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