TM-9-2320-260-20
TRUCK, 5-TON, 6X6, M809 SERIES (DIESEL)
TECHNICAL MANUAL; UNIT MAINTENANCE
APRIL 1995
TM-9-2320-260-20 - Page 278 of 1337
TM 9-2320-260-20
2-20.
STE/lCE DESCRIPTION AND OPERATION (Contd)
Table 2-5. Status Readouts.
VTM Readout
Interpretation
.8.8.8.8
A readout of .8.8.8.8 appears for 1 to 2 seconds each time power is applied to VTM.
It means that there is power to the VTM, and all elements of readout display are
operative.
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A readout of four dashes indicates the following:
(1) After power is turned on, it signifies that VTM is ready for testing.
(2) During a compression unbalance test, it signifies testing is in progress.
(3) During battery condition test, it signifies battery maybe in discharged
state.
.9.9.9.9
A readout of .9.9.9.9 indicates that VTM is reading a test value beyond the range
of its measurement capability. Either (1) the wrong test number is selected for
parameter being measured; (2) there is a fault in vehicle, or (3) during battery
condition test, it signified bad connections, discharged, or bad batteries.
PASS
PASS or FAIL readout is the result of a test that checks the condition of a com-
FAIL
ponent being measured. A PASS/FAIL readout means component either passes the
test or fails the test.
AUE
A readout of AUE indicates to the technician the numerical readout is an average
value. AUE is displayed only when measuring vacuum variation and the variation
is less than one inch of mercury.
Table 2-6. Prompting Messages.
VTM Readout
Interpretation
UEH
Signal to technician to enter vehicle identification number (VID) on TEST SELECT
switches. Vehicle ID numbers are found under TEST DATA on flip cards, on vehicle
test card, and in appendix.
GO
Signal to technician to crank engine in compression unbalance or first peak tests.
During battery condition test, indicates a weak battery in series pair of batteries
being tested.
CIP
Signal to technician to apply full throttle in a CI power test.
OFF
Signal to technician to stop cranking in compression balance test.
CAL
Signal to the technician to release the TEST button during an offset test.
Numbers are used for prompting messages in several tests. They are as follows:
in confidence, test 66 signals the technician to dial in “99,” in CI acceleration/
deceleration power test No. 12, the first numerical readout signals the technician
to shut off fuel.
2-191
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