NO.17 EXCESSIVE SHIFT SHOCK FROM N TO D OR N TO R POSITION/RANGE [JA5A-EL]


17	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 at idle.
POSSIBLE CAUSE	• Shift shock may worsen when fail-safe is operating. If no DTC is output, the shift shock may worsen due to poor operation of the control valve body or sticking of the clutch. 1. Clutch burned (N→D: Low clutch, N→R: Reverse clutch or low and reverse brake) • Line pressure low • Incorrect throttle position signal • TFT sensor malfunction • Sensor GND malfunction • Throttle cable mis-adjustment • Control valve body malfunction 2. Poor hydraulic operation (Malfunction in range change) 3. Idle speed high 4. Poor tightening torque of engine mount, exhaust mount 5. Line pressure high Note • Before following the troubleshooting steps, make sure that the Automatic Transaxle On-Board Diagnostic and Automatic Transaxle Basic Inspection are conducted.


STEP	INSPECTION		ACTION
1	Does the shift shock occur only when engine cold?	Yes	Go to the next step.
1	Does the shift shock occur only when engine cold?	No	Go to Step 3.
2	Inspect the TFT sensor and related harness: vibration, intermittent open/short circuit. Is it normal?	Yes	Go to the next step.
2		No	Repair or replace part if necessary.
3	Is the line pressure normal? (See Line Pressure Test.)	Yes	Go to the next step.
3	Is the line pressure normal? (See Line Pressure Test.)	No	Repair or replace any malfunctioning parts according to the inspection results.
4	Is the stall speed normal? (See Stall Speed Test.)	Yes	Go to the next step.
4	Is the stall speed normal? (See Stall Speed Test.)	No	Go to Step 6.
5	Inspect the TR switch and related harness: vibration, intermittent open/short circuit. Is it normal?	Yes	Go to the next step.
5		No	Repair or replace part if necessary.
6	Stop the engine and turn the ignition switch to the ON position. Inspect the pressure control solenoid circuit. Is it normal?	Yes	Overhaul the control valve body and repair or replace any malfunctioning parts. (See ATX Workshop Manual.) If any problem remains, replace or overhaul the transaxle and repair or replace any malfunctioning parts. (See AUTOMATIC TRANSAXLE REMOVAL/INSTALLATION [JA5A-EL].) (See ATX Workshop Manual.)
6		No	Inspect for stuck pressure control solenoid. (See SOLENOID VALVE INSPECTION [JA5A-EL].)
7	• Verify the test results. - If normal, return to the diagnostic index to service any additional symptoms. - If the malfunction remains, inspect the related Service Bulletins and/or On-line Repair Information and perform repair or diagnosis. • If the vehicle is repaired, troubleshooting is completed. • If the vehicle is not repaired or additional diagnostic information is not available, replace the TCM.