Chery A15. Instruction - page 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

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