Great Wall GW491QE, Руководство по обслуживанию

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EF.1-45
9. Despite of a normal starting process, the idle-speed when under partial load eg
：
air-conditioner is unstable or even flameout.
S.N. Operation steps
Check
result
Follow-up steps
Yes
Wash relevant parts and
components.
1
After a removal of idle-speed adjustor, check whether any carbon deposit is
produced on the throttle valve unit and the idle-speed adjustor, or inside the
idle-speed bypass air duct.
No Next step.
Yes
Continue to proceed until
step 4.
2
Observe whether the engine output power has been increased when the
air-conditioner is activated, in another word, that's to observe the change of
ignition lead-angle, oil-injection pulse width, and air inlet capacity using a
diagnosis instrument applicable to the electronic injection system.
No Next step.
Yes Next step.
3
After a line disconnection of Pin 75 on electronic control unit, check whether
the signal for accumulator jar is high on wire-harness end while the
air-conditioner is running.
No
Check and repair the
air-conditioner system.
Yes Next step.
4
Check whether the pressure within air-conditioner system, the electromagnetic
clutch of compressor, and the air-conditioner compressor are under a normal
condition.
No
Check and repair the
air-conditioner system.
Yes
Change the failed
components.
5
Following a removal of oil injector, use a special washing analyzer instrument
to check whether the oil injector has any leakage, has been blocked, or its flow
is out of tolerance.
No Next step.
Yes Diagnosis help.
6
Open the ignition switch to check whether respective power supply to Pin 12,
13, 44, 45, 63 is under a normal condition; and whether respective metal part
overlapped on Pin 3, 51, 53, 61, 80 is under a normal condition.
No
Check and repair relevant
loops.
10
．
The starting is normal yet the idle-speed is too high.
S.N. Operation steps
Check
result
Follow-up steps
Yes Adjust it.
1 Check whether the pulling line to gas is too tight or has got stuck.
No Next step.
Yes
Check and repair the air
inlet system.
2
Check whether there’s any air leakage with air inlet system, and its connected
vacuum pipes.
No Next step.
Yes
Wash relevant parts and
components.
3
After a removal of idle-speed adjustor, check whether any carbon deposit is
produced on the throttle valve unit and the idle-speed adjustor, or inside the
idle-speed bypass air duct.
No Next step.
Yes
Check and repair relevant
loops or change the
sensor.
4
After pulling out the plug of cooling-fluid temperature sensor, start the engine
and observe whether its idle-speed is too high.
No Next step.
Yes Next step.
5
Check whether the timing of engine ignition conforms to relevant
specifications.
No
Check and repair the
ignition system.
Yes Diagnosis help.
6
Open the ignition switch to check whether respective power supply to Pin 12,
13, 44, 45, 63 is under a normal condition; and whether respective metal part
overlapped on Pin 3, 51, 53, 61, 80 is under a normal condition.
No
Check and repair relevant
loops.
11
．
The rotating-speed is unable to go up or even flameout when accelerating.
S.N. Operation steps
Check
result
Follow-up steps
Yes
Check and repair the air
inlet system.
1 Check whether the air filter has been blocked.
No Next step.
Yes Next step.
2
After the connection with fuel manometer (the connection point is on the front
end of oil inlet pipe included in the fuel distributing pipe assembly), check
whether the fuel pressure keeps at about 260 kpa while engine is running at
idle-speed; and whether the fuel pressure keeps at about 300kpa after vacuum
pipe has been pulled away from the fuel pressure adjustor.
No
Check and repair the oil
supply system.
Yes Next step.
3
Check and observe whether the model and clearance of spark plug on each
cylinder is in compliance with the specification.
No Adjust or change it
Yes
Wash relevant parts and
components.
4
After a removal of idle-speed adjustor, check whether any carbon deposit is
produced on the throttle valve unit and the idle-speed adjustor, or inside the
idle-speed bypass air duct.
No Next step.
United Electronic engine management system-Genaral troubes hooting and steps
to engine
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