Lifan 620. Manual — part 15

27. DTC: P0508, Idle Speed Regulator Control Circuit Voltage Too Low (see Table 1-40)

Table 1-40

S/N Operation Test

Results

Actions

1

Connect the diagnostic instrument and adapter, and turn the

ignition switch to ON.

Next

step

Yes Next

step

2

Disconnect the idle speed regulator. Check the resistance

between pin A and pin D, as well as between pin B and pin C

3

1

2

3

1

ignition switch to ON.

Yes Next

step

2

Disconnect the idle speed regulator. Check the resistance

between pin A and pin D, as well as between pin B and pin C

of the regulator. Is the resistance about 53±5.3Ω under the

temperature of 20 ?

℃

No

Replace stepper motor

Yes

Repair or replace

harness

3

Check for open circuit between the pin A, B, C, D of the

regulator and the pin 65#, 66#, 67#, 64# of the ECU.

No

Diagnosis help

61

30. DTC: P0560, System Voltage Signal Abnormal (see Table 1-43)

Table 1-43

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 volatage with a multimeter. Is the voltage about

12V?

3

4

5

1

2

3

ECU and the pin 87# of the main relay repectively. Is the

resistance too high?

No Next

step

Yes Next

step

4

Start the engine, check if the generator charging voltage is

within 9-16V under different rotation speed.

No Replace

engine

Yes Diagnosis

help

5

Check the grounding point of the engine harness for normal

operation.

No

Repair or replace

harness

62

32. DTC: P0601, Electronic Control Unit Check Code Unprogrammed (see Table 1-45)

Table 1-45

S/N Operation Test

Results

Actions

1

Connect the diagnostic instrument and adapter, and turn the

ignition switch to ON.

Next

step

Yes Next

step

2

Clear the DTC, and check once again if the trouble is stable.

No Normal

3 Replace

ECU.

End

1

2

3

1

2

3

end of the relay.

No

Go to step 2

Yes Replace

relay

4

Measure the voltage between the pin 86# of the relay

(control end) and the power supply negative pole with a

multimeter. Is the voltage about 3.7V?

No Next

step

Yes

Repair or replace

harness

5

Check for open circuit between the pin 86# of the relay

(control end) and the 70# of the ECU with a multimeter.

No Diagnosis

help

63

35. DTC: P0646, A/C Compressor Relay Control Circuit Voltage Too Low (see Table 1-48)

Table 1-48

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 the A/C compressor relay, and turn the ignition

switch to ON. Measure the voltage between pin 30#, 85# of

the relay (power supply end) and the power supply negative

3

4

5

1

2

3

No

Go to step 2

Yes Replace

relay

4

Measure the voltage between the pin 86# of the relay

(control end) and the power supply negative pole with a

multimeter. Is the voltage about 3.7V?

No Next

step

Yes

Repair or replace

harness

5

Check for short to power supply between the pin 86# of the

relay (control end) and the 70# of the ECU with a multimeter.

No Diagnosis

help

64