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Chery A11. Manual - part 165

Maintenance Manual for Chery·Windcloud

Marelli EFI System

Replace

fuel

pressure

regulator

Yes

Go to next step

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

No Replace

ECU

Yes Replace

coolant

temperature sensor

Pull out coolant temperature sensor to see if
engine is in working order.

Go to next step

Yes

Go to next step

Check if cylinder compression pressure of
engine is normal.

No Troubleshooting
Yes

Go to next step

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

No Replace
Yes Replace

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

Go to next step

Yes Replace

ECU

Check if spark plug is in good order..

Replace spark plug

Maintenance Manual for Chery·Windcloud

Marelli EFI System

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

Yes Eliminate

failure

displayed

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

Go to next step

Yes

Go to next step

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.

Examine and repair
air conditioner circuit

Yes

Go to next step

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

Repair or replace

Yes

Go to next step

Set ignition switch in “ON”. Check if the
voltages of ECU’s 57#, 58#, 64#, and 65# pins
(output to idle speed stepper motor) are normal.

Check control circuit

Yes Repair/replace

stepper motor

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

Go to next step

Yes Replace

ECU

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.

Replace idle speed
actuator

Maintenance Manual for Chery·Windcloud

Marelli EFI System

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

Yes Eliminate

failure

displayed

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

Go to next step

Yes

Go to next step

Check if air filter is smooth.

No Replace
Yes

Go to next step

Make engine run at idle speed, and check to see if
intake pressure is between 35-55kPa.

No Examine

and

repair

air intake and air
leakage

Yes

Go to step 7

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

Go to next step

Yes

Go to next step

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 57#, 58#,
64#, and 65# pins (output to idle speed actuator)
are in good order.

No Repair

replace

wire harness

Yes

Go to next step

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

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

Go to next step

Yes Replace

fuel

Check if fuel is deteriorated or contains water.

Go to next step

Yes

Go to next step

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

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

No Replace

Yes Replace

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

Go to next step

Yes Replace

ECU

Check if spark plug is in good order.

Replace spark plug

Maintenance Manual for Chery·Windcloud

Marelli EFI System

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

Yes Eliminate

failure

displayed

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

Go to next step

Yes

Adjust or replace

Check if cable connecting with accelerator pedal
is stuck or over-tightened or idle adjusting screw
shifts.

Go to next step

Yes

Repair or replace

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

Go to next step

Yes

Go to next step

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.

Go to step 6

Yes Repair

replace

vacuum booster

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

Go to next step

Yes

Replace PVC valve

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

Go to next step

Yes Replace

carbon

canister control
valve

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

Go to next step

Yes

Repair or replace

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

Go to next step

Yes

Repair or replace

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

Go to next step

Yes

Go to next step

Check if injector seal ring is in good condition.

Replace seal ring

Yes Replace

ECU

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

sensor

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