Great Wall GW491QE, Service Manual

Page: 62 / 222

EF.1-43
S.N. Operation steps
Check
result
Follow-up steps
Yes
Check and repair relevant
loops or change the
sensor.
5
Pull out the plug from the cooling-fluid temperature sensor, and start the
engine; Observe whether the starting of engine proves to be a success.
No Next step.
Yes
Wash the throttle valve
and the idle-speed air duct.
6 Observe whether it’s easy to start by gently stepping on the throttle valve.
No Next step.
Yes
Change the failed
components.
7
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
8
Check the fuel condition, and observe whether the symptom is caused by the
filling with petrol.
No Next step.
Yes Eliminate engine failures.
9
Check and observe whether the pressure inside each engine cylinder is
insufficient.
No Next step.
Yes Next step.
10
Check whether the engine ignition sequence &timing conform to relevant
specifications.
No
Check and repair the
ignition timing.
Yes Diagnosis help.
11
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.
6
．
Despite of a normal starting process, the idle-speed is unstable at any time.
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 Wash or change it.
2 Check whether the idle-speed adjustor has got stuck.
No Next step.
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 it
4
Check whether any carbon deposit is produced on the throttle valve unit, or
inside the idle-speed bypass air duct.
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 and observe whether the pressure inside each engine cylinder is
insufficient.
No Next step.
Yes Next step.
8
Check whether the engine ignition sequence &timing conform to relevant
specifications.
No
Check and repair the
ignition timing.
Yes Diagnosis help.
9
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.
United Electronic engine management system-Genaral troubes hooting and steps
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