Chery A15. Manual — part 45

4) Difficult start-up under normal engine speed

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

Verify that the air filter is free of any
blockage.

No Replace

Yes

Proceed to next step.

3

After start up, verify that the air intake
manifold pressure is maintained between
35-65 kPa at idle speed.

No

Fix the leakage of air

intake system

4

Step on the throttle gently and observe
whether it’s easy to start up.

Yes

Replace and inspect the

throttle valve and idle

speed passage

Yes

Proceed to next step.

5

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 Step 8

6

Apply a voltage supply of 12V directly
between the battery and the fuel injector
with special connector, and verify that
the fuel injector functions normally.

No

Proceed to next step.

Yes

Proceed to next step.

7

After washing and cleaning the fuel
injector, verify that its function is
normal.

No

Replace the fuel

injector

Yes

Replace the fuel

8

Replace the fuel and verify that the fuel
is deteriorated or contaminated by water.

No

Proceed to Step 14

Yes

Proceed to next step.

9

Verify that the fuel pressure is lower
than 350kPa.

No

Proceed to Step 13

Yes

Proceed to next step.

10

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 12.

Yes

Replace fuel pressure

regulator

11

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 the fuel

pipe

12

Verify that the fuel inlet pipe has any
leakage or blockage.

Yes

Repair or replace the

fuel air inlet pipe

G-68

No

Replace the fuel pump

Yes

Repair or replace the

fuel return pipe

13

Verify that the fuel return pipe has any
leakage or bending.

No

Replace the fuel

pressure regulator

Yes

Proceed to next step.

14

Disconnect the connector of idle speed
actuator before the temperature of
engine coolant reaches 35

0

C in order to

observe whether the engine speed is
decreasing.

No

Repair or replace the

idle speed actuator

Yes

Proceed to next step.

15

Turn the ignition switch to “ON”
position. verify that the voltages at
following ECU pins are normal: 13# is
at about 12V of battery voltage; 80# and
61# are at zero.

No

Inspect the wiring

harness and plug in

connector

Yes

Proceed to next step.

16

Run the engine at idle speed; until the
coolant temperature reaches normal
value, then verify that the ignition
advance angle is normal.

No

Adjust the ignition

advance angle

Yes

Proceed to next step.

17

Verify that the compression pressure of
engine cylinder is normal.

No

Fix the malfunction

Yes

Repair or replace

18

Verify that the absolute pressure and
temperature sensor of air intake
manifold has any blockage.

No

Proceed to next step.

Yes

Replace the ECU.

19

Verify that the coolant temperature
sensor is normal.

No

Repair or replace

G-69

5) Difficult start-up of cold 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 verify that there is any
malfunction information record.

No

Proceed to next step.

Yes

Proceed to next step.

2

Inspect with multimeter to see
whether the coolant temperature
sensor is normal. (Or connect a
1.5K

Ω resistance in series with

ECU’s pin of 39# and 35# to replace
the function of the coolant
temperature sensor to start up the
engine. If the engine can be started, it
indicates that the coolant temperature
sensor is abnormal.)

No

Replace the sensor

Yes

Proceed to next step.

3

Turn the ignition switch to “ON”
position and connect the adaptor
between ECU and the wiring harness.
Verify that the voltages at following
ECU pins are normal: 13# is at about
12V of battery voltage; 80# and 61#
are at zero.

No

Inspect the wiring harness

and plug in connector

Yes

Proceed to next step.

4

Verify that the air filter is free of any
blockage.

No Replace

Yes

Proceed to next step.

5

After start up, verify that the air
intake manifold pressure is
maintained between 35-65 kPa at idle
speed.

No

Fix the leakage of air

intake system.

Yes

Inspect the throttle valve

and idle speed passage.

6

Step on the throttle gently to verify
that it is easy to be started up.

No

Proceed to next step.

Yes

Proceed to next step.

7

Disconnect the connector of idle
speed actuator before the temperature
of engine coolant reaches 35℃ in
order to observe whether the engine
speed is decreasing.

No

Repair or replace the idle

speed actuator

8

Connect the fuel manometer valve
(the connecting point will depend on

Yes

Proceed to next step.

G-70

(the connecting point will depend on
the types of car models). Ground the
86# pin of the fuel pump relay
directly. Connect the ignition switch
to operate the fuel pump relay and the
fuel pump in order to verify that the
fuel pressure is maintained at about
350kPa.

No

Proceed to Step 12

Yes

Proceed to Step 11

9

Provide a voltage supply of 12V with
special connector between the battery
and the fuel injector, and verify that
the fuel injector functions normally.

No

Proceed to next step.

Yes

Proceed to next step.

10

After washing and cleaning the fuel
injector, verify again that it can
function normally.

No

Replace the fuel injector

Yes

Replace the fuel

11

Verify that the fuel is deteriorated or
contaminated with water.

No

Proceed to Step 17.

Yes

Proceed to next step.

12

Verify that the fuel pressure is lower
than 350kPa.

No

Proceed to Step 16.

Yes

Proceed to next step.

13

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 15

Yes

Replace the fuel pressure

regulator.

14

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 fuel

injector or fuel pipe

Yes

Repair or replace the fuel

air inlet pipe

15

Verify that the fuel inlet pipe has any
leakage or blockage.

No

Replace the fuel pump

Yes

Repair or replace the fuel

return pipe

16

Verify that the fuel return pipe has
any leakage or bending.

No

Replace the fuel pressure

regulator

Yes

Proceed to next step.

17

Verify that the pressure of engine
cylinder is normal.

No

Fix the malfunction

Yes Repair

18

Verify that the engine air intake
system has any leakage.

No

Proceed to next step.

Yes

Repair or replace

19

Verify that the absolute pressure and
temperature sensor of air intake
manifold have any blockages.

No

Replace the ECU.

G-71