TM 5-3805-262-20
3-30. ENGINE TROUBLESHOOTING (CONT)
MALFUNCTION
TEST OR INSPECTION
CORRECTIVE ACTION
7. EXCESSIVE OIL CONSUMPTION (Cont).
Step 6.
If VID has not been entered in VTM, dial 60 into TEST SELECT and
press and release TEST, When UEH appears on VTM display, dial 22
into TEST SELECT and press and release TEST.
Perform compression unbalance test:
NOTE
Be sure batteries are at full charge. Don't do more than two compression
unbalance tests in a row as loader batteries may discharge.
Check that fuel SHUT OFF control is pulled completely out.
Crank engine for five seconds to clear fuel from cylinders .
Set VTM TEST SELECT switches to 14.
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, clean battery posts and clamps and try again. If VTM still
l o s e s p o w e r,
connect VTM to another vehicle-s battery. Connect P1 of
test probe cable W2 to J4 of VTM and W2 black test clip to loader bat-
t e r y n e g a t i v e p o s t a n d r e d t e s t c l i p t o l o a d e r b a t t e r y p o s i t i v e p o s t.
Then set VTM TEST SELECT switches to 15.
Press and release TEST.
When GO appears on display, crank engine until OFF or E013 appears
on display. Be sure to return ignition key switch to off position.
Display should indicate (TBD).
a. If display indicates (TBD), compression unbalance is okay.
Notify next higher maintenance level (additional tests must be
performed).
b. If display indicates a number higher than (TBD), notify next
higher maintenance level (additional tests must be performed).
c. If FAIL is displayed, compression is too far unbalanced to be
measured using STE/ICE. Notify next higher maintenance level
(additional tests must be performed).
d. If GO appears, repeat this step.
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