Great Wall GW491QE, Руководство по обслуживанию

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EF.1-44
7
．
Despite of a normal starting, the idle-speed during vehicle heating process is unstable.
S.N. Operation steps
Check
result
Follow-up steps
Yes
Check and repair the air
inlet system.
1 Check the air filter for blockage, and the air inlet passage for air leakage.
No Next step.
Yes Next step.
2
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.
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 a removal of the plug for cooling-fluid temperature sensor, start the
engine and observe whether it has a stable idle-speed during vehicle heating
process.
No Next step.
Yes
Change the failed
components.
5
Remove the oil injector, and check whether it has any leakage or has been
blocked using a special washing analyzer instrument.
No Next step.
Yes
Change the fuel
6
Check the fuel condition, and observe whether the symptom is caused by the
filling with petrol.
No Next step.
Yes
Settle the mechanical
failure on engine.
7
Check the pressure inside each cylinder, and observe whether there’s any large
difference in pressure across cylinders.
No Next step.
Yes Diagnosis help.
8
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.
8
．
Despite of a normal starting process, the idle-speed is unstable after the vehicle heating process
is ended.
S.N. Operation steps
Check
result
Follow-up steps
Yes
Check and repair the air
inlet system.
1 Check the air filter for blockage, and the air inlet passage for air leakage.
No Next step.
Yes Next step.
2
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.
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 a removal of the plug for cooling-fluid temperature sensor, start the
engine and observe whether it has a stable idle-speed during vehicle heating
process.
No Next step.
Yes
Change the failed
components.
5
Remove the oil injector, and check whether it has any leakage or has been
blocked using a special washing analyzer instrument.
No Next step.
Yes Change the fuel
6
Check the fuel condition, and observe whether the symptom is caused by the
filling with petrol.
No Next step.
Yes
Settle the mechanical
failure on engine.
7
Check the pressure inside each cylinder, and observe whether there’s any large
difference in pressure across cylinders.
No Next step.
Yes Diagnosis help.
8
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.
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