Using a speedometer tester

WARNING: This page is about a different car, the 2004 Mazda 3. However, it is still accessible from the selected car via links, so may be relevant.

Adjust the tire pressure to the specification.
Using a speedometer tester, verify that the tester reading is as indicated in the table below.

Fig 1: Speedometer Test Allowable Range Table - KM/H
Courtesy of MAZDA MOTORS CORP.

Fig 2: Speedometer Test Allowable Range Table - MPH
Courtesy of MAZDA MOTORS CORP.
Verify that the speedometer reading is within the range indicated in the table.
- 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.