Troubleshooting With A Short Finder; Probing Electrical Connectors; Using Connector Test Adapters; Using Fused Jumper Wires - GMC Chevrolet Camaro 1998 Service Manual

)
)
)
Body and Accessories
Following are examples of the various methods of
connecting the DMM to the circuit to be tested:
• Backprobe both ends of the connector and either
hold the leads in place while manipulating the
connector or tape the leads to the harness
for continuous monitoring while you perform other
operations or test driving. Refer to Probing
Electrical Connectors.
• Disconnect the harness at both ends of the
suspected circuit where it connects either
to a component or to other harnesses.
• If the system that is being diagnosed has a
specified pinout or breakout box, it may be used
in order to simplify connecting the DMM to
the circuit or for testing multiple circuits quickly.
Troubleshooting with a Short Finder
The J 8681-A can locate hidden shorts to ground.
The short finder creates a pulsing magnetic field in
the shorted circuit and shows the location of the short
through the body trim or sheet metal.
Probing Electrical Connectors
Important: Always be sure to reinstall the Connector
Position Assurance (CPA) and Terminal Position
Assurance (TPA) when reconnecting connectors or
replacing terminals.
Frontprobe
Disconnect the connector and probe the terminals
from the mating side (front) of the connector.
Notice: Do not insert test equipment probes into any
connector or fuse block terminal. The diameter of
the test probes will deform most terminals. A deformed
terminal can cause a poor connection, which can
result in system failures. Always use the J 35616-A
Connector Test Adapter Kit orthe J 42675 Flat
Wire Probe Adapter Kit in order to frontprobe
terminals. Do not use paper clips or other substitutes
as they can damage terminals and cause incorrect
measurements.
Backprobe
Do not disconnect the connector and probe the
terminals from the harness side (back) of the
connector.
Important:
• Backprobe connector terminals only when
specifically required in diagnostic procedures.
• Do not backprobe a sealed (Weather Pack®)
connector, less than a 280 series Metri-Pack
connector, a Micro-Pack connector, or a flat wire
(dock and lock) connector.
Wiring Systems 8-299
• Backprobing can be a source of damage to
connector terminals. Use care in order to avoid
deforming the terminal, either by forcing the
test probe too far into the cavity or by using too
large of a test probe.
• After backprobing any connector, inspect for
terminal damage. If terminal damage is suspected,
test for proper terminal contact.
Using Connector Test Adapters
Notice:
Do not insert test equipment probes into any
connector or fuse block terminal. The diameter of
the test probes will deform most terminals. A deformed
terminal can cause a poor connection, which can
result in system failures. Always use the. J 35616-A
Connector Test Adapter Kit or the
J 42675 Flat
Wire Probe Adapter Kit in order to frontprobe
terminals. Do not use paper clips or other substitutes
as they can damage terminals and cause incorrect
measurements.
Using Fused Jumper Wires
Important: A fused jumper may not protect solid state
components from being damaged.
The J 36169-A fused jumper includes small clamp
connectors that provide adaptation to most connectors
without damage. This fused jumper wire is supplied
with a 20 A 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.
Measuring Voltage
Notice:
Refer to Test Probe Notice in Cautions and
Notices.
The following procedure measures the voltage at a
selected point in a circuit.
1. Apply power to the circuit.
2. Set the rotary dial of the DMM into the V (AC) or
V (DC) position.
3. Connect the positive lead of the DMM to the point
of the circuit to be tested.
4. Connect the negative lead of the DMM to a good
ground.
5. Operate the circuit.
6. The DMM displays the voltage measured at
that point.