Chrysler Town & Country/Voyager, Dodge Caravan, Plymouth Voyager. Manual — part 102
4-SPEED ELECTRONIC TRANSAXLE ON-BOARD DIAGNOSTICS
INDEX
page
page
Ccd Bus
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 157
DRBII (Diagnostic Read-Out Box)
. . . . . . . . . . . . 158
Fault Code Charts
. . . . . . . . . . . . . . . . . . . . . . . 158
General Information . . . . . . . . . . . . . . . . . . . . . . . 157
Glossary . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 175
Limp-In Mode
. . . . . . . . . . . . . . . . . . . . . . . . . . . 157
On-Board Diagnostics Information
. . . . . . . . . . . . 157
System Fault Messages/Codes
. . . . . . . . . . . . . . 157
Wiring Diagram . . . . . . . . . . . . . . . . . . . . . . . . . . 174
GENERAL INFORMATION
The information in this manual is designed to help
the technician understand and repair the electronic
transaxle with the aid of the built in on-board diagnos-
tics.
Chrysler Corporation has developed a com-
plete set of diagnostic manuals which cover di-
agnosis. They have been designed to make tran-
saxle diagnosis accurate and simple. Use these
manuals with the DRBII and the latest cartridge,
when diagnosing transaxle problems.
ON-BOARD DIAGNOSTICS INFORMATION
The 4-Speed Electronic Transaxle is controlled and
monitored by the EATX controller. The controller moni-
tors critical input and output circuits within the Elec-
tronic Transaxle system.
Some circuits are tested continuously; others are checked
only under certain conditions. Each circuit monitored by the
controller has a corresponding fault message assigned to it
that can be read with the DRBII.
If the on-board diagnostic system senses that one of
the circuits is malfunctioning, the corresponding fault
message is stored in memory. If the malfunction goes
away after the fault code is stored, the controller will
erase the fault after 75 key cycles.
CCD BUS
In order to diagnose the EATX, fault codes in the
EATX controller’s memory should be read using the
Diagnostic Readout Box (DRBII). If more than one
fault code exists, diagnostic priority should be given to
the most recent code. With CCD bus bias and commu-
nication problems, however, the DRBII displays an
appropriate message and fault codes might not be
accessible until the bus problem is fixed. The following
is a list of probable causes for a bus problem:
• Open or short to ground/battery in either or both
CCD bus wires (pins 4 and 43).
• Open or short to ground/battery in either or both
EATX bias wires (pin 5 and 44) on vehicles requiring
EATX to bias the bus.
• Open or short to ground/battery in the diagnostic
connector bus wire.
• Internal failure of any controller connected to the
bus.
The CCD bus should have 2.5 volts (+2.5 volts on
CCD+ and -2.5 volts on CCD-).
The bus error message displayed by the DRBII
should be helpful in diagnosing the CCD bus.
For more detailed information on diagnosing CCD bus
problems, refer to the 1992 diagnostic procedures Manual for
non-communication with the CCD bus problems. All other
problems refer to the 1992 Body Vehicle Communications
Diagnostic Procedures Manual.
SYSTEM FAULT MESSAGES/CODES
Fault codes are two-digit numbers that identify
which circuit is malfunctioning. A fault code can be set
for hydraulic and mechanical reasons as well as for
electrical problems. In most cases, fault codes do not
pinpoint which specific component is defective.
Fault code can only be read with the use of the
DRBII Read-out Box or equivalent.
HARD FAULTS
Any fault code that comes back within 3 engine
starts (reset count 3 or less) is a ‘‘Hard Fault’’. This
means that the defect is there every time the controller
checks that circuit.
SOFT FAULTS
A ‘‘Soft Fault’’ is one that occurs intermittently. It is
not there every time the controller checks the circuit.
Most soft faults are caused by wiring or connector
problems. Intermittent defects must be looked for
under the specific conditions that caused them.
LIMP-IN MODE
The controller continuously checks for electrical and
internal transaxle problems. When a problem is
sensed, the controller stores a fault code. All but twelve
of these codes cause the transaxle to go into the
‘‘Limp-in mode’’. While in this mode, electrical power is
taken away from the transaxle. When this happens,
the only transaxle ranges that will function are:
• Park
• Neutral
• Reverse
• Second Gear
.
TRANSAXLE
21 - 157
No upshifts or downshifts are allowed while in the
Limp-in mode. The position of the manual valve alone
allows the three ranges that are available.
Although engine performance will be reduced while
in this mode, the vehicle can be driven in for service.
DRBII (DIAGNOSTIC READ-OUT BOX)
The DRBII is a diagnostic read-out box designed by
Chrysler to gain access to the on-board diagnostics that
are found on all Chrysler-built cars and trucks.
The DRBII has a few diagnostic capabilities by itself.
To perform most diagnostic tests, a program cartridge
must be inserted. It contains the diagnostic test pro-
grams.
There are diagnostic read-out boxes available from
other manufactures that can be used on Chrysler
vehicles. However, the diagnostic test procedures in
this manual have been designed for use with the
Chrysler’s DRBII diagnostic readout box.
The DRBII operates by communicating with the
controller of the vehicle system being tested. To com-
municate with the controller, the DRBII must be con-
nected to the blue CCD bus connector located under the
instrument panel. Refer to the‘‘Using the DRBII’’
manual or the Diagnostic Procedures Manual for com-
plete information on how to hook up and use the
DRBII.
FAULT CODE CHARTS
Below is a brief description of what each section of
the fault code charts are addressing.
• FAULT CODE-Tells the code number and name (as
shown on the DRBII).
• BACKGROUND-A brief description of the circuit
that the controller is monitoring.
• WHEN CHECKED-The point of time or condition
when the controller makes it’s system check.
• ARMING CONDITIONS-The parameters that
must be met before a code can be set.
• FAULT CONDITION-What the controller saw that
is determined to be a problem. (ie. voltage to high or
low, switch/solenoid problems)
• FAULT SET TIME-Refers to the amount of time (in
seconds) a failure must occur before a fault code is set
in memory.
• EFFECT-Refers to how the fault effects transaxle
operations.
• POSSIBLE CAUSE-Refers to the systems or cir-
cuits which could cause the fault to be recorded.
FAULT CODE 11
21 - 158
TRANSAXLE
.
FAULT CODE 12
FAULT CODE 13
.
TRANSAXLE
21 - 159
FAULT CODE 14
FAULT CODE 15
21 - 160
TRANSAXLE
.
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