TM 5-6115-434-12 Table 3-3.  Troubleshooting Malfunction Probable cause Corrective action 1 Fuel boost pump and a.  Improper starting procedure a.  Review preparation for motor assembly fail starting procedure (para to run. 2-14a). b.  Check specific gravity of electrolyte (para 2-1b (1) (c)).  Recharge or re- place batteries as indicated or utilize external power source (para 2-3b(4)). c.  Battery cables corroded or c.  Connect battery cables (para disconnected. 2-1b(f)).  Clean battery cables (para 2-1b(1), (e)). Install new batteries as indicated (para 2-1b(2)). d.  Low or depleted fuel supply d.  Replenish fuel supply. e.  Circuit breaker (CB1) e.  Reset (press) circuit breaker. tripped or failed. Replace failed circuit break- er (para 3-55). f.  Improper electrical connec- f.  Tighten or replace connec- tions to fuel boost pump tions to fuel boost pump motor assembly. motor assembly. g.  Master switch (S1) failed g.  Check for continuity between switch poles with power supply off and switch on. If no continuity replace failed master switch (S1) (para 3-55d). h.  Fuel boost pump switch h.  Replace failed fuel boost (S8) failed. pump switch (S8) (para 3-55d). i.  Air intake door switch (S4) i.  Check for sticking actuator. failed. Replace failed air intake door switch (S4). j.  Shunt (R1) failed. j.  Replace failed shunt (R1) (para 3-61l). k.  Diode (CR7) failed k.  Replace failed diode (CR7). l.  Fuel boost pump motor as- l.  Replace failed fuel boost sembly (B2) failed. pump and motor assembly (B2) (para 3-21). m.  Other causes m.  Refer other causes to direct and general support main- tenance personnel. 2 No response when mas- a.  Improper starting procedure a.  Review preparation for ter switch (S1) placed starting procedure (para in START position. 2-14a). b.  Low charged batteries b.  Check specific gravity of electrolyte (para 2-1b(1), (c)).  Recharge or replace batteries as indicated or utilize external power source (para 2-3b(4)). c.  Battery cables corroded or c.  Connect battery cables (para disconnected. 2-1 b (f)).  Clean battery cables (para 2-1b(1) (e)). Install new batteries as indicated (para 2-1b(2)). 3-6