Lifan 620. 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