10-2.   ENGINE   ELECTRONIC   CONTROL MODULE  (EECM).  (cont.) a.   Test.   (cont.) (c)   Move   MASTER   SWITCH   to START    position. The   STARTER   light   should come   on. Quickly   increase   function   generator frequency   until   STARTER   and   IGNITION   lights go   off   and   FUEL   light   goes   on.   This   should happen between 1965 and 2059 Hz. (d)   Continue   to   increase   function generator   frequency   until   READY   TO   LOAD light   comes   on. Should   happen   between   3287 and   3421   Hz. (e)   Set   functional   generator   fre- quency   at   3500   Hz.   Monitor   fuel   pump   output waveform   on   oscilloscope   while   tuning   function generator  frequency  between  3500  and  3000  Hz. The   waveform   pulse   width   should   vary   inversely proportional   to   frequency   being   applied   and be   of   an   amplitude   of   20-28   Vdc   peak   to   peak to 8-10 Vdc peak to peak. NOTE Disregard  the  leading  edge  spike  on  this DC  pulse.  The  vertical  pulse  shown  on the   oscilloscope   is   the   fuel   pump   off- time.  As  the  frequency  is  tuned  between 3500  to  3000  Hz  the  vertical  pulse  will also   vary   in   width   and   height.   The highest   voltage   and   pulse   width   will occur   at   the   highest   frequency.   This indicates   that   the   pump   will   be   off the   greatest   amount   of   time   since the  EECM  is  reducing  the  fuel  to  the turbine. Inversely,   the   smallest   pulse will  occur  at  the  lower  frequency  when the  EECM  is  maximizing  the  fuel  pump on-time   to   increase   the   fuel   to   the turbine. (f)   Move   MASTER   SWITCH   to OFF  position.    All  lights  should  go  off. (g)   Any   discrepancy   noted   during the   above   procedure   indicates   a   failure   in   the EECM   pump   control   circuit.   Refer   to   Table   2-4, Malfunction    6. b.   Circuit   Card   Replacement. (1)   Removal. (a)   Place   EECM   so   that   bottom cover faces up. (b)   Remove   screws   (1,   figure   10-2), washers (2), and bottom cover (3). (c)   Tag   and   disconnect   connector (4). ARMY TM  5-6115-612-34 MARINE CORPS TM 6115-34/8 AIR FORCE TO 36C2-3-471-2 NAVY AG-320B0-MME-000 To   prevent   damage   to   jumper   cable (8),   use   care   when   removing   circuit cards. (d)   Remove   screws   (5)   and   lock- washers  (6). (e)   Carefully   lift   switch   circuit   card (7)   and   disconnect   jumper   cable   (8).   Remove card and jumper. (f)   Tag   and   disconnect   connector (9). (g)  Remove  screws  (10)  and  washers (11). (h)  Remove  spacer  posts  (12),  micro- processor  circuit  card  (13),  hex  spacer  posts  (14), and lockwashers (15). (i)   Tag   and   disconnect   connector (16). (j)  Remove  screws  (17),  Iockwashers (18),  and  power  circuit  card  (19). (k)  Remove  screws  (20),  Iockwashers (21), hex spacer posts (22), and washers (23). (2)    Installation. (a)  Place  Iockwashers  (21)  on  screws (20)  and  install  in  EECM. (b)   Place   washers   (23)   on   exposed threads  of  screws  (20).  Add  hex  spacer  posts  (22) and  torque  to  10-12  inch  pounds  (1.1-1.4  Nm). (c)  Position  power  circuit  card  (19) on   hex   spacer   posts   (22)   and   secure   with   lock- washers   (18)   and   screws   (17).   Torque   to   10-12 inch  pounds  (1.1-1.4  Nm). (d)   Insert   connector   (16)   into   power circuit   card. (e)   Place   washers   (11)   on   screws (10)  and  install  in  EECM. (f)   Place Iockwashers   (15)   on exposed  threads  of  screws  (10).  Add  hex  spacer posts (14) and torque to 10-12 inch pounds (1.1-1.4   Nm). (g)   Position   microprocessor   circuit card  (13)  on  hex  spacer  posts  (14)  and  install  hex spacer  posts  (12). (h)   Insert   connector   (9)   into   micro- processor circuit card. Change 1 10-15