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 CTIS power manifold casting and mounting base area for air leaks (5) Shut off engine (TM 9-2320360-10). NOTE ·  Tire must be deflated to 60 psi (414 kPa) or less to perform this test ·  Pressure relief valve remains closed unless pressure to tires exceeds 85 psi (586 kPa) (1) Start engine (TM 9-2320-360-10). (2) Set CTIS controller selector to HIGHWAY position (TM 9-2320360-10). (3) Move CTIS switch to ON position and/or push start button (TM 9-2320-360-10). (4) Check pressure relief valve for air leaks. (5) Shut off engine (TM 9-2320360-10). 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 9-2320360-10). (3) Move CTIS switch to ON position and/or push start button (TM 9-2320360-10) (4) Check for air escaping from the inside portion of the wheel and tire assemblies (5) Shut off engine (TM 9-2320460-10). Change 1  2-823