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Home >> Porsche >> 1981 >> 928 Automatic Trans >> Repair and Diagnosis >> Electrical >> Motors, Switches, Relays >> Switches, Gauges & Instrument Panels >> Testing >> Electronic Speedometer Sending Unit

Electronic Speedometer Sending Unit

  1. Locate connector for speedometer pickup. On 911SC models, it is beneath an access cover on the tunnel between the rear seats. Connect a test buzzer or voltmeter across the 2 wires.
  2. Lift vehicle and rotate right rear wheel, while holding left rear wheel. Buzzer should sound 8 times for each 2 revolutions of the wheel. If vehicle has a limited slip differential, buzzer should sound 8 times for every 1 revolution of the rear wheel. If not, replace sending unit.
  3. Make and break the wire connections (between sender and speedometer) as rapidly as possible. Speedometer needle should fluctuate. If not, replace speedometer assembly.
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