JAC J2 User Manual



Maintenance Manual for J2 Sedan
Electronic Control System
of Engine
178
■
During
inspection
of fuel
pressur
e, always
to mak
e sure
whether
there
is fuel
leakage
in fu
el
pipeline.
7)
If the me
asured
fuel press
ure is
more t
han the
standard
value, a
nalyze
the possib
le rea
sons referri
ng
the following table and repair as required.
Fuel System Trouble Diagnosis Table 1
Phenomenon Possible Cause T
roubleshooting
Blockage
of fuel filter
Replace
the fuel filter
Too low fuel pressure
Damaged fuel pump or poor sealing of fuel
pressure
regulator resulting in fuel leakage at returning side
Replace fuel pump
Cementation
of
fuel
pressure
Replace
fuel
pump
Too high fuel pressure
Blockage or bend of fuel return pipe
Repair or replace fuel
pipe
8) Turn off engine
and check t
he changes of fuel pressure ga
uge reading for 5min. If the readi
ng drops,
observe the reduction rate. Referring to following table to analyze and eliminate the trouble.
Fuel System Trouble Diagnosis Table 2
Phenomenon
Possible
Cause
T
roubleshooting
Fuel pressure drops slowly after engine
stopped
Leakage
of
fuel
injector
Replace
injector
Fuel pressure drops completely after engine
stopped.
Trouble
of
fuel
pump
Replace
pump
9)
Reduce
the
pressure
in
fuel
pipeline.
10)
Disconnect the
fuel pressure gauge
and install
the inspection
port nut.
11) Check for fuel leakage
with
followin
g
steps.
①
 Turn the ignition switch to
the "ON"
position (with engine stopped), and
then check for leakage at
the joint of the fuel pipeline.
②
 Start the engine and
increase speed,
inspect whether there is leakage at
joint of
fuel system.

JAC J2 Specifications

General

Brand	JAC
Model	J2
Category	Automobile
Language	English