Loose or dirty connectors may cause
intermittent loss of power to transmission
ECU and diagnostic codes to be logged.
Ensure that all connectors are clean and tight
before performing troubleshooting. Failure to
comply may result in incorrect test results.
Use care when testing electrical connectors.
Do not damage connector pins or sockets
with multimeter probes. Failure to comply
may result in damage to equipment.
Inspect connector pins/sockets for damage,
corrosion, and serviceability. Check that
connector pins are not pushed back and
are capable of making good contact.
Main display code 21 needs to be cleared
manually from WTEC III transmission ECU
after a maintenance task has been performed
and before vehicle is returned to service
WTEC III TRANSMISSION ECU RESET CHECK
(1) Cycle master power switch to on
(TM 9-2320-366-10-1), then to off five
times to clear existing throttle count
(2) Position master power switch to on
(3) Depress accelerator pedal from idle position
to full throttle position (TM 9-2320-366-
10-1) to set new 0% and 100% throttle
count values in WTEC III transmission ECU.
(4) Clear diagnostic code from WTEC III
transmission ECU display (para 8-5).
(5) If main code 21 does not reappear, electrical
communication between WTEC III
transmission ECU and TPS may be faulty. If
main code 21 reappears, TPS may be faulty.
(6) Position master power switch to off