TROUBLESHOOTING THE HMMWV - OD1616 - LESSON 2/TASK 1
o Status Readout.
This type of readout keeps the mechanic
informed of what is happening such as power applied, failed test,
etc.
o Numerical Readout.
This type of readout is the measured value
in units of the measurement being made.
If you are measuring 0-45
volts dc, the number 24 on the display would indicate 24 Volts.
o Error Readout.
This type of readout indicates that the wrong
test number was selected, the transducer is not connected, or the VTM
is faulty.
(e) Flip Cards.
The flip cards list the 2-digit test number
system for selecting various tests.
The cards also summarize the
test and operating instructions contained therein.
(f) Power/DCA Connector J1.
Connector J1 connects the VTM to
either a vehicle diagnostic connector using the DCA cable, or to the
vehicle batteries using the power cable. Operating power and signals
from the installed transducers are supplied to the VTM through the
DCA cable.
(g) Transducer Cable Connectors J2,J3.
Connector J2 or J3
connects the VTM to any transducer in the transducer kit. Operating
power is supplied to the transducer and signals from the transducers
are supplied to the VTM through the cable. Connectors J2 and J3 are
identical and can be interchanged or used in combination.
(h) Test Probe Cable Connector J4.
Connector J4 connects the
test leads to the VTM when doing manual voltage and resistance tests.
(3) Readouts.
The following paragraphs describe the different
types of readouts that can occur during testing.
(a) Status Readout.
A status readout keeps the mechanic
informed of what is happening.
For example, .8.8.8.8 is displayed
each time the power switch is pushed on.
It means that power is
applied, and that all elements of the display are operative.
It
changes to four dashes (- - - -) 1.5 seconds later, indicating that
the VTM is ready to be used for testing. The status readout displays
are shown in table 2 on the following page.
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