TM 5-4220-231-14&P TROUBLESHOOTING - (Con't) MALFUNCTION TEST    OR   INSPECTION CORRECTIVE ACTION Open     isolation    valve. If HP   IN gage    on  the   DACC   still  does    not  register    the   same    pressure as   the   HP  gage    on  the DASS,    the   HP   IN gage    on  the   DACC   is  faulty. Replace HP   IN  gage. If the   HP   IN gage    indicates normal    operating pressure, go  to  Step   3. Step   3.    Open    regulator     1/4   turn   and   read    LP  OUT   gage    on   primary    side   of  DACC. Ensure    that   LP OUT   gage isolation    valve   on   DACC   is  open. Open     isolation    valve. If LP  OUT   gage    does    not  function,    either    the   regulator is  faulty   or  the   LP  OUT   gage    is faulty . Go   to   Step 4. Step 4. To  test LP  OUT    gage on   the    DACC,   open LP  OUT   supply valve and    read LP  pressure gage on   VTA panel. If  LP  gage on   the   VTA   panel indicates pressure, and    LP  OUT   gage on    DACC   still  indicates no   pressure, LP  OUT   gage on   DACC    is  faulty. Replace LP  OUT   gage. If gage on   VTA   does not   register pressure, the    regulator on   DACC    is  faulty. Request intermediate direct    support. If LP  gage indicates normal operating pressure, go   to   Step 5. Step 5. Open LP  OUT   valve   on   the    DACC   Primary HP   Supply side. Step 6. Check pressure reading of  the   LP  pressure gage    on   the   VTA  panel. Gage should register the same pressure as    LP  OUT   gage on   DACC. If not,   the    LP  OUT   valve    is  faulty. Request intermediate direct    support. Check supply hoses from   the   DACC   to   the   VTA   for  kinks    or  clogs. Straighten and   clear hoses. 3-11