Mazda RX-8 Workshop Manual page 4109

Speedometer tester indication (mph)Allowable range (mph)
3. 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, ABS HU/CM (vehicles with ABS), DSC HU/CM (vehicles
with DSC) and related wiring harnesses.
Tachometer
Using the input/output check mode
1. Inspect the tachometer by setting it to check code 13 of the input/output check mode. (See
INSTRUMENT CLUSTER INPUT/OUTPUT CHECK
Using M-MDS
CAUTION:
If the engine speed exceeds the allowable range, the engine could be damaged.Therefore,
10
20
30
40
50
70
80
If the ABS HU/CM (vehicles with ABS), DSC HU/CM (vehicles
with DSC) and related wiring harnesses are normal, replace the
instrument cluster.
9—11
19—21
29—31
39—41
49—51
69—71
78—82
MODE.)