Lifan 620. Service manual - part 14

20. DTC: P0444, Canister Control Valve Driving Stage Control Circuit Voltage Too Low  (see 
Table 1-33) 
 

Table 1-33 

S/N Operation Test 

Results 

Actions 

1 

Connect the diagnostic instrument and adapter, and turn the 

ignition switch to ON. 

 Next 

step 

2 

3 

4 

5 

6 

 
 
 
 
 
 
 
 
 
 
 
 
 
 

57

21. DTC: P0445, Canister Control Valve Driving Stage Control Circuit Voltage Too High  (see 
Table 1-34) 
 

Table 1-34 

S/N Operation Test 

Results 

Actions 

1 

Connect the diagnostic instrument and adapter, and turn the 

ignition switch to ON. 

 Next 

step 

Yes 

Go to step 4 

2 

Disconnect the canister control valve from the harness. 

Measure the voltage between the pin 1# of the control valve 

3 

4 

5 

6 

1 

2 

Yes 

harness 

3 

Check for open circuit or short to ground at the power supply 

end of the A/C condenser cooling fan relay. 

No 

Go to step 2 

Yes Replace 

relay 

4 

Check the voltage between the pin 86# of the relay (control 

end) and the power supply negative pole. Is the voltage 

between 3.7V? 

No Next 

step 

Yes 

Repair or replace 

harness 

5 

Check for open circuit or short to power supply or ground 

between the pin 86# of relay control end and the pin 50# of 

the ECU. 

No Diagnosis 

help 

 

58

23. DTC: P0481, A/C Condenser Cooling Fan B Relay Control Circuit Trouble    (see Table 1-36) 

 

Table 1-36 

S/N Operation Test 

Results 

Actions 

1 

Connect the diagnostic instrument and adapter, and turn the 

ignition switch to OFF. 

 Next 

step 

Yes 

Go to step 4 

2 

Disconnect A/C condenser cooling fan relay, and turn the 

ignition switch to ON. Check the voltage between the pin 

30#, 85# of the relay (power supply end) and the power 

3 

4 

5 

1 

2 

3 

Yes Next 

step 

4 

Check the vehicle speed sensor for normal operation. 

No 

Replace vehicle speed 

sensor 

Yes 

Repair or replace 

harness 

5 

Check for open circuit or short to power supply or ground 

between the vehicle speed sensor signal line and the pin 59# 

of the ECU. 

No Diagnosis 

help 

 

59

25. DTC: P0506, Idle Speed Too Low    (see Table 1-38) 

 

Table 1-38 

S/N Operation Test 

Results 

Actions 

1 

Connect the diagnostic instrument and adapter, and turn the 

ignition switch to OFF. 

 Next 

step 

Yes Next 

step 

2 

Check the throttle adjusting bolt, accelerator cable, throttle 

3 

4 

1 

2 

3 

Yes 

Necessary check and 

repair 

4 

A. Check the system for leakage; 

B. Check the fuel injector for leakage; 

C. Check if the pressure of the fuel supply system is too high.

No Diagnosis 

help 

 
 
 
 
 

60