Chery A11. Manual — part 160

Maintenance Manual for Chery·Windcloud

Marelli EFI System

Check the resistance between Pin 1 and Pin 2 of
carbon canister control valve with a multimeter to
see if it is between 17.5-23.5Ω at 20℃.

No

Replace
control valve

Yes

Diagnosis
Instruction

5

Check the voltage between Pin 2 of carbon canister
control valve connector and cathode of power
supply with a multimeter to see if it is around 3.7V.

No

Go to next step

Yes

Repair or
replace wire
harness

6

Check the connection between Pin 2 of carbon
canister control valve connector and Pin 52 of ECU
to see if short circuit to ground occurs.

No

Diagnosis
Instruction

Failure: too high driver stage control circuit voltage of carbon canister

control valve

Step Operation

Result Solution

1

Connect scanner and commutator, and then turn
ignition switch to “ON”.

Go to next step

Yes

Go to Step 4

2

Unplug carbon canister control valve connector
from wire harness, check the voltage between Pin 1
of connector and cathode of power supply with a
multimeter to see if it is around 12V.

No

Go to next step

Yes

Repair or
replace wire
harness

3

Check power supply terminal wiring of carbon
canister control valve to see if open circuit or short
circuit to ground occurs.

No

Go to Step 2

Yes

Go to next step

4

Check the resistance between Pin 1 and Pin 2 of
carbon canister control valve with a multimeter to
see if it is between 22-30Ω at 20℃.

No

Replace
control valve

Yes

Diagnosis
Instruction

5

Check the voltage between Pin 2 of carbon canister
control valve connector and cathode of power
supply with a multimeter to see if it is around 3.7V.

No

Go to next step

Yes

Repair or
replace wire
harness

6

Check the connection between Pin 2 of carbon
canister control valve connector and Pin 52 of ECU
to see if short circuit occurs.

No

Diagnosis
Instruction

Failure: lower idling speed than target value

Step Operation

Result Solution

1

Connect scanner and commutator, and then turn

Go to next step

28

Maintenance Manual for Chery·Windcloud

Marelli EFI System

ignition switch to “OFF”.

Yes

Go to next step

2

Check throttle regulating screw, throttle cable and
working conditions of throttle to see if they are
normal.

No

Carry out
necessary
inspection,
repair and
maintenance

Yes

Go to next step

3

Check working conditions of idle regulator to see if
they are in good order.

No

Carry out
necessary
inspection,
repair and
maintenance

Yes

Carry out
necessary
inspection and
repair

4

A. Check fuel system pressure to see if it is too low;
B. Check injectors for blockage;
C. Check system exhaust for blockage.

No

Diagnosis
Instruction

Failure: higher idling speed than target value

Step Operation

Result Solution

1

Connect scanner and commutator, and then turn
ignition switch to “OFF”.

Go to next step

Yes

Go to next step

2

Check throttle regulating screw, throttle cable and
working conditions of throttle to see if they are
normal.

No

Carry out
necessary
inspection,
repair and
maintenance

Yes

Go to next step

3

Check working conditions of idle speed regulator to
see if they are normal.

No

Carry out
necessary
inspection,
repair and
maintenance

Yes

Carry out
necessary
inspection and
repair

4

A. Check system for air leakage;
B. Check injectors for leakage;
C. Check fuel system pressure to see if it is too

high.

No

Diagnosis
Instruction

29

Maintenance Manual for Chery·Windcloud

Marelli EFI System

Failure: too low control circuit voltage of idle speed regulator

Step Operation

Result Solution

1

Connect scanner and commutator, and then turn
ignition switch to “ON”.

Go to next step

Yes

Go to next step

2

Unplug idle speed regulator connector, check
respectively the resistances between Pin A and Pin
D, Pin B and Pin C of the regulator with a
multimeter too see if they are around 53Ω at 20℃.

No

Replace
stepper motor

Yes

Repair or
replace wire
harness

3

Check respectively the connections between Pin A,
B, C, D of idle speed regulator connector and Pin
64, 65, 57, 58 of ECU to see if short circuit to
ground occurs.

No

Diagnosis
Instruction

Failure: too high control circuit voltage of idle speed regulator

Step Operation

Result Solution

1

Connect scanner and commutator, and then turn
ignition switch to “ON”.

Go to next step

Yes

Go to next step

2

Unplug idle speed regulator connector, check
respectively the resistances between Pin A and Pin
D, Pin B and Pin C of the regulator with a
multimeter too see if they are around 53Ω at 20℃.

No

Replace
stepper motor

Yes

Repair or
replace wire
harness

3

Check respectively the connections between Pin A,
B, C, D of idle speed regulator connector and Pin
64, 65, 57, 58 of ECU to see if short circuit occurs.

No

Diagnosis
Instruction

Failure: control circuit error of idle speed regulator

Step Operation

Result Solution

1

Connect scanner and commutator, and then turn
ignition switch to “ON”.

Go to next step

Yes

Go to next step

2

Unplug idle speed regulator connector, check
respectively the resistances between Pin A and Pin
D, Pin B and Pin C of the regulator with a
multimeter too see if they are around 53Ω at 20℃.

No

Replace
stepper motor

3

Check respectively the connections between Pin A,
B, C, D of idle speed regulator connector and Pin
64, 65, 57, 58 of ECU to see if open circuit occurs.

Yes

Repair or
replace wire
harness

30

Maintenance Manual for Chery·Windcloud

Marelli EFI System

No

Diagnosis
Instruction

Failure: improper system voltage signal

Step Operation

Result Solution

1

Connect scanner and commutator, and then turn
ignition switch to “OFF”.

Go to next step

Yes

Go to next step

2

Check battery voltage with a multimeter to see if it
is around 12V.

No

Replace
battery

Yes

Repair or
replace wire
harness

3

Check respectively the connections between Pin 44,
45, 63 of ECU and Pin 87 of main relay to see if
open circuit or short circuit to ground occurs.

No

Go to next step

Yes

Go to next step

4

Start engine, check charging voltage of generator at
different engine speeds to see if it maintains within
9-16V.

No

Replace
generator

Yes

Diagnosis
Instruction

5

Check ground point of engine wire harness to see if
it is normal.

No

Repair or
replace wire
harness

Failure: too low system voltage

Step Operation

Result Solution

1

Connect scanner and commutator, and then turn
ignition switch to “OFF”.

Go to next step

Yes

Go to next step

2

Check battery voltage with a multimeter to see if it
is around 12V.

No

Replace
battery

Yes

Repair or
replace wire
harness

3

Check respectively the connections between Pin 14,
15, 29 of ECU and supply wire to see if the
resistances are too high.

No

Go to next step

Yes

Go to next step

4

Start engine, check charging voltage of generator at
different engine speeds to see if it maintains within
9-16V.

No

Replace
generator

5

Check ground point of engine wire harness to see if
it is in good condition.

Yes

Diagnosis
Instruction

31