Chery A15. Manual — part 49

14) Slow respond during acceleration

Yes

Fix the indicated

malfunction

1

Turn the ignition switch to “ON” position.
Verify with diagnostic tester to see
whether there is any malfunction
information record.

No

Proceed to next step.

Yes

Proceed to next step.

2

Shut down the engine and verify that the
air filter is free of any blockage.

No Replace

Yes

Proceed to next step.

3

Run the engine at idle speed in order to
verify that the idle speed is normal.

No

Overhaul according to

the idle speed

malfunction instruction

Yes

Proceed to next step.

4

Verify that the air inlet pipe pressure is
being maintained between 35-65 kPa at
idle speed.

No Overhaul

Yes

Proceed to next step.

5

Turn the ignition switch to “ON” position
and connect the adaptor between ECU and
the wiring harness. Verify that the
voltages at following pins of ECU
including signal output terminal and
grounding terminal of throttle position
sensor, and pins of 32# and 33# (used as
sensor power supply of 4.5-5V) are
normal.

No

Repair or replace the

wiring harness

Yes

Proceed to next step.

6

Operate the engine at idle speed and wait
until the coolant temperature has reached
its normal value in order to verify that the
ignition advance angle is normal.

No

Inspect other items

Yes

Proceed to next step.

7

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 11.

Yes

Proceed to Step 10.

8

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.

9

After washing and cleaning the fuel
injector, verify again to see whether it can
function normally.

No

Replace the fuel

injector.

Yes

Replace the fuel.

10

Verify that the fuel is deteriorated or
contaminated with water.

No

Proceed to Step 16.

Yes

Proceed to next step.

11

Verify that the fuel pressure is lower than
350kPa.

No

Proceed to Step 15.

G-84

Yes

Proceed to next step.

12

Turn off 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 14

Yes

Replace the pressure

regulator.

13

Turn on 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.

Yes

Repair or replace the

fuel inlet pipe.

14

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

No

Replace the fuel pump.

Yes

Repair or replace the

fuel return pipe.

15

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

No

Replace the fuel

pressure regulator.

Yes

Replace or clean.

16

Verify that the exhaust system and the
3-way catalytic converter have any
blockages.

No

Replace the ECU.

G-85

15) Poor and weak performance during acceleration

Yes Repair

1

Verify that there are any malfunctions such
as slipping of clutch, low pressure of tires,
delay in braking, and wrong size of tires or
inaccurate four-wheel alignment.

No

Proceed to next step.

Yes

Proceed to next step.

2

Verify that the throttle can be fully opened.

No

Replace or repair the

throttle

Yes

Fix the indicated

malfunction

3

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.

4

Run the engine at idle speed until the
coolant temperature reaches its normal
range in order to verify that the ignition
advance angle is normal.

No

Inspect other items.

Yes

Proceed to next step.

5

Turn the ignition switch to “ON” position
and connect the adaptor between ECU and
the wiring harness. Verify that the voltages
at following pins of ECU including absolute
pressure sensor of air intake manifold,
throttle valve position sensor, air intake
temperature sensor, coolant temperature
sensor, oxygen grounding terminal and
signal output terminal, sensor signal
grounding terminal and pins of 32# and 33#
(used as sensor power supply of 4.5-5V) are
normal.

No

Repair or replace the

wiring harness.

Yes

Proceed to next step.

6

Verify that the air intake pressure is being
maintained between 35-65 kPa at idle speed.

No Overhaul

Yes

Proceed to next step.

7

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 being maintained at
about 350kPa.

No

Proceed to Step 11.

Yes

Proceed to Step 10.

8

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.

9

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

No

Replace the fuel

injector.

10 Verify that the fuel is deteriorated or Yes

Replace the fuel.

G-86

contaminated with water.

No

Proceed to Step 16.

Yes

Proceed to next step.

11

Verify that the fuel pressure is lower than
350kPa.

No

Proceed to Step 15.

Yes

Proceed to next step.

12

Turn off 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 14.

Yes

Replace the pressure

regulator.

13

Turn on the fuel manometer valve and
clamp the fuel return pipe with the fuel tube
clamp to stop the fuel return in order to
verify and see whether the fuel pressure can
be established quickly.

No

Repair or replace the

fuel injector or the

fuel pipe.

Yes

Repair or replace the

fuel inlet pipe

14

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

No

Replace the fuel

pump.

Yes

Repair or replace the

fuel return pipe.

15

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

No

Replace the fuel

pressure regulator.

Yes

Proceed to next step.

16

Verify that the data of the absolute pressure
sensor of air intake manifold and air intake
temperature sensor are normal.

No

Replace the sensor.

Yes

Proceed to next step.

17

Verify that the ignition coil, the high voltage
cable and the spark plug are normal.

No

Replace or adjust

Yes

Inspect the A/C

system

18

Verify that it is caused by the A/C system.

No

Replace the ECU.

G-87