TM 5-3805-262-20
3-34. BATTERY SYSTEM TROUBLESHOOTING (CONT)
MALFUNCTION
TEST OR INSPECTION
CORRECTIVE ACTION
2. BATTERIES DISCHARGED OR DO NOT MAINTAIN CHARGE (Cont).
S t e p 1 . ( C o n t ).
When UEH appears on display, dial 22 into TEST SELECT.
Press and release TEST button.
Check that VTM displays 22. If 22 is not displayed, STE/ICE is de-
fective (refer to TM 9-4910-571-12&P).
Connect transducer cable W4 connector P1 to VTM J2.
Connect transducer cable W4 connector P2 to current probe (TK item
11),
Clamp current probe around battery positive cable with current probe
arrow pointing away from battery. Be sure current probe is closed.
Shut off fuel by pulling fuel SHUT OFF control out.
NOTE
While cranking engine with bad or discharged batteries, VTM may lose
power and come on again after cranking has stopped, displaying -----. If
this happens, turn off VTM power, and clean battery posts and clamps and
try again. If VTM still loses power, connect VTM to another vehicle’s
battery (refer to TM 9-4910-571-12&P). Connect test probe cable W2 to
VTM J4 and red test clip to loader battery positive post and black test
c l i p t o l o a d e r b a t t e r y n e g a t i v e p o s t . Y o u w i l l h a v e t o e n t e r V I D a n d
condition current probe again.
Crank engine
s i t i o n.
Dial 75 into
for 5 seconds then turn ignition key switch to off po-
TEST SELECT.
NOTE
Dial 79 into TEST SELECT if VTM is not powered by loader batteries.
Press and hold TEST button until CAL appears on VTM display then re-
lease TEST button.
Wait for offset value to appear on display. Offset value should be
between -225 to +225. If it is not, STE/ICE is defective (refer to
TM 9-4910-571-12&P).
Press and release TEST button.
Wait for GO to appear on display.
When GO appears, crank engine until OFF or an error message is dis-
p l a y e d.
Turn ignition key switch to off position.
a. If VTM display is less than (TBD) milliohms/second (battery re-
sistance change), go to step 2 below.
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