Dodge Neon / Neon SRT-4. Manual — part 513
variations in inflation pressure can produce inaccu-
rate wheel speed signals; however, the system will
continue to function when using the correct factory
mini-spare.
3.2
ABS DIAGNOSTIC TROUBLE CODES
The Controller Antilock Brake (CAB) may report
any of several diagnostic trouble codes (DTC)s. The
possible DTC’s for the ABS are listed in the table of
contents.
Diagnostic trouble codes are retained in memory
until erased using the DRBIII
t, or automatically
erased after 255 key cycles or 3500 miles.
3.2.1
SYSTEM INITIALIZATION
System initialization starts when the key is
turned to “run”. At this point, the CAB performs a
complete self-check of all electrical components in
the antilock brake systems. The ABS and brake
warning lamps will illuminate for 4 seconds with
ignition on.
At 20 km/h (12 mph) a dynamic test is performed.
This will momentarily run the pump/motor. If dur-
ing the dynamic test, the brake pedal is depressed,
the driver may feel the test through brake pedal
pulsations. This is a normal condition.
If any component sets a trouble code during
system initialization or dynamic check, the CAB
will illuminate the ABS warning lamp.
3.2.2
DIAGNOSTIC MODE
For a Mark 20e system to enter diagnostic mode,
vehicle speed must be below 10 km/h (6 mph) and
no ABS condition present. If vehicle speed is not
below 10 km/h (6 mph), a “no response” message
could be displayed by the DRBIII
t. The following
are characteristics of diagnostic mode:
•
The amber ABS and red brake warning indicator
will blink rapidly. If a hard trouble code is
present, such as a CAB Power Feed Circuit
diagnostic trouble code, the indicator will be
illuminated without blinking until the diagnostic
trouble condition is corrected.
•
Antilock operation is disabled.
3.2.3
INTERMITTENT DIAGNOSTIC
TROUBLE CODES
If the malfunction is not present while perform-
ing a test procedure, the diagnostic procedures will
not locate the problem. In this case, the code can
only suggest an area to inspect. Check for the
following:
•
loose or corroded conditions
•
damaged components (sensors, tone wheels)
•
damaged wiring
•
excessive axle shaft runout
•
hydraulic system leaks
•
foundation (non-ABS) brake system problems
If no obvious problems are found, erase diagnostic
trouble codes and, with the key on, wiggle the wire
harness and connectors. Recheck for codes periodi-
cally while working through the system. This pro-
cedure may uncover a difficult to locate malfunc-
tion.
3.3
FREEZE FRAME
Freeze Frame takes a ‘‘snapshot’’ of specific vehi-
cle information the instant an ABS failure is recog-
nized and stores this information into the CAB
memory. This information can be accessed using the
DRBIII
t to help diagnose the fault. Freeze Frame
will capture the first time failure or only a new
failure that occurs during the current ignition cycle.
3.4
USING THE DRBIII
T
Refer to the DRBIII
t user’s guide for instructions
and assistance with reading diagnostic trouble
codes, erasing diagnostic trouble codes and other
DRBIII
t functions.
3.5
DRBIII
T ERROR MESSAGES
Under normal operation, the DRBIII
t will dis-
play one of only two error messages:
– User-Requested
WARM
Boot
or
User-
Requested COLD Boot
If the DRBIII
t should display any other error
message, record the entire display and call the Star
Center. This is a sample of such an error message
display:
ver: 2.14
date: 26 Jul93
file: key_itf.cc
date: Jul 26 1993
line: 548
err. 0x1
User-Requested COLD boot
Press MORE to switch between this display
and the application screen.
Press F4 when done noting information.
3.5.1
DRBIII
T DOES NOT POWER UP
(BLANK SCREEN)
If the LED’s do not light or no sound is emitted at
start up, check for loose cable connections or a bad
cable. Check the vehicle battery voltage (data link
16-way connector cavity 16). A minimum of 11 volts
4
GENERAL INFORMATION
is required to adequately power the DRBIII
t. Also
check for a good ground at the DLC.
If all connections are proper between the
DRBIII
t and the vehicle or other devices, and the
vehicle battery is fully charged, an inoperative
DRBIII
t may be the result of faulty cable or vehicle
wiring.
