Pc Service Tool; Digital Multimeter (Dmm); Jumper Wires, Test Leads, And Test Lights - Yale 524150797 Maintenance Manual

ELECTRICAL SYSTEM
1. TRACTION CONTROLLER
2. POSITIVE CONNECTION
3. INSULATED JUMPER WIRES
4. 200-OHM, 2-WATT RESISTOR
5. NEGATIVE CONNECTION
Figure 9030-03-1. Discharging the Capacitors

PC Service Tool

The PC Service Tool is a Windows based service ap-
plication that is used to communicate with the truck's
electrical control system. It can be used to monitor the
status and condition of various systems. With this ca-
pability, the PC Service Tool can be used to monitor
component operation, or determine if abnormal
events have occurred in the truck, and assist with di-
agnostics and troubleshooting.

Digital Multimeter (DMM)

Digital multimeters provide several measurement
functions in one tool. A DMM should be capable of ac-
curately measuring voltage, amperage, and resist-
Check the Service Manual section in Yale Axcess Online for possible updates and check pertinent Bulletins
General Maintenance and Diagnostic Data
ance. Ensure that the multimeter used in trouble-
shooting procedures is accurate and that the test
leads do not have excessive resistance. A faulty me-
ter or damaged test leads will cause inaccurate read-
ings and incorrect electrical diagnoses.

Jumper Wires, Test Leads, and Test Lights

When using jumper wires, test leads, and test lights,
take care not to force tips into connector sockets. Use
appropriate clips and adapters to prevent damage to
connectors. Expanded or damaged sockets can
cause poor continuity between connections.
Jumper wires allow testing across a suspected open
in the circuit. Jumper wires can be used for located
opens, shorts, and performing voltage drops. If a cir-
cuit operates correctly with the jumper wire in place,
and is faulty when the jumper wire is removed, a fault
can be found in the bypassed location.
Jumper wires can also be used to eliminate sections
of the circuit to diagnose either power or grounds. Us-
ing the jumper wire to provide a component a known
good ground can help reduce the amount of checks
needed to diagnose a circuit.
Jumper wires can be used to bypass components
such as switches. If a faulty switch is suspected, re-
moving it from the circuit with a jumper wire can deter-
mine if a switch or component is at fault.
Jumper wires can be used to check for open or faulty
relay contacts which are often sealed and can take
additional steps to properly diagnose.
Test lights can be used when quick voltage or ground
checks are necessary. Many features operate on
switched voltage, and using a test light as a load de-
vice may be helpful. The test light may also be used
to verify continuity to B-. Discretion should be used
when troubleshooting a circuit using a test light, as
the light may illuminate even though there may be an
excessive amount of resistance on the ground circuit
or when a low voltage or amperage situation exists.
9030-03-3