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Home >> Mazda >> 2005 >> 3 SP23, 4D Hatchback, Automatic >> Repair and Diagnosis >> Electrical >> Horns >> Instrumentation/Driver Info >> Instrument Cluster Inspection >> Speedometer >> Using a speedometer tester

Using a speedometer tester

  1. Adjust the tire pressure to the specification.
  2. Using a speedometer tester, verify that the tester reading is as indicated.
    SPEEDOMETER TEST SPECIFICATIONS - KM/H

    Speedometer tester indication (km/h) Allowable range (km/h)
    20 18-22
    40 38-41
    60 58-62
    80 78-82
    100 97-102
    120 117-122
    140 137-142
    SPEEDOMETER TEST SPECIFICATIONS - MPH

    Speedometer tester indication (mph) Allowable range (mph)
    20 11-13
    40 24-25
    60 36-38
    80 48-51
    100 61-63
    120 73-76
    140 85-88
  3. Verify that the speedometer reading is within the range indicated.
    • If the speedometer does not move or the indication is not within the allowable range, inspect the PCM and related wiring harnesses.
      • If the PCM and related wiring harnesses are normal, replace the instrument cluster.