Great Wall GW491QE, Руководство по обслуживанию

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EF.2-17
Delphi฀engine฀management฀systm-Determination฀on฀the
principal฀/utility฀/failure฀of฀key฀system฀parts
E C U
5 V
Ground
16.฀Ignition฀coil
(c)Characteristics฀of฀product
-R ange ฀An฀opening฀degree฀within฀7% 93%
-฀Working฀voltage (5
0.1)V
-Throttle฀valve฀close ฀12%฀of฀reference฀voltage฀ 5%
-T hrottle฀full฀opened 83% 93%
-A B ฀impedance ฀12k
-Working฀temperature฀ (-40 150)
(a)Function฀&principal:
The฀ignition฀coil฀assembly฀includes฀two฀groups฀of฀coil,฀each฀is฀able฀to
provide฀ignition฀energy฀to฀two฀cylinder฀spark฀plugs฀which฀have฀360฀degree
difference฀in฀rotating฀angle฀on฀crankshaft.฀When฀piston฀moves฀to฀the฀upper
compression฀/exhaust฀stop฀point,฀the฀ignition฀will฀be฀made฀simultaneously;
Cylinder฀nearby฀the฀upper฀exhaust฀stop฀point฀has฀a฀lower฀internal฀air
pressure฀yet฀a฀higher฀temperature,฀a฀small฀amount฀of฀energy฀could฀make฀the
electrode฀of฀spark฀plug฀through฀an฀ignition,฀that’s฀so฀called฀excessive฀ignition;
Cylinder฀nearby฀the฀upper฀compression฀stop฀point฀has฀gas฀mixture฀which
is฀with฀higher฀density฀and฀pressure,฀and฀a฀greater฀amount฀of฀energy฀is
needed฀for฀the฀ignition฀of฀cylinder฀spark฀plug,฀and฀the฀gas฀mixture฀will฀be
rapidly฀ignited฀to฀do฀work,฀the฀ignition฀for฀this฀cylinder฀is฀called฀valid
ignition
-Wiring฀terminal(ITMS6฀drive฀the฀cylinder฀A-2-3;B+12V฀drive฀the฀cylinder
C-1-4.
wiring฀terminal(MT20U฀drive฀the฀cylinder฀A-2-3;B+12V฀drive฀the฀cylinder
C-1-4.
-฀Installation,฀It’s฀installed฀inside฀the฀engine฀chamber฀and฀remember฀to฀make
shielding฀against฀radio฀interference.
(b)Failure฀determination:
Important฀note Either฀of฀following฀determinations฀may฀beconcluded
based฀on฀that฀the฀whole฀vehicle,฀its฀wire-harness,฀andother฀system฀parts
&components฀are฀normal฀in฀function.
-Any฀failure฀on฀ingnition฀coil฀and฀loops฀maybo฀determined฀by฀cheking฀the
(c)Characteristics฀of฀product
฀ITMS-6฀฀ ฀฀MT20U
Primary฀resistance
Secondary฀resistance
Range฀of฀voltage฀use
Primary฀charge฀time
ms฀ mS
Peak฀value฀of฀primary฀power-cut฀current ฀฀฀฀฀
Secondary฀output฀voltage
Min.฀zener฀energy
mJ mJ
Min.฀ignition฀lasting฀time mS mS
Tightening฀moment ฀฀฀฀฀฀฀฀฀฀฀฀฀
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