LEMON Manuals: Even more car manuals for everyone
Home >> Plymouth >> 1983 >> Colt Custom, 2D Hatchback, Automatic >> Repair and Diagnosis >> Accessories & Equipment >> Cruise Control Systems >> Testing >> Valve Body Test

Valve Body Test

  1. Turn ignition on. Ground test light and touch terminals on the 5-wire connector 6" from valve body. The 2 White wires should show 12 volts. The Yellow, Brown and Blue wires should produce a dim light and a faint click should be heard when wires are touched.
  2. If no power is found at either wire, check brake switch and cruise control fuse. Fuse is the 3-amp fuse in cruise control wiring harness on Colt and Ram-50 pickups. Run engine long enough build up vacuum in reservoir. Shut off engine.
  3. Locate 5-wire connector and insert 3 short sections of solid wire into the back of connector so they contact terminals on the Blue, Brown/Yellow and Yellow wires. Connect jumper wires from the valve body bracket.
    NOTE: DO NOT  start engine with these jumper wires in place.
  4. Turn ignition on. The accelerator pedal should go to the floor and remain there at least 1 minute. If not, test vacuum supply and vacuum motor.
  5. Remove jumper wires. Start engine and check for vacuum supply to valve body by pulling the small hose off the vacuum reservoir. If there is adequate vacuum supply, turn off engine. Remove the small vacuum hose from the center of the valve body (labeled "SERVO") and apply a vacuum source to hose.
  6. The accelerator pedal should be pulled directly to the floor. If not, the hose to the vacuum motor has a leak or is pinched, or the vacuum motor has a leak or is jammed.
  7. If the valve body has adequate vacuum supply, 12 volts, and vacuum motor operates normally, but valve body will not operate the throttle when valves are grounded in step 3), replace valve body.
scientia non olet · About LEMON Manuals