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Page Title: CHECK GAUGES LIGHT ON AND NO ACTIVE CODE ON DDR
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Section  4 TM9-2320-360-20-3 TROUBLESHOOTING   CHARTS D. CHART -6 - “CHECK GAUGES” LIGHT ON AND NO ACTIVE CODE ON DDR 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. This is a Digital output function. STEP/SEQUENCE C 6-1 Determine   “Check Gauges”  Light  Status l Turn ignition on (engine not running)  while  at  the  same  time observing   “Check   Gauges”   light. C  6-2 Light  Status  -  DDR l Plug  in  DDR. l Select switch/light status. l Read   CGL. C  6-3 Check  for  Short l Turn  ignition  off. l Disconnect the vehicle harness connector  at  ECM. l Turn  ignition  on  (engine  not running)  while  at  same  time observing   “Check   Gauges”   light. C  6-4 Check  ECM Connectors l Check  terminals  at  vehicle harness   connector   (both   ECM and  harness  side)  for  damage bent,  corroded,  and  unseated pins or sockets. Pay close attention  to  B2  and  B3. RESULT “Check    Gauges” light  comes  on  for up  to  5  seconds, then  goes  out. “Check   Gauges”   light comes  on  and  stays  on. CGL  reads  on. Go    to    C    6 - 4 . CGL  reads  off. Go   to   C   6-3. “Check   Gauges”- light  comes  on and  stays  on. ‘Check    Gauges” light stays off. Terminals and   connectors are okay. Problem  found. WHAT  TO  DO  NEXT This  is  the  normal  operation. Unless  other  problems  exist, return  to  service. Go  to  C  6-2. “Check  Gauges”  light  driver  line (ckt  #509)  is  shorted  to  ground. Repair short. Then go to C6-30. Go   to   C   6-4. Replace  ECM  (para  7-29.1). Then  go  to  C6-30. Repair     terminals/connectors (pars  7-77).  Then  go  to  C6-30. H-75

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