LEMON Manuals: Even more car manuals for everyone: 1960-2025
Home >> Mercedes Benz >> 1974 >> 280 >> Repair and Diagnosis >> Engine Performance >> Engine Control Systems >> Exhaust Emissions System - Exhaust Gas RECIRCULATION >> Testing >> Vacuum Control/Throttle Lift >> 1975-76 230 Models
April 5, 2026: LEMON Manuals is launched! Read the announcement.

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.
scientia non olet · About LEMON Manuals