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