Chery A11. Manual — part 165
Maintenance Manual for Chery·Windcloud
Marelli EFI System
No
Replace
fuel
pressure
regulator
Yes
Go to next step
14
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
15
Pull out coolant temperature sensor to see if
engine is in working order.
No
Go to next step
Yes
Go to next step
16
Check if cylinder compression pressure of
engine is normal.
No Troubleshooting
Yes
Go to next step
17
Check to see if the high voltage line resistance
of each cylinder is in good order.
No Replace
Yes Replace
18
Check if ignition coil and high voltage line are
damaged or have crack.
No
Go to next step
Yes Replace
ECU
19
Check if spark plug is in good order..
No
Replace spark plug
48
Maintenance Manual for Chery·Windcloud
Marelli 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 57#, 58#, 64#, and 65# pins
(output to idle speed stepper motor) 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.
No
Replace idle speed
actuator
49
Maintenance Manual for Chery·Windcloud
Marelli 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 35-55kPa.
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 57#, 58#,
64#, and 65# 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
50
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
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 or idle adjusting screw
shifts.
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
51
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