Page 241 - Foton Workshop Manual - Tunland (AT)

DIAGNOSTICS - ENGINE CONTROL SYSTEM 04-95

ENGINE CONTROL SYSTEM

PRECAUTION
1 . Disconnect the Power Supply

• When disassembling or installing any electric unit, or touching the exposed
electrical terminal with tools or devices, disconnect the negative battery cable
04
firstly, and connect the negative battery cable at last so as to avoid personal
injury or damage to the vehicle.
• Turn off the ignition if not otherwise specified.

DANGER

Before connecting or disconnecting the negative battery cable, do turn off the ignition
switch and lighting switch (if not, the semiconductor element may be damaged)
WARNING
If the vehicle is equipped with central console lock, don't leave the key inside the
vehicle before disconnecting the negative battery cable, or it may automatically lock
up.

2 . The daily odometer and clock of combination instrument may be zero-cleared
once the combination instrument is dismounted or the negative pole of battery
is disconnected.

DANGER
The overall speedometer cannot be reset to zero.

3 . Disconnect negative cable of the battery can make the sound system lose the
stored settings.
WARNING

When reconnecting the negative cable of the battery, the sound system should be
reset.

4 . Ignition switch representation

Ignition switch (location) Ignition switch representation
LOCK Ignition Switch: OFF.

ACC Ignition Switch ACC

ON Ignition Switch: ON.
START Start the engine.

5 . Precautions for failure shooting of the engine control system
(a) It is strictly forbidden to disconnect the battery from the circuit when engine runs at
high speed, so as to avoid transient overvoltage that may damage the ECM and
sensors.
(b) To carry out electric welding on the vehicle body, the ECM power supply shall be
disconnected firstly. Special attention shall be paid to that when repairing an element
of the vehicle body which is close to the ECM or sensors.

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