Chery A18. Manual — part 22
2) The engine can run but cannot successfully start up during starting
Item
No.
Operation procedure
Inspection
results
Follow-up procedure
Yes
Fix the indicated
malfunction
1
Turn the ignition switch to “ON” position.
Inspect with the diagnostic tester to see
whether there is any malfunction information
record.
No
Proceed to next step.
Yes
Proceed to Step 8.
2
Disconnect the cylinder distribution wire and
connect it to the spark plugs, make a space of
5-10mm between the grid of the spark plug
and engine body. Then turn on the engine
with starting motor, verify that there is any
bluish-white high-voltage spark.
No
Proceed to next step.
Yes
Proceed to next step.
3
Verify that the resistance of the high voltage
cable is normal
No
Repair or replace high
voltage cable
Yes
Replace
4
Verify that the cylinder-distribution high
voltage cable and spark plug have any
damage.
No
Proceed to next step.
Yes
Replace
5
Verify that the cylinder identification rotor
ring in distributor is loose or damaged.
No
Proceed to next step.
Yes
Proceed to next step.
6
Verify that the ignition coil is normal
No
Replace
Yes
Proceed to next step.
7
Verify that the plug in connector of the
camshaft is properly connected.
No
Connect the connector
properly
Yes
Proceed to next step.
8
Turn the ignition switch to “ON” position.
Verify that the fuel pump relay and fuel
pump is functional.
No
Service the fuel pump
circuit
Yes
Proceed to next step.
9
Connect it to the fuel manometer valve.
Make the 30# and 87# pins of fuel pump
relay short so as to operate the fuel pump,
and then verify that the fuel pressure is
maintained at about 350kPa.
No
Proceed to Step 13.
Yes
Proceed to Step 12.
10
Pull out the fuel distributing pipe together
with the fuel injector and disconnect the fuel
injector connectors on the wiring harness one
by one. Connect a 12V supply directly from
the battery to the fuel injector and verify that
the fuel injector is functioning.
No
Proceed to next step.
Yes
Proceed to next step.
11
After washing and cleaning the fuel injector,
verify that it is capable of injecting fuel
again.
No
Replace the fuel
injector
Yes
Replace the fuel
12
Verify that the fuel is deteriorated or
contaminated by water.
No
Proceed to Step 18.
Yes
Proceed to next step.
13
Verify that the fuel pressure is lower than
350kPa.
No
Proceed to Step 17.
Yes
Proceed to next step.
14
Close the fuel manometer valve. Connect the
ignition switch again to re-operate the fuel
pump in order to verify that the fuel pressure
can be established.
No
Proceed to Step 16.
Yes
Replace fuel and
pressure regulator
15
Open the fuel manometer valve and clamp
the fuel return pipe with the fuel tube clamp
to stop the fuel return in order to verify that
the fuel pressure can be established quickly.
No
Repair or replace the
fuel injector or fuel
pipe
Yes
Repair or replace the
fuel inlet pipe
16
Verify that the fuel inlet pipe has any
leakage or blockage.
No
Replace the fuel pump
Yes
Repair or replace the
fuel return pipe
17
Verify that the fuel return pipe has any
leakage or bending.
No
Replace the fuel
pressure regulator
Yes
Proceed to next step.
18
Connect an adapter between ECU and the
wiring harness. Then verify that there is any
voltage at the ECU’s pin No.44, 45, 63, 12
and 13, and to see whether the positive
power supply wires connected to the above
ECU’s pins and the ground wires connected
to the pin No. 3, 51, 53, 61 and 80 are
normal.
No
Repair or replace the
wiring harness.
Yes
Repair
19
Verify that the parts of air intake system
have any air leakage.
No
Proceed to next step.
Yes
Repair or replace
20
Verify that the absolute pressure and
temperature sensor of air intake manifold has
any blockage.
No
Proceed to next step.
Yes
Proceed to next step.
21
Verify that the coolant temperature sensor is
normal.
No
Repair or replace
Yes
Fix the mechanical
malfunction
22
Verify that the unsuccessful startup is due to
mechanical reasons such as excessive
clearance between the piston and cylinder or
due to cylinder air leakage, etc.
No
Replace the ECU
3) Difficult start-up of hot engine
Item
No.
Operation procedure
Inspection
results
Follow-up
procedure
Yes
Fix the indicated
malfunction
1
Turn the ignition switch to “ON” position.
Inspect with the diagnostic tester to see
whether
there
is
any
malfunction
information record.
No
Proceed to next
step.
Yes
Proceed to next
step.
2
Connect the fuel manometer valve. Short
the 30# and 87# pins of the fuel pump relay
to operate the fuel pump in order to verify
that the fuel pressure is maintained at about
350kPa.
No
Proceed to Step 9.
Yes
Proceed to next
step.
3
Disconnect the connecting fuel pipe and
turn off the ignition switch. After 1 hour,
verify that the pressure of fuel system is
maintained between 250-300 kPa.
No
Repair the leakage
of fuel system
Yes
Replace the fuel
pressure regulator
4
Connect the connecting fuel pipe and block
the fuel return pipe with the fuel tube clamp
as well as close the fuel manometer valve.
Then turn off the ignition switch, after 1
hour, verify that the pressure of fuel system
is maintained between 250-300 kPa.
No
Proceed to next
step.
Yes
Replace the fuel
injector and fuel
pipe
5
Verify that the fuel injector and fuel pipe
have any fuel leakages.
No
Proceed to next
step.
Yes
Inspect the coolant
temperature and
circuit
6
Disconnect
the
connector
of
water
temperature sensor to start up the engine.
Observe whether it can successfully start up.
No
Proceed to next
step.
Yes
Proceed to next
step.
7
Put adaptor between ECU and wiring
harness. Then verify that there is any
voltage at the ECU’s 44#, 45#, 63#, 12# and
13# pins and to see whether the positive
power wires connected to the above ECU’s
pins and the ground wire connected to the
pins of 3#, 51#, 53#, 61# and 80# are
normal.
No
Repair or replace
the wiring harness
Yes
End
No
Replace the ECU
8
Replace the fuel and try the hot start again.
Observe whether it can successfully start up.
No
Repair or replace
Yes
Proceed to next
step.
9
Verify that the fuel pipe has any blockage or
bending and to see whether the pressure
regulating valve functions of fuel pump is
normally.
No
Repair or replace
Yes
Proceed to next
step.
10
Inspect with multimeter to see whether there
is a voltage between two terminals of the
plug in connector of fuel pump.
No
Repair or replace
fuel pump relay
and wire
Yes
Proceed to next
step.
11
Inspect with multimeter to see whether the
resistance of fuel pump is correct.
No
Replace the fuel
pump
Yes
Replace the fuel
pump
12
Verify that the fuel pump is jammed.
No
Replace the ECU
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