Mazda RX-8 Manual page 1114

NO.10 DOES NOT SHIFT TO 4GR
10 Does not shift to 4GR
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DESCRIPTION
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POSSIBLE
CAUSE
NOTE:
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Diagnostic procedure
STEP INSPECTION
With the ignition switch at the ON
position, does the gear position
1
indicator light indication correspond
to the selector lever position?
Inspect the voltages at the following
TCM terminals.
(See TCM INSPECTION .)
2
Terminals 2J and 2N (TFT
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sensor)
Are voltages normal?
3
Vehicle does not upshift from 3GR to 4GR even though vehicle speed is increased.
Vehicle does not shift to 4GR even though accelerator pedal is released in D range
at 60 km/h {37 mph} .
Oil temperature of TFT sensor is low (4GR is inhibited when temperature is 5 ° ° ° ° C
{41 ° ° ° ° F} or below .)
Improper adjustment of TR switch
Control valve body malfunction (improper operation, stuck, clogged oil passage)
Hydraulic circuit clogging (shift solenoid A)
Control valve spool malfunction
TFT sensor malfunction
Short or open circuit in wiring
Poor connection of connector
Sensor malfunction
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
Yes Go to the next step.
Go to No.29 "GEAR POSITION INDICATOR LIGHT
DOES NOT ILLUMINATE IN M RANGE", or No.30
No
"GEAR POSITION INDICATOR LIGHT ILLUMINATES
IN D RANGE OR P, N, R POSITIONS".
Yes Go to the next step.
No Repair or replace any malfunctioning parts.
Yes Go to the next step.
(w) RX-8 Transmission (Manual & Auto)
Page 89