Great Wall GW491QE, Руководство по обслуживанию

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EF.2-19
Delphi฀engine฀management฀systm-Determination฀on฀the
principal฀/utility฀/failure฀of฀key฀system฀parts
Fuel฀pump฀assembly
฀(a)Function฀&principal:
-The฀fuel฀pump฀assembly,฀whose฀main฀function฀is฀to฀provide฀system
with฀appropriate฀fuel฀amount฀to฀produce฀sufficient฀pressure,฀is฀composed
of฀fuel฀pump,฀support,฀fuel฀level฀sensor,฀and฀oil฀storage฀tank.฀And฀a
flexible฀installation฀method฀may฀be฀adopted฀to฀reduce฀direct฀influence฀on
fuel฀pump฀due฀to฀vibration;฀The฀fuel฀pump฀is฀a฀turbine฀single-step฀electrical
fuel฀pump,฀whose฀work฀will฀be฀controlled฀by฀ECM฀via฀fuel฀pump฀relay.
And฀an฀one-way฀valve฀design฀provided฀at฀the฀outlet฀of฀fuel฀pump฀is฀used
to฀ensure฀the฀re-starting฀performance฀by฀preventing฀oil฀residue฀inside
pipe฀from฀returning฀to฀oil฀tank฀while฀the฀engine฀is฀not฀working.฀And฀the
fuel฀level฀sensor฀is฀of฀a฀sliding-blade฀variable฀resistor;
-฀Wiring฀terminal฀(MT20U)฀ A-fuel฀pump฀positive,฀B-sensor฀positive,
฀฀C-sensor฀negative,฀D-fuel฀pump฀negative.
฀Wiring฀terminal฀(ITMS-6)฀ A-fuel฀pump฀positive,฀B-fuel฀pump฀฀negative.
฀-Installation:฀It฀shall฀be฀installed฀inside฀the฀fuel฀tank.
฀ (c)Characteristics฀of฀product
(b)Failure฀determination:
-฀Any฀failure฀on฀fuel฀pump฀and฀its฀related฀loops฀may฀be฀determined฀by฀driving฀the฀fuel฀pump฀relay฀to฀act฀with฀a฀Diagnosis฀Instrument
(when฀not฀driving);
-Failure฀diagnosed฀by฀the฀system฀may฀be฀read฀out฀from฀a฀Diagnosis฀Instrument;
-The฀primary฀filter฀screen฀has฀been฀blocked
-Fuel฀pump฀damaged;
-The฀sensing฀piece฀on฀fuel฀level฀sensor฀is฀broken,฀or฀the฀armed฀rod฀is฀deformed.
Fuel฀level฀sensor
Resistance฀value
Maximum฀Operating฀current
Fuel฀pump:
Output฀flow
Output฀pressure
Safe฀
decompression
Operating฀voltage
Operating฀without฀fue
over฀voltage฀protection
Items
฀
fuel฀supply
system
fuel฀ pump
assembly
line
fuel฀rail฀as-
sembly
fuel
pump
fuel฀level
฀sensor
fuel฀inlet
fuel฀filter
fuel
returnpipe
fuel฀trail
fuel฀ pressure
adjustor
injec
-tor
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