TM-9-2330-334-13-P
FAMILY OF MEDIUM TACTICAL VEHICLES (FMTV) LOAD HANDLING SYSTEM TRAILER (LHST) M1147A1
TECHNICAL MANUAL; OPERATOR AND FIELD LEVEL MAINTENANCE MANUAL INCLUDING REPAIR PARTS AND SPECIAL TOOLS LIST (RPSTL)
DECEMBER 2013
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TM-9-2330-334-13-P - Page 64 of 1184
TM 9-2330-334-13&P
THEORY OF OPERATION – Continued
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ABS ECU
The ABS ECU is mounted towards the rear of the trailer right behind the rear air tank.
The ABS ECU
monitors and regulates release of air to the service brake air chambers using two relay valves that are
triggered when speed sensors (one on each wheel) detect trailer wheel lock-up. The relay valves
modulate the air supply by sending pulses of air. In between air pulses, the service brakes release,
thereby preventing wheel lock-up.
ABS ECU Valve Assembly
The ABS ECU valve assembly contains the two relay valves.
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