Table of Contents
Advertisement
•
Do not exceed the limits shown in the table.
FUNCTION
Volts
Ohms (resistance)*
Frequency measured
Frequency generated
Temperature
*Ohms cannot be measured if voltage is present.
Ohms 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 measured voltage above 25v
DC or 25v AC.
•
The circuit being tested must be protected by a
10A fuse or circuit breaker.
•
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 load.
•
Disconnect the live test lead before disconnecting
the common test lead.
•
When using the meter function, keep the DRBI-
II away from spark plug or coil wires to avoid
measuring error from outside interference.
4.3 WARNINGS
4.3.1 VEHICLE DAMAGE WARNINGS
Before disconnecting any control module, make
sure the ignition switch is in the lock position.
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 the wire and eventu-
ally cause the wire to fail because of corrosion.
Be careful when performing electrical tests so as
to prevent accidental shorting of terminals. Such
mistakes can damage fuses or components. Also, a
second DTC could be set, making diagnosis of the
original problem more difficult.
When replacing a blown fuse, it is important to
use only a fuse having the correct amperage rating.
The use of a fuse with a rating other than indicated
INPUT LIMIT
0-500 volts peak AC
0-500 volts DC
0-1.12 megohms
0-10 khz
-58-1100°F
-50-600C
GENERAL INFORMATION
may result in a dangerous electrical system over-
load. If a properly rated fuse continues to blow, it
indicates a problem in the circuit that must be
corrected.
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
DTC or symptom condition.
CAUTION:
BEFORE
VEHICLE,
BE
COMPONENTS
DURING THE TEST DRIVE, DO NOT TRY TO
READ DRBIII
SCREEN WHILE IN MOTION.
DO NOT HANG THE DRBIII
REAR VIEW MIRROR OR OPERATE IT
YOURSELF.
HAVE
AVAILABLE TO OPERATE THE DRBIII .
Road testing is an essential step in the diagnostic
process that must not be overlooked. Along with the
diagnostic information obtained from the DRBIII
Scan Tool and the original customer concern, the
road test helps verify the problem was current and
any repairs performed, fixed the vehicle correctly.
Always operate and observe the vehicle under ac-
tual driving conditions.
Just as important as the road test is, there are
preliminary inspections that should be performed
prior to the road test. Always check the fluid level
and condition before taking the vehicle on a road
test. Determine if an incorrect fluid type is being
used, improper fluid will result in erratic transmis-
sion operation.
Some of the conditions of incorrect fluid level are
as follows:
•
Delayed engagement
•
Poor shifting or erratic shifting
•
Excessive noise
•
Overheating
The next step is to verify that the shift linkage is
correctly adjusted. If the shifter is incorrectly ad-
justed, a number of complaints can result.
The control module monitors the Shift Lever
Position (SLP) Sensor continuously. If the shifter is
incorrectly adjusted, the control module will sense a
shift lever position that is not correct for the gear
chosen by the driver. This may cause a DTC to be
set.
The following complaints may also be the result
of an incorrectly adjusted shifter:
•
Delayed clutch engagement
•
Erratic shifts
7
ROAD
TESTING
SURE
THAT
ARE
REASSEMBLED.
FROM THE
AN
ASSISTANT
A
ALL
Advertisement
Table of Contents
