M2/M3 BFV: TROUBLESHOOTING - OD1610 - LESSON 1/TASK 2
To perform these tests, the VTM can be connected to either DCA 3 or DCA 13.
Also, the vehicle should be parked with the engine off and the tracks
chocked.
(a) Engine RPM - Idle. Once the vehicle has been configured for
the testing, set the TEST SELECT switches to 10.
Then start the engine,
following the procedures contained on pages 2-144 thru 2-151 of TM 9-2350-
252-20-1-1.
After the engine has been started and warmed up, press and
release the TEST button.
Check the display to ensure that it reads between 775 and 825 rpm. If the
display reads between these two numbers, then test number 10 passed. If the
display reads 0 rpm or an erratic reading, go to the STE-M1/FVS (VTM only)
test number 10 engine rpm diagnostic troubleshooting procedures on page
3-920 of TM 9-2350-252-20-1-1.
If test number 10 passed, stop the engine
and return to the troubleshooting procedure that was being followed.
(b) Engine RPM - Governed Speed. To perform this procedure, first
set the TEST SELECT switches to 10.
Start the engine, following the
procedures contained on pages 2-144 through 2-151 of TM 9-2350-252-10-1.
Once the engine has been started and warmed up, following the above
mentioned reference, press and release the TEST button.
Now, depress the
accelerator pedal fully. The display should read between 2850 and 3050 rpm.
If this is indicated on the display, test number 10, testing the engine rpm
at the vehicle's governed speed, has been passed. If the display reads 0
rpm, or displays an erratic reading, turn to the STE-M1/FVS (VTM only) test
number 10 engine rpm diagnostic troubleshooting procedures on page 3-920 of
TM 9-2350-252-20-1-1.
If the proper indications were received, return to
the troubleshooting procedure that was being followed.
(2) VTM Test Number 38.
VTM test number 38 is used to test the
temperature of the engine coolant. To perform this procedure, first ensure
that the vehicle is parked with the engine off and the tracks chocked.
Once the above conditions have been met, connect the VTM to either DCA 3 or
DCA 13 and start the engine, following the procedures contained on pages 2-
144 through 2-151 of TM 9-2350-252-10-1.
After the engine has warmed up
sufficiently, set the TEST
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