(1) Vehicle test meter (VTM). The VTM is the diagnostic meter of STE/ICE-R used for testing electrical and
mechanical components of the M113A2, M577A2, M106A2, M125A2, M741A1, M901A1, or M1059
engine. The VTM consists of 3 switches, a readout display, flip cards and 4 cable connectors.
(a) Switches. The three switches are a PUSH ON/PULL OFF switch, TEST SELECT switch and TEST
button. The PUSH ON/PULL OFF switch is used to control power to the VTM from the power source.
The TEST SELECT switch are two ten-position switches used to select the test to be performed. The
TEST button has two functions: (1) when pressed and rebased it initiates selected test; (2) pressed
and held it initiates an offset test.
(b) Readout display. The readout display gives five different types of messages during testing and up to a
maximum of four characters per message. The types of messages are:
l confidence test error
Readout display messages can be found on page 3-3.
(c) Flip cards. The flip cards, attached to the front of the VTM, provide a quick but limited reference for
the operator. These flip cards list test numbers, messages, and some procedures. Test limits are also
provided for some vehicles.