Using a speedometer tester

WARNING: This page is about a different car, the 2003 Mazda 6. However, it is still accessible from the selected car via links, so may be relevant.

Adjust the tire air pressure to the specification.
Using a speedometer tester, verify that the speedometer indication is within the allowable ranges shown below.

Fig 1: Speedometer Tester Indication And Allowable Range Table (1 Of 2)
Courtesy of MAZDA MOTORS CORP.

Fig 2: Speedometer Tester Indication And Allowable Range Table (2 Of 2)
Courtesy of MAZDA MOTORS CORP.
Verify that fluctuation of the speedometer needle is within the allowable range.
- If the speedometer needle does not move or the indication is outside of the allowable range, inspect the PCM and related wiring harness.
  - If the PCM and related wiring harness are normal, replace the instrument cluster.
Needle fluctuation allowable range
1. Within 3.0 km/h