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 147 of 1417
ABS - CODE SLW 42 (LEFT SIDE - BLUE CHANNEL) - Continued
STEP
2.
IS FRONT RELAY VALVE CONTROL PORT OBSTRUCTED?
Check control port of the front relay valve for obstruction. Refer to point to point schematics.
T0847DAA
TOP VIEW
PORT #2 (DELIVERY)
ECU
PORT #1 (SUPPLY)
PORT #4 (CONTROL)
PORT #2 (DELIVERY)
Figure 1.
Front Relay Valve.
CONDITION/INDICATION
IS FRONT RELAY VALVE CONTROL PORT OBSTRUCTED?
DECISION
YES - Replace front relay valve (Volume 3, WP
0458). Go to Step (6) to verify problem is solved.
NO - Go to Step (3).
TM 9-2320-272-23-2
0168
0168-2
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