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 72 of 1417
TROUBLESHOOTING ABS WITHOUT DIAGNOSTIC TOOLS - Continued
STEP
7.
ARE ALL UNDER DASH ABS HARNESS CONNECTIONS OK?
a.
Ensure battery and start switches are in the OFF position.
b.
Using point to point schematics, locate the nine (four connecting to the ABS warning lamp and five
connecting to the ABS wiring harness) and verify all connections are correct and sound.
CONDITION/INDICATION
ARE ALL UNDER DASH ABS HARNESS CONNECTIONS OK?
DECISION
NO - Replace ABS wiring harness (Volume 3, WP
0467). Go to Step (15) to verify problem is solved.
YES - Go to Step (8).
STEP
8.
IS CIRCUIT #54 FROM THE START SWITCH OK?
a.
Ensure battery and start switches are in the OFF position.
b.
Using point to point schematics, locate the circuit #54 wire and jumper ("Y" lead connector contains the
3 amp fuse) from the start switch, and verify that all connections are sound.
CONDITION/INDICATION
IS CIRCUIT #54 FROM THE START SWITCH OK?
DECISION
NO - Repair or replace "Y" lead connector wire harness and 3 amp fuse (Volume 3, WP
0463). Go to Step (15)
to verify problem is solved.
YES - Go to Step (9).
TM 9-2320-272-23-2
0156
0156-9
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