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Using A Speedometer Tester

WARNING: This page is about a different car, the 2004 Mazda RX-8. However, it is still accessible from the selected car via links, so may be relevant.
  1. Adjust the tire pressure to the specification.
  2. Using a speedometer tester, verify that the tester reading is as indicated in the figure. See Fig 1 - Fig 2 .
    Fig 1: Speedometer Tester Indication & Allowable Range - KMPH
    G01344758Courtesy of MAZDA MOTORS CORP.
    Fig 2: Speedometer Tester Indication & Allowable Range - MPH
    G01344759Courtesy of MAZDA MOTORS CORP.
  3. Verify that the speedometer reading is within range.
    • If the speedometer does not move or the indication is not within the allowable range, inspect the ABS HU/CM (vehicles with ABS), DSC HU/CM (vehicles with DSC) and related wiring harnesses.
      • If the ABS HU/CM (vehicles with ABS), DSC HU/CM (vehicles with DSC) and related wiring harnesses are normal, replace the instrument cluster.
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