Great Wall GW491QE, Руководство по обслуживанию

Страница: 52 / 222

EF.1-33
S.N. Operation steps
Check
result
Follow-up steps
Yes Next step.
12 Check whether the fuel pressure is below 250kpa.
No 16
Yes Next step.
13
Close the fuel manometer valve, and re-connect the ignition switch to have oil
pump working for three seconds, then check whether an oil pressure will be
produced.
No 15
Yes
Change the fuel pressure
adjustor
14
Open the fuel manometer valve, and clamp the oil return pipe using oil-return
barrier to prevent oil from returning, then check whether an oil pressure will be
produced.
No
Repair or change the oil
pipe or injector.
Yes
Repair or change oil inlet
pipe
15 Check whether the oil inlet pipe has leakage or has been blocked.
No Change the oil pump
Yes
Repair or change oil
return pipe
16 Check whether the oil inlet pipe has leakage or has been bent.
No
Change the fuel pressure
adjustor
Yes Next step.
17 Check whether the pressure of engine cylinder is normal.
No Clear the failure away.
Yes Repair it.
18 Check whether the engine air-inlet system has leakage.
No Next step.
Yes Repair or change it
19
Check whether the absolute pressure /temperature sensor of inlet manifold has
been blocked.
No Change the ECU
5
．
The idle-speed at any time is unstable.
S.N. Operation steps
Check
result
Follow-up steps
Yes
Clear the displayed failure
away.
1
Place ignition switch to the ON
”
position. A fault diagnosis instrument may be
used to check whether there’s any record of failure information.
No
Next step.
Yes
Repair or change the
idle-speed actuator
2 Check whether the idle-speed actuator has got stuck.
No
Next step.
Yes
Check the wiring harness
and socket connector.
3
After the connection of ignition switch, connect a commutator between ECU
and wiring harness, and check whether respective voltage on Pin 14 &45(the
signal output end for air-inlet temperature sensor and cooling-fluid temperature
sensor respectively) of ECU is normal, and whether respective voltage on Pin 4
&26 (used as one signal output end for idle-speed actuator) of ECU is normal.
No
Next step.
Yes 8
4
Have the engine running at idle-speed, and have the cylinder flameout one by
one to observe whether the engine rotating-speed has been decreased or has
fluctuation.
No Next step.
Yes Next step.
5 Check whether the oil injector for each cylinder is under a normal condition.
No
Check the oil injector and
wiring harness.
Yes Next step.
6
Check whether the resistance value exact value to be found in the chapter for
ignition system of high-voltage line inside each cylinder is normal.
No
Check the oil injector and
wiring harness.
Yes
Next step.
7 Check whether the spark plug is normal.
No
Change the spark plug
Yes
Next step.
8
Connect the fuel manometer valve. And have the Pin 30 of fuel pump relay
short-circuit connected with the Pin 87, and check whether the fuel pressure is
within 250kpa and 300kpa while the fuel pump is working.
No
13
Yes 12
9
Check whether the oil injector is able to work in a normal way after it has been
provided with a 12V voltage by accumulator via special connector.
No Next step.
United Electronic engine management system-Genaral troubes hooting and steps
to engine
ProCarManuals.com