TM 9-2320-272-10
2-31.
CTIS OPERATION UNDER UNUSUAL CONDITIONS (Contd)
b.
The selector panel (1) is part of the Electronic Control Unit (ECU) (4) and contains selectors for the four
preset tire pressure modes and a run flat selector. Each selector has its own light. A steady selector light shows that the
tire pressure selected has been achieved. A flashing selector light means that the system is working to change tire
pressures (para. 3-5).
c.
HWY Mode. The highway tire pressure selector is the normal operating mode of CTIS. The HWY mode (8)
is 60 psi (414 kPa) (80 psi (552kPa) for M936A2 wrecker). If a lower tire pressure mode had been selected the last time
the vehicle was operated, CTIS will automatically begin to inflate to the highway setting.
d.
X-C Mode. The cross-country tire pressure selector X/C (7) is used for operating the vehicle on non-paved
secondary roads and unimproved surfaces. It allows operation up to 35 mph (56 km/h) (25 mph (40 km/h) on M936A2
wrecker). When 35 mph (56 km/h) is exceeded for more than one minute, the amber overspeed warning light (2) will flash.
If 35 mph (56 km/h) is exceeded for more than two minutes, CTIS will automatically begin to inflate to HWY (8) mode.
e.
Sand Mode. When the mission requires maximum traction in sand, snow, or mud select SAND (6) on
selector panel (1). It allows operation up to 20 mph (32 km/h) (15 mph (24 km/h) on M936A2 wrecker). When 20 mph (32
km/h) is exceeded for more than one minute, the amber overspeed warning light (2) will flash. If 20 mph (32 km/h) is
exceeded for more than two minutes, CTIS will automatically begin to inflate to X/C (7) pressure.
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