TM 9-2320-360-20-1 WARNING · Exercise extreme caution when working around wheels or under truck while engine is running. Movement of truck may cause severe injury or death. Wear safety goggles when performing leakage tests on valves air hoses.  Failure to comply may cause serious eye Injury due to high air pressure. NOTE Tire must be deflated to 60 psi (414 kPa)  or less to perform this test. (1) Start engine (TM 9-2320-360-10). (2) Set CTIS controller selector to HIGHWAY position (TM 9-2320-360-10 (3) Move CTIS switch to ON position and/or push start button (TM 9-2320-360-10 (4) Check axle manifolds for air leaks (5) Shut off engine (TM 9-2320-360-10). NOTE Tire must be deflated to 60 psi (414 kPa)  or less to perform this test. (1) Start engine (TM 9-2320-360-10). (2) Set CTIS controller selector to HIGHWAY position (TM 9-2320-360-10) (3) Move CTIS switch to ON position (TM 9-2320-360-10) (4) Check air lines, fittings and bulkhead connections from axle manifold to axle spindle for air leaks, damage, or crimps (5) Shut off engine (TM 9-2320-360-10). NOTE Tire must be deflated to 60 psi (414 kPa) or less to perform this test. (1) Remove four nuts and wheel cover. (2) Start engine (TM 9-2320-360-10). (3) Set OTIS controller selector to HIGHWAY position (TM 9-2320-360-10). (4) Move CTIS switch to ON position and/or push start button (TM 9-2320-360-10). (5) Check CTIS hoses from wheel hub to CTIS wheel valve for air leaks, damage, or crimps (6) Shut off engine (TM 9-2320-360-10). Change 1  2-845