Mazda RX-8 Workshop Manual page 2079

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2011 - RX-8 - Transmission/Transaxle
NO.8 DOES NOT SHIFT TO 6GR [SJ6A-EL]
8 Does not shift to 6GR
DESCRIPTION
Vehicle does not upshift from 5GR to 6GR even though vehicle speed is
increased.
Vehicle does not shift to 6GR even though accelerator pedal is released in
D range at 80 km/h {50 mph}.
Basically, TCC does not operate when the fail-safe is operating. Verify the
DTC at first. If the TCC operates when driving at high speeds only, the
malfunction (improper adjustment) is in the M range switch circuit or TR
switch circuit.
CAUTION:
If the TCC is stuck, inspect it. In addition, inspect the oil
cooler for foreign particles which may have mixed in with
the ATF.
C2 clutch, C3 clutch, B2 brake slippage, burnt
TFT sensor malfunction
Line pressure low
Incorrect accelerator pedal position
signal
Incorrect engine speed signal
Incorrect engine coolant temperature
signal
Incorrect engine torque signal
VSS malfunction
Turbine sensor malfunction
Sensor GND malfunction