Using a speedometer tester

WARNING: This page is about a different car, the 2005 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.

INSTRUMENT CLUSTER REFERENCE CHART

Speedometer tester indication (km/h)	Allowable range (km/h)
20	18-22
40	38-42
60	58-62
80	78-82
100	98-102
120	117-123
140	137-143

SPEEDOMETER TESTER INDICATION DESCRIPTION

Speedometer tester indication (mph)	Allowable range (mph)
10	9-11
20	19-21
30	29-31
40	39-41
50	49-51
60	59-61
70	69-71
80	78-82

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, ABS HU/CM (vehicles with ABS), VSS (vehicles without ABS) and related wiring harnesses.
- If the PCM, ABS HU/CM (vehicles with ABS), VSS (vehicles without ABS) and related wiring harnesses are normal, replace the instrument cluster.
Needle fluctuation allowable range

Within 3.0 km/h