TM9-2320-360-20-3 Section 4 TROUBLESHOOTING CHARTS E.   FLASH   CODE:   42 J1587   CODE: S21 1 - TOO FEW SRS (MISSING SRS) STEP/SEQUENCE RESULT I WHAT TO DO NEXT 42-5 Check TRS/SRS Gap l Turn   camshaft   counterclockwise until TRS is over a TRS “tooth” of  pulse  wheel. l Tap the front of pulse wheel. rearward with a soft hammer (to remove  camshaft  end  play). l Install  TRS/SRS  alignment  tool and  check  gap.  (nominal  gap 0.020” or 0.5 mm). 42-6 Check for TRS Code l Was there also a Code 21/0? 42-7 Check ECM Connectors l Check  terminals  at  engine harness  connector  (both  ECM and  harness  side)  for  damage, corrosion,  and  unseated  pins  or sockets. 42-8 TRS Resistance Check l Read  resistance  between  sockets T1 and T2 on engine harness connector. Incorrect  gap. Loosen the screw at top of TRS/SRS  mounting  bracket. (Don’t  touch  the  two  screws  that go into block front end plate -they  will  affect  engine  timing.) Adjust  the  TRS/SRS  until  gap setting  is  correct.  Tighten  screw. (If  problem  returns,  pulse  wheel may be loose or bad, notify supervisor).  Then  go  to  42-30. Gap  setting  is  correct Go    to    42-6. Terminals  and connectors  are  okay. Then  go  to  42-15. Problem  found. Repair   terminals/connectors (para  7-77).  Then  go  to  42-30. Go  to  42-9. 200  ohms  or  open. Go  to  42-10. H-203