137 

No.078 Malfunction code: P0130 "signal circuit of upstream oxygen 

sensor malfunction"   

(Note: following diagnosis flowchart is applied when P0135 does not occur at the same time; if P0135 
malfunctions exist at the same time, deal with P0135 malfunctions, and then check according to the following 
flowchart.) 

Serial No.  Operation steps 

Results   

Follow-ups   

1 

Switch on diagnosis instrument and commutator, and place ignition switch 
to “ON”. 

 Next 

step 

Yes Diagnosis 

help 

2 

Start the engine, and make it operate at idling speed, till temperature of 
cooling liquid reached normal value. Observe changes of value of “voltage 
of oxygen sensor” on the diagnosis instrument, and the value shall be 
changed quickly between 100mV~900mV at this time. 

No Next 

step 

Yes 

Repair or replace 
harness 

3 

Check lines respectively between 36#, 18# of ECU and A# (opposed to 
grey connecting line of oxygen sensor), B# (opposed to black connecting 
line of oxygen sensor) of sensor connector are shorted to ground. 

No Next 

step 

Yes Repair 

accordingly

4 

A. Check admission system is severely leaking;   
B. Oil injector is blocked; 
C. Spark plug is with too large clearance;   
D. Resistance of sub live wire is too large; 
E. Tube of intake valve is worn; etc. 

No Diagnosis 

help 

No.079 Malfunction code: P0132 "voltage of upstream oxygen sensor 

circuit too high"   

(Note: following diagnosis flowchart is applied when P0135 does not occur at the same time; if P0135 
malfunctions exist at the same time, deal with P0135 malfunctions, and then check according to the following 
flowchart.) 

Serial No.  Operation steps 

Results   

Follow-ups   

1 

Switch on diagnosis instrument and commutator, and place ignition switch 
to “ON”. 

 Next 

step 

Yes Diagnosis 

help 

2 

Start the engine, and make it operate at idling speed, till temperature of 
cooling liquid reached normal value. Observe changes of value of “voltage 
of oxygen sensor” on the diagnosis instrument, and the value shall be 
changed quickly between 100mV~900mV at this time. 

No Next 

step 

Yes 

Repair or replace 

3 

Check lines respectively between 36#, 18# of ECU and A# (opposed to 
grey connecting line of oxygen sensor), B# (opposed to black connecting 
line of oxygen sensor) of sensor connector are shorted to power source. 

No Diagnosis 

help 

No.080 Malfunction code: P0134 "upstream oxygen sensor signal 

malfunction"  

(Note: following diagnosis flowchart is applied when P0135 does not occur at the same time; if P0135 
malfunctions exist at the same time, deal with P0135 malfunctions, and then check according to the following 
flowchart.) 

 
 

 

 

138 

Serial No.  Operation steps 

Results   

Follow-ups   

1 

Switch on diagnosis instrument and commutator, and place ignition switch 
to “ON”. 

 Next 

step 

Yes Diagnosis 

help 

2 

Start the engine, and make it operate at idling speed, till temperature of 
cooling liquid reached normal value. Observe changes of value of “voltage 
of oxygen sensor” on the diagnosis instrument, and the value shall be 
changed quickly between 100mV~900mV at this time. 

No Next 

step 

Yes 

Repair or replace 
harness 

3 

Check lines respectively between 36#, 18# of ECU and A# (opposed to 
grey connecting line of oxygen sensor), B# (opposed to black connecting 
line of oxygen sensor) of sensor connector are opened. 

No Diagnosis 

help 

No.081 Malfunction code: P0135 "heating circuit of upstream oxygen 

sensor malfunction"   

Serial No.  Operation steps 

Results   

Follow-ups   

1 

Switch on diagnosis instrument and commutator, and place ignition switch 
to “ON”. 

 Next 

step 

Yes Next 

step 

2 

Take out connector of oxygen sensor of harness, and check voltage 
between C# (opposed to white connecting line of oxygen sensor), D# 
(opposed to white connecting line of oxygen sensor) pins of this connector 
is around 12V with multimeter. 

No 

To step 4 

Yes Next 

step 

3 

Check resistance between C# (white), D# (white) pins of oxygen sensor is 
between 2~5Ω under 20  with multimeter.

℃

 

No Replace 

sensor 

Yes Replace 

fuse 

 

4 

Check 8A fuse of heating circuit of oxygen sensor is blown. 

No Next 

step 

Yes 

Repair or replace 
harness 

5 

Check lines respectively between 1# pin of ECU, 87# pin of main relay and 
C# (opposed to white connecting line of oxygen sensor), D# (opposed to 
white connecting line of oxygen sensor) of sensor connector are opened, or 
shorted to power source or ground. 

No Diagnosis 

help 

No.082 Malfunction code: P0171 “self-adapting of closed-loop control 

of air fuel ratio shall exceed upper part”   

 

(Note: following diagnosis flowchart is applied when malfunction codes such as admission pressure sensor, 
canister control valve, oxygen sensor do not occur at the same time; if relevant malfunction codes exist at the 
same time, deal with other malfunctions, and then check according to the following flowchart.) 

