Great Wall GW491QE, Руководство по обслуживанию

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EF.2-29
Precautions฀to฀the฀use฀/service฀/troubleshooting฀of฀electrical฀injection฀system
1)฀฀Engine฀fault฀indicator฀light ฀Off
2)฀฀Display฀of฀fault฀code None
3)฀฀Coolant฀temperature (80฀~฀94)
4)฀฀Accumulator฀jar฀voltage (13.5฀~฀14.5)฀V
5)฀฀Absolute-pressure฀sensor฀for฀inlet฀manifold 20฀kPa฀~฀atmospheric฀pressure
6)฀฀Work฀range฀of฀throttle฀position฀sensor (0฀~฀99.6)%
7)฀฀Oxygen฀sensor (50฀~฀950)฀mV
(b)฀Fuel฀supply฀system฀module
-฀A฀Diagnosis฀Instrument฀may฀be฀used฀to฀drive฀the฀fuel฀pump—observe฀the฀status฀of฀fuel฀pump฀relay฀and฀fuel฀pump.
-฀Disconnection฀of฀hose฀from฀the฀oil฀entrance฀of฀fuel-rail฀—฀drive฀the฀fuel฀pump—observe฀the฀oil฀going฀out฀of฀pump.
-฀Connection฀with฀the฀fuel฀manometer—drive฀the฀fuel฀pump—observe฀whether฀the฀pressure฀value฀is฀300KPa—The฀pressure
฀฀adjustor฀shall฀be฀changed฀when฀the฀pressure฀is฀higher฀than฀300KPa—And฀the฀fuel฀pump฀or฀pressure฀adjustor฀shall฀be฀changed
฀฀when฀the฀pressure฀is฀lower฀than฀300KP.
-฀Observe฀whether฀the฀pressure฀value฀on฀vehicle฀is฀250kPa฀(idle฀speed)—฀when฀it’s฀higher฀than฀250KP,฀check฀the฀injector.Subject฀to
above฀inspections,฀a฀basic฀determination฀may฀be฀made฀to฀judge฀whether฀each฀relevant฀component฀within฀the฀fuel฀system฀is฀working
in฀a฀normal฀way.
(c)฀Ignition฀system฀module
-฀Subject฀to฀above฀inspections,฀a฀basic฀determination฀may฀be฀made฀to฀judge฀whether฀each฀relevant฀component฀within฀the฀fuel฀฀฀system
is฀working฀in฀a฀normal฀way.฀Remove฀the฀high-tension฀wiring฀on฀cylinder฀1฀or฀4—
-฀Install฀a฀spark฀plug฀at฀the฀same฀time—drive฀the฀ignition-coil฀for฀ignition—observe฀the฀status฀of฀spark—Remove฀the฀high-฀฀tension
wiring฀on฀cylinder฀2฀or฀3—operate฀in฀the฀same฀way฀above—
-฀Make฀a฀determination฀on฀ignition-coil฀and฀relevant฀loops
-฀Subject฀to฀above฀inspections,฀a฀basic฀determination฀may฀be฀made฀to฀judge฀whether฀each฀relevant฀component฀within฀the฀fuel฀฀฀system
is฀working฀in฀a฀normal฀way.฀Take฀out฀four฀spark฀plugs—observe฀the฀status฀of฀spark-plug฀electrode—determine฀the฀฀฀working฀status
of฀each฀cylinder.
฀-฀Subject฀to฀above฀inspections,฀a฀basic฀determination฀may฀be฀made฀to฀judge฀whether฀each฀relevant฀component฀within฀the฀fuel฀฀฀system
is฀working฀in฀a฀normal฀way.฀Place฀a฀group฀of฀new฀spark฀plugs—After฀starting,฀observe฀the฀engine฀running฀at฀an฀idle฀฀฀speed—Take฀out
spark฀plug฀again฀and฀determine฀the฀working฀status฀of฀each฀cylinder.฀Subject฀to฀above฀inspections,฀a฀basic฀฀฀determination฀may฀be฀made
to฀judge฀whether฀each฀relevant฀component฀within฀the฀ignition฀system฀is฀working฀in฀a฀normal฀way.
(d)฀Air฀inlet฀system฀module
Removal฀of฀air฀filter฀on฀the฀front฀side฀of฀throttle฀valve—to฀ensure฀the฀smooth฀going฀of฀inlet฀air—observe฀the฀change฀of฀engine.
(e)฀Air฀exhaust฀system฀module
Removal฀of฀three-way฀catalytic฀converter฀—to฀ensure฀a฀smooth฀going฀of฀air฀exhaust฀system—฀observe฀the฀change฀ofengine
Based฀on฀above฀inspection,฀a฀basic฀determination฀may฀be฀made฀to฀judge฀whether฀the฀air฀exhaust฀system฀is฀working฀in฀a฀normal฀way.
(f)฀Parts฀&components฀diagnosis฀module
-฀Signal฀input฀components฀determination฀on฀each฀sensor฀may฀be฀made฀based฀on฀whether฀the฀reading฀data฀is฀in฀compliance฀with฀the
status฀of฀such฀sensor(refer฀to฀“Delphi฀engine฀management฀system-฀Delphi฀Determination฀on฀the฀principal฀/utility฀/failure฀of฀key
system฀parts”฀PEF.2-09).
-฀฀Signal฀actuator฀component—a฀Fault฀Diagnosis฀Instrument฀may฀be฀used฀to฀control฀the฀action฀of฀actuator—฀observe฀the฀action฀of
actuator.
Subject฀to฀above฀inspections,฀a฀basic฀determination฀may฀be฀made฀to฀judge฀whether฀the฀parts฀&components฀are฀working฀in฀a฀normal
way.
3.฀Solutions฀to฀common฀failures
(a)฀฀Flame-out฀when฀decelerating
฀-฀Check฀whether฀ECU฀permanent฀power฀supply฀will฀be฀cut฀off฀when฀the฀ignition฀switch฀is฀closed฀(Special฀care฀shall฀be฀given฀to
vehicles฀which฀have฀been฀installed฀with฀theft฀detector฀by฀users฀themselves.);฀and฀this฀terminal฀is฀supposed฀to฀maintain฀a฀permanent
power฀ supply
-฀Wash฀the฀throttle฀valve,฀and฀the฀step฀motor
-฀Check฀valve฀mechanism฀system฀on฀engine
Attached฀figure฀I฀and฀II฀are฀Electric-Control฀Schematic฀Diagram฀for
ITMS-฀฀6฀System.
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