Section  4 TROUBLESHOOTING CHARTS E. FLASH CODE: 41 J1587   CODE: S21  0  -  TOO  MANY  SRS  (MISSING  TRS) STEP/SEQUENCE 41-5 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). 41-6 Check  for  SRS  Code l Was there also a Code 21/1? 41-7 Check   ECM   Connectors l Check  terminals  at  engine harness  connector  (both  ECM and  harness  side)  for  damage, corrosion,  and  unseated  pins  or sockets. 41-9 SRS   Resistance   Check l Read  resistance  between  sockets S1 and S2 on engine harness connector. TM9-2320-360-20-3 RESULT WHAT  TO  DO  NEXT 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  41-30. Gap  setting  is  correct. Go  to  41-6. Terminals  and connectors  are  okay. Problem  found. Replace  ECM  (para  7-29.1). Then  go  to  41-30. Repair    terminals/connectors (para  7-77).  Then  go  to  41-30. Less  than  or equal  to  200  ohms. Go  to  41-9. Greater  than 200  ohms  or  open. Go   to   41-10. H-193