JAC J2 User Manual



Maintenance Manual for J2 Sedan
Electronic Control System
of Engine
173
IV
.
Engine T
rouble
Diagnosis
1.

Trouble diagnosis general for engine control system
In case of failure with Engine Electronic control system components (such as sensor, ECM, injector),
fuel may be cut off or insufficient fuel will be supplied resulting in following conditions:
a.

Starting hardship or failure of engine
b.

Unstable idle
c.

Poor
drivability
If any of these situations occurs, first of all, carry out the regular inspection including the basic
inspection of engine (ignition system trouble and correct adjustment of engine etc.). Then inspect the
sub-assemblies of the electronic control system with trouble diagnose apparatus.
Attention
:
■
Before dismantling
or
installing any
component, read
the DTC
at
first and
then disconnect
battery negative poles.
■
Before discon
necting b
attery cables
, firstly tu
rn off the i
gnition swi
tch. If batt
ery cable is
disconnected with engine rungin or ignition at ON
position, ECM may be
damaged.
■ The harness between
the EC
M and
sensor
should be
shielded
by the
grounding
wire connected to
the vehicle body in order to prevent the interference from the ignition system and radio. If fails,
the harness should be replaced.
■
When checking
the
charging state
of engine,
don’t
disconne
ct the
negative pole
of
battery to
prevent dam
age of ECM.
■
When using
the out
side charger
to
charge the
battery, it
is n
ecessary to
disconnect battery cable
to prevent damage of ECM.

JAC J2 Specifications

General

Brand	JAC
Model	J2
Category	Automobile
Language	English