4.2.4 DRBIIIT SAFETY INFORMATION
WARNING: EXCEEDING THE LIMITS OF THE
DRBIIIT MULTIMETER IS DANGEROUS. IT
CAN EXPOSE YOU TO SERIOUS OR
POSSIBLY FATAL INJURY. CAREFULLY
READ AND UNDERSTAND THE CAUTIONS
AND THE SPECIFICATION LIMITS.
• Follow the vehicle manufacturer’s service speci-
fications at all times.
• Do not use the DRBIIIt if it has been damaged.
• 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, tips, or the circuit being tested.
• Choose the proper range and function for the
measurement. Do not try voltage or current mea-
surements that may exceed the rated capacity.
• 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 megohms
Frequency Measured
Frequency Generated
0—10kHz
Temperature -58 — 1100° F
-50 — 600° C
* Ohms cannot be measured if voltage is
present. Ohm can be measured only in 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.
• Use the low current shunt to measure circuits up
to 10A. Use the high current clamp to measure
circuits exceeding 10A.
• When testing for the presence of voltage or cur-
rent, make sure the meter is functioning cor-
rectly. Take a reading of a known voltage or
current before accepting a zero reading.
• When measuring current, connect the meter in
series with the lead.
• When using the meter function, keep the
DRBIIIt away from spark plug or coil wires to
avoid measuring error from outside interference.
4.3 WARNING
4.3.1 VEHICLE DAMAGE WARNINGS
Before disconnecting any control module, make
sure the ignition is “off”. Failure to do so could
damage the module.
When testing voltage or continuity at any control
module, use the terminal side (not the wire end) of
the connector. Do not probe a wire through the
insulation, this will damage it and eventually cause
it to fail because of corrosion.
Use care when performing electrical tests so as to
prevent accidental shorting of terminals. Such mis-
takes can damage fuses or components. Also, a
second code could be set, making diagnosis of the
original problem more difficult.
4.3.2 ROAD TESTING A COMPLAINT
VEHICLE
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 try to read the
DRBIIIT screen while in motion. Do not hang
the DRBIIIT from the rear view mirror or
operate it yourself. Have an assistant
available to operate the DRBIIIT.
4.4 DIAGNOSIS
1. Your diagnostic test procedure must begin witha
thorough visual inspection of theABS system for
damaged components or disconnected connec-
tors. The brake lamps must be operational, and
if they are not, repair them prior to continuing.
2. Connect the DRBIIIt to the data link connector
located under the dash to the left of the steering
column. If the DRBIIIt does not power up, check
the power and ground supplies to the connector.
3. Select “Antilock Brakes”. Turn the ignition on. If
the DRBIIIt displays “No Response”, perform
the proper test.
4. Read and record allABS diagnostictrouble codes
and Freeze Frame information. If the “Valve
Power Feed Circuit” diagnostic trouble code is
present, it must be repaired prior to addressing
any other DTC’s. If any additional codes are
present, proceed to the appropriate test.
5. If there are no diagnostic trouble codes present,
select “Inputs/Outputs” and read the brake
switch input as you press and release the brake
6
GENERAL INFORMATION
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