Actron AutoAnalyzer CP7665 User Manual download pdf (Page 13)

13

Section 2. Automotive Testing

The digital multimeter is a very use-

ful tool for trouble-shooting automo-

tive electrical systems. This section

describes how to use the digital mul-

timeter to test the starting and charg-

ing system, ignition 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 relays.

Testing Fuses

This test checks to see if a fuse is

blown.

To test Fuses (see Fig. 14):

Fig. 15

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 2000

Ω function.

4. Connect BLACK test lead to

one side of switch.

5. Connect RED test lead to other

side of switch.

• If the reading is zero - The

switch is closed.

• If the reading is overrange -

The switch is open.

6. Operate switch.

• If the reading is zero - The

switch is closed.

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 2000

Ω function.

4. Connect RED and BLACK test

leads to opposite ends of fuse.

• If the reading is zero - Fuse is

good.

Fig. 14

Red

Black

Fuse

Black

• If the reading is overrange -

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. 15):

1 2 ... 8 9 10 11 12 13 14 15 16 17 18 ... 31 32

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