3.5.2
DISPLAY IS NOT VISIBLE
Low temperatures will affect the visibility of the
display. Adjust the contrast to compensate for this
condition.
4.0
DISCLAIMERS, SAFETY,
WARNINGS
4.1
DISCLAIMERS
All information, illustrations, and specifications
contained in this manual are based on the latest
information available at the time of publication.
The right is reserved to make changes at any time
without notice.
4.2
SAFETY
4.2.1
TECHNICIAN SAFETY INFORMATION
WARNING: ENGINES PRODUCE CARBON
MONOXIDE THAT IS ODORLESS, CAUSES
SLOWER REACTION TIME, AND CAN LEAD
TO SERIOUS INJURY. WHEN THE ENGINE IS
OPERATING, KEEP SERVICE AREAS WELL
VENTILATED, OR ATTACH THE VEHICLE
EXHAUST SYSTEM TO THE SHOP EXHAUST
REMOVAL SYSTEM.
Set the parking brake and block the wheels before
testing or repairing the vehicle. It is especially
important to block the wheels on the vehicle; the
parking brake does not hold the front drive wheels.
When servicing a vehicle, always wear eye pro-
tection, and remove any metal jewelry such as
watchbands or bracelets that might make an inad-
vertent electrical contact.
When diagnosing an antilock brake or speed
proportional steering system problem, it is impor-
tant to follow approved procedures where applica-
ble. These procedures can be found in the service
manual. Following these procedures is very impor-
tant to safety of individuals performing diagnostic
tests.
4.2.2
VEHICLE PREPARATION FOR
TESTING
Make sure the vehicle being tested has a fully
charged battery. If it does not, false diagnostic codes
or error messages may occur.
4.2.3
SERVICING SUB—ASSEMBLIES
Some components of the antilock brake or speed
proportional steering system are intended to be
serviced in assembly only. Attempting to remove or
repair certain sub-components may result in per-
sonal 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
DRBIII
T SAFETY INFORMATION
WARNING: EXCEEDING THE LIMITS OF THE
DRBIII
T
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 DRBIII
t 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.
5
GENERAL INFORMATION
•
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 — 10 kHz
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
DRBIII
t 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
DRBIII
T
screen while in motion. Do not hang
the DRBIII
T
from the rear view mirror or
operate
it
yourself.
Have
an
assistant
available to operate the DRBIII
T
.
4.4
DIAGNOSIS
1. Your diagnostic test procedure must begin with a
thorough visual inspection of the ABS 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 DRBIII
t to the data link connector
located under the dash to the left of the steering
column. If the DRBIII
t does not power up, check
the power and ground supplies to the connector.
3. Select “Antilock Brakes”. Turn the ignition on. If
the DRBIII
t displays “No Response”, perform
the proper test.
4. Read and record all ABS diagnostic trouble 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
pedal. If the display does not match the state of
the pedal, perform the proper test. If a problem
with the amber “ABS” warning indicator exists,
refer to the proper test.
6. If no other problems are found, it will be neces-
sary to road test the vehicle. THE DRBIII
t
MUST NOT BE CONNECTED TO THE
DATA LINK CONNECTOR WHEN ROAD
TESTING FOR PROPER ANTILOCK OP-
ERATION. 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. 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
6
GENERAL INFORMATION
– 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 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.
5.0
REQUIRED TOOLS AND
EQUIPMENT
DRBIII
t (diagnostic read-out box)
jumper wires
ohmmeter
voltmeter
test lamp
6.0
GLOSSARY OF TERMS
ABS
antilock brake system
CAB
controller antilock brake
DC
direct current
DLC
data link connector
DRB
diagnostic read–out box
EVBP
electronic variable brake proportion-
ing
HCU
hydraulic control unit
HZ
Hertz
LF
left front
LR
left rear
PCI
Programmable Communication
Interference
PCM
Powertrain Control Module
PDC
power distribution center
P/M
pump motor
RF
right front
RR
right rear
SOL
solenoid
WSS
wheel speed sensor
7
GENERAL INFORMATION
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