Page 1227 - Foton Workshop Manual - Tunland (AT)

ENGINE CONTROL SYSTEM - ENGINE CONTROL SYSTEM 11-1

ENGINE CONTROL SYSTEM 11

PRECAUTION
1 . Turn off the power.

(a) 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.
(b) 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 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 . Most of electric injection parts are irreparable, and normally change them if parts
are damaged.
12 . ECM shall not be disassembled.

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