Great Wall GW491QE, Service Manual

Page: 46 / 222

EF.1-27
Performance฀data
Value
Measurement
Min. Typical Max.
Unit
Nominal voltage
Primary windings R esistance Value
20 25
Secondary windings
Primary windings Inductance value
20 25 Secondary windings
L oad 50pF
Formed voltage
L oad 50pF//1M
฀(a)Function฀
- Control฀the฀fuel฀injection
- Control฀the฀ignition
- Control฀the฀idle-speed
- Provide฀the฀sensor฀with฀power฀supply฀5V/120mA
- Integrated฀knock฀control฀by฀cylinder,฀with฀self-adaptability;
- E ฀closed-loop฀control,฀with฀self-adaptability;
- Control฀the฀carbon-canister฀valve
฀฀฀฀-฀฀฀฀Air-conditioner฀switch
- Engine฀fault฀indicator฀lamp
- Software฀switch฀to฀increase฀the฀density฀of฀injected฀oil
- Modification฀to฀the฀fix฀quantify฀of฀fuel
- Output฀of฀engine฀rotating-speed฀signal TN฀signal
- Input฀of฀vehicle฀speed฀signal
- Diagnosis฀of฀the฀failure฀on฀driving฀stage฀and฀sensor
- Control฀the฀carbon-canister฀valve
- Receive฀signal฀from฀the฀engine฀rotating-speed฀sensor
- Receive฀the฀engine฀load฀signal,฀etc.
16.฀Electronic฀controller฀ECU(M1.5.4)
(b)Power฀supply Refer฀to฀the฀circuit฀diagram฀for฀UAES฀M1.5.4฀system
-Uninterrupted฀power฀supply฀by฀accumulator฀via฀Pin฀18;
-Power฀supply฀via฀Pin฀37฀when฀main฀relay฀has฀been฀connected;
-Power฀supply฀via฀Pin฀27฀when฀ignition฀switch฀has฀been฀connected;
(c)฀Ground:
Pin฀2,฀10,฀14,฀19,฀24,฀30,฀48.
Failure฀diagnosis฀interface
Includes฀Pin฀55฀and฀engine฀data฀line฀K.฀Using฀line฀K,฀the฀record฀of฀failure฀information฀inside฀ECU฀may฀be฀called฀out,฀or฀some
commands฀may฀be฀manually฀input,฀such฀as:฀elimination฀of฀the฀record฀of฀failure฀information,฀self-learning฀of฀idle-speed฀actuator,etc.
(d)฀Increased฀density฀of฀gas฀mixture฀at฀after-sale฀stage:
Pin฀8฀and฀52฀are฀mainly฀applicable฀to฀some฀cases฀whereby฀the฀degradation฀of฀engine฀starting฀performance฀is฀caused฀by฀the฀aging฀of
internal฀parts฀&components฀or฀the฀individual฀difference.
(e)฀ Symptom
Unstable฀idle-speed,฀bad฀acceleration,฀unable฀to฀start,฀much฀high฀idle-speed,฀tail฀gas฀out฀of฀limit,฀start฀with฀difficulty,฀air-conditioner
failed,฀the฀oil฀injector฀control฀failed,฀flameout,฀etc.
(f)฀Cause฀of฀general฀failures
-The฀electrical฀overload฀on฀peripheral฀device฀results฀in฀a฀burning฀and฀failure฀of฀parts฀and฀components฀inside฀ECU;
-The฀rust฀and฀corrosion฀on฀circuit฀board฀are฀caused฀by฀water฀inside฀ECU.
United฀Electronic฀engine฀management฀system-Analysis฀of฀function฀/principal฀/
failure฀for฀system฀parts฀&components
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