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Home >> Jeep >> 1974 >> Cherokee Base, 5.9L Eng VIN N, AWD >> Repair and Diagnosis >> Engine Mechanical >> Auxiliary Emission Control Systems >> Transmission Controlled Spark (TCS) System >> Adjustment >> Solenoid Control Switch

Solenoid Control Switch

  1. Disconnect switch wire from terminal and connect a 12 volt test lamp in series between switch wire and terminal.
  2. Raise and support vehicle so rear wheels are free to rotate, apply brakes and start engine. Test lamp should come ON.
  3. Place transmission in "D" position, release brakes and gradually depress accelerator pedal. Observe speedometer and test lamp. At a speed of 33-37 MPH, switch should open and test lamp go OFF.
  4. Adjust switch opening speed to 35 MPH if test lamp goes OFF at speed outside of 33-37 MPH. Turn Allen head adjusting screw, located in switch terminal, clockwise to increase speed and counterclockwise to decrease speed.
    NOTE: If equipped with thermal vacuum switch (TVS), intake manifold vacuum is applied to distributor when engine coolant temperature reaches 225°F.
    Fig 1: SOLENOID CONTROL SWITCH ADJUSTMENT
    G09340589Courtesy of AMERICAN MOTORS/RENAULT CORP.
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