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DECELERATION THROTTLE MODULATOR (DTM) SYSTEM
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TM-5-4210-230-14P-1 Aerial Ladder Fire Fighting Truck Manual
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Air Injection System Operation
ENGINE DIVISION SERVICE MANUAL TM 5-4210-230-14&P-1 Fig. 61  Modulator Test (5) If  modulator  is  improperly  adjusted,  loosen  lock  nut and adjust position of modulator. (6) Repeat   Steps   (3)   thru   (5)   until   proper   speed   is achieved; then tighten lock nut. (7) Reconnect proper vacuum hose to modulator. c. Perform DTM operational test as follows: (1) Verify modulator is retracted at idle. (2) Slowly accelerate the engine and observe the speed at  which  the  modulator  extends.    Modulator  should extend at 1850 + 50 RPM (Fig.  60). (3) Slowly decelerate the engine and observe the speed at  which  the  modulator  retracts.    Modulator  should retract at 1850 + 50 RPM (Fig.  60). d. Verify solenoid valve functions properly. (1) Operate engine at any condition. (2) With    wiring    harness    disconnected    from    solenoid valve, modulator must be in retracted position. Fig. 62  Jumper Wires from Battery to Solenoid Valve Terminals (3) With  jumper  wires  from  positive  terminal  of  battery and    from    ground    connected    to    solenoid    valve terminals  (Fig.    62),  modulator  must  be  in  extended position. (4) If   modulator   does   not   function   properly,   solenoid valve is faulty and must be replaced.  (The solenoid valve and speed sensor are sold as one assembly.) e. Verify speed sensor functions properly. (1) Disconnect  wiring  harness  from  solenoid  valve  and connect    a    12-volt    test    lamp    between    the    two terminals of the harness connector. Fig. 63  Speed Sensor Switch Test CGES-215  Page 36 PRINTED IN UNITED STATES OF AMERICA

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