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 855 of 1313
SYSTEM OPERATES INCORRECTLY IN ONE OR MORE POSITIONS OF DIRECTIONAL SIGNAL CONTROL
LEVER - Continued
STEP
3.
DO THE ELECTRICAL CONTACTS INSIDE THE DIRECTIONAL SIGNAL CONTROL UNIT WORK
PROPERLY WHEN IN "LEFT TURN" POSITION?
a.
Set control lever to "Left Turn" position.
T0784DAA
DIRECTIONAL SIGNAL CONTROL
LEVER IN “LEFT TURN” POSITION
TEST PROBE LEADS
BLACK (-)
H
H
H
H
F
D
D
B
C
A
E
G
E
C
SHORTED
SHORTED
OPEN
OPEN
OPEN
SHORTED
SHORTED
RED (+)
CONTINUITY
INDICATION
Figure 3.
Directional Signal Control Left Turn 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 "LEFT TURN" 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 (4).
STEP
4.
DO THE ELECTRICAL CONTACTS INSIDE THE DIRECTIONAL SIGNAL CONTROL UNIT WORK
PROPERLY WHEN IN "HAZARD WARNING" POSITION?
a.
Set control lever to "Hazard Warning" position.
TM 9-2320-272-23-1
0099
0099-4
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