Chery A series. Manual — part 49

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

SAFETY PRECAUTIONS OF SYSTEM MAINTENANCE

SAFETY PRECAUTIONS IN DIAGNISIS AND MAINTENANCE OF THE
GASOLINE INJECTION ELECTRONIC CONTROL SYSTEM

(1) Removal/installation requirements of controller

The battery negative grid must be disconnected first, followed by the removal of
controller prior to carrying out electric welding or baking finish;

In removing/installing the controller, the ignition switch must be turned to “OFF”
position to avoid being damaged;

The power supply wire should not be removed from the battery while the engine is
running or the electrical system is in operation;

Don’t start the engine with high current of charger;

Pay attention to keep the ambient temperature around controller less than 80 .

℃

(2) Cleanliness requirements: following rules shall be complied strictly before

operating the fuel supply system and fuel injector system:

All the dismantled parts must be placed in clean environment and covered properly. It
is not allowed to use the fiber-sloughing cloth.

(3) All the wiring harness and the same for diagnostic tester can only be disconnected

or connected after the ignition switch has been turned off;

Ensure the wiring connection is correct before carrying out the voltage or grounding
measurement for the electronic control system.

Remove the power supply wire from battery or disconnect the wiring harness
controller connectors will cause the loss of diagnostic information and memory.

(4) Notes for maintaining the fuel supply system:

Attention must be paid to the followings when removing and installing the fuel pump
on a fully or semi-fully filled fuel tank:

A device that can fully absorb the potential leaked fuel should be available near the
fuel tank opening before carrying out the operation;

Avoid the skin come into direct contact with fuel;

Thoroughly clean the place and around it before loosening the connecting parts;

Put rags around the connecting parts in order to prevent the fuel from spraying via the
loosened part;

The disassembled parts that are not intended to be repaired immediately should be
covered or closed carefully;

G-88