Great Wall GW491QE, Руководство по обслуживанию

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EF.1-41
General troubleshooting and steps to engine within M7.9.7 system
1
．
During startup process, the engine is not rotating or rotating slowly.
S.N. Operation steps
Check
result
Follow-up steps
Yes Next step.
1
A multimeter may be used to check and measure whether the voltage between
two binding posts of accumulator is within
8-12 V while engine is starting.
No Change the accumulator.
Yes Next step.
2
Keep the ignition switch at the “starting” position. And a multimeter may be
used to check whether the positive binding post of starter has a voltage above
8V.
。
No
Repair or change the
wiring harness
Yes Repair or change starter
3
Check the action of starter after it is dismantled. The main focus is to check for
broken loops or whether the starter has got stuck due to bad lubrication.
No Next step.
Yes
Change with appropriate
grade of lubricating oil
4
If the failure only occurs in Winter, check whether the large resistance inside
starter is caused by an inappropriate selection of engine lubricating oil and gear
box oil.
No Next step.
Yes
Check and repair the
failure resulting from the
internal resistance of
engine.
5
Check whether the mechanical resistance inside engine is too large, or leads to
a slow or even no rotating of starter.
No Diagnosis help.
2
．
During a starting process, engine may be driven to rotate yet the starting is unsuccessful.
S.N. Operation steps
Check
result
Follow-up steps
Yes Next step.
1
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 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.
2
After a connection with diagnosis instrument within the electronic injection
system, observe the data entry “engine rotating-speed
”
; and observe whether
there’s any rotating-speed signal output while engine is starting.
No
Check and repair the loop
with rotating-speed
sensor.
Yes Next step.
3
Pull out the division line from one of cylinders before it’s connected with spark
plug, and keep the electrode of spark plug about 5mm away from engine body,
and check whether blue &white high-voltage fire is produced while the engine
is running.
No
Check and repair the
ignition system.
Yes
Settle the mechanical
failure on engine.
4
Check and observe whether the pressure inside each engine cylinder is
insufficient.
No Next step.
Yes Diagnosis help.
5.
After a connection with commutator within the electronic injection system,
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.
Operation steps
No Follow-up steps
3. The hot vehicle is starting with difficulty.
S.N. Operation steps
Check
result
Follow-up steps
Yes Next step.
1
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.
2
Pull out the division line from one of cylinders before it’s connected with spark
plug, and keep the electrode of spark plug about 5mm away from engine body,
and check whether blue &white high-voltage fire is produced while the engine
is running.
No
Check and repair the
ignition system.
Yes
Check and repair relevant
loops or change the
sensor.
3
Pull out the plug of cooling-fluid temperature sensor, and start the engine.
Observe for some time whether the engine may be started successfully.
Or a
300 ohm resistor may be serially connected at the joint of cooling-fluid
temperature sensor to substitute the sensor, then observe whether engine may
be started successfully.
。
No Next step.
Yes
Check, repair, or change
it.
4
Check whether the vacuum pipe of fuel pressure adjustor has been loosened or
is leaking air.
No Next step.
United Electronic engine management system-Genaral troubes hooting and steps
to engine
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