Dodge Viper SRT-10 (ZB). Manual — part 387

3.2.1

ABS 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.

At 20 km/h (12 mph) a dynamic test may be

performed. If the brake lamp switch is activated the
test will be run at 40 km/h (24 mph) regardless of
the brake lamp switch state. This will momentarily
run the pump/motor. If during the dynamic test, the
driver has his/her foot on the brake pedal, he/she
may feel the test through brake pedal pulsations.
This is a normal condition.

If any component causes a diagnostic trouble code

during system initialization or dynamic check, the
CAB will request the ABS indicator to illuminate.

3.2.2

DIAGNOSTIC MODE

For a Mark 20e system to enter a 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’’ mes-
sage could be displayed by the DRBIII

t. The follow-

ing are characteristics of diagnostic mode:

•

The amber ABS warning indicator will blink
rapidly. If a hard trouble code is present, such as
a CAB Power Feed Circuit diagnostic trouble
code, the ABS warning indicator will be illumi-
nated without blinking until the diagnostic trou-
ble code 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:

•

mechanical interference with brake or accelera-
tor pedal

•

loose or corroded conditions

•

damaged components (sensors, tone wheels,
pedal drive cable)

•

damaged wiring

•

excessive axle shaft runout

•

loose pedal mounting

•

hydraulic system leaks

•

regular brake system problems, non-ABS related

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 as you work through the system. This proce-
dure may uncover a difficult to locate malfunction.

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 for information and assistance. 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
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.

4

GENERAL INFORMATION

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 front-wheel drive
vehicles; 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 adjustable

pedals system problem, it is important to follow

approved procedures where applicable. These pro-
cedures can be found in the service manual. Follow-
ing these procedures is very important to the safety
of individuals 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 adjust-

able pedals system are intended to be serviced in
assembly only. Attempting to remove or repair cer-
tain sub-components may result in personal injury
and/or improper system operation. Only those com-
ponents with approved repair and installation pro-
cedures 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 SPECIFICATIONS LIMITS.

Follow the vehicle manufacturer’s service specifi-

cations at all times.

•

Do not use the DRBIII

t if it has been damaged.

•

Do not use the test leads if 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 - 10 kHz

Temperature

-58 - 1100°F
-50 - 600°C

* 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.

5

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

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.

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

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 system in ques-
tion for damaged components or disconnected
connectors. For ABS, the brake lamps must be
operational prior to continuing.

2. Connect the DRBIII

t to the data link connector

located under the dash. If the DRBIII

t 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

t 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

t 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

GENERAL INFORMATION

5.0

REQUIRED TOOLS AND
EQUIPMENT

DRBIII

t (diagnostic read-out box)

jumper wires
ohmmeter
voltmeter
test light

6.0

GLOSSARY OF TERMS

ABS

antilock brake system

BCM

Body Control Module

CAB

controller antilock brake

DC

direct current

DLC

data link connector

DRB

diagnostic read-out box

DTC

diagnostic test code

EVBP

Electronic Variable Brake Propor-
tioning

HCU

hydraulic control unit

HZ

Hertz

JBLK

junction block

JTEC

Jeep and Truck Engine Controller

LF

left front

LR

left rear

PCI

Programmable Communication In-
terface

PCM

Powertrain Control Module

PDC

power distribution center

P/M

pump motor

RF

right front

RR

right rear

SOL

solenoid

VSS

vehicle speed signal

WSS

wheel speed sensor

7

GENERAL INFORMATION