TM9-2320-360-20-3 Section  4 TROUBLESHOOTING CHARTS E.   FLASH   CODE: 46 J1587 CODE: P168  1  -  BATTERY  VOLTAGE  LOW 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. STEP/SEQUENCE 46-1 Battery   Check l Start  and  run  (TM  9-2320-380-10) engine  for  1  minute. l Measure  voltage  on  Battery  + terminal  (red  lead)  to  Battery  - terminal  (black  lead). 46-2 Voltage Check at ECM l Keep  engine  running. l Select  ECM  VOLTS on  DDR  for  display. l Observe  ECM  voltage  reading  on DDR. 46-3 Voltage  Check  at  ECM l Turn  ignition  off. l Disconnect   5-way   power harness  connector  at  the  ECM. l Read voltage from socket A and C of 5-way power harness connector  and  a  good  battery ground  (black  lead).  Don’t  use (ckt  #150)  as  ground  reference. RESULT Engine  does  not  start. Less  than  or equal  to  10.0  volts. Greater  than 10.0 volts. Less  than  or equal  to  10.0  volts. Greater  than 10.0 volts. Less  than  or equal to 11.5 volts. Greater  than 11.5   volts. WHAT  TO  DO  NEXT Determine  cause  for  no-start. Start  with  an  inspection  of  the battery  (possibly  discharged) and/or   starting/charging   system. Refer to Chart 2, page H-43, as a further  aid  in  no-Start  diagnosis if  battery  and  starting/charging system  are  okay. Service  discharged  battery (TM  9-6140-200-14)  and/or starting/charging    system. H-217