No.11 Abnormal Shifting: Notes

WARNING: This page is about a different car, the 2005 Mazda RX-8. However, it is still accessible from the selected car via links, so may be relevant.

ABNORMAL SHIFTING DESCRIPTION AND POSSIBLE CAUSE

11	Abnormal shifting
DESCRIPTION	Shifts incorrectly (incorrect shift pattern).
POSSIBLE CAUSE	Improper adjustment of TR switch Transmission fixed in 3GR (fail-safe function) Input/output signal malfunction (VSS, TCC solenoid, shift solenoids A, B, C and F) Maximum speed is low or acceleration is poor because 3GR is fixed as a fail-safe. In such a case, DTC is stored. Improper TCM ground Transmission is mechanically fixed in 3GR if TCM stops operating due to improper TCM ground. In such a case DTC is not stored. Clutch spillage In the event of clutch slippage, a DTC (incorrect gear ratio) is output. Control valve body malfunction (improper operation, stuck, clogged oil passage) Hydraulic circuit clogging (TCC solenoid, shift solenoids A, B, C and F) Control valve spool malfunction Torque converter malfunction (TCC piston is cracking or peeling.) NOTE: Before following the troubleshooting steps, make sure that the Automatic Transmission On-Board Diagnostic and Automatic Transmission Basic Inspection are conducted. (See BASIC INSPECTION .)

Abnormal shifting

DESCRIPTION

Shifts incorrectly (incorrect shift pattern).

POSSIBLE CAUSE

Improper adjustment of TR switch
Transmission fixed in 3GR (fail-safe function)
- Input/output signal malfunction (VSS, TCC solenoid, shift solenoids A, B, C and F)
  - Maximum speed is low or acceleration is poor because 3GR is fixed as a fail-safe. In such a case, DTC is stored.
- Improper TCM ground
  - Transmission is mechanically fixed in 3GR if TCM stops operating due to improper TCM ground. In such a case DTC is not stored.
Clutch spillage
- In the event of clutch slippage, a DTC (incorrect gear ratio) is output.
Control valve body malfunction (improper operation, stuck, clogged oil passage)
- Hydraulic circuit clogging (TCC solenoid, shift solenoids A, B, C and F)
- Control valve spool malfunction
Torque converter malfunction (TCC piston is cracking or peeling.)
NOTE:
- Before following the troubleshooting steps, make sure that the Automatic Transmission On-Board Diagnostic and Automatic Transmission Basic Inspection are conducted. (See BASIC INSPECTION .)