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Home >> Mazda >> 2018 >> MX-5 Miata Club, Automatic Trans >> Repair and Diagnosis >> Transmission >> Automatic Trans >> Symptom Troubleshooting - Transaxle >> No. 7 No Shifting >> Notes

No. 7 No Shifting: Notes

7 No shifting
DESCRIPTION
  • Single shift position only.
  • Sometimes it shifts correctly.
POSSIBLE CAUSE
  • When the gear position is fixed in 4GR due to the fail -safe operation, malfunction is in the AT.
    • Clutch burnt (C1 clutch, C2 clutch, C3 clutch, B1 brake, B2 brake, B3 brake, B4 brake)
  • 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 ground malfunction
  • Shift solenoid A malfunction
  • Shift solenoid B malfunction
  • Shift solenoid C malfunction
  • Shift solenoid D malfunction
  • Shift solenoid E malfunction
  • Shift solenoid F malfunction
  • Shift solenoid G malfunction
  • Line pressure control solenoid malfunction
    • Control valve body malfunction
    • 4GR is fixed (Operation in fail-safe function)
  • Short or open circuit in wiring harness
  • Poor connection of connector
  • Poor ground of shift solenoid
  • Malfunction of electronic parts of output and input system
    • TFT sensor malfunction
    • TR switch malfunction
    • TCM malfunction
    NOTE:
    • If a tire of a different diameter from the standard tire is installed, the TCM determines that the driving mode is the AAS mode, and may change to a different shift timing from the normal timing.