Great Wall GW491QE, Руководство по обслуживанию

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EF.2-28
Precautions฀to฀the฀use฀/service฀/troubleshooting฀of฀electrical฀injection฀system
(g)Reversed฀logic฀thinking฀method
-Think฀in฀a฀reversed฀way฀what฀symptom฀might฀be฀against฀a฀certain฀failure฀with฀component;
-Accumulate฀and฀make฀a฀conclusion฀from฀symptoms฀which฀are฀produced฀when฀components฀are฀damaged฀or฀fail฀to฀help฀quickly
find฀out฀the฀failure฀point.
(h)Flow฀diagram฀analysis฀method
-Applicable฀to฀complicated฀failures
-Perform฀operations฀as฀per฀the฀given฀flow฀diagram฀to฀find฀out฀the฀failure฀point;
-Other฀methods฀may฀be฀applicable฀during฀operation฀to฀assist฀in฀the฀analysis฀and฀determination.
2.฀Module-like฀solutions฀to฀failure
Module-like฀solutions฀to฀failure฀is฀one฀kind฀of฀method฀to฀check฀the฀failures฀by฀optimum฀priority,฀which฀is฀divided฀into:฀whole฀vehicle
inspection฀module,฀fuel฀supply฀system฀module,฀ignition฀system฀module,฀air฀inlet฀system฀module air฀exhaust฀system฀module,฀and
component฀diagnostic฀module.฀And฀the฀inspection฀on฀these฀modules฀may฀help฀to฀basically฀fix฀the฀failure฀point฀caused฀by฀the
electrical-injection฀system.
(a)Whole฀vehicle฀inspection฀module
฀฀฀฀Step฀I cooling฀vehicle
The฀engine฀keeps฀still฀(for฀about฀30฀seconds)฀when฀the฀key฀switch฀is฀turned฀to฀a฀position ON ;
Test฀item฀฀฀฀฀฀฀฀฀฀฀฀฀฀฀฀฀฀฀฀฀฀฀฀฀฀฀฀฀฀฀฀฀฀฀฀฀฀฀฀฀฀฀฀฀฀฀฀฀฀฀฀฀฀฀฀฀฀System฀status฀and฀Limit฀value
1)฀฀Display฀of฀fault฀code None
2)฀฀Engine฀fault฀indicator฀light On
3)฀฀Accumulator฀jar฀voltage (11.5฀~฀13)V
4)฀฀Coolant฀temperature฀sensor normal฀temperature
5)฀฀Inlet฀temperature฀sensor ambient฀temperature
6)฀Absolute-pressure฀sensor฀for฀inlet฀manifold ambient฀atmosphere฀(For฀plain฀area:฀about฀100kPa)
7)฀฀Work฀range฀of฀throttle฀position฀sensor (0฀~฀99.6)%
8)฀฀Oxygen฀sensor <฀200฀mV฀(heating฀type) (฀450฀ ฀10)฀mV(non-heating฀type)
9)฀฀Idle-speed฀control฀valve (40฀~฀159)฀steps฀(step)
Step฀II Idle-speed฀check฀(Preheat฀the฀engine฀to฀a฀normal฀water฀temperature฀after฀it’s฀starting฀)—at฀low฀idle฀speed
Test฀item ฀฀฀฀฀฀฀฀฀฀฀฀฀฀฀฀฀฀฀฀฀฀฀฀฀฀฀฀฀฀฀฀฀฀฀฀฀฀฀฀฀฀฀฀฀฀System฀status฀and฀Limit฀value
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)฀฀Rotating฀speed Typical฀idle฀speed฀ 30฀r/min
฀฀(when฀fan,฀headlight,฀and฀air฀blow฀unit฀are฀starting) Typical฀idle฀speed+50฀ ฀30฀r/min
6)฀฀Ignition฀lead-angle (5฀~฀13)
7)฀฀Pressure฀of฀inlet฀manifold (35฀~฀55฀)kPa
8)฀฀Actual฀position฀of฀idle-speed฀motor (15฀~฀30)฀steps
9)฀฀Oil-injection฀pulse฀width (2฀~฀4)฀mS
10)฀฀Jump฀of฀oxygen฀sensor/ten฀seconds ฀6฀times
Step฀III Idle-speed฀check฀(Preheat฀the฀engine฀to฀a฀normal฀water฀temperature฀after฀it’s฀starting฀)฀—at฀high฀idle฀speed
Test฀item฀฀฀฀฀฀฀฀฀฀฀฀฀฀฀฀฀฀฀฀฀฀฀฀฀฀฀฀฀฀฀฀฀฀฀฀฀฀฀฀฀฀฀฀฀฀฀฀฀฀฀฀฀฀฀System฀status฀and฀Limit฀valu e
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)฀฀Rotating฀speed actual฀value
[controlled฀within฀(2000฀ ฀50)฀r/min]
6)฀฀Ignition฀lead-angle (20฀~฀30)
7)฀฀Oil-injection฀pulse฀width (2฀~฀4)฀mS
8)฀฀Jumps฀of฀oxygen฀sensor฀/10฀seconds 10฀times
Step฀IV:฀฀Driving฀inspection
Driving฀inspection฀includes:฀an฀inspection฀on฀the฀failure฀of฀oxygen฀sensor฀when฀the฀opening฀degree฀of฀throttle฀is฀above฀10 ฀and
lasting฀for฀at฀least฀15฀seconds;฀and฀an฀inspection฀on฀the฀failure฀of฀the฀vehicle฀speed฀sensor฀when฀the฀vehicle฀speed฀reaches฀80฀km/
h฀at฀a฀direct฀gear฀shift,฀and฀when฀it฀slides฀for฀at฀least฀5฀seconds฀after฀the฀throttle฀valve฀is฀closed.
Test฀item฀฀฀฀฀฀฀฀฀฀฀฀฀฀฀฀฀฀฀฀฀฀฀฀฀฀฀฀฀฀฀฀฀฀฀฀฀฀฀฀฀฀฀฀฀฀฀฀฀฀฀฀฀฀฀฀฀฀System฀status฀and฀Limit฀value
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