Actron CP7677 Operations Instructions download pdf (Page 13)

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Section 2. Automotive Testing

The digital multimeter is a very useful

tool for trouble-shooting automotive elec-

trical systems. This section describes

how to use the digital multimeter to test

the starting and charging system, igni-

tion system, fuel system, and engine

sensors. The digital multimeter can also

be used for general testing of fuses,

switches, solenoids, and relays.

General Testing

The digital multimeter can be used to

test fuses, switches, solenoids, and re-

lays.

Testing Fuses

This test checks to see if a fuse is blown.

You can use this test to check the internal

fuses inside the digital multimeter.

To test Fuses (see Fig. 16):

• If you hear tone - Fuse is good.

• If you don’t hear tone - Fuse is

blown and needs to be replaced.

NOTE: Always replace blown fuses

with same type and rating.

Testing Switches

This test checks to see if a switch

“Opens” and “Closes” properly.

To test Switches (see Fig. 17):

Fig. 17

Red

Typical "Push"

Button Switch

1. Insert BLACK test lead into COM

test lead jack.

2. Insert RED test lead into

test lead jack.

3. Turn multimeter rotary switch to

function.

4. Touch RED and BLACK test leads

together to test continuity.

Listen for tone to verify proper op-

eration.

5. Connect BLACK test lead to one

side of switch.

6. Connect RED test lead to other

side of switch.

Listen for tone:

• If you hear tone - The switch is

closed.

• If you don’t hear tone - The switch

is open.

7. Operate switch.

Listen for tone:

1. Insert BLACK test lead into COM

test lead jack.

2. Insert RED test lead into

test lead jack.

3. Turn multimeter rotary switch to

function.

4. Touch RED and BLACK test leads

together to test continuity.

Listen for tone to verify proper op-

eration.

5. Connect RED and BLACK test

leads to opposite ends of fuse.

Listen for tone:

Fig. 16

Red

Black

Fuse

Black

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