JAC J2 User Manual



Maintenance Manual for J2 Sedan
Electronic Control System
of Engine
226
S/N
Step
Check
result
Subsequent
step
Yes
Repair or replace
the harness
3
Check if the circuit of power supply side of engine malfunction lamp
is open or short
to ground.
No
Next step
Yes
Repair or replace
the harness
4
Check if the circuit connecting pin of engine malfunction lamp
control side to Pin 23# of ECU is open or short to power source or
ground.
No
Next step
Y
es
Diagnosi
s
help
5
Check
if
the
bulb
of
engine
malfunction
lamp
operates
normally.
No
Replace the bu
lb
II.
Diagnosis
by
Trouble Phenomena
1. Instruction
Before carrying out the trouble diagnosis steps with the engine trouble phenomenon, it is necessary to
firstly conduct the preliminary check:
1) Confirm that
the
malfunction indicator lamp
of
engine operates normally.
2)
Check
with trouble
diagnoses apparatus
to
confirm that
there
is
no
trouble information
record.
3)
Confirm existence of
the trouble
complain from
owner and
the conditions
about the
occurrence of
the trouble.
And then check the appearance:
1)
Check
fuel
pipes
for
leakage.
2)
Check
vacuum
pipes
for breakage
or
kink
and
proper connection.
3) Check intake
pipes
for
blockage,
leakage, flatness or damage.
4) Check
high-voltage
wire of
ignition syste
m for brok
en, aging,
verify correc
t ignition
sequenc
e.
5) Check grounding
position
of wire
harness
for c
lean
and
firm.
6) Check
the connector
of each
sensor and actuator for the looseness
or poor
contact.
Attention
:
If
any
of
above-mention
ed
phenomen
a
exists,
firstly
conduct
maintenance
operation
against it; otherwise the following trouble diagnosis and maintenance will be
affected.
2.
Diagnosis
Help
1) Confirm that
there
is
no
trouble record
related to engine.
2)
Confirm the
existence
of
the
trouble complained
by
the
owner.
3)
The c
heck has
been
done
with steps
above, and
there is
nothing unusual found.
4) It is not
permitted to neglect the
effects of the maintenance
of vehicle, cylinder pressure,
mechanical ignition timing and fuel etc. on the system during the Repair process.
5)
Replace
the
ECM
to
test.
If the trouble phenomenon can be cleared at this time, it means the trouble site is at ECM; if the trouble

JAC J2 Specifications

General

Brand	JAC
Model	J2
Category	Automobile
Language	English