(1) Select X-C mode at CTIS ECU
(2) Turn on headlights (TM 9-2320-365-10).
(3) Perform road test.
(4) Increase speed to 40 mph.
(5) Check if overspeed warning light flashes.
(6) After about one minute, check if overspeed
pressure change is activated to raise tire pressure
to HWY mode.
(7) If both functions fail to activate, speed signal to
ECU is faulty or ECU may be faulty.
(8) Shut down engine (TM 9-2320-365-10).