Chery A15. Manual — part 44

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

G-64

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

G-65

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

G-66

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

G-67