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 154 of 1417

ABS - CODE SLW 43 (RIGHT SIDE - YELLOW CHANNEL) - Continued

CONDITION/INDICATION

IS MODULATOR VALVE FAULTY?

DECISION

YES - Replace rear relay valve (Volume 3, WP

0457). Go to Step (6) to verify problem is solved.

YES - Go to Step (4).

STEP

4.

IS PRIMARY AIR SYSTEM OPERATING PROPERLY?

Check for a primary air system fault. Refer to point to point schematics.

CONDITION/INDICATION

IS PRIMARY AIR SYSTEM OPERATING PROPERLY?

DECISION

NO - Perform semi-annual PMCS on air lines and brake chambers (WP

0207).

YES - Go to Step (6) to verify problem is solved.

STEP

5.

ARE BRAKES IN PROPER ADJUSTMENT AND WORKING ORDER?

Check brakes for mechanical or adjustment problems (Volume 3, WP

0432).

CONDITION/INDICATION

ARE BRAKES IN PROPER ADJUSTMENT AND WORKING ORDER?

DECISION

NO - Repair or adjust brakes as needed (Volume 3, WP

0432). Go to Step (6) to verify problem is solved.

YES - Notify supervisor. It is possible another troubleshooting work package applies.

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