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Home >> Mercedes Benz >> 1990 >> 560SEC >> Repair and Diagnosis >> Accessories & Equipment >> Gauges & Instrument Panels >> Testing >> Electronic Speedometer Test

Electronic Speedometer Test

  1. Remove sender screw and pull unit from transmission tail housing. Turn ignition on. Place a large screwdriver blade across sender tip.
  2. Move blade quickly off and on sender. Speedometer needle should move slightly. If needle does not move, remove instrument cluster and unplug connector at back of cluster.
  3. Connect negative lead of voltmeter to pin No. 3 and positive lead to pin No. 5. Repeat steps 1) and 2). If voltage is indicated, speedometer is defective. If there is no voltage, replace sender and harness.
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