M2/M3 BFV: TROUBLESHOOTING - OD1610 - LESSON 1/TASK 2
this is not displayed, refer to TM 9-4910-751-14-1.
Assuming that the
display did show VEH ID, set the TEST SELECT switches to 16, then press and
release the TEST button. Now set the TEST SELECT switches to 61 and again
press and release the TEST button. If 16 does not flash on the VTM display,
refer to TM 9-4910-751-14-1.
Bear in mind that the procedures are only
performed when the VTM is connected to DCA 3.
Now dial 62 into the TEST SELECT switches and press and release the TEST
button. If the DCA to which the VTM is connected does not appear on the VTM
display, refer to TM 9-4910-751-14-1. From this point on, proceed with the
troubleshooting procedures cited in TM 9-2350-252-20-1-1.
(2) Hook Up VTM to DCA 13.
The procedures for hooking up the VTM
(W1P2) to DCA 13 (1A1J15) are exactly the same as for DCA 3.
difference is the location of DCA 13, which is located to the immediate
right of DCA 3. The other difference is that with the VTM connected to DCA
13, the procedures for entering the VEH ID do not have to be repeated.
Now that we know what the VTM is and how to hook it up to the BFV, let's
cover some of the test procedures that it is capable of performing.
b. VTM Test Procedures.
The VTM can perform fifteen different test
routines on the BFV. Some of these test routines can be used to test for
two different aspects of vehicle operation. An example is test number 10.
Test number 10 can be used to test the engine rpm at idle and also the
engine rpm at the governed speed of the vehicle. Table 1 (on the following
page) lists the test numbers and the tasks that these numbers test.
In the paragraphs that follow, we will select several of these tests and
discuss the procedures for performing these tests.
(1) VTM Test Number 10.
In this paragraph, we will discuss the
procedures for performing test number 10 to test the engine rpm at idle, and
also to test the engine rpm at the governed speed of the vehicle.