Pontiac Fiero 1988 Service Manual page 938

TROUBLESHOOTING TOOLS • TROUBLESHOOTING TESTS
FUSED JUMPER WIRE
A fused jumper is available (J-36169 or equiv-
alent) with small clamp connectors providing
adaptation to most connectors without
damage. This fused jumper wire is supplied
with a 20 amp fuse which may not be suitable
for some circuits. Do not use a fuse with a
higher rating than the fuse that protects the
circuit being tested.
C A U T I O N :
Do not use fused jumper wire
in any instance to substitute for inputs or
outputs at the ECM (Electronic Control
Module), BCM (Body Control Module), or
any microprocessor device.
SHORT FINDER
Short Finders are available (J-8681 or equiv-
alent) to locate hidden shorts to ground. The
short finder creates a pulsing magnetic field in
the shorted circuit and shows you the location
of the short through body trim or sheet metal.
F U S E T E S T E R
A simple tester that indicates a blown fuse is
available (J-34764 or equivalent). To check a
fuse the tester is applied directly to the fuse in
the fuse block. Two probes contact the fuse. The
probes are either placed into the slots of a flat
fuse or to the metal ends of a glass fuse. With
power on, a red LED in the tester lights if the
fuse is open. The handle of the tester is a tool for
removing either type of fuse.
TROUBLESHOOTING T E S T S
TESTING FOR VOLTAGE
1. Connect one lead of a test light to a known
good ground. If you are using a voltmeter,
be sure it is the voltmeter's negative lead
that you have connected to ground.
2. Connect the other lead of the test light or
voltmeter to a selected test point (connec-
tor or terminal).
3. If the test light glows, there is voltage pre-
sent. If you are using a voltmeter, note the
voltage reading. It should be within one
volt of measured Battery voltage. A loss of
more than one volt indicates a problem.
HOT AT ALL TIMES
TESTING FOR CONTINUITY
1. Disconnect the car battery.
2. Connect one lead of a self-powered test light
or ohmmeter to one end of the part of the
circuit you wish to test.
3. Connect the other lead to the other end of
the circuit.
4. If the self-powered test light glows, there is
continuity. If you are using an ohmmeter,
low or no resistance means good continuity.
BLOWER
SWITCH
Continuity Check Through A Switch
Voltage Check