TM 10-3930-671-24 CHAPTER 4 DIRECT SUPPORT/GENERAL SUPPORT TROUBLESHOOTING 4-1. TROUBLESHOOTING INTRODUCTION. This section contains step-by-step procedures for identifying, locating, and isolating equipment malfunctions. 4-2. TROUBLESHOOTING SYMPTOMS. Table  4-1  lists  the  most  common  malfunctions  found  during  operation  of  the  truck.    Tests  or  inspections  and  corrective actions  should  be  performed  in  the  order  listed.    Table  4-2  lists  corrective  actions  that  can  be  performed  by  DS/GS maintenance.  If a malfunction is not listed, or corrective action fails to correct a problem, notify your supervisor. 4-3.  DS/GS TROUBLESHOOTING PROCEDURES. Table  4-2  contains  the  malfunctions  listed  in  DS/GS  Troubleshooting  Symptom  Index  (Table  4-1),  test  or  inspection instructions  required  to  determine  cause  of  malfunction,  and  corrective  actions  for  repairing  the  faulty  equipment.    Unit Troubleshooting Procedures (Table 2-2) should be completed before performing DS/GS Troubleshooting Procedures. Table 4-1.  DS/GS Troubleshooting Symptom Index Troubleshooting Fault Page ENGINE 1 Engine will not start............................................................................................................................. 4-2 2 Engine does not run evenly................................................................................................................. 4-2 3 A loss of power ................................................................................................................................... 4-2 4 Oil consumption above normal ........................................................................................................... 4-3 5 Black exhaust smoke .......................................................................................................................... 4-3 6 White exhaust smoke  ......................................................................................................................... 4-4 7 Truck slow to accelerate ..................................................................................................................... 4-5 8 Engine knocking  ................................................................................................................................. 4-5 4-1