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 75 of 1417
TROUBLESHOOTING ABS WITHOUT DIAGNOSTIC TOOLS - Continued
STEP
11.
IS THE ABS SYSTEM GROUND OK?
a.
Hood raised & secured.
b.
Turn battery switch ON.
T0861DAA
CONTROL BOX
ABS POWER SUPPLY
CONNECTOR (WIRE #10)
GROMMET
FIREWALL
ABS GROUND
WIRE
CONTROL HARNESS
GROUND WIRE
LOCKWASHER
BOLT
TIEDOWN
STRAP
Figure 8.
ABS Power Supply Connection.
c.
Locate the ABS ground wire where it attaches to the lower, right corner of the vehicle control box.
d.
Locate and disconnect the #10 wire connector at the top of the vehicle control box near where the wiring
harness exits the cab though a grommet on the firewall.
e.
Connect multimeter red lead to wire #10 terminal. Refer to point to point schematics.
f.
Connect multimeter black lead to ABS ground wire.
g.
Meter reading should be between 21 and 24 VDC.
TM 9-2320-272-23-2
0156
0156-12
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