TM-9-2320-272-23-2

TRUCK, 5-TON, 6X6, M939, M939A1, AND M939A2 SERIES TRUCKS (DIESEL)

TECHNICAL MANUAL; FIELD MAINTENANCE MANUAL; VOLUME 2 OF 5

SEPTEMBER 2012

  TM-9-2320-272-23-2 - Page 257 of 1417

G01: VTM CONNECTION AND CHECKOUT (Part 1) - Continued
STEP
6.
Rerun confidence test.
a.
Pull OFF power switch.
b.
Push ON VTM power switch.
c.
Check that display indicates .8.8.8.8 for approximately 2 seconds and then change to – – – –.
T0002DAA
AFTER 2 SECONDS
Figure 5.
VTM Display.
d.
Re-Dial 66 and press and release TEST.
e.
Check if VTM display and hold 0066.
CONDITION/INDICATION
Does VTM display and hold 0066?
DECISION
YES - Go to Step (7).
NO - STE-ICE is faulty, notify supervisor.
STEP
7.
Run test 99.
NOTE
During the test, several numbers will appear on display. Wait for display of PASS.
VTM can fail Confidence Test if bad transducer is connected to it. If VTM fails Confidence
Test when powered by W1 (DCA mode), remove all cables from VTM and connect W5,
then clip W5 to vehicle batteries. If it passes Confidence Test this way, there is a bad
transducer in the vehicle DCA. If it fails, VTM has failed internally.
a.
Dial 99 into TEST SELECT and press and release TEST.
TM 9-2320-272-23-2
0188
0188-6


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