Great Wall GW491QE, Руководство по обслуживанию

Страница: 54 / 222

EF.1-35
7
．
The idle-speed is unstable after the vehicle heating process is ended.
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 Next step.
2
Place ignition switch on the ON
”
position, connect a commutator between
ECU and wiring harness, and check whether respective voltage on the Pin 7
output of absolute-pressure sensor for inlet manifold , Pin 44 output of
air-inlet temperature sensor , Pin 45 output of cooling-fluid temperature
sensor , Pin 28 output of oxygen sensor , and Pin 4 &26 output to the
idle-speed actuator of ECU is normal.
No
Repair or change the
wiring harness
Yes Next step.
3 Check whether the passage of air filter is free when engine is closed.
No Change it.
Yes
Next step.
4
Check whether the pressure of inlet manifold is within 35kpa and 65kpa when
at idle-speed.
No
Settle the air leakage
within air inlet system.
Yes Next step.
5
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 9
Yes 8
6
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.
Yes
Next step.
7
Check whether the oil injector is able to work normally after it has been
washed.
No Change the oil injector
Yes Change the fuel
8 Check whether fuel contains water or has deteriorated.
No 14
Yes Next step.
9 Check whether the fuel pressure is below 250kpa.
No 13
Yes Next step.
10
Close the fuel manometer valve, and re-connect the electric spark switch to
have oil pump working for three seconds, then check whether an oil pressure
will be produced.
No 12
Yes
Change the fuel pressure
adjustor
11
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
injector or oil pipe.
Yes
Repair or change the oil
inlet pipe 12 Check whether the oil inlet pipe has any leakage or has been blocked.
No Change the oil pump
Yes
Repair or change oil
return pipe
13 Check whether the oil return pipe has been bent or blocked.
No
Change the fuel pressure
adjustor
Yes
Change the cooling-fluid
temperature sensor 14
Observe whether the engine is working normally after the cooling-fluid
temperature sensor has been pulled out.
No Next step.
Yes Next step.
15 Check whether the compressive pressure inside the engine cylinder is normal.
No Clear the failure away.
Yes Next step.
16
Check whether the resistance value about 16k
Ω
/m, exact data to be found in
the chapter for ignition system of high-voltage line inside each cylinder is
normal.
No Change it.
Yes Change the ECU
17 Check whether the spark plug is normal.
No Change the spark plug
United Electronic engine management system-Genaral troubes hooting and steps
to engine
ProCarManuals.com