TM9-2320-360-20-3 Section   4 TROUBLESHOOTING   CHARTS STEP/SEQUENCE RESULT VEH5V-10  Check  ECM Connectors l Turn ignition off. Terminals  and connectors  are  okay. Problem  found. E.  VEH5V  -  VEHICLE  HARNESS  +5  VOLTS  SUPPLY  (CONT’D) l Disconnect the vehicle harness connector at the ECM (if not already    disconnected). l Check terminals at the vehicle harness   connector   (both the ECM and harness side) for damage;  bent,  corroded  and unseated  pins  or  sockets. Especially  terminals  #952,  #916, #417, and #510. Install new terminal  if  in  doubt. VEH5V-11  Check  for  Short  to Battery   + l Turn ignition off. l Disconnect batteries (para 7-61). l Disconnect the vehicle harness and  5-way  power  harness connectors  at  the  ECM. l Read resistance between sockets A3  and  B3  on  the  vehicle  harness connector. All  readings  are                   greater  than  10,000 ohms  or  open. Any  reading  is             less  than  10,000  ohms. l Also read resistance between socket  A3  on  the  vehicle  harness connector  and  the  following sockets on the 5-way power harness  connector:  A  and  C. VEH5V-12  Open  Check l Connect   TPS   connector. l Turn  ignition  on. l Read voltage on vernier control connector,  socket  C  (red  lead) and  a  good  battery  ground. l Repeat  above  only  place  red  lead is  socket  A  of  the  vernier  control connector. Both 4.7 to 5.2  volts. Pin  C  greater than  4.7  volts  and pin A is zero volts. WHAT   TO   DO   NEXT Replace  ECM  (para  7-29.1). Then  go  to  VEH5V-30. Repair  terminals/connectors  (para 7-77). Then go to VEH5V-30.   Go to VEH5V-10.    A short exists between the engine +5  volt  line  (ckt  #916)  and  the line(s)  where  less  than  10,000 ohms  was  read  (either:  ckt  #240, #241, or #439). Repair short. Then  go  to  VEH5V-30. -  Repair open from ckt #952 to ECM. (Look at ECM terminal.) Repair  open,  then  go  to  VEH5V-30. Go  to  VEH5V-7.