Chery A11. Manual — part 164
Maintenance Manual for Chery·Windcloud
Marelli EFI System
6). Instable idle speed occurs anytime
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 Repair
or
replace
idle speed actuator
2
Check if idle speed actuator of idle speed stepper
motor is stuck (in case binding occurs in idle
speed stepper motor, this failure can not be read
from scanner, neither does it have failure code).
No
Go to next step
Yes
Check wire harness
and socket
connector
3
Switch on the ignition switch, and check if the
connections between water temperature sensor,
idle speed stepper motor and ECU are in good
condition.
No
Go to next step
Yes
Go to step 8
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
Check the injector working condition of each
cylinder to see if it is in good order.
No
Check injector and
wire harness
Yes
Go to next step
6
Check to see if the high voltage line resistance of
each cylinder is in good order.
No Replace
Yes Replace
7
Check if ignition coil is damaged.
No
Go to next step
Yes
Go to next step
8
Check if spark plug is in good order.
No
Replace spark plug
Yes
Go to next step
9
Connect fuel pressure gauge valve. Strap the 30#
and 87# pins of pump relay to make fuel pump
work, and then check if fuel pressure is at about
350kPa.
No
Go to step 13
Yes
Go to step 12
10
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
11
Recheck injector to see if it is working in good
order after cleaning.
No Replace
injector
Yes Replace
fuel
12
Check if fuel is deteriorated or conatians water.
No
Go to step 18
Yes
Go to next step
13
Check if fuel pressure is lower than 350kPa.
No
Go to step 17
Yes
Go to next step
14
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 16
15
Turn on fuel guage valve, clamp fuel return pipe
with fuel return interceptor to ensure no fuel
Yes Replace fuel
pressure regulator
44
Maintenance Manual for Chery·Windcloud
Marelli EFI System
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 return pipe
16
Check if leakage or clogging occurs in fuel inlet
pipe.
No
Replace fuel pump
Yes Repair
or
replace
fuel return pipe
17
Check if fuel return pipe is blocked up or bent.
No Replace
fuel
pressure regulator
Yes Clean
up
18
Check if sensing hole of intake manifold pressure
and intake air temperature sensor is blocked up.
No
Go to next step
Yes
Go to next step
19
Make engine run at idle speed, when coolant
temperature reaches the point where closed-loop
control is activated, check to see if oxygen sensor
is in working order. (Fluctuating between
100-900mV).
No Check
oxygen
sensor and wire
harness
Yes Eliminate
leakage
20
Check if leakage occurs in engine intake system.
No
Go to next step
Yes
Go to next step
21
Check if cylinder pressure of engine is normal.
No Troubleshooting
Yes Replace
ECU
22
Make engine runat idle speed, and check to see if
ignition advance angle is normal after coolant
temperature reaches normal value.
No Check
others
45
Maintenance Manual for Chery·Windcloud
Marelli EFI System
7). Idle speed is instable during warming-up
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 manifold pressure is between 35-55kPa
during warming-up.
No Eliminate
intake
system air leakage
failure
Yes
Go to next step
4
Shut down the engine and switch on ignition
switch, and then connect commutator between
ECU and wire harness to check the voltages of
intake air temperature and water temperature
sensor as well as ECU’s 54#, 62# pins (served as
4.5-5V sensor power) to see if they are in good
order.
No Overhaul
Yes
Go to next step
5
Pull out idle speed actuator connector before
completion of warming-up to see if engine speed
changes (ECU-controlled fan rotates continuously)
No Replace
idle
speed
actuator
Yes
Go to next step
6
Check if coolant temperature sensor is in good
working order:
3 k ohm± 5% at 25°C
No Replace
Yes Replace
ECU
7
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
46
Maintenance Manual for Chery·Windcloud
Marelli EFI System
8). Idle speed is instable after the completion of warming-up
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
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
pins and ECU output to idle speed actuator pins
are in good order.
No
Repair or replace
wire harness and
relevant parts
Yes
Go to next step
3
Shut down the engine and check if air filter is
smooth.
No Replace
Yes
Go to next step
4
Check if intake manifold pressure is between
35-55kPa when idling (when idling, the intake
pressure of old and new camshafts of A11
series varies from each other).
No Eliminate
intake
system air leakage
failure
Yes
Go to next step
5
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 9
Yes
Go to step 8
6
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 Replace
7
Recheck injector to see if it is working in good
order after cleaning.
No Replace
injector
Yes Replace
fuel
8
Check if fuel is deteriorated or contains water.
No
Go to step 14
Yes
Go to next step
9
Check if fuel pressure is lower than 350kPa.
No
Go to step 13
Yes
Go to next step
10
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 12
Yes Replace
fuel
pressure
regulator
11
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
12
Check if leakage or clogging occurs in fuel inlet
pipe.
No
Replace fuel pump
13
Check if fuel return pipe is blocked up or bent.
Yes
Repair or replace fuel
return pipe
47
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