Vehicle Damage Warnings; Road Testing A Complaint Vehicle; Diagnosis - Dodge ZB 2005 Service Manual

GENERAL INFORMATION
• 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 test lead.
•
When using the meter function, keep the
DRBIII 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.
Be careful when performing electrical tests so as
to prevent accidental shorting of terminals. Such
mistakes 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
DRBIII screen while in motion. Do not hang
the DRBIII from the rear view mirror or
operate it yourself.
available to operate the DRBIII .

4.4 DIAGNOSIS

1. Your diagnostic test procedure must begin with a
thorough visual inspection of the system in ques-
tion for damaged components or disconnected
connectors. For ABS, the brake lamps must be
operational prior to continuing.
Have an assistant
2. Connect the DRBIII to the data link connector
located under the dash. If the DRBIII does not
power up, check the power and ground supplies
to the connector.
3. Select the system in question. Turn the ignition
on. If the DRBIII displays "No Response", refer
to Communication in the Body Diagnostic Pro-
cedures manual to diagnose the symptom.
4. Read and record all diagnostic trouble codes. For
ABS, if the "Valve Power Feed Circuit" diagnos-
tic 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. For ABS, if there are no diagnostic trouble codes
present, select ''Inputs/Outputs'' and read the
brake switch input as your press and release the
brake pedal. If the display does not match the
state of the pedal, perform the proper test. For a
problem with the amber "ABS" warning indica-
tor, refer to the proper test.
6. For ABS, if no other problems are found, it will
be necessary to road test the vehicle. THE
DRBIII MUST NOT BE CONNECTED TO
THE DATA LINK CONNECTOR WHEN
ROAD TESTING FOR PROPER ANTILOCK
OPERATION. THE SYSTEM IS DISABLED
WHILE IN DIAGNOSTIC MODE. Perform
several antilock stops from above 50 Km/h (30
mph) and then repeat steps 2, 3, and 4. If any
diagnostic trouble codes are present, proceed to
the appropriate test.
7. For ABS, the following conditions should be
considered ''NORMAL'' operation, and no repairs
should be attempted to correct them.
– Brake pedal feedback during an ABS stop
(clicking, vibrating)
– Clicking, groaning or buzzing at 10 Km/h (6
mph) (drive off self test)
– Groaning noise during an ABS stop
– Slight brake pedal drop and pop noise when
ignition is initially turned on
– Brake pedal ratcheting down at the end of an
ABS stop
8. If the complaint is ABS ''cycling'' at the end of a
stop at low speeds, it may be caused by a
marginal wheel speed sensor signal. The sensor
air gap, tone wheel condition, and/or brakes
hanging up are possible causes of this condition.
9. After a road test in which no problems were
found, refer to any Technical Service Bulletins
that may apply.
6