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 76 of 1417
TROUBLESHOOTING ABS WITHOUT DIAGNOSTIC TOOLS - Continued
CONDITION/INDICATION
IS THE ABS SYSTEM GROUND OK?
DECISION
NO - Repair or replace ABS ground jumper wire (Volume 3, WP
0465). Go to Step (15) to verify problem is
solved.
YES - Go to Step (12).
STEP
12.
IS THE 3 AMP FUSE OK?
a.
Turn battery switch ON.
b.
Turn start switch to RUN.
c.
Locate the yellow conductor wire from the ABS harness under the vehicle dash.
d.
Disconnect the jumper lead from the yellow wire.
e.
Connect multimeter red lead to jumper lead terminal. Refer to point to point schematics.
f.
Connect multimeter black lead to a known good ground.
g.
Meter reading should be between 21 and 24 VDC.
CONDITION/INDICATION
IS THE 3 AMP FUSE OK?
DECISION
NO - Repair or replace 3 amp fuse or jumper wire (Volume 3, WP
0463). Go to Step (15) to verify problem is
solved.
YES - Go to Step (13).
TM 9-2320-272-23-2
0156
0156-13
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