FixVault

No. 9 Abnormal Shifting: Notes

9 Abnormal shifting
DESCRIPTION 
  • Shifts incorrectly (incorrect shift pattern).
POSSIBLE CAUSE 
  • There is a malfunction in the signal circuit which controls shifting (APP sensor, input/turbine speed sensor, VSS), the control valve is stuck, the accumulator (forward or servo apply) is stuck, or the clutch circuit is stuck.
    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.
    1. Clutch slippage, burnt
      • Line pressure low
      • Control valve body 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
      • Pressure control solenoid B malfunction
      • Body GND malfunction
    2. Signal malfunctions
      • VSS malfunction
      • Sensor GND malfunction
      • APP sensor malfunction
      • Input/turbine speed sensor malfunction
    3. TR switch malfunction
      • Selector cable adjustment incorrect
      • TR switch adjustment incorrect
    4. Wheel speed signal malfunction
      • Tire of a different diameter from the standard tire is installed
      • ABS wheel-speed sensor malfunction
      NOTE: