Great Wall GW491QE, Руководство по обслуживанию

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EF.1-22
United฀Electronic฀engine฀management฀system-Analysis฀of฀function฀/principal฀/
failure฀for฀system฀parts฀&components
(h)฀Technical฀&characteristic฀parameter£º
Limit฀data
M easurement V alue
M in. T ypical M ax.
U nit
W ork ing temperature
M ax . contacting times of
chok e plug on step motor w ith the seat
T imes
M easurement V alue
M in. T ypical M ax.
U nit
R esistance of each coil w hen at 25
R esistance of each coil when
w ithin a scope of w ork ing temperature
I nductance of each coil w hen at 25 , 1000H z
N ormal w ork ing voltage V
P ossible work ing v oltage V
S tep length of rotor for step motor D egree
P ressure drop on two ends
w hen the bypass passage is opened
k pa
M ax . ax ial force
caused by air pressure difference
N
Characteristic฀data
(a)Function:Based฀on฀specfic฀command฀given฀by฀ECU,฀the฀injector
may฀inject฀fuel฀within฀a฀specified฀time฀limit฀to฀provide฀engine฀with
evaporated฀fuel.
(b)Principal:When฀the฀coil฀of฀injector฀is฀energized฀by฀ECU,฀a฀magnetic
field฀force฀will฀be฀produced;฀When฀the฀magnetic฀field฀force฀is฀increased
to฀a฀degree฀that฀it฀sufficient฀to฀overcome฀an฀resultant฀force฀of฀stress
from฀release฀spring,฀gravity฀force฀of฀needle฀valve,฀and฀force฀friction,฀the
needle฀valve฀will฀lift฀up฀to฀activate฀the฀oil฀injection฀process.฀The฀Max.
lift฀of฀needle฀valve฀shall฀not฀exceed฀0.1mm;฀When฀the฀pulse฀injection฀is
ended,฀needle฀valve฀will฀be฀re-closed฀by฀the฀stress฀from฀release฀spring;
(c)Installation฀position:on฀inlet฀manifold฀at฀one฀end฀close฀to฀air฀inlet
door.
(d)Symptom:฀Inferior฀idle-speed,฀bad฀acceleration,฀unable฀to฀start
start฀with฀difficulty,฀etc):
(e)Precautions฀to฀maintenance:
฀-฀The฀฀injector฀may฀have฀various฀types;฀During฀maintenance,฀Part฀No.
of฀฀injector฀to฀be฀re-installed฀shall฀be฀consistent฀to฀the฀original฀one฀as
injectors฀looking฀alike฀and฀able฀to฀be฀installed฀might฀be฀inappropriate;
฀-For฀an฀easy฀installation,฀it฀recommended฀to฀apply฀clean฀silicon-free
machine-oil฀to฀the฀surface฀of฀oring฀at฀the฀upper฀position฀where฀the฀fuel
11.฀injector฀ E V 6
1 O-ring
2.฀filter฀screen
3.฀injector฀with฀electrical฀plug
4.฀coil
5.฀spring
6.฀valve฀needle฀with฀coil฀anchorcore
7.฀valve฀seat฀with฀an฀injection-hole
฀฀฀฀plate
distributing฀pipe฀will฀be฀installed.฀Do฀not฀apply฀machine-oil฀to฀the฀inner฀part฀or฀injection฀hole฀of฀฀injector;
-฀O฀ring฀needs฀to฀be฀changed฀during฀the฀dismantle฀or฀re-installation฀of฀฀injector,฀and฀be฀careful฀not฀to฀damage฀the฀sealing฀surface฀of
injector;
-If฀the฀฀injector฀has฀two฀installation฀slots,฀the฀clamping฀piece฀shall฀be฀installed฀to฀the฀correct฀slot;฀Y ou฀may฀refer฀to฀the฀installation
position฀for฀original฀component;
-It฀strictly฀prohibited฀to฀dismantle,฀wash฀or฀change฀the฀filter฀screen;
-After฀a฀dismantle฀of฀฀injector,฀keep฀its฀seat฀clean,฀and฀prevent฀foreign฀materials฀from฀entering฀cylinder.
(f)Simple฀testing฀method:(recommended฀to฀use฀a฀special฀wash฀instrument฀applicable฀to฀฀injector฀for฀a฀regular฀washing฀purpose
after฀disconnection฀of฀joint)Have฀the฀digital฀multimeter฀adjusted฀to฀the ohm position,฀and฀connect฀two฀pens฀with฀two฀pins฀of
injector฀respectively;฀And฀the฀rated฀resistance฀when฀at฀20 ฀shall฀be฀:฀(11-17) after฀connection฀of฀joint)Start฀the฀engine฀and฀have฀it
running฀at฀idle-speed;฀Put฀your฀hand฀gently฀on฀the฀฀injector,฀you฀will฀feel฀the฀pulsation฀of฀฀injector .
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