end. Unless otherwise indicated, the ignition switch must be off.
DANGER:
Before connecting or disconnecting the battery negative cable, both ignition switch and
lighting switch must be off. (If not, it may damage the semiconductor component)

2. While implementing the maintenance, the adjustment, disassembly and assembly
and detection shall be conducted according to all the provisions as introduced in
this manual.
3. The components and parts of electronic injection system has a higher reliability,
when entire car or engine arise abnormity, first check the conditions of relevant
mechanical parts, system connector and wiring harness, ground wire, high tension
wire interface of spark plug and vacuum pipe of oil pressure regulator, etc.
4. Before installing the components and parts, clean the installation surface with FIPG
scraper or wire brush and ensure the surface is flat and smooth without oil. Do not
forget to clean the sealant in the assembly holes and bolts holes as well as on the
screw thread.
5. During the installation of components of sensors and actuators, the bolts shall be
screwed down and fixed according to the specified value.
6. Unless otherwise specified during the process, a pointer multimeter shall not be
used to test ECM and sensor;instead, a high impedance digital multimeter shall be
used for testing.
7. When installing and moving sensor, to ensure no damage to it, the sensor must be
handled with care. Any impact and drop may properly cause great damage to its
performance.
8. When battery voltage is low or starting motor goes out of order, it is not allowed to
start engine for a long time, so as to avoid damaging ternary catalytic converter.
9. The method of fine needle punching wiring harness is not allowed to use to check
system electric signal.
10. When removing and replacing the oxygen sensor, the oxygen sensor shall not be
contacted with water or other liquid.
11. The fuel pump shall not be operated for a long time under the condition of no
gasoline.
12. Most of electric injection parts are irreparable, and normally change them if parts
are damaged.
13. The system shall use the anti-jamming spark plug and high tension wire. Non-
resistible spark plug and high tension wire will not only release interference wave,
but also exert an unfavored effect on driver module of ignition coil in ECM.
14. ECM shall not be disassembled.

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