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Home >> Mercedes Benz >> 1974 >> 280 >> Repair and Diagnosis (Single Page) >> Engine Performance >> Engine Control Systems >> Exhaust Emissions System - Exhaust Gas RECIRCULATION >> Testing >> Vacuum Control/Throttle Lift >> 1975-76 230 Models
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1975-76 230 Models

  1. Check vacuum hose for damage and proper routing. Red vacuum hose should be attached to center connection of Grey switchover valve. The Gray/Purple vacuum hose should be connected between vacuum control and outer connection of switchover valve.
  2. To check switchover valve, disconnect relay box. Connect harness terminals No. 2 and 7 and turn ignition on. The Gray switchover valve should click. If vacuum hose and switchover valve are in good working order, replace relay box.
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