Great Wall GW491QE, Service Manual

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EF.2-9
.฀System฀power฀supply฀and฀wire-harness
฀฀ignition
switch
Battery
FUSE฀1
FUSE฀4
FUSE฀3
FUSE฀2
IGN฀FUSE1
IGN฀FUSE2
IGN฀FUSE3
B AT T฀ FUSE4
B AT T
B AT T
I G N
CD฀GND
CD฀GND
PWR฀ GND
PWR฀ GND
PWR฀ GND
PWR฀ GND
(a)Function฀&principal System฀adopts฀a฀12V ฀DC฀power฀supply one฀current฀loop฀coming฀from฀accumulator฀jar฀and฀going฀into
system฀and฀ECU฀via฀ignition-key฀switch,฀is฀used฀as฀main฀power฀supply฀for฀system฀working,฀and฀transmits฀the฀system฀voltage฀signal
to฀ECU,฀which฀will฀modify฀the฀actuation฀from฀actuating฀mechanism;฀The฀other฀current฀loop฀goes฀directly฀into฀E CU฀via฀fuse,฀the
uninterrupted฀power฀supply฀makes฀E CU฀retain฀the฀parameters฀after฀a฀system฀self-learning,฀and฀prepare฀for฀the฀next฀starting฀process
at฀the฀moment฀for฀switching฀off฀the฀device.
(b)F ailur e฀deter mination Important฀ note E ither฀of฀following฀determinations฀may฀be฀concluded฀based฀on฀that฀the฀ whole
vehicle฀and฀other฀system฀parts฀& components฀are฀normal฀in฀function:฀Permanent฀electric฀wire฀& loop฀have฀been฀connected฀to฀ignition
switch฀by฀mistake E rror฀No.฀matching฀between฀wire-harness฀and฀terminal Steel฀part฀overlapping฀on฀E CU฀exterior฀cover฀might
cause฀signal฀deviation T he฀connection฀line฀of฀engine฀rotating-speed฀sensor฀/crankshaft฀position฀sensor฀/฀knock฀sensor฀is฀not
shielded฀ wire
2.฀E ngine฀contr ol฀module฀(E C U)
ITMS-6฀engine฀control฀module฀(E CU)
(a)฀F unction฀& pr incipal E ngine฀control฀module฀is฀one฀microprocessor฀based฀on฀a฀single-chip฀device.฀A nd฀its฀function฀is฀to
process฀ sensor฀ data฀ coming฀ from฀ different฀positions฀ of฀ vehicle,฀ to฀ determine฀ the฀ working฀status฀ of฀ engine,฀ and฀to฀ exactly
control฀ the฀ engine฀ via฀ an฀ actuator.฀A uxiliary฀ system฀ control฀ function theft-prevention฀ system;฀ fan฀ cooling฀ system air
conditioner฀system,฀etc.
Installation It฀shall฀be฀installed฀inside฀the฀driving฀cab;฀and฀better฀not฀have฀steel฀part฀overlapping฀on฀exterior฀cover.
(b)฀Per for mance฀par ameter E CU฀ has฀passed฀vibration฀test drop฀test impact฀test high฀/low฀temperature฀ test,฀etc.,฀and
may฀work฀in฀a฀normal฀way฀under฀various฀circumstances.
Storage฀ temperature฀ (-40 90)
Moisture฀sensitivity The฀design฀of฀E CU฀is฀able฀to฀ensure฀the฀normal฀working฀of฀unit฀when฀moisture฀content฀condenses฀on฀internal
components.
(c)W or k ฀humidity T he฀unit฀is฀able฀to฀ work฀normally฀when฀a฀power฀connection฀is฀made฀ at฀ambient฀temperature฀65 ,and
relative฀humidity฀95%.
Determination฀on฀the
principal฀/utility฀/failure฀of฀key฀system฀parts
(d)฀Characteristics฀of฀product
8-bit฀single-chip฀microprocessor฀with฀high฀performance
10-bit฀module฀converter
R ewritable฀128K b฀memory
8K b฀R A M฀memory
Installation฀in฀driving฀cab
Working฀temperature฀ (-40 85)
Normal฀working฀voltage (9 16)V
A bnormal฀working฀voltage (6.3 9)V
(16฀ 24)V
Over-voltage฀protection (-12V
24)V
Delphi฀engine฀management฀systm-Determination฀on฀the
principal฀/utility฀/failure฀of฀key฀system฀parts
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