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 67 of 1417
TROUBLESHOOTING ABS WITHOUT DIAGNOSTIC TOOLS - Continued
STEP
3.
IS THE ABS WIRING HARNESS 28-PIN CONNECTOR OK?
a.
Ensure battery and start switches are in the OFF position.
T0853DAA
SENSOR 2A HI
SENSOR 2B LOW
NOT USED
NOT USED
NOT USED
BLUE (LEFT) SOLENOID COMMON
YELLOW (RIGHT) SOLENOID HOLD
YELLOW (RIGHT) SOLENOID COMMON
NOT USED
NOT USED
LAMP-
B- GROUND
NOT USED
DDU B-
DIAGNOSTIC OUTPUT
DDU B+
20
21
11
10
1
2
12
13
22
23
14
4
3
5
15
24
25
16
6
7
17
26
27
18
8
9
19
28
DIAGNOSTIC INPUT
LAMP +
YELLOW (RIGHT) SOLENOID DUMP
BLUE (LEFT) SOLENOID HOLD
BLUE (LEFT) SOLENOID DUMP
SENSOR 2B HI
SENSOR 2A LOW
B+ PERM
NOT USED
NOT USED
NOT USED
IGNITION SWITCHED B+
Figure 3.
ABS Wiring Harness 28-pin ECU Connector.
b.
Disconnect main 28-pin connector at ECU (Volume 3, WP
0452).
c.
Inspect 28-pin connector for bent or damaged pins or corrosion. Refer to point to point schematics.
TM 9-2320-272-23-2
0156
0156-4
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