TM9-2320-360-20-3 Section 4 TROUBLESHOOTING CHARTS E.  ENG5V  -  ENGINE  HARNESS  +5  VOLTS  SUPPLY  (CONT’D) ENG5V-4 Check for +5 Volts or  Return  Open l Turn  ignition  off. l Disconnect  the  engine  harness connector  at  the  ECM. l Install  a  jumper  wire  between sockets A and C of any sensor connector  that  reads  less  than 4.7  volts  in  Step  ENG5V-2. l Read  resistance  between  sockets W1  and  Y2  of  the  engine  harness connector. ENG5V-5  Check  for  Short  to Ground l Turn  ignition  off. l Remove  jumper  wire. l Read  resistance  between  sockets A  and  C  of  the  sensor  connector. l Also  read  resistance  between socket  C  of  the  sensor  connector and  a  good  ground. ENG5V-5  Check  for  Short  to Battery  + l Turn  ignition  off. l Disconnect  batteries  (para  7-61). l Disconnect  all  six  connectors  at the  ECM. l Read  resistance  between  socket W1  on  the  engine  harness connector  and  B3  on  the  vehicle harness   connector. l Also  read  resistance  between socket  W1  on  the  engine  harness connector  and  the  following sockets on the 5-way power harness  connector:  A  and  C. RESULT Less  than  or equal to 5 ohms. Greater  than 5 ohms or open. Both readings are greater  than  10,000 ohms  or  open. Either   reading   is less  than  or  equal to  10,000  ohms. All   readings   are greater  than  10,000 ohms  or  open. Any  reading  is less  than  or  equal to  10,000  ohms. WHAT  TO  DO  NEXT Go  to  ENG5V-5. Either the engine +5 volt line (ckt  #416)  or  the  sensor  return line (ckt #452) is open. Repair open.  Then  go  to  ENG5V-30. Go  to  ENG5V-3. The  engine  +5  volt  line  (ckt  #416) is  shorted  to  either  the  sensor return line (ckt #452) or to chassis ground.  Repair  short. Then  go  to  ENG5V-30. Go to ENG5V-3. A short exists between sockets where  less  than  10,000  ohms resistance  was  read.  Repair short.  Then  go  to  ENG5V-30. H-243