Chery A15. Manual - part 47

 

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Chery A15. Manual - part 47

 

 

 

9) Unstable idle speed after engine warm-up 

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 

Turn the ignition switch to “ON” position 
and connect the adaptor between ECU and 
the wiring harness. Verify that the 
voltages at following ECU’s pins such as 
absolute pressure sensor output of air 
intake manifold, air intake temperature 
sensor output, coolant temperature sensor 
output, oxygen sensor output and ECU’s 
output voltage connected to idle actuator’s 
pin are normal. 

No 

Repair or replace the 

wiring harness and 

relevant parts. 

Yes 

Proceed to next step. 

3 

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

No Replace 

Yes 

Proceed to next step. 

4 

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 

Proceed to next step. 

5 

Connect the fuel manometer valve (the 
connecting points will depend on the types 
of car models). 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 

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

No 

Proceed to next step. 

Yes Replace 

7 

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

No 

Replace the fuel 

injector. 

Yes 

Replace the fuel. 

8 

Verify that the fuel is deteriorated or 
contaminated with 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 

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 12. 

11 

Turn on the fuel manometer valve and 
clamp the fuel return pipe with the fuel 

Yes 

Replace the fuel 

pressure regulator. 

 

G-76

 

 

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 air inlet pipe. 

12 

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

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 

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

No 

Adjust the ignition 

advance angle. 

Yes 

Replace the coolant 

temperature sensor. 

15 

Disconnect the coolant temperature sensor 
to verify that the engine is normal. 

No 

Proceed to next step. 

Yes 

Proceed to next step. 

16 

Verify that the compression pressure of 
engine cylinder is normal. 

No 

Fix the malfunction. 

Yes 

Proceed to next step. 

17 

Verify that the resistance of each cylinder 
high voltage cable is normal. 

No Replace 

Yes Replace 

18 

Verify that the ignition coil and high 
voltage cable have any damage parts or 
cracks. 

No 

Proceed to next step. 

Yes 

Replace the ECU. 

19 

Verify that the spark plug is normal. 

No 

Replace the spark plug.

 

 

 

 

 

 

 

 

 

 

 

 

 

G-77

 

10) A/C system malfunction 

Yes 

Proceed to next step.

1 

Verify that there is enough refrigerant and 
the A/C belt, A/C clutch and pressure switch 
are in good condition. 

No 

Fix the malfunction.

Yes 

Fix the indicated 

malfunction. 

2 

Run the engine at idle speed and turn on the 
A/C switch. Inspect with the diagnostic 
tester to see whether there is any 
malfunction with the A/C thermo-sensitive 
resistance. 

No 

Proceed to next step.

Yes 

Proceed to next step.

3 

Turn on the A/C switch and connect the 
adaptor between ECU and the wiring 
harness. Measure and see whether the 
ECU’s A/C switch and A/C pressure have 
any signal input. 

No 

Inspect the wiring 

harness. 

Yes 

Replace the bulb or 

repair the wiring 

harness. 

4 

If the car is controlled by low electrical 
level, verify that the A/C still functions 
when it is turned off. 

No 

Proceed to next step.

Yes 

Repair the A/C relay 

and the wiring 

harness. 

5 

Verify that there is any low level output 
from the ground terminal of A/C relay 
solenoid coil in ECU. 

No 

Replace the ECU. 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

G-78

 

11) Periodically instability (the memory has to be restored after ECU’s 
power-off) 

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 

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

No 

Overhaul air intake 

system and leakage. 

Yes 

Proceed to Step 7 

4 

Run the engine at idle speed and cut off 
the cylinder one by one in order to verify 
that the speed is decreased and fluctuated. 

No 

Proceed to next step. 

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 ECU’s pins 
including absolute pressure sensor output 
of air intake manifold, air intake 
temperature sensor output, coolant 
temperature sensor output, oxygen sensor 
output, electronic grounding, ignition 
switch pin, and ECU’s pins of 65#, 64#, 
67#, and 66# (output connected to idle 
actuator) are normal. 

No 

Repair or replace the 

wiring harness. 

Yes 

Proceed to next step. 

6 

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

No 

Inspect other items. 

Yes Clean 

7 

Verify that the sensing holes of air intake 
manifold pressure sensor and air intake 
temperature sensor have any blockage. 

No 

Proceed to next step. 

Yes 

Replace the fuel. 

8 

Verify that the fuel is deteriorated or 
contaminated with water. 

No 

Proceed to next step. 

Yes 

Proceed to next step. 

9 

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 

Overhaul the fuel 

injector and relevant 

wiring harness. 

Yes 

Proceed to next step. 

10 

Verify that the resistance of each cylinder 
high voltage cable is normal. 

No Replace 

11 

Verify that the ignition coil and high  Yes 

Replace 

 

G-79

 

 

 

 

 

 

 

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