8-5. WTEC III CODE READING AND CODE CLEARING PROCEDURES
This task covers:
a. Reading Diagnostic Codes
b. Clearing Active Diagnostic Codes
c. Clearing Historic Diagnostic Codes
d. Exiting the Diagnostic Display Mode
e. Follow-On Maintenance
Master power switch positioned to on (TM 9-2320-365-10).
a. Reading Diagnostic Codes.
Diagnostic codes may be viewed even while
vehicle is moving.
There are two types of diagnostic codes, active
and historic, which may be displayed on WTEC
III TPSS. An active diagnostic code indicates a
fault which is currently being detected by WTEC
III TPSS. An historic diagnostic code represents
a fault which was detected prior to engine
shutdown. All active diagnostic codes, except
main code 69 sub code 34, will become historic
codes when electrical power is removed from
WTEC III transmission ECU.
When an active diagnostic code is displayed on
WTEC III TPSS, the Light Emitting Diode (LED)
at upper right corner of MODE button will be
(1) Enter diagnostic display mode by pressing
(2) (up arrow and down arrow) buttons on WTEC III
TPSS selector (3) at the same time.