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Home >> Cadillac >> 1990 >> Seville Base, 440T4/ME9 >> Repair and Diagnosis >> Engine Performance >> System >> Engine Controls - System/Component Tests >> Air Injection >> Pressure Operated ELEC. Divert/ELEC. Switching (PEDES)

Pressure Operated ELEC. Divert/ELEC. Switching (PEDES)

  1. When engine is cold, port solenoid should be energized, allowing airflow to exhaust ports.
  2. When engine is warming up, port switch should be de-energized (off) and converter solenoid should be energized, forcing airflow past the converter valve to the catalytic converter.
  3. On the divert mode, both solenoids are de-energized, which opens the converter valve, allowing air out to divert/relief tube to atmosphere. If valves are not operating as specified, check circuit to solenoids. Repair or replace components as necessary.
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