Chery A11. Manual — part 178

Maintenance Manual for Chery · Windcloud

M7.9.7 EFI System

Yes

Repair as per
diagnosis

4

A. Check intake system for severe air leakage;
B. Check injectors for blockage;
C. Check spark plug to see if clearance is proper;
D. Check high voltage wire to see if resistance is

too high;

E. Check intake conduit to see if it is worn out,

etc.

No

Diagnosis
Instruction

Failure code: P0132 too high circuit voltage of upstream oxygen sensor

(Note: the following diagnosing process shall apply only when failure code of P0135 does not
occur at the same time. In case this failure code occurs concurrently, please fix it fisrt before
examining and repairing as per the following process.)

Step Operation

Result Solution

1

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

Go to next step

Yes

Diagnosis
Instruction

2

Start engine and idle it until coolant temperature is
normal. Observe Oxygen Sensor Voltage to see if
the indication quickly changes between
100mV-900mV.

No

Go to next step

Yes

Repair or
replace wire
harness

3

Check respectively the connections between Pin 36
of ECU and Pin A (corresponding to gray wire of
oxygen sensor) of sensor connector, Pin 18 of ECU
and Pin B (corresponding to black wire of oxygen
sensor) of sensor connector to see if they are short
circuit to power.

No

Diagnosis
Instruction

Failure code: P0134 signal error of upstream oxygen sensor

(Note: the following diagnosing process shall apply only when failure code of P0135 does not
occur at the same time. In case this failure code occurs concurrently, please fix it fisrt before
examining and repairing as per the following process.)
Step Operation

Result Solution

1

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

Go to next step

Yes

Diagnosis
Instruction

2

Start engine and idle it until coolant temperature is
normal. Observe Oxygen Sensor Voltage to see if
the indication quickly changes between
100mV-900mV.

No

Go to next step

3

Check respectively the connections between Pin 36
of ECU and Pin A (corresponding to gray wire of
oxygen sensor) of sensor connector Pin 18 of ECU

Yes

Repair or
replace wire
harness

20

Maintenance Manual for Chery · Windcloud

M7.9.7 EFI System

oxygen sensor) of sensor connector, Pin 18 of ECU
and Pin B (corresponding to black wire of oxygen
sensor) of sensor connector to see if open circuit
occurs.

No

Diagnosis
Instruction

Failure code: P0135 heating circuit error of upstream oxygen sensor

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 oxygen sensor connector from wire harness,
and check the voltage between Pin C
(corresponding to white wire of oxygen sensor) and
Pin D (corresponding to white wire of oxygen
sensor) of the connector with a multimeter to see if
it is around 12V.

No

Go to Step 4

Yes

Go to next step

3

Check the resistance between Pin C (white) and Pin
D (white) of oxygen sensor with a multimeter to see
if it is between 1-6Ω (20℃).

No Replace

sensor

Yes Replace

fuse

4

Check the 8A fuse in oxygen sensor heating circuit
to see if it is blown.

No

Go to next step

Yes

Repair or
replace wire
harness

5

Check respectively the connections between Pin 1
of ECU and Pin C (corresponding to white wire of
oxygen sensor) of sensor connector, Pin 87 of main
relay and Pin D (corresponding to white wire of
oxygen sensor) of sensor connector to see if open or
short circuit to power/ground occurs.

No

Diagnosis
Instruction

Failure code: P0171 self-adaptation of air fuel ratio closed-loop control

exceeds upper limit

(Note: the following diagnosing process shall apply only when failure codes of intake
pressure sensor, carbon canister control valve and oxygen sensor do not occur at the same
time. In case these failure codes occur concurrently, please fix other failures fisrt before
examining and repairing as per the following process.)

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

Start engine and idle it until coolant temperature is
normal. Observe Oxygen Sensor Voltage on scanner
under all working conditions to see if the value
indication maintains stable around 100mV under
some working conditions for a long time.

No

Diagnosis
Instruction

21

Maintenance Manual for Chery · Windcloud

M7.9.7 EFI System

Yes

Go to next step

3

Connect a fuel pressure gauge to fuel inlet pipe of
fuel system and observe fuel pressure under all
working conditions to see if it is around 350kPa.

No

Check and
repair fuel
system

Yes

Repair or
replace wire
harness

4

Check respectively the connections between Pin 36
of ECU and Pin A (corresponding to gray wire of
oxygen sensor) of sensor connector, Pin 18 of ECU
and Pin B (corresponding to black wire of oxygen
sensor) of sensor connector to see if they are short
circuit to ground.

No

Go to next step

5

A. Check intake system for severe air leakage;
B. Check injectors for blockage;
C. Check spark plug to see if clearance is proper;
D. Check sub live wire to see if resistance is too

high;

E. Check valve clearance to see if it is proper, etc.

Yes

Repair as per
diagnosis

Failure code: P0172 self-adaptation of air fuel ratio closed-loop control

exceeds lower limit

(Note: the following diagnosing process shall apply only when failure codes of intake
pressure sensor, carbon canister control valve and oxygen sensor do not occur at the same
time. In case these failure codes occur concurrently, please fix other failures fisrt before
examining and repairing as per the following process.)

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

Start engine and idle it until coolant temperature is
normal. Observe Oxygen Sensor Voltage on scanner
under all working conditions to see if the value
indication maintains stable around 900mV under
some working conditions for a long time.

No

Diagnosis
Instruction

Yes

Go to next step

3

Connect a fuel pressure gauge to fuel inlet pipe of
fuel system and observe fuel pressure under all
working conditions to see if it is around 350kPa.

No

Check and
repair fuel
system

Yes

Repair or
replace wire
harness

4

Check respectively the connections between Pin 36
of ECU and Pin A (corresponding to gray wire of
oxygen sensor) of sensor connector, Pin 18 of ECU
and Pin B (corresponding to black wire of oxygen
sensor) of sensor connector to see if short circuit
occurs.

No

Go to next step

22

Maintenance Manual for Chery · Windcloud

M7.9.7 EFI System

Yes

Repair as per
diagnosis

5

A. Check injector for leakage;
B. Check exhaust pipe for leakage;
C. Check ignition timing to see if it is proper;
D. Check intake conduit to see if it is worn out;
E. Check valve clearance to see if it is proper; etc.

No

Diagnosis
Instruction

Failure code: P0201 injector circuit error in Cylinder 1

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 Cylinder 1 injector connector from wire
harness, check the voltage between Pin 1 of the
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 the connection between Pin 1 of Cylinder 1
injector connector and main relay to see if open or
short circuit to ground occurs.

No

Go to next step

Yes

Go to next step

4

Check the resistance between Pin 1 and Pin 2 of
Cylinder 1 injector with a multimeter to see if it is
around 11-16Ω at 20℃.

No

Replace
injector

Yes

Diagnosis
Instruction

5

Check the voltage between Pin 2 of Cylinder 1
injector 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 Cylinder 1
injector connector and Pin 27 of ECU to see if open,
short circuit to power/ground occurs.

No

Diagnosis
Instruction

Failure code: P0202 injector circuit error in Cylinder 2

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 Cylinder 2 injector connector from wire
harness, check the voltage between Pin 1 of the
connector and cathode of power supply with a
multimeter to see if it is around 12V.

No

Go to next step

3

Check the connection between Pin 1 of Cylinder 2
injector connector and main relay to see if open
circuit or short circuit to ground occurs.

Yes

Repair or
replace wire
harness

23