Great Wall GW491QE, Руководство по обслуживанию

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EF.2-16
idle฀control฀valve
throttle฀body
(a)Function฀&principal:
The฀function฀of฀idle-speed฀control฀valve฀is฀to฀control฀theflow฀area฀of
bypass฀air฀duct฀on฀throttle฀valve,฀adjust฀the฀air฀inlet฀amount฀inside฀engine,
and฀control฀the฀engine฀idle฀speed.฀The฀main฀body฀of฀idle-speed฀control
valve฀is฀one฀step฀motor;฀The฀head฀forward฀/backward฀movement฀and฀its
extent฀of฀idle-speed฀control฀valve฀may฀be฀controlled฀by฀ECM฀via฀digital
square-wavesignal;
-Wiring฀terminal฀:A฀--฀coilB-,฀B฀--฀coil฀B+,฀C฀--฀coil฀A-,฀D฀--coil฀A+;
-Installation:฀Two฀Delphi฀designated฀screws฀shall฀be฀used฀to฀fix฀฀฀the฀idle-
speed฀control฀valve฀onto฀a฀throttle฀valve฀unit.
(b)Failure฀determination:
Important฀note:
฀Either฀of฀following฀determinations฀may฀be฀concluded
based฀on฀that฀the฀whole฀vehicle,its฀wire-harness,฀and฀other฀system฀parts
&฀compnentsare฀normal฀in฀function;
-The฀action฀of฀idle-speed฀valve฀maybe฀controlled฀by฀a฀Diagnosis฀Instrument;
Observe฀the฀response฀of฀idle-speed฀control฀valve฀,฀and฀the฀status฀of฀engine;
-Read฀out฀the฀failure฀diagnosed฀by฀system;
-A฀regular฀wash฀is฀needed฀as฀the฀idlespeed฀valve฀hole฀might฀be฀blocked฀by
fuel฀sludge;
-An฀error฀connection฀between฀the฀wiring฀terminal฀of฀idlespeed฀valve฀and
ECM฀wiring฀terminal฀via฀wire-harness.
฀฀฀฀฀฀15.฀Throttle฀position฀sensor฀(TPS)(MT20U)
(a)Function฀ &principal
T hrottle฀position฀sensor฀has฀the฀same฀structure฀as฀linearly฀variable฀resistor,
and฀its฀sliding฀terminals฀are฀driven฀by฀throttle฀shaft;฀A฀different฀opening฀degree
of฀throttle฀will฀result฀in฀a฀different฀response฀of฀resistance฀signal฀from฀its฀sensor
to฀ECU.฀Depending฀on฀the฀output฀signal฀value฀and฀its฀change฀rate,฀system฀may
determine฀the฀real฀load฀on฀engine,฀and฀the฀dynamical฀change฀status:฀wiring
terminal:฀A -+5V,฀B -signal฀ground,฀C-฀throttle฀position฀signal.฀Installation
Throttle฀position฀sensor฀is฀installed฀on฀the฀throttle฀valve฀assembly,฀and฀shares
one฀same฀shaft฀with฀accelerator฀rod฀and฀throttle฀valve.
(b)F ailur e฀ deter mination
T he฀opening฀degree฀of฀throttle฀valve฀read฀from฀a฀Diagnosis฀Instrument฀shall
vary฀within฀0%-99.6%;฀And฀the฀impedance฀between฀terminal฀Aand฀C฀shall฀be
within฀(3-12)k
;฀Measure฀the฀change฀of฀resistance฀for฀A- C ฀ or฀ C -B ,฀ and฀ it
shall฀be฀smooth฀andfree฀from฀stagnancy.
Delphi฀engine฀management฀systm-Determination฀on฀the
principal฀/utility฀/failure฀of฀key฀system฀parts
(c)Characteristics฀of฀product
-Coil฀resistance 53 ฀ 10
-Coil฀inductance:฀33mH฀ 20
-Working฀voltage (7.5 12)V
-L imit฀voltage (3.5 14)V
14.฀Idle฀speed฀control฀valve
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