Lifan 620. Manual — part 18

Table 1-55 (Continued)

S/N Operation Test

Results

Actions

Yes Next

step

10

Clean the fuel injector and check the fuel injector for

normal operation.

No

Replace fuel injector

Yes Renew

fuel

11

Check if the fuel is wrong or contains water.

No 17

Yes Next

step

73

6. Unstable idle speed at any time

Table 1-56

S/N Operation Test

Results

Actions

Yes

Remove the trouble

1

Turn the ignition switch to ON. Check if there is trouble

information records with a diagnostic instrument.

No Next

step

Yes

Replace idle speed actuator

2

Check if the idle speed actuator or the stepper motor

idle speed actuator is locked.

No Next

step

3

4

5

6

7

8

9

pin J1-47 and the pin J1-73 of the fuel bump relay, and

run the fuel pump. Check if the fuel pressure is about

380kPa.

No 13

Yes 12

10

Connect the battery and the fuel injector with a special

connector. With the voltage supply of 12V, check the fuel

injector for normal operation.

No Next

step

Yes Next

step

11

Clean the fuel injector and check the fuel injector for

normal operation.

No

Replace fuel injector

74

Table 1-56 (Continued)

S/N Operation Test

Results

Actions

Yes Replace

fuel

12

Check if the fuel is wrong or contains water.

No 18

Yes Next

step

13

Check if the fuel pressure is lower than 380kPa.

No 17

Yes Next

step

14

Close the fuel gauge valve. Turn on the ignition switch

15

16

17

18

19

20

21

No

Remove the trouble

75

7. Unstable idle speed during warm-up

Table 1-57

S/N Operation Test

Results

Actions

Yes

Remove the trouble

1

Turn the ignition switch to ON. Check if there is trouble

information records with a diagnostic instrument.

No Next

step

Yes Next

step

2

3

4

5

6

1

Yes Next

step

2

between the ECU and the harness. Check the voltage of

the pin J1-42 (intake air manifold absolute pressure

sensor output), J1-27 (intake air temperature sensor

output), J1-43 (coolant temperature sensor output),

J1-62, J1-06, J1-38 (oxygen sensor output), J1-54,

J1-33, J1-53, J1-34 (output to idle speed actuator) of the

the ECU. Is the voltage normal?

No

Repair or replace harness

Yes Next

step

3

Check the air filter for smoothness.

No Replace

76