TM9-2320-360-20-3 Section  4 TROUBLESHOOTING    CHARTS E. FLASH CODE: 42 J1587   CODE: S21  1  -  TOO  MANY  SRS  (MISSING  SRS) STEP/SEQUENCE RESULT WHAT  TO  DO  NEXT 42-13 Check   TRS   Connectors l Check  connectors  at  TRS (both  harness  side  and  sensor side)  for  damage;  bent, corroded  or  unseated  pins or  sockets,  or  bad  contracts. 42-14 Verify SRS/TRS l Turn  ignition  off. l Reconnect  all  connectors. l Clear  codes. l Start  and  run  (TM  9-2320-360-10) engine  until  “Check  Engine’  light comes on or for 1 minute. l Stop   engine. l Read  inactive  codes. 42-15  Verify  Cranking Voltage l Turn  ignition  off. l Connect  all  connectors. l Fabricate  temporary  jumper harness  per  instructions  in Appendix  D,  Figure  D-24. l Connect  jumper  harness  to fully  charged  battery  (12  volt). l Connect  jumper  harness  to  ECM. l Try  to  start  engine. Connectors are okay. Problem  found. TRS  requires  replacement.  Notify supervisor.  Then  go  to  42-14. Repair    terminals/connectors (para 7-77). Then go to 42-30. No  Codes. Code  21/1  reappears (and  any  other  codes.) Repairs  are  complete. If TRS was just  replaced,  go to  42-7.  If  the  TRS  was not replaced,  go  to  42-6. Code(s)   other Go  to  START-1,  pg  H-25,  to than  Code  21/1  received. service  other  codes. Engine  starts. Service  discharged  battery (TM   9-6140-200-14). Then  go  to  42-30. Engine  does not start. Replace  ECM  (para   7-29.1). Then  go  to  42-30. H-267