TM9-2320-360-20-3 Section  4 TROUBLESHOOTING   CHARTS C. START - FIRST CHART FOR DlAGNOSlS OF DDEC-III USING DDR (Cont’d) STEP/SEQUENCE RESULT I WHAT  TO  DO  NEXT START-3 Read All Codes Using DDR l Remove eight screws and cover from  electronic  control  box assembly. l Plug DDR into DDL connector. l Read all inactive codes by selecting  inactive  codes on  DDR. START-4 Attempt  to  Make Codes  Actlve *SEE NOTE BELOW* Clear  codes  by  selecting CLEAR CODES on the DDR.    Attempt to start and run the  engine  (TM  9-2320-360-10).    Try to get the “Check Engine” light on by: -warming  up  the  engine. -slowly  changing  the  RPM  from -idle to no load speed. Position  left  ENGINE  SPEED CONTROL  switch  to  HIGH  ENGINE IDLE and press PUSH TO LOCK ENGINE @ HIGH IDLE SWITCH.    Run engine for 1 minute or until “Check  Engine”  light  comes  on. Codes  52,  110,  175/3, Follow   appropriate   diagnostic 174/3,  or  190/0. charts  for  code(s)  received. (See  Table  of  Contents  on page   ii). Any  codes  except 52,  110,  175/3, 174/3,  or  190/0. No  Codes. DDR display reads “NO  DATA  BEING RECEIVED   FROM SYSTEM” or “DDEC SYSTEM   NOT RESPONDING”. DDR  display  is blank  or  random. Go to START-4. Go to Chart 1, page H-40. Go to Chart 7, page H-79. Go  to  START-9. Engine  will not start. “Check   Engine” light is on. Go to Chart 2, page H-43. Read active codes on DDR while light is on and follow the  appropriate  diagnostic chart  on  page  ii. “Check  Engine” light is off. “Check   Engine” flashes  briefly. Problem  may  be  intermittent  - See Chart 1, page H-40, Step C1-2. Go  to   START-5. *NOTE: If  a  potential  engine  damaging  Code  (i.e.,  100/1)  exists,  monitor  that  parameter when  running  engine. H-27