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Page Title: FIRST CHART FOR DIAGNOSIS OF DDEC-III USING DDR (Contd)
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TM9-2320-360-20-3 Section  4 TROUBLESHOOTING   CHARTS C.  START  -  FIRST  CHART  FOR  DIAGNOSIS  OF  DDEC-III  USING  DDR  (Cont’d) STEP/SEQUENCE RESULT WHAT  TO  DO  NEXT START-8 Check  for  Short Plug  DDR  into  Connector. Select   SWITCH/LIGHT   STATS on  DDR. l Read  Diagnostic  Request  SW. status. START-9 Check  for  +12 Volts  at  DDR Connector l Turn  ignition  on. l Read voltage at the DDR connector,  from  pin  “C”  (red  lead to  pin  “E”  (black  lead). ON. Ckt #528 is shorted to  ground.  Repair  short, then  go  to  START-30. OFF. Go to Chart 9, page H-91. Greater  than or  equal  to  10.0  volts. There is a problem with either the DDR or the data link lines. Go to C7-4,  page  H-81.  (For  diagno- sis of DDEC III without a DDR, go to CEL-1 on page H-35. Less  than 10.0 volts. Either  the  switched  +12  volt  line or the ground line is open to the DDR  connector.  Repair  open. Then  go  to  START-30. H-31

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