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