TM-9-2320-272-23-1
TRUCK, 5-TON, 6X6, M939, M939A1, AND M939A2 SERIES TRUCKS (DIESEL)
TECHNICAL MANUAL; FIELD MAINTENANCE MANUAL; VOLUME 1 OF 5
SEPTEMBER 2012
TM-9-2320-272-23-1 - Page 856 of 1313
SYSTEM OPERATES INCORRECTLY IN ONE OR MORE POSITIONS OF DIRECTIONAL SIGNAL CONTROL
LEVER - Continued
T0785DAA
DIRECTIONAL SIGNAL CONTROL LEVER
IN “HAZARD WARNING” POSITION
TEST PROBE LEADS
BLACK (-)
H
H
H
H
D
D
F
G
A
E
B
C
C
E
SHORTED
SHORTED
SHORTED
SHORTED
SHORTED
OPEN
OPEN
RED (+)
CONTINUITY
INDICATION
Figure 4.
Directional Signal Control Hazzard Position.
b.
Connect multimeter black lead to first location listed in graphic. Refer to point to point schematics.
c.
Connect multimeter red lead to first location listed in graphic.
d.
Note reading and compare to the first location listed under "Continuity Indication". Meter reading should
be greater than 10,000 ohms for open indication.
e.
Move black and red multimeter leads to each location listed in the graphic and compare the readings to
those listed under "Continuity Indication".
CONDITION/INDICATION
DO THE ELECTRICAL CONTACTS INSIDE THE DIRECTIONAL SIGNAL CONTROL UNIT WORK
PROPERLY WHEN IN "HAZARD WARNING" POSITION?
DECISION
NO - Replace directional signal control unit (Volume 2, WP
0317). Go to Step (5) to verify problem is solved.
YES - Go to Step (5) to verify problem is solved.
STEP
5.
IS YOUR ORIGINAL PROBLEM STILL PRESENT?
a.
Ensure vehicle is returned to normal operating condition.
b.
Check to see if your original problem still exists.
CONDITION/INDICATION
IS YOUR ORIGINAL PROBLEM STILL PRESENT?
DECISION
YES - Notify supervisor.
NO - Problem fixed.
END OF WORK PACKAGE
TM 9-2320-272-23-1
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