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 865 of 1313
PROTECTIVE CONTROL BOX ASSEMBLY TEST - Continued
STEP
7.
IS THERE NO CONTINUITY BETWEEN PROTECTIVE CONTROL BOX CONNECTOR PINS D AND
GROUND?
PROTECTIVE
CONTROL BOX
T1066DAA
PROTECTIVE
CONTROL BOX
PROTECTIVE
CONTROL
CONNECTOR
A
B
C
D
E
F
G
Figure 7.
Protective Control Box Connector.
a.
Connect multimeter red lead to protective control box connector pin D. Refer to point to point schematics.
b.
Connect multimeter black lead to chassis ground.
c.
Meter reading should be about 1,000 ohms.
CONDITION/INDICATION
IS THERE NO CONTINUITY BETWEEN PROTECTIVE CONTROL BOX CONNECTOR PINS D AND
GROUND?
DECISION
NO - Replace protective control box (Volume 2, WP
0319). Go to Step (10) to verify problem is solved.
YES - Go to Step (8).
STEP
8.
IS THERE CONTINUITY BETWEEN PROTECTIVE CONTROL BOX CONNECTOR C AND D AND NO
CONTINUITY BETWEEN B AND D, WHEN 24 VDC IS APPLIED TO PIN A?
TM 9-2320-272-23-1
0100
0100-8
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