TM 5-3805-262-203-31. FUEL SYSTEM TROUBLESHOOTING (CONT)MALFUNCTIONTEST OR INSPECTIONCORRECTIVE ACTION1. LOW PURL PRESSURE (Cont).S t e p 8 . ( C o n t ).a .b .If VTM display indicates 3.2 to 9 psi, use compressed air toclear blockage from fuel supply hose. Disconnect transducercable W4 from pressure transducer. Remove pressure transducer,adapter, and street elbow from electric fuel pump port.Reinstall elbow and fuel supply hose between elbow and fuelinjection pump feed pump.If VTM display does not indicate 3.2 to 9 psi, go to step 9below.Step 9.Disconnect electric fuel pumpterminal from wiring harnessterminal. Do this by graspingterminals with your fingers andf i r m l y p u l l i n g a p a r t.Connect test probe cable W2 connec-tor P1 to VTM J4.Connect test probe cable W2 red testc l i p t o b l a c k t e s t c l i p .Dial 89 into TEST SELECT.Press and hold TEST until CAL ap-pears on display then release TEST.Wait for offset value to appear on display. Offset value should bebetween -6.8 to +6.8. If it is not, STE/ICE is defective (refer toTM 9-4910-571-12&P).C o n n e c t t e s t p r o b e c a b l e W 2 r e d t e s t c l i p t o w i r i n g h a r n e s s t e r m i n a land black test clip to loader frame.Tell assistant to turn ignition key switch to on position.Press and release TEST button.VTM display should indicate 24 volts.Tell assistant to turn ignition key switch to off position.Disconnect test probe cable W2 test clips.a . I f V T M d i s p l a y i n d i c a t e s 2 4 v o l t s , r e c o n n e c t e l e c t r i c f u e l p u mpterminal and wiring harness terminal. Do this by grasping termi-nals with fingers, alining, and firmly pushing together. Go tostep 10 below.b. If VTM display does not indicate 24 volts, check for open cir-cuit between wiring harness terminal and ignition key switch.Repair or replace wire as necessary (page 5-168 or 5-174).3-253
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