Serial No.  Operation steps 

Results   

Follow-ups   

 
 

 

 

139 

1 

Switch on diagnosis instrument and commutator, and place ignition switch 
to “ON”. 

 Next 

step 

Yes Next 

step 

2 

Start the engine, and make it operate at idling speed, till temperature of 
cooling liquid reached normal value. Under full condition, observe changes 
of value of “voltage of oxygen sensor” on the diagnosis instrument, and 
check the value is around 100mV under some conditions for a long time. 

No Diagnosis 

help 

Yes Next 

step 

3 

Switch on fuel pressure gauge at oil inlet pipe of fuel system, and observe 
pressure is around 350kPa under full condition. 

No 

Repair fuel system

Yes 

Repair or replace 
harness 

4 

Check lines respectively between 36#, 18# pins of ECU and A# (opposed to 
grey connecting line of oxygen sensor), B# (opposed to black connecting 
line of oxygen sensor) of sensor connector are shorted to power source. 

No Next 

step 

Yes Repair 

accordingly

5 

A. Check admission system is severely leaking;   
B. Oil injector is blocked; 
C. Spark plug is with too large clearance;   
D. Resistance of sub live wire is too large; 
E. Tube of intake valve is worn; etc. 

No Diagnosis 

help 

No.083 Malfunction code: P0172 “self-adapting of closed-loop control 

of air fuel ratio shall exceed lower part”   

(Note: following diagnosis flowchart is applied when malfunction codes such as admission pressure sensor, 
canister control valve, oxygen sensor do not occur at the same time; if relevant malfunction codes exist at the 
same time, deal with other malfunctions, and then check according to the following flowchart.) 

Serial No.  Operation steps 

Results   

Follow-ups   

1 

Switch on diagnosis instrument and commutator, and place ignition switch 
to “ON”. 

 Next 

step 

Yes Next 

step 

2 

Start the engine, and make it operate at idling speed, till temperature of 
cooling liquid reached normal value. Under full condition, observe changes 
of value of “voltage of oxygen sensor” on the diagnosis instrument, and 
check the value is around 900mV under some conditions for a long time. 

No Diagnosis 

help 

Yes Next 

step 

3 

Switch on fuel pressure gauge at oil inlet pipe of fuel system, and observe 
pressure is around 350kPa under full condition. 

No 

Repair fuel system 

4 

Check lines respectively between 36#, 18# pins of ECU and A# (opposed to 
grey connecting line of oxygen sensor), B# (opposed to black connecting 
line of oxygen sensor) of sensor connector are shorted to power source. 

Yes 

Repair or replace 
harness 

 
 

 

 

140 

No Next 

step 

Yes Repair 

accordingly

5 

A. Oil injector is leaking; 
B. Exhaust pipe is leaking; 
C. Ignition timing is incorrectly; etc. 

No Diagnosis 

help 

No.084 Malfunction code: P0201 "one-cylinder oil injector circuit 

malfunction"  

Serial No.  Operation steps 

Results   

Follow-ups   

1 

Switch on diagnosis instrument and commutator, and place ignition switch 
to “ON”. 

 Next 

step 

Yes 

To step 4 

2 

Take out connector of one-cylinder oil injector of harness, and check 
voltage between 1# pin of this harness and cathode of power source is 
around 12V. 

No Next 

step 

Yes 

Repair or replace 
harness 

3 

Check lines between 1# pin of connector of one-cylinder oil injector and 
main relay are opened or shorted to ground. 

No Next 

step 

Yes Next 

step 

4 

Check resistance between 1# and 2# pins of one-cylinder oil injector is 
between 11~13Ω under 20  with multimeter.

℃

 

No 

Replace oil injector

Yes Diagnosis 

help 

5 

Check voltage between 2# pin of one-cylinder oil injector connector and 
cathode of power source is around 3.7V with multimeter. 

No Next 

step 

Yes 

Repair or replace 
harness 

6 

Check lines between 2# pin of one-cylinder oil injector connector and 27# 
pin of ECU are opened or shorted to power source or ground. 

No Diagnosis 

help 

No.085 Malfunction code: P0202 "two-cylinder oil injector circuit 

malfunction"  

Serial No.  Operation steps 

Results   

Follow-ups   

1 

Switch on diagnosis instrument and commutator, and place ignition switch 
to “ON”. 

 Next 

step 

Yes 

To step 4 

2 

Take out connector of two-cylinder oil injector of harness, and check voltage 
between 1# pin of this harness and cathode of power source is around 12V.

No Next 

step 

Yes 

Repair or replace 
harness 

3 

Check lines between 1# pin of connector of two-cylinder oil injector and 
main relay are opened or shorted to ground. 

No Next 

step 

Yes Next 

step 

4 

Check resistance between 1# and 2# pins of two-cylinder oil injector is 
between 11~13Ω under 20  with multimeter.

℃

 

No 

Replace oil injector