No.20 Excessive Shift Shock Is Felt When Upshifting And Downshifting: Notes

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EXCESSIVE SHIFT SHOCK IS FELT WHEN UPSHIFTING AND DOWNSHIFTING DESCRIPTION AND POSSIBLE CAUSE

20	Excessive shift shock is felt when upshifting and downshifting
DESCRIPTION	Excessive shift shock is felt when depressing accelerator pedal at upshifting. During cruising, excessive shift shock is felt when depressing accelerator pedal at downshifting.
POSSIBLE CAUSE	Clutch slippage (low clutch, high clutch) In the event of clutch slippage, a DTC (incorrect gear ratio) is output. Reduced line pressure Input/output signal malfunction (VSS, turbine sensor, throttle opening angle (CAN communication), TFT sensor, pressure control solenoid, shift solenoids A, B, C and F, oil pressure switches B, C and F). Control valve body malfunction (improper operation, stuck, clogged oil passage) Hydraulic circuit clogging (Pressure control solenoid, shift solenoids B, C and F) Control valve spool malfunction Improper operation of accumulator (Low solenoid, 2-4 brake solenoid, high clutch solenoid, low and reverse brake solenoid, 2-4 brake, high clutch) Improper TCM ground Improper ground of GND return line in AT If there is improper ground of GND return line, clutch pressure may decrease, causing clutch slippage. NOTE: The malfunction is basically the same as for No.16 "ENGINE FLARES UP OR SLIPS WHEN UPSHIFTING OR DOWNSHIFTING". Before following the troubleshooting steps, make sure that the Automatic Transmission On-Board Diagnostic and Automatic Transmission Basic Inspection are conducted. (See BASIC INSPECTION .)

Excessive shift shock is felt when upshifting and downshifting

DESCRIPTION

Excessive shift shock is felt when depressing accelerator pedal at upshifting. During cruising, excessive shift shock is felt when depressing accelerator pedal at downshifting.

POSSIBLE CAUSE

Clutch slippage (low clutch, high clutch)
- In the event of clutch slippage, a DTC (incorrect gear ratio) is output.
Reduced line pressure
Input/output signal malfunction (VSS, turbine sensor, throttle opening angle (CAN communication), TFT sensor, pressure control solenoid, shift solenoids A, B, C and F, oil pressure switches B, C and F).
Control valve body malfunction (improper operation, stuck, clogged oil passage)
- Hydraulic circuit clogging (Pressure control solenoid, shift solenoids B, C and F)
- Control valve spool malfunction
- Improper operation of accumulator (Low solenoid, 2-4 brake solenoid, high clutch solenoid, low and reverse brake solenoid, 2-4 brake, high clutch)
Improper TCM ground
Improper ground of GND return line in AT
- If there is improper ground of GND return line, clutch pressure may decrease, causing clutch slippage.
NOTE:
- The malfunction is basically the same as for No.16 "ENGINE FLARES UP OR SLIPS WHEN UPSHIFTING OR DOWNSHIFTING".
- Before following the troubleshooting steps, make sure that the Automatic Transmission On-Board Diagnostic and Automatic Transmission Basic Inspection are conducted. (See BASIC INSPECTION .)