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 · Excessive inflation time, sometimes accompanied by low air light is normal with engine at Idle and/or with use of air operated accessories. · Air system pressure must be 120 psi (827 kPa) before beginning troubleshooting If air pressure gage does not Indicate 120 psi (827 kPa), wait for system air pressure to build before beginning troubleshooting · CTIS air lines are pressurized only when CTIS is in inflate, deflate, or test cycles · Tests 1 thru 4 can be made consecutively while the CTI system is in the inflate cycle · Soap solution may be used to detect air leaks (1) Deflate tire to 60 psi (414 kPa)or less (2) Start engine (TM 9-2320-360-10) (3) Set CTIS 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 air lines, fittings and bulkhead connections from axle manifold to axle spindle for air leaks, damage, or crimps. (6) 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 CTIS controller selector to HIGHWAY position (TM 9-2320360-10) (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  2-813