Specifications

service manual. Following these procedures is very
important to the safety of the individuals perform-
ing the diagnostic tests.
4.2.2 VEHICLE PREPARATION FOR
TESTING
Make sure the vehicle being tested has a fully
charged battery. If itdoes not, false diagnostic codes
or error messages may occur.
4.2.3 SERVICING SUB-ASSEMBLIES
Some components of the powertrain system are
intended to be serviced as an assembly only. At-
tempting to remove or repair certain system sub-
components may result in personal injury and/or
improper system operation. Only those components
with approved repair and installation procedures in
the service manual should be serviced.
4.2.4 DRBIIIT SAFETY INFORMATION
WARNING: EXCEEDING THE LIMITS OF THE
DRBIIIT MULTIMETER IS DANGEROUS. IT
CAN EXPOSE YOU TO SERIOUS OR
POSSIBLE FATAL INJURY. CAREFULLY
READ AND UNDERSTAND THE CAUTIONS
AND SPECIFICATION LIMITS.
Follow the vehicle manufacturer’s service specifi-
cations at all times.
– Do not use the DRBIIIt if it has been dam-
aged.
– Do not use the test leads if the insulation is
damaged or if metal is exposed.
– To avoid electrical shock, do not touch the test
leads, tip or the circuit being tested.
– Choose the proper range and function for the
measurement. Do not try voltage or current
measurements that may exceed the rated ca-
pacity.
– Do not exceed the limits shown in the table
below:
FUNCTION INPUT LIMIT
Volts 0–500 peak volts AC
0–500 volts DC
Ohms (Resistance)* 0–1.12 megaohms
Frequency Measure
Frequency Generated
0–10 kHz
Temperature –58 – +1100°F
–50 – +600°C
* Ohms cannot be measured if voltage is present.
Ohms can be measured only on a non-powered
circuit.
– Voltage between any terminal and ground
must not exceed 500v DC or 500v peak AC.
– Use caution when measuring voltage above
25v DC or 25v AC.
– The circuit being tested must be protected by a
10 amp fuse or circuit breaker.
– Use the low current shunt to measure circuits
up to 10 amps. Use the high current shunt to
measure circuits exceeding 10 amps.
– When testing for the presence of voltage or
current, make sure the meter is functioning
correctly. Take a reading of a known voltage or
current before accepting a zero reading.
– When measuring current, connect themeter in
series with the load.
– Disconnect the live test lead before disconnect-
ing the common test lead.
4.3 WARNINGS AND CAUTIONS
4.3.1 ROAD TEST WARNINGS
Some complaints will require a test drive as part
of the repair verification procedure. The purpose of
the test drive is to try to duplicate the diagnostic
code or symptom condition.
CAUTION: Before road testing a vehicle, be
sure that all components are reassembled.
During the test drive, do not hang the DRBIIIT
from the rear view mirror. Do not attempt to
read the DRBIIIT while driving. Have an
assistant available to operate the DRBIIIT.
4.3.2 VEHICLE DAMAGE CAUTIONS
Before disconnecting any control module, make
sure the ignition is off. Failure to do so could
damage the module. When testing voltage or circuit
integrity at any control module, use the terminal
side (not the wire end) of the harness connector. Do
not probe through the insulation; this will damage
it and eventually cause it to fail because of corro-
sion.
Be careful when performing electrical test so as to
prevent accidental shorting of terminals. Such a
mistake can damage fuses or components. Also, a
second code could be set, making diagnosis of the
original problem more difficult.
5.0 REQUIRED TOOLS AND
EQUIPMENT
DRBIIIt (diagnostic read-out box) scan tool
vacuum gauge
ammeter
9
GENERAL INFORMATION