Chery A15. Manual - part 48

 

 

voltage cable have any damaged parts or 
cracks. 

No 

Proceed to next step. 

Yes 

Replace the ECU. 

12 

Verify that the spark plug is normal. 

No 

Replace the spark plug. 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

G-80

 

12) Too high idle speed (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 

Adjust or replace. 

2 

Verify that the fastener connected to the 
accelerator pedal is jammed or too tight. 

No 

Proceed to next step.

Yes 

Repair or replace. 

3 

Verify that the carbon canister control valve, 
the fuel pressure regulator, the crankcase 
forced ventilation vacuum pipe, the brake 
system vacuum booster hose are assembled 
well or damaged. 

No 

Proceed to next step.

Yes 

Proceed to next step.

4 

Run the engine at idle speed, shift at neutral 
position, and step on the brake pedal in order 
to verify that the idle speed is too high. 

No 

Proceed to Step 6 

Yes 

Repair or replace the 

vacuum booster. 

5 

Clamp the vacuum booster hose to verify 
whether the idle speed is normal. 

No 

Proceed to next step.

Yes 

Replace the PVC 

valve 

6 

Clamp the crankcase forced ventilation 
vacuum pipe to verify whether the idle speed 
is changed to normal. 

No 

Proceed to next step.

Yes 

Replace the carbon 

canister control 

valve. 

7 

Clamp the carbon canister control valve hose 
to verify whether the idle speed is changed 
to normal. 

No 

Proceed to next step.

Yes 

Repair or replace. 

8 

Verify that the idle actuator is inflexible or 
jammed. 

No 

Proceed to next step.

Yes 

Repair or replace. 

9 

Verify that there is any leakage at other 
places of air inlet pipe. 

No 

Proceed to next step.

Yes 

Proceed to next step.

10 

Verify that the seal ring of fuel injector is in 
good condition. 

No 

Replace the seal 

ring. 

Yes 

Replace the ECU. 

11 

Verify that the absolute pressure sensor of 
air intake manifold and air intake 
temperature sensor are in proper conditions. 

No 

Replace the sensor. 

 

 

 

 

 

 

 

G-81

 

13) Malfunction to increase the speed or stall during acceleration 

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 

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 intake pressure is 
maintained between 35-65 kPa at idle 
speed. 

No Overhaul 

Yes 

Proceed to next step. 

5 

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 

Proceed to next step. 

6 

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 10 

Yes 

Proceed to Step 9 

7 

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. 

8 

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

No 

Replace the fuel 

injector. 

Yes 

Replace the fuel. 

9 

Verify that the fuel is deteriorated or 
contaminated with water. 

No 

Proceed to Step 15. 

Yes 

Proceed to next step. 

10 

Verify that the fuel pressure is lower than 
250kPa. 

No 

Proceed to Step 14. 

Yes 

Proceed to next step. 

11 

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 13. 

Yes 

Replace the fuel 

pressure regulator. 

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. 

12 

 

G-82

 

Yes 

Repair or replace the 

fuel air inlet pipe. 

13 

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

No 

Replace the fuel pump. 

Yes 

Repair or replace the 

fuel return pipe. 

14 

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

No 

Replace the fuel 

pressure regulator. 

Yes 

Proceed to next step. 

15 

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 the throttle position 
sensor, and pins of 32# and 33# (used as 
sensor’s power supply of 4.5-5V) are 
normal. 

No 

Repair or replace the 

wiring harness. 

Yes 

Replace the ECU. 

16 

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

No 

Repair the relevant 

parts. 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

G-83