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Tachometer Inaccurate (Beretta & Corsica)

  1. Disconnect Direct Ignition System (DIS) electrical connector. Plug IPC Tester (J-33431) into a wall outlet. Connect Harness Connector (J-33431-10) from tester to DIS connector terminal "F" (VIN A), "A" (VIN 4) or "C" (VIN T).
  2. Set tester controls to 60 HZ and 54 MPH. If tachometer indicates 1800 RPM (4-cylinder) or 1350 RPM (6-cylinder), check for clean and tight connections at DIS connector. If DIS connector is okay, replace DIS.
  3. If tachometer does not indicate 1800 RPM (4-cylinder) or 1350 RPM (6-cylinder), check DIS White wire for open circuit or a short to ground.
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