MAINTENANCE OF M939 SERIES VEHICLES - OD1661 - LESSON 1/TASK 2
STE/ICE is already properly connected. The procedures for connecting
the STE/ICE can be found in chapter 2, section VI of TM 9-2320-272-
(1) No-Go Test 20. Once the test set has been properly connected,
SGT Elliott attempts to crank the engine. At the conclusion of this
test procedure she is asked if the starter motor sounded as if it was
running overspeed? Since it was not, she is directed to No-Go test
80, which tests the starter circuit.
No-Go Test 80.
The first thing that SGT Elliott is directed to do is to
install the current probe.
This is done by installing the current
probe around the positive cable connected to the starter.
probe is installed, she points the arrow on the probe toward the
Make sure the current probe is closed.
Step 2. Once the probe has been installed, SGT Elliott is directed
to perform the current probe offset. This is done by turning off all
vehicle electrical power, then dialing 74 into the TEST SELECT
Now she presses and holds the TEST button until the CAL
message appears on the display.
At this point SGT Elliott releases
the TEST button.
She then waits for the display to indicate the
offset, which should be between -225 and +225. Since the offset was
within these limits, SGT Elliott is directed to proceed to the next
Step 3. The next procedure that SGT Elliott performs is to turn the
After this has been done, she presses the TEST button.
When the word GO appears on the display, she attempts to crank the
engine. When the vehicle test meter (VTM) displays the word OFF or
an error message, SGT Elliott stops cranking the engine.
point in the test procedure SGT Elliott is asked if a number is
displayed. The answer to this question is no, the word GO is still