Lifan 620. Service manual - part 12

7. DTC: P0130, Upper Oxygen Sensor Signal Circuit Trouble    (see Table 1-20) 
  (Note: If the trouble of P0135 occurs simultaneously, please remove the trouble of P0135 at first, 
and then go to the following steps.) 
 

Table 1-20 

S/N Operation  Test 

Results 

Actions 

1 

Connect the diagnostic instrument and adapter, and turn the 

ignition switch to ON. 

 Next 

step 

Yes Diagnosis 

help 

2 

Start the engine, and keep idle speed until the coolant reaches 

3 

4 

1 

2 

Yes 

Repair or replace 

harness 

3 

Check for short to power supply between pin 36#, 18# of the 

ECU and pin A# (to the grey connection line of the oxygen 

sensor), B# (to the black connection line of the oxygen sensor) 

of the sensor with a multimeter. 

No Diagnosis 

help 

 
 
 
 

49

9. DTC: P0134, Upper Oxygen Sensor Signal Circuit Trouble    (see Table 1-22) 
(Note: If the trouble of P0135 occurs simultaneously, please remove the trouble of P0135 at first, 
and then go to the following steps.) 
 

Table 1-22 

S/N Operation Test 

Results

Actions 

1 

Connect the diagnostic instrument and adapter, and turn the 

ignition switch to ON. 

 Next 

step 

Yes Diagnosis 

help 

2 

Start the engine, and keep idle speed until the coolant reaches 

3 

1 

2 

3 

4 

Yes 

Repair or replace 

harness 

5 

Check for open circuit, short to power supply or ground 

between the pin 1# of the ECU, pin 87# of the main relay and 

the pin C# (to the white connection line of the oxygen sensor) 

and the pin D# (to the white connection line of the oxygen 

sensor) of the sensor with a multimeter. 

No Diagnosis 

help 

 
 
 
 

50

11. DTC: P0171, Air Fuel Ratio Closed Loop Control Self-adaptation Upper Limit Break  (see 
Table (1-24) 
 
(Note: If the DTC related to intake air pressure sensor, canister control valve, oxygen sensor is 
produced, please remove these troubles at first, and then go to the following steps.) 
 

Table 1-24 

S/N Operation Test 

Results 

Actions 

1 

2 

3 

4 

5 

 
 
 
 
 
 
 
 
 

51

12. DTC: P0172, Air Fuel Ratio Closed Loop Control Self-adaptation Bottom Limit Break (see 
Table 1-25) 
 
(Note: If the DTC related to intake air pressure sensor, canister control valve, oxygen sensor is 
produced, please remove these troubles at first, and then go to the following steps.) 
 

Table 1-25 

S/N Operation 

Test 

Results

Actions 

1 

Connect the diagnostic instrument and adapter, and turn the 

2 

3 

4 

5 

 
 
 
 
 
 
 
 
 
 
 
 
 
 
 

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