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 867 of 1313
PROTECTIVE CONTROL BOX ASSEMBLY TEST - Continued
STEP
9.
IS THERE CONTINUITY BETWEEN PROTECTIVE CONTROL BOX CONNECTOR B AND D, WHEN 24 VDC
IS APPLIED TO PIN E?
PROTECTIVE
CONTROL BOX
T1066DAA
PROTECTIVE
CONTROL BOX
PROTECTIVE
CONTROL
CONNECTOR
A
B
C
D
E
F
G
Figure 9.
Protective Control Box Connector.
a.
Disconnect 24 VDC from pin A.
b.
Apply 24 VDC to pin E.
c.
Connect multimeter red lead to protective control box connector pin B. Refer to point to point schematics.
d.
Connect multimeter black lead to protective control box connector pin D.
e.
Meter reading should be less than 20 ohms.
CONDITION/INDICATION
IS THERE CONTINUITY BETWEEN PROTECTIVE CONTROL BOX CONNECTOR B AND D, WHEN 24 VDC
IS APPLIED TO PIN E?
DECISION
NO - Replace protective control box (Volume 2, WP
0319). Go to Step (10) to verify problem is solved.
YES - Go to Step (10) to verify problem is solved.
TM 9-2320-272-23-1
0100
0100-10
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