Mazda RX-8 Workshop Manual page 3274

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2011 - RX-8 - Body and Accessories
NO. 7 SPEEDOMETER INDICATION IS DEFECTIVE [INSTRUMENT CLUSTER]
7 Speedometer indication is defective
POSSIBLE CAUSE
Diagnostic procedure
STEP
1 Start the engine, and drive the vehicle.
2 Does the tachometer, the water temperature
gauge, operate normally?
3 Start the instrument cluster input/output check
mode.
Inspect the speedometer using the check code
Instrument cluster malfunction
Short circuit in wiring harness between CAN-L, CAN-H and GND
Open circuit in CAN wiring harness (CAN-L, CAN-H)
CAN wiring harness (CAN-L, CAN-H) short each other
ABS HU/CM or DSC HU/CM malfunction
PCM malfunction
Connector or pin malfunction
INSPECTION
Does the speedometer move
smoothly?
Does the speedometer indicate
correct speed?
ACTION
YesTroubleshooting completed.
No Go to the next step.
YesGo to the next step.
No Go to Step 5.
YesGo to the next step.
No Replace the instrument cluster.