Chrysler Town, Dodge Caravan. Manual — part 977
button to select YES or NO and MENU button to
confirm.
For a “YES” response the EVIC will display
“SERVICE TIRE PRESS. SYSTEM”.
For a “NO” response, the EVIC will revert to
previous display and display “ALL 5 TIRES W/
VEHICLE? Y” every time the ignition is cycled to
RUN and the missing tire ID is not received.
3.7.5
DIAGNOSING AND CLEARING
SYSTEM FAULTS
All Tire Pressure Monitoring System Faults are
specific to one location. If a no-transmit, “LOW
BATTERY”, “LOW or HIGH PRESSURE” fault is
detected, the location can be determined by the
DRBIII
t. The appropriate Sensor/Transmitter can
then be replaced or the out-of-spec pressure condi-
tion can be corrected.
•
If a single Sensor/Transmitter cannot be detected
by the EVIC, replace that Sensor/Transmitter.
•
If none of the Sensor/Transmitters can be de-
tected, refer to symptoms in the EVIC section.
•
If a BUCKET COUNTER test fails, and one or
more Sensor/Transmitters does not transmit, re-
place the affected Sensor/Transmitter.
•
If none of the Sensor/Transmitter causes the
BUCKET COUNTER to advance, replace the
EVIC.
•
If the EVIC displays SERVICE TIRE PRESS.
SYSTEM and the DRBIII
t sees no Sensor/
Transmitter fault or pressure out of specification,
1. attempt the Retrain procedure. If the display
reoccurs,
2. replace the EVIC.
3.7.6
SYSTEM TEST
A test of the Tire Pressure Monitoring System can
be initiated in the EVIC. The test sequence is as
follows:
1. Perform the RETRAIN TIRE SENSORS proce-
dure.
2. Press and hold the RESET and STEP buttons for
five seconds.
3. The EVIC will display BUCKET COUNTERS.
4. Drive the vehicle at 32 km/h (20 mph) for at least
2 minutes.
5. The counters will increase by one each time a
Sensor/Transmitter signal is received by the
EVIC.
6. Observe that the COUNTERS register at least 3
receptions for each Sensor/Transmitter.
7. Replace any Sensor/Transmitter that does not
meet specification.
8. The test will continue until any EVIC button is
pressed or until the ignition is cycled to OFF.
3.8
DRBIII
T ERROR MESSAGES AND
BLANK SCREEN
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.
3.8.1
DRBIII
T DOES NOT POWER UP
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
connector cavity 16). A minimum of 11 volts is
required to adequately power the DRBIII
t.
If all connections are proper and the vehicle
battery is fully charged, an inoperative DRBIII
t
may be the result of faulty cable or vehicle wiring.
3.8.2
DISPLAY IS NOT VISIBLE
Low temperatures will affect the visibility of the
display. Adjust the contrast to compensate for this
condition.
6
GENERAL INFORMATION
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 drive
wheels.
When servicing a vehicle, always wear eye pro-
tection, and remove any metal jewelry such as
rings, watchbands or bracelets that might make an
inadvertent electrical contact.
When diagnosing a chassis 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 the safety of individuals performing diag-
nostic tests.
4.2.2
VEHICLE PREPARATION FOR
TESTING
Make sure the vehicle being tested has a fully
charged battery. If is does not, false diagnostic codes
or error messages may occur.
4.2.3
SERVICING SUB-ASSEMBLIES
Some components of the chassis system are in-
tended to be serviced as an assembly only. Attempt-
ing to remove or repair certain system sub-
components may result in personal 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 functions 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.
•
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 load.
•
Disconnect the live test lead before disconnecting
the common 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.
7
GENERAL INFORMATION
4.3
WARNINGS
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.
WARNING:
BEFORE
ROAD
TESTING
A
VEHICLE,
BE
SURE
THAT
ALL
COMPONENTS
ARE
REASSEMBLED.
DURING THE TEST DRIVE, DO NOT TRY TO
READ THE DRB 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,
which is 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. Turn the ignition on. Select the system in ques-
tion. If the DRBIII
t displays “No Response”
condition you must diagnose that first.
4. Read and record all diagnostic trouble codes. For
ABS if the “CAB Power Feed Circuit” diagnostic
trouble code is present, it must be repaired prior
to addressing any other DTC’s. If any additional
DTC’s are present, proceed to the appropriate
test by locating the matching test in the Table of
Contents and begin to diagnose the symptom.
5. For ABS if there are no diagnostic trouble codes
present, identify the customer complaint. Select
“Inputs/Outputs” and read the brake switch in-
put as you press and release the brake pedal. If
the display does not match the state of the pedal,
perform the proper test by locating the matching
test in the Table of Contents and begin to diag-
nose the symptom. If a problem exists with the
yellow “ABS” warning indicator or the red
“Brake” indicator exists, refer to the proper tests
by locating the matching test in the Table of
Contents and begin to diagnose the symptom.
Read the traction control switch input as you
press and release the switch. If the display does
not match the state of the indicator perform the
proper test by locating the matching test in the
Table of Contents and begin to diagnose the
symptom.
6. If no other problems are found, it will be neces-
sary to road test the vehicle. Perform several
antilock stops from above 50 Km/h (30 mph) and
then repeat step 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 25 Km/h (15
mph) or 40 Km/h (24 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.
5.0
REQUIRED TOOLS AND
EQUIPMENT
DRBIII
t (diagnostic read-out box)
jumper wires
ohmmeter
voltmeter
test light
8
GENERAL INFORMATION
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
DTC
diagnostic test code
EVBP
electronic variable brake proportion-
ing
HCU
hydraulic control unit
ICU
integrated control unit
IPM
integrated power module
JBLK
junction block
PCI
programmable communication inter-
face
P/M
pump motor
WSS
wheel speed sensor
9
GENERAL INFORMATION
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