Great Wall GW491QE, Руководство по обслуживанию

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EF.1-40
S.N. Operation steps
Check
result
Follow-up steps
Yes Next step.
6
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 11
Yes 10
7
Check whether the oil injector is working in a normal way after it’s been
provided with a 12V voltage by accumulator via special connector.
No Next step.
Yes Next step.
8
Re-check whether the oil injector is working in a normal way after it’s been
washed.
No Change the oil injector
Yes Change the fuel
9 Check whether fuel contains water or has deteriorated.
No 16
Yes Next step.
10 Check whether the fuel pressure is below 250kpa.
No 15
Yes Next step.
11
When the valve on fuel meter is closed before a re-connection with ignition
switch to drive the fuel pump working for another three seconds, check
whether it’s able to produce an oil pressure.
No 14
Yes
Change the fuel pressure
adjustor
12
When the valve to fuel meter is opened, clamp the oil return pipe tightly using
pliers to prevent oil return, and check whether it’s able to produce oil pressure
rapidly.
No
Repair or change the oil
injector or oil pipe.
Yes
Repair or change the oil
inlet pipe
13 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
14 Check whether the oil return pipe has been bent or blocked.
No
Change the fuel pressure
adjustor
Yes Next step.
15
Check whether data read from the absolute-pressure sensor the air-inlet
temperature sensor of inlet manifold are normal.
No Change the sensor
Yes Next step.
16
Check whether spark plug, high-voltage line, and ignition coil are under a
normal condition.
No Change or adjust it.
Yes
Check air-conditioner
system
17 Check whether the failure is caused by air-conditioner system.
No
Change ECU
14
．
Failure with the air-conditioner system
S.N. Operation steps
Check
result
Follow-up steps
Yes Repair it.
1
Check whether system has been provided with sufficient refrigerant, and
whether the air-conditioner, air-conditioner clutch, and pressure switch are
under a normal condition.
No Next step.
Yes Next step.
2
Have the engine running at idle-speed, and connect the air-conditioner switch;
And a fault diagnosis instrument may be used to check whether there’s any
failure with the air-conditioner thermal resistor.
No
Repair or change the
throttle valve
Yes
Clear away the displayed
failure.
3
After the connection of air-conditioner switch, measure whether the Pin 40 and
41
air-conditioner switch of ECU has any signal input.
No Next step.
Yes Next step.
4
If the vehicle is under a control of low electrical level, check whether the
air-conditioner unit is still working after it is closed.
No
Repair or change the
wiring harness
Yes Next step.
5
Check whether the Pin 22 (connecting the ground end of holding coil of
air-conditioner relay) of ECU has a low electrical level output.
No Check and repair it.
*The signal of low /high electrical level from Pin 41 may be regarded as an air-conditioner request signal by ECU: ECU is able to
recognize the signal of low electrical level from Pin 41 as an air-conditioner signal requested by vehicle, and the signal from Pin 41
shall be of high electrical level when A/C switch is OFF. And vice versa.
United Electronic engine management system-Genaral troubes hooting and steps
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