CTIS wheel info.

[ILLUSTRATION OMITTED]

Don't be tempted to manually add air to any tire on the vehicle while operating the central tire inflation system (CTIS). You can mess up the CTIS' electronic control unit (ECU). Then your mechanic will have to disconnect the CTIS system to manually add air.

[ILLUSTRATION OMITTED]

The CTIS regulates the air pressure, adding or removing air as necessary. Once you crank up your truck, the ECU automatically checks and regulates the air pressure in each tire.

If you suspect the tire pressure is still not right, check to see that you have selected the proper ECU mode.

For example, if you select "sand," the CTIS lowers the tire's air pressure for driving in the sand.

[ILLUSTRATION OMITTED]

If after several minutes you notice under-inflated tires and you've done the checks in the -10 TM, stop. That's all you should do. Call in your mechanic for some help.

Air Filter Screen

Something your mechanic can check out is the little air filter (screen) that filters out dust, sand and dirt in the trucks' CTIS. The little filter, shown as Item 21 in Fig 153 of TM 9-2320-391-24P, clogs up, causing restricted air flow in the CTIS.

[ILLUSTRATIONS OMITTED]

Suspect a clogged filter? Your best bet is to have your mechanic clean the filter or replace it with NSN 4460-01-284-2344. The filter should be replaced at least once a year.