bulb MAZDA 232 1990 Workshop Manual Suplement

GI CAUTKN
SMUGIX-a21
I VOLTMETER
1 9MUGlX-021
POWER SOURC
ELECTRICAL TROUBLESHOOTING TOOLS
Test Light
The test light, as shown in the figure, uses a f2V bulb. The
two lead wires should be connected to
probes.
The test light is used for simple voltage checks and for check-
ing for short circuits.
Caution
l When checking the control unit, never use a butt,
over 3.4w.
Jumper Wire
The jumper wire is used for testing by shorting across switch
terminals and ground connections.
Caution
l Do not connect a jumper wire from the power source
, line to a body ground; this may cause burning or
other damage to harnesses or electronic com-
ponents. -
Voltmeter
The DC voltmeter is used to measure of circuit
voltage. A volt-
meter with a range of 15V or more is used by connecting the
positive ( + ) probe (red lead wire) to the point where voltage
is to be measured and the negative (-1 probe (black lead
wire) to a body ground.
Diagnosis Connector
Insert the probe into the service hole when connecting a jum-
per wire to the diagnosis connector.
Caution
l Do not insert the jumper wire probe into the diag-
nosis connector terminal, which may damage the
terminal.
Ohmmeter
The ohmmeter is used to measure the resistance between two
points in a circuit and atso to check for continuity and diagno-
sis of short circuits.
Caution
l Do not attempt to connect the ohmmeter to any cir-
cuit to which voltage is applied; this may burn or
otherwise damage the ohmmeter.