Lifan 720 (1.8 VVT) Electrical Instruction - page 2

5

Circuit Diagnosis

LIFAN 720

3 It means circuit fualt if light is not lit. If

using voltmeter and voltage display is

lower than the rated value with more than

1V, it means the circuit fault.

2.

Power Test

1 Disconnect the battery negative.
2 Connect one of the wire of the test light

with self-supply or the probe of the

ohmmeter to the component to be tested.

If using ohmmeter, please contact the two

probes each other and use reset button

to adjust the ohometer to zero.

3 Connect the other wire of the test light or

probe of the ohmmeter to the other side

of the load to be tested.

4 If the bulb is lit, it means the circuit is

continuous. If using ohmmeter, the

impedance value should be very small or

close to 0 Ω..

3. Short Circuit Test

1 Disconnect battery negative.
2 Connect one of the wire of the test light

with self-supply or the probe of the

ohmmeter to the outlet terminal of the

fuse.

3 Connect the other wire of the test light or

probe of the ohmmeter to the ground.

4 Disconnect all the loads to the fuse.

Note:If not disconnect all the loads to the

fuse, when testing the low impedance

circuit like lights, the ohmmeter will

always display the low impedance value.

This will cause wrong judgement.

5 Do the careful test from the place closest

to the fuse.

6 If the bulb is lit or ohmmeter has value

display less than 5 Ω., it means the short

circuit to the ground.

3

Switch

a1105005

5A

+B

0.5RD

0.5G

2 E00

1 E00

1 C00

I/P Fuse and Relay Box

Switch

Solenoid

Test Light

Voltmeter

a1105004

4. Voltage Drop Test

This is to test the voltage drop along the wire,

connector or switch.
1 Connect the positive probe of the

voltmeter to the end of the circuit close to

the battery (connector or switch side).

2 Connect the negative probe to the other

end of the circuit (the other side of the

connector or switch ).

3 Disconnect switch or connect it.
4 The voltmeter will display the voltage

drop between the two test points.

5 If the drop is more than 0.1 V (less than

50 mV for 5 V voltage circuit), it means

the circuit fault. Check loose, oxidation or

corrosion circuit.

Repair Tools

1. 5 KΩ Rheostat

It can simulate ohm-type sensor sginals, like

coolant temperature sensor, air intake

temperature sensor, etc. And help to make

quick adjustment on the performance of the

component.

2. LED Test Light

I/P Fuse and Relay Box

Switch

Selonoid

Voltmeter

5A

+B

0.5RD

0.5G

2 E00

1 E00

1 C00

a1105007

a1105008

a1105009

a1105010

6

Circuit Diagnosis

LIFAN 720

3

Bi-direction two-color LED light can change

its color when exchanging the positive and

negative. This feature can be used to test the

PWM control signals of Hall sensor.

3. Airbag Test Tool

Before installing a new airbag, plug this tool

to the airbag system, and use diagnostic tools

to test the airbag system to confirm it works

properly. After that, remove the airbag test

tool and install the new airbag. This process

can guarantee a safe airbag operation.

4. Probe

When testing a system component, insert this

tool into the connector from the back and do

not need to break the harness.

5. Terminal Repair Tool

When repairing the terminals, use this tool to

separate them from the connector.

a1105011

a1105012

a1105013

Terminal Repair

1. Remove the terminal pin.

2. Fix the clip with terminal repair tool.

3. Pull out the terminal from the rear of

connector.

a1105021

Terminal

Clip

Tool

a1105015

a1105014

7

Circuit Diagnosis

LIFAN 720

3

4. Clean and repair the terminals.

a1105016

Poor Ground Connection Repair

1. Remove the ground bolt.

2. Clean the two surfaces (both bolt side and

car contact side) of the copper ring with grit

cloth until the oxide completely cleared.

3. Clean the ground surface on the car with grit

cloth until it completely clean.

a1105017

a1105018

a1105019

8

Circuit Diagnosis

LIFAN 720

3

4. Install the harness and the bolt. Tighten to

specified torque.
Torque:M6 Bolts 8 Nm
M8 Bolts 20 Nm

a1105020

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