WTEC III transmission ECU is capable of storing (logging) up to five diagnostic codes in memory. The
diagnostic code positions are identified as d1, d2, d3, d4, and d5. Diagnostic code position d1 represents
the most recently logged diagnostic code.
WTEC III TPSS will display the four position diagnostic codes one character at a time, beginning with the
most recently logged diagnostic code (d1). The following example shows main code 24 sub code 12
logged in diagnostic code position d1:
1. Code list position
2. Main code
3. Sub code
4. Code position repeats - d,1,2,4,1,2
Display of first diagnostic code (d1) will be repeated until MODE button is pressed to view remaining
diagnostic codes (d2, d3, d4, and d5) or until diagnostic mode is exited.
Any diagnostic code position which does not have a diagnostic code logged will display "--".
(2) Record first diagnostic code (d1) displayed on WTEC III
Pressing MODE button momentarily after fifth
diagnostic code (d5) is displayed will cause
code positions displayed to begin again with
first diagnostic code (d1).
(3) Press MODE button (4) momentarily to view next
diagnostic code (d2).
(4) Record diagnostic code, if any, displayed on WTEC III
(5) Perform steps (3) and (4) for remaining diagnostic code
positions (d3, d4, and d5).
(6) Refer to Table 8-2. WTEC III Diagnostic Code List
and Description for identification of diagnostic codes
and to determine which troubleshooting task(s) to perform.
Table 8-2. WTEC III Diagnostic Code List and Description
ECU input voltage, low/high
Throttle position sensor, failed low/high