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Page Title: TOO FEW SRS (MISSING SRS)
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TM9-2320-360-20-3 Section  4 TROUBLESHOOTING CHARTS E.  FLASH  CODE: 42 J1587   CODE: S21  1  -  TOO  FEW  SRS  (MISSING  SRS) NOTE - This chart is only to be used if: 1)  All  basic  mechanical  checks  and  physical  inspections  have  been  performed  with  no  problem  found,  and 2) Diagnosis of DDEC-III was started at step START-1, pg H-25 and you have now been referred here. NOTE - ECM must be removed (para 7-29.1) for access to TRS/SRS connectors. STEP/SEQUENCE RESULT 42-1 Resistance    Check l Turn  ignition  off. l Disconnect  engine  harness connector  at  ECM. l Read  resistance  between  socket S1  and  S2  on  engine  harness connector. 42-2 Check  for  Short l Disconnect  SRS  connector. l Read  resistance  between  sockets S1 and S2 on engine harness connector. l Also  read  resistance  between socket  S1  and  ground,  then between  socket  S2  and  ground. 42-3 Open  SRS  Line  Check l Disconnect  SRS  connector  and install  a jumper  wire  between sockets A and B of the SRS connector. l Read  resistance  between  sockets S1  and  S2  on  the  engine  harness connector. 42-4 Check   SRS   Resistance l Read  resistance  of  SRS  across sensor  pins  A  and  B. Less  than  or equal to 200 ohms. Greater  than 200 ohms  or  open. Less than or equal  to  10,000  ohms on  any  reading. Greater  than 10,000  ohms  or  open on all readings. Less than or equal to 5 ohms. Greater  than 5, ohms or open. Less  than 100 ohms. From 100 to 200 ohms. Greater  than 200 ohms. WHAT  TO  DO  NEXT Go  to  42-2. Go  to  42-3. A  short  exists  where  resistance was  less  than  10,000  ohms. Repair short. Then go to 42-30. Go  to  42-4. Go  to  42-4. Signal line (ckt #111) or return line (ckt #112) is open. Repair open. Then go to 42-30. Go  to  42-12. Go  to  42-5. Go  to  42-12. H-201

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