Chery A11. Manual — part 186

Maintenance Manual for Chery · Windcloud

M7.9.7 EFI System

9). Idle speed unsteadiness or flameout when using load (air conditioner, etc.)

Yes Eliminate

failure

displayed

1

Set ignition switch in “ON”. Check with scanner
to see if there is failure information record.

No

Go to next step

Yes

Go to next step

2

Turn on air conditioning switch, connect
commutator between ECU and wire harness,
and then measure to see if there is signal input
on air conditioning switch and pressure signal of
ECU.

No

Examine and repair
air conditioner circuit

Yes

Go to next step

3

Check if pressure of air conditioning system,
electromagnetic clutch of compressor and air
conditioning pump are in good order.

No

Repair or replace

Yes

Go to next step

4

Set ignition switch in “ON”. Check if the
voltages of ECU’s 65#, 64#, 67#, and 66# pins
(output to idle speed actuator) are normal.

No

Check control circuit

Yes Repair/replace

stepper motor

5

Disassemble stepper motor to see if it is stuck in
operation.

No

Go to next step

Yes Replace

ECU

6

Start engine, turn on air conditioner, and check
with scanner with reference to step number of
stepper motor to see if idle speed actuator is in
working order (normal number of steps to be
provided later).

No

Replace idle speed
actuator

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Maintenance Manual for Chery · Windcloud

M7.9.7 EFI System

10). Periodical unsteadiness (ECU shall have self-learning again after power cutoff)

Yes Eliminate

failure

displayed

1

Set ignition switch in “ON”. Check with scanner
to see if there is failure information record.

No

Go to next step

Yes

Go to next step

2

Check if air filter is smooth.

No Replace
Yes

Go to next step

3

Make engine run at idle speed, and check to see if
intake pressure is between 35-65kPa.

No Examine

and

repair

air intake and air
leakage

Yes

Go to step 7

4

Make engine run at idle speed, and stall cylinders
one by one to see if engine speed declines or
fluctuates.

No

Go to next step

Yes

Go to next step

5

Set ignition switch in “ON”. Connect commutator
between ECU and wire harness, and then check to
see if the voltages of ECU’s intake manifold
absolute pressure sensor output, intake air
temperature sensor output, coolant temperature
sensor output, oxygen sensor output, electronic
ground, ignition switch pins as well as 65#, 64#,
67#, and 66# pins (output to idle speed actuator)
are in good order.

No Repair

or

replace

wire harness

Yes

Go to next step

6

Make engine run at idle speed, and check to see if
ignition advance angle is normal after coolant
temperature reaches normal value.

No Check

others

Yes Clean

up

7

Check if sensing hole of intake manifold pressure
and intake air temperature sensor is blocked up.

No

Go to next step

Yes Replace

fuel

8

Check if fuel is deteriorated or contains water.

No

Go to next step

Yes

Go to next step

9

Provide 12V voltage directly from accumulator to
injector with special connector, and check if
injector is working in good order.

No Examine

and

repair

injector and
corresponding wire
harnesses

Yes

Go to next step

10

Check to see if the high voltage line resistance of
each cylinder is in good order.

No Replace

Yes Replace

11

Check if ignition coil and high voltage line are
damaged or have crack.

No

Go to next step

Yes Replace

ECU

12

Check if spark plug is in good order.

No

Replace spark plug

53

Maintenance Manual for Chery · Windcloud

M7.9.7 EFI System

11). Excessive idle speed (ECU shall have self-learning again after power cutoff)

Yes Eliminate

failure

displayed

1

Set ignition switch in “ON”. Check with scanner
to see if there is failure information record.

No

Go to next step

Yes

Adjust or replace

2

Check if cable connecting with accelerator pedal
is stuck or over-tightened.

No

Go to next step

Yes

Repair or replace

3

Check if carbon canister control valve, fuel
pressure regulator, positive crankcase ventilation
vacuum tube, brake system vacuum booster tube
are safely installed or damaged.

No

Go to next step

Yes

Go to next step

4

Make engine run at idle speed, and place it in
neutral position, step down on the brake pedal to
see if idling speed is too high.

No

Go to step 6

Yes Repair

or

replace

vacuum booster

5

Clamp vacuum booster tube to see if idling speed
turns normal.

No

Go to next step

Yes

Replace PVC valve

6

Clamp positive crankcase ventilation vacuum tube
to see if idle speed turns to normal.

No

Go to next step

Yes Replace

carbon

canister control
valve

7

Clamp tube of carbon canister control valve to see
if idling speed turns to normal.

No

Go to next step

Yes

Repair or replace

8

Check to see if idling speed actuator is dumb or
stuck.

No

Go to next step

Yes

Repair or replace

9

Check somewhere else of air intake pipe to see if
leakage occurs.

No

Go to next step

Yes

Go to next step

10

Check if injector seal ring is in good condition.

No

Replace seal ring

Yes Replace

ECU

11

Check if intake manifold absolute pressure and
intake air temperature sensor is in good condition. No Replace

sensor

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Maintenance Manual for Chery · Windcloud

M7.9.7 EFI System

12). Low rotating speed or engine flameout during acceleration

Yes Eliminate

failure

displayed

1

Set ignition switch in “ON”. Check with scanner
to see if there is failure information record.

No

Go to next step

Yes

Go to next step

2

Check if air filter is smooth.

No Replace
Yes

Go to next step

3

Make engine run at idle speed, and check to see
if rotating speed is normal when idling.

No

Refer to entry of
idle speed failure
for repair

Yes

Go to next step

4

Make engine run at idle speed, and check to see
if intake pressure is between 35-65kPa.

No Overhaul
Yes

Go to next step

5

Make engine run at idle speed, and check to see
if ignition advance angle is normal after coolant
temperature reaches normal value.

No Adjust

ignition

advance angle

Yes

Go to next step

6

Connect fuel pressure gauge valve. Strap the
30# and 87# pins of fuel pump relay to make
fuel pump work, and then check if fuel pressure
is at about 350kPa.

No

Go to step 10

Yes

Go to step 9

7

Provide 12V voltage directly from accumulator
to injector with special connector, and check if
injector is working in good order.

No

Go to next step

Yes

Go to next step

8

Recheck injector to see if it is working in good
order after cleaning.

No Replace

injector

Yes Replace

fuel

9

Check if fuel is deteriorated or contains water.

No

Go to step 15

Yes

Go to next step

10

Check if fuel pressure is lower than 250kPa

No

Go to step 14

Yes

Go to next step

11

Shut down fuel gauge valve. Switch on ignition
switch again to make fuel pump work once
more, and check if fuel pressure is established.

No

Go to step 13

Yes Replace

fuel

pressure regulator

12

Turn on fuel guage valve, clamp fuel return pipe
with fuel return interceptor to ensure no fuel
return, and check if fuel pressure is formed
rapidly.

No Repair/

replace

injector or fuel
pipe

Yes

Repair or replace
fuel inlet pipe

13

Check if leakage or clogging occurs in fuel inlet
pipe

No

Replace fuel pump

Yes

Repair or replace
fuel return pipe

14

Check if fuel return pipe is blocked up or bent.

No Replace

fuel

pressure regulator

55