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Home › Cadillac › 1977 › Seville › Repair and Diagnosis › Electrical › Body Electrical › Electronic Cruise Control › Testing › Vacuum Control And Servo Solenoid Valves › Functional Test (Engine Running)

Functional Test (Engine Running)

  1. Before starting engine, disconnect bead chain or cable from servo and disconnect harness connectors at both valves. Start engine and run at idle speed.
  2. Ground one terminal of vacuum control valve. Connect a jumper wire to battery positive post. Touch battery jumper to ungrounded terminal. Servo diaphragm should not move. If it does, servo solenoid valve is leaking and must be replaced.
  3. Remove jumper wires from control valve and test servo solenoid valve in same way as above. If servo diaphragm moves, control valve is leaking and must be replaced.
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