Mazda RX-8 Manual page 1111

NO.9 NO SHIFTING
9 No shifting
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DESCRIPTION
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POSSIBLE
CAUSE
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NOTE:
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Diagnostic procedure
STEP INSPECTION
Single shift range only.
Sometimes shifts correctly.
Clutch slippage (low clutch, high clutch)
In the event of clutch slippage, a DTC (incorrect gear ratio) is output.
Reduced line pressure
Transmission fixed in 3GR (operating fail-safe function)
Input/output signal malfunction (VSS, turbine sensor, shift solenoids A, B, C
and F, oil pressure switches B, C and F)
Maximum speed is low or acceleration is poor because transmission is
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fixed in 3GR as a fail-safe. In such a case, DTC is stored.
Improper TCM ground.
Transmission is mechanically fixed in 3GR if TCM stops operating
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due to Improper TCM ground. In such a case, DTC is not stored.
Transmission fixed in 1GR or 2GR
If VSS and turbine sensor malfunction simultaneously, transmission is fixed
in 2GR while D range or 1GR, 2GR of M range. In such a case, DTC is not
stored.
Incorrect characteristics of accelerator position sensor, accelerator position signal, TP
sensor, or throttle opening angle signal (CAN communication)
Accelerator position sensor, accelerator position signal, TP sensor and throttle
opening angle signal (CAN communication) do not change in proportion to
throttle opening angle. In such a case, high or low gear is fixed, resulting in
low maximum speed and poor acceleration. (Refer to improper accelerator
position sensor, accelerator position signal, TP sensor, or throttle opening
angle signal (CAN communication) in "No.11 Abnormal shifting".)
Control valve body malfunction (improper operation, stuck, clogged oil passage).
Hydraulic circuit clogging (Shift solenoids B, C and F).
Control valve spool malfunctions
Improper adjustment of TR switch
Torque converter malfunction (TCC piston is cracking or peeling.)
Before following the troubleshooting steps, make sure that the Automatic
Transmission On-Board Diagnostic and Automatic Transmission Basic Inspection
are conducted. (See BASIC INSPECTION .)
ACTION
(w) RX-8 Transmission (Manual & Auto)
Page 86