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 158 of 1417
ABS - CODE BUHd 62 (LEFT SIDE - BLUE CHANNEL) - Continued
c.
Disconnect solenoid connector at front relay valve.
d.
Set multimeter to measure resistance.
e.
Connect multimeter red lead to solenoid connector bottom terminal. Refer to point to point schematics.
f.
Connect multimeter black lead to solenoid connector other bottom terminal.
g.
Meter reading should be between 30 and 36 ohms. Note reading.
h.
Repeat measurements between solenoid connector top solenoid and each of the bottom terminals.
i.
Meter reading should be 16 ohms. Note readings.
CONDITION/INDICATION
DOES AN OPEN CIRCUIT EXIST IN THE LEFT (BLUE), HOLD SOLENOID OR CABLE?
DECISION
YES - Replace front relay valve (Volume 3, WP
0458). Go to Step (4) to verify problem is solved.
NO - Go to Step (2).
STEP
2.
IS THE HOLD SOLENOID CABLE CONNECTOR DAMAGED OR CORRODED?
a.
Ensure battery and start switches are in the OFF position.
T0858DAA
SOLENOID CONNECTOR TERMINALS
Figure 2.
Front Relay Valve Solenoid Connector.
b.
Check hold solenoid cable connector female terminals for excessive pin spread or corrosion. Refer to
point to point schematics.
CONDITION/INDICATION
IS THE HOLD SOLENOID CABLE CONNECTOR DAMAGED OR CORRODED?
DECISION
YES - Replace ABS wiring harness (Volume 3, WP
0467). Go to Step (4) to verify problem is solved.
NO - Go to Step (3).
TM 9-2320-272-23-2
0170
0170-3
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