Using A Speedometer Tester

WARNING: This page is about a different car, the 2016 Mazda CX-5. However, it is still accessible from the selected car via links, so may be relevant.

CAUTION:

When only the front or the rear wheels are driven using a speedometer tester, the DSC HU/CM may determine that the vehicle speed signal is in error and the engine cannot be stopped by the normal operation. If the engine cannot be stopped, perform an emergency engine stop operation. (See SERVICE CAUTIONS .)

NOTE:

If a speedometer tester is unavailable and the M-MDS is used, perform the inspection following the procedure for the M-MDS.

Adjust the tire pressure to the specification.

Using a speedometer tester, verify that the tester reading is as indicated in the following chart. km/h

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
160	157-163
180	177-183
200	197-203
220	216-224
240	236-244

mph

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	68-72
80	78-82
90	88-92
100	98-102
110	108-112
120	118-122
130	128-132
140	138-142
150	148-152

Verify that the speedometer reading is within the range indicated in the chart.
- If the speedometer does not operate or the indication is not within the allowable range, inspect the DTC inspection for the following control module and the related wiring harnesses.
  - PCM
  - TCM (ATX)
  - DSC HU/CM
- If the PCM, TCM (ATX), DSC HU/CM, and related wiring harnesses are normal, replace the instrument cluster.