Actron AutoAnalyzer CP7665 - Manual (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):