ARMY TM 9-6115-639-13 AIR FORCE TO 35C2-3-386-51 MARINE CORPS TM 10155A-13/1 Table 4-4.  Unit Level Troubleshooting (continued)       MALFUNCTION      TEST OR INSPECTION   CORRECTIVE ACTION 1.    ENGINE WILL NOT CRANK  (continued) g.  Check engine solenoid L4:      (1)  Connect positive (+) probe of multimeter to K2-A2.             (2)   Connect negative (-) probe of multimeter to TP31.       (3)  Continuity of approximately 1.4 ohms?   If not, remove and replace solenoid L4 in accordance with TM 9-2815-257-24. h.   Remove and replace engine starter motor in accordance with TM 9-2815-257-24. i. Refer trouble to direct support level maintenance. 2. ENGINE CRANKS BUT WILL NOT START a.  Check for clogged fuel filter / water separator element. Remove and replace filter / separator element (Para. 4-49). b.  Check that fuel pump assembly is operating when START / RUN / STOP switch is placed in               RUN position (audible sound). Remove and replace fuel pump assembly (Para. 4-42).   c.  Check diode CR2 as follows:      (1)   Connect positive (+) probe of multimeter to terminal board TB3, test point TP32.      (2)   Connect negative (-) probe to TB3, test point TP31.      (3)   Place START / RUN / STOP switch in RUN position.      (4)   20 to 32 VDC present? If not present, remove and replace diode (Para. 4-25). d.  Check fault lockout relay K12 as follows:      (1)  Connect positive (+) probe of multimeter to A5-F.      (2)  Connect negative (-) probe to terminal board TB3, test point TP31.      (3)  Place START / RUN / STOP switch in START position.      (4) 20 to 32 VDC present? If not present, remove and replace relay (Para. 4-24). e.  Check EMERGENCY STOP switch as follows:      (1)  Connect positive (+) probe of multimeter to S19-A2.      (2)  Connect negative (-) probe to terminal board TB3, test point TP31.      (3)  Place START / RUN / STOP switch in START position.      (4)  20 to 32 VDC present? If not present, remove and replace EMERGENCY STOP switch (Para. 4-20). 4-15     Change 1