TECHNICAL INFORMATION
5 - 11
World Transmission (WT) Diagnostic Codes
Diagnostic Code Memory
Diagnostic codes are logged in a list in memory (sometimes referred to as the queue), positioning the
most recently occurring code first and containing up to five codes. The codes continued in the list have
the information recorded as shown in the chart below. Access to the code list position, main code, sub
code and active indicator is through either the shifter display or the Pro-Link Diagnostic Datareader (DDR).
Access to the ignition cycle counter and event counter is through the DDR only.
Code List
Position
Main Code
Sub Code
Active
Indicator
Ignition Cycle
Counter
Event
Counter
d1
21
12
YES
00
10
d2
41
12
YES
00
04
d3
23
12
NO
08
02
d4
34
12
NO
13
01
d5
56
11
NO
22
02
Displayed on shifter display and DDR
YES=
ACTIVE=
MODE ON
Ignition cycle counter and event
counter are not available on shifter
display
Note:
All information is available with a DDR.
The following paragraphs define the different
parts of the code list.
Code list position:
The position 1 through 5 which a code occupies
in the code list in memory. Positions are shown
as
d1
(Diagnostic Code #1) through
d5
.
Main code
The general condition or area of fault detected
by ECU.
Sub Code
The specific area or condition under the main
code in which the condition was detected.
Active Indicator
Will be turned
ON
when a fault condition is ac-
tive (shifter will display
MODE ON
or the DDR
will display
YES
). Will be set to
OFF
when con-
ditions exist to indicate fault condition is gone.
Ignition cycle counter
Used to clear diagnostic codes that are inactive
from the code list in memory. Counter is incre-
mented each time a normal ECU powerdown
occurs following clearing of the Active Indicator.
Code will be cleared from the list when the
counter exceeds 25.
Event counter
Used to count the number of occurrences of a
diagnostic code that occur prior to the incident
being cleared from the code list. The most re-
cent code will be in position
d1
. If the most re-
cent code is one which is already in the code list,
that code will be moved to position
d1
, the Active
Indicator will be turned
ON
(shifter will display
MODE ON
or the DDR will display
YES
), the Ig-
nition Cycle Counter is cleared and
1
is added to
the Event counter.
