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Home >> BMW >> 1979 >> 528i Automatic Trans >> Repair and Diagnosis >> Engine Performance >> Engine Control Systems >> Transmission Controlled Spark >> Testing >> Top Gear Switch
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Top Gear Switch

  1. With ignition switch in the "ON" position and engine stopped, shift transmission into 4th gear. Disconnect electrical connector from electromagnetic switching valve.
  2. Connect a test light to terminals of switching valve connector. Test light should come on when transmission is in 4th gear and go out when transmission is shifted out of 4th gear. If not, top gear switch is defective and should be replaced.
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