No.19 Excessive Shift Shock From N To D Or N To R Position/Range: 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.

EXCESSIVE SHIFT SHOCK FROM N TO D OR N TO R POSITION/RANGE DESCRIPTION AND POSSIBLE CAUSE

19	Excessive shift shock from N to D or N to R position/range
DESCRIPTION	Strong shock felt when shifting from N to D or N to R position/range.
POSSIBLE CAUSE	Idle speed high. Poor hydraulic operation (range change malfunction) Improper adjustment of TR switch Poor tightening torque of engine mount, exhaust mount, PPF, and/or differential mount Suspension looseness Clutch burned Line pressure low/high Input/output signal malfunction (VSS, turbine sensor, TR switch, CAN communication signals (engine speed, throttle opening angle, engine torque), TFT sensor, pressure control solenoid, shift solenoids A and F) Control valve body malfunction (improper operation of accumulator, stuck accumulator) Hydraulic circuit clogging (Pressure control solenoid, shift solenoids A and F) Control valve spool malfunction Improper operation of accumulators (Low clutch solenoid, low and reverse clutch solenoid) Improper TCM ground Improper ground of GND return line at AT If there is improper ground of GND return line, clutch pressure may decrease, causing clutch slippage. 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 .)

Excessive shift shock from N to D or N to R position/range

DESCRIPTION

Strong shock felt when shifting from N to D or N to R position/range.

POSSIBLE CAUSE

Idle speed high.
Poor hydraulic operation (range change malfunction)
- Improper adjustment of TR switch
Poor tightening torque of engine mount, exhaust mount, PPF, and/or differential mount
Suspension looseness
Clutch burned
Line pressure low/high
Input/output signal malfunction (VSS, turbine sensor, TR switch, CAN communication signals (engine speed, throttle opening angle, engine torque), TFT sensor, pressure control solenoid, shift solenoids A and F)
Control valve body malfunction (improper operation of accumulator, stuck accumulator)
- Hydraulic circuit clogging (Pressure control solenoid, shift solenoids A and F)
- Control valve spool malfunction
- Improper operation of accumulators (Low clutch solenoid, low and reverse clutch solenoid)
Improper TCM ground
Improper ground of GND return line at AT
- If there is improper ground of GND return line, clutch pressure may decrease, causing clutch slippage.
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 .)