Great Wall GW491QE, Руководство по обслуживанию

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EF.2-12
Delphi฀engine฀management฀systm-Determination฀on฀the
principal฀/utility฀/failure฀of฀key฀system฀parts
5.฀Manifold฀pressure฀/temperature฀sensor M A P/M AT
฀ ฀฀(a)Function฀&principal
฀฀฀฀The฀pressure฀sensor฀for฀inlet฀manifold฀shall฀be฀installed฀together฀with฀the
฀฀฀฀฀inlet฀temperature฀sensor฀for฀an฀easy฀use฀and฀installation.฀And฀the฀function
฀ ฀ ฀ of฀ the฀ integrated฀ unit฀ is฀ thesame฀ as฀ that฀ of฀ each฀ separated฀ unit.
-Wiring฀terminal A -pressure฀signal,฀B -+5V ,฀C-฀temperature฀signal,
฀฀฀฀D-signal฀ground
-Installation T hey฀shall฀be฀installed฀on฀the฀gas฀duct฀of฀four฀cylinders
฀฀฀฀for฀inlet฀manifold,฀and฀may฀be฀used฀to฀determine฀specific฀cylinder฀by
฀฀฀฀manifold฀pressure.
฀฀฀-Technique฀“cylinder฀determination฀by฀pressure” When฀the฀engine
฀฀฀cylinder฀is฀working฀on฀an฀inlet฀stroke,฀a฀sudden฀opening฀of฀inlet฀door
฀฀฀will฀make฀the฀manifold฀pressurenearby฀air฀valve฀decreased฀sharply฀by
฀฀฀approx฀1kPa,฀whichwill฀be฀ detected฀by฀the฀inlet฀pressure฀sensor;and
฀ ฀ ฀ this฀ signal(highpass฀ filtering)฀ shall฀ be฀ separated฀ and฀ processed฀ by
฀฀฀E CUthrough฀software.฀In฀such฀way,฀the฀determination฀on฀cylindermay
฀฀฀฀be฀effected.
฀ ฀ (b)F ailur e฀ deter mination
฀฀฀I mpor tant฀note
E ither฀of฀following฀determinations฀may฀be฀concluded
฀฀ ฀based฀on฀ that฀the฀ whole฀ vehicle,฀its฀ wire฀harness,฀and฀ other฀ system
฀฀฀parts฀& components฀are฀normal฀in฀function.
฀฀฀-T he฀pressure฀/temperature฀value฀may฀be฀read฀out฀using฀฀a฀Diagnosis
฀฀฀Instrument,฀and฀shall฀be฀consistent฀to฀the฀actual฀value
฀฀฀-Damageoncomponentswithregardtoitsinternalperformance;
(c)Characteristics฀of฀product:
Characteristics฀of฀pressure฀sensor
฀฀฀฀฀฀฀฀฀฀฀฀฀Pressure฀(kPa)฀฀฀฀฀฀฀Output฀voltage฀(V)
Characteristics฀of฀temperature฀sensor
Working฀voltage 5 V฀ DC
Working฀temperature฀ (-40 135)
6.฀Engine฀rotating-speedsensorcrankshaftpositionsensor
(a)Function฀ &principal
B eing฀one฀ type฀of฀magnetoelectric฀ sensor,฀the฀ engine฀rotating-speed
sensor฀ /crankshaft฀ position฀ sensor฀ shall฀ be฀ installed฀ nearby฀ the
crankshaft,฀ and฀ shall฀ work฀with฀ 58x฀gear฀ring฀ on฀ crankshaft.฀ W hen
crankshaft฀ is฀ rotating,฀ 58X ฀ gear฀ top฀ /groove฀ will฀ pass฀ the฀ sensor
successively฀yet฀with฀different฀distance฀to฀sensor,฀and฀the฀sensor฀may
feel฀the฀A C฀changes฀of฀ magnetic฀reluctance,฀which฀results฀in฀ an฀A C
changed฀output฀signal.฀Using฀this฀signal,฀E CU฀is฀able฀to฀determine฀the
rotati ng฀ posi ti on฀ & speed฀ of ฀ crank shaf t. ฀ W i ri ng฀ termi nal :
A ฀-฀,฀B -signal฀-,฀C-shielded฀layer.฀Installation T hey฀shall฀be
installed฀nearby฀the฀crankshaft.
(b)Failure฀ determination
I mpor tant฀note
E ither฀of฀following฀determinations฀may฀be฀concluded฀based฀on฀that฀the฀whole฀vehicle,฀its฀wire-harness,฀and
other฀system฀parts฀& components฀are฀normal฀in฀function.
-Failures฀having฀been฀diagnosed฀by฀system฀will฀be฀read฀out฀through฀a฀Diagnosis฀Instrument.
-Shielded฀wire฀has฀not฀been฀applied฀to฀the฀signal฀in฀wire-harness,฀or฀the฀ shielding฀layer฀of฀shielded฀wire฀has฀not฀ been฀well
connected฀to฀ground
-The฀magnetic฀core฀has฀absorbed฀a฀larger฀quantity฀of฀metal฀dusts;
-The฀distance฀between฀sensor฀and฀gear฀ring฀is฀beyond฀limit;
-The฀relative฀position฀of฀gear฀ring฀to฀the฀crankshaft฀is฀incorrect฀or฀a฀displacement฀is฀produced
(c)C har acter istics฀of฀pr oduct
-฀Working฀temperature฀ (-40 165)
-฀Working฀clearance (0.25 1.75)mm
-฀Output 400฀mV @ 60฀ r/min
-฀Coil฀resistance
-฀Coil฀inductance
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