Chery A11. Manual — part 163

Maintenance Manual for Chery·Windcloud

Marelli EFI System

4). Rotating speed is normal, but starting is difficult all along

Step Operation

Result

Solution

Yes Eliminate

failure

displayed

1

Set ignition switch in “ON”. Check with scanner
to see if there is failure information record.

No

Go to next step

Yes

Go to next step

2

Check if air filter is smooth.

No Replace
Yes

Go to next step

3

After successful starting, check to see if intake
manifold pressure is between 35-55kPa when
idling.

No Eliminate

intake

system air leakage
failure

4

Slightly step down on throttle to see if the
starting is easy.

Yes Replace/check

throttle and idle
speed passage

Yes

Go to next step

5

Connect fuel pressure gauge valve. Strap the
30# and 87# pins of fuel pump relay to make
fuel pump work, and then check if fuel pressure
is at about 350kPa.

No

Go to step 9

Yes

Go to step 8

6

Provide 12V voltage directly from accumulator
to injector with special connector, and check if
injector is working in good order.

No

Go to next step

Yes

Go to next step

7

Recheck injector to see if it is working in good
order after cleaning.

No Replace

injector

Yes Replace

fuel

8

Replace fuel and check if fuel is deteriorated or
contains water.

No

Go to step 14

Yes

Go to next step

9

Check if fuel pressure is lower than 350kPa

No

Go to step 13

Yes

Go to next step

10

Shut down fuel gauge valve. Switch on ignition
switch again to make fuel pump work once
more, and check if fuel pressure is established.

No

Go to step 12

Yes Replace

fuel

pressure regulator

11

Turn on fuel guage valve, clamp fuel return pipe
with fuel return interceptor to ensure no fuel
return, and check if fuel pressure is formed
rapidly.

No Repair/

replace

injector or fuel pipe

Yes Repair

or

replace

fuel inlet pipe

12

Check if leakage or clogging occurs in fuel inlet
pipe.

No

Replace fuel pump

Yes Repair

or

replace

fuel return pipe

13

Check if fuel return pipe is blocked up or bent.

No Replace

fuel

pressure regulator

Yes

Go to next step

14

Pull out the idle speed stepper motor connector
on wire harness before engine coolant
temperature reaches 35℃ to see if engine speed
declines.

No Repair

or

replace

idle speed stepper
motor

Yes

Go to next step

15

Set ignition switch in “ON”. Check if the
voltages of the following pins of ECU are in
good order: if the accumulator voltage is about
12V on 15#, 29# and 47#, while 0 on 27# and
28#.

No

Check wire harness
and socket
connector

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Maintenance Manual for Chery·Windcloud

Marelli EFI System

Yes

Go to next step

16

Make engine run at idle speed, and check to see
if ignition advance angle is normal after coolant
temperature reaches normal value.

No Replace

ECU

Yes

Go to next step

17

Check if cylinder compression pressure of
engine is normal.

No Troubleshooting

Yes

Repair or replace

18

Check if intake manifold absolute pressure and
intake air temperature sensor is blocked up.

No

Go to next step

Yes Replace

ECU

19

Check if coolant temperature sensor is in good
order.

No

Repair or replace

41

Maintenance Manual for Chery·Windcloud

Marelli EFI System

5). Vehicle cold starting is difficult

Step Operation

Result

Solution

Yes Eliminate

failure

displayed

1

Set ignition switch in “ON”. Check with scanner
to see if there is failure information record.

No

Go to next step

Yes

Go to next step

2

Check with multimeter to see if coolant
temperature sensor is in good order. (Or connect
in series a 2.5K ohmic resistance between pins of
54# and 62# of ECU to replace coolant
temperature sensor and then start engine.) If
starting is OK, it shows coolant temperature
sensor is out of order.

No Replace

sensor

Yes

Go to next step

3

Switch on the ignition switch and connect
commutator between ECU and wire harness.
Check if the voltages of the following pins of
ECU are in good order: if the accumulator voltage
is about 12V on 47#, while 0 on 27# and 28#.

No

Check wire harness
and socket
connector

Yes

Go to next step

4

Check if air filter is smooth; if throttle has carbon
deposit.

No Replace

Yes

Go to next step

5

After successful starting, check to see if intake
manifold pressure is between 35-55kPa during
idling.

No Eliminate

intake

system air leakage
failure

Yes

Check throttle and
idle speed passage

6

Slightly step down on throttle to see if the starting
is easy.

No

Go to next step

Yes

Go to next step

7

Pull out the idle speed actuator connector on wire
harness before engine coolant temperature reaches
35℃ to see if engine speed declines.

No Repair

or

replace

idle speed actuator

Yes

Go to next step

8

Connect fuel pressure gauge valve. Ground
directly the 86# pin of fuel pump relay. Switch on
the ignition switch to make fuel pump relay and
fuel pump work, and then check if fuel pressure is
at about 350kPa.

No

Go to step 12

Yes

Go to step 11

9

Provide 12V voltage directly from accumulator to
injector with special connector, and check if
injector is working in good order.

No

Go to next step

Yes

Go to next step

10

Recheck injector to see if it is working in good
order after cleaning.

No Replace

injector

Yes Replace

fuel

11

Check if fuel is deteriorated or contains water.

No

Go to step 17

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Maintenance Manual for Chery·Windcloud

Marelli EFI System

Yes

Go to next step

12

Check if fuel pressure is lower than 350kPa

No

Go to step 16

Yes

Go to next step

13

Shut down fuel gauge valve. Switch on ignition
switch again to make fuel pump work once more,
and check if fuel pressure is established.

No

Go to step 15

Yes Replace fuel

pressure regulator

14

Turn on fuel guage valve, clamp fuel return pipe
with fuel return interceptor to ensure no fuel
return, and check if fuel pressure is formed
rapidly.

No Repair/

replace

injector or fuel pipe

Yes Repair

or

replace

fuel inlet pipe

15

Check if leakage or clogging occurs in fuel inlet
pipe.

No

Replace fuel pump

Yes Repair

or

replace

fuel return pipe

16

Check if fuel return pipe is blocked up or bent.

No Replace

fuel

pressure regulator

Yes

Go to next step

17

Check if cylinder pressure of engine is normal.

No Troubleshooting

Yes Repair

18

Check if leakage occurs in engine intake system.

No

Go to next step

Yes

Repair or replace

19

Check if intake manifold absolute pressure and
intake air temperature sensor is blocked up.

No Replace

ECU

43