NO.17 EXCESSIVE SHIFT SHOCK FROM N TO D OR N TO R POSITION/RANGE [SJ6A-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 the 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. - Clutch burnt (N→D: C1 clutch, N→R: C3 clutch or B4 brake) • ATF level low • Line pressure low • Incorrect throttle position signal • Incorrect accelerator pedal position signal • Incorrect engine speed signal • Incorrect engine coolant temperature signal • Incorrect engine torque signal • Incorrect turbine sensor signal (N→D) • TFT sensor malfunction • Sensor GND malfunction • Shift solenoid A malfunction • Shift solenoid F malfunction • Line pressure control solenoid malfunction • TCC control solenoid malfunction (N→R) • Control valve body malfunction - Poor hydraulic operation (Malfunction in range change) - Idle speed high - Poor tightening torque of engine mount, exhaust mount, suspension, propeller shaft - Line pressure high - Insufficient battery voltage - Harness or connector malfunction - AT malfunction 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 [SJ6A-EL].)


STEP	INSPECTION		ACTION
1	• Does the shift shock occur only when the engine is cold?	Yes	Go to the next step.
1	• Does the shift shock occur only when the engine is cold?	No	Go to Step 3.
2	• Inspect the TFT sensor and related wiring harness: vibration, intermittent open/short circuit. (See TRANSMISSION FLUID TEMPERATURE (TFT) SENSOR INSPECTION [SJ6A-EL].) • Is it normal?	Yes	Go to the next step.
2		No	Repair or replace part if necessary.
3	• Perform the initial learning procedure. (See Initial Learning.) • Does symptom eliminate?	Yes	Troubleshooting is completed.
3		No	Go to the next step.
4	• Is the line pressure normal? (See Line Pressure Test.)	Yes	Go to the next step.
4	• Is the line pressure normal? (See Line Pressure Test.)	No	Repair or replace any malfunctioning parts according to the inspection results.
5	• Is stall speed normal? (See Stall Speed Test.)	Yes	Go to the next step.
5	• Is stall speed normal? (See Stall Speed Test.)	No	Repair or replace any malfunctioning parts according to the inspection results.
6	• Access the following PCM PIDs using the M-MDS. - RPM - APP - TP - ECT - ENG_TRQ • Are PIDs value normal?	Yes	Go to the next step.
6		No	Inspect and repair suspected PID related part.
7	• Stop the engine. • Inspect following solenoids. (See SOLENOID VALVE INSPECTION [SJ6A-EL].) - Line pressure control solenoid - Shift solenoid A - Shift solenoid F - TCC control solenoid • Are they normal?	Yes	Inspect the ATF condition. • If a large amount of metal specks are found, replace the transmission. (See AUTOMATIC TRANSMISSION REMOVAL/INSTALLATION [SJ6A-EL].) • If a large amount of metal specks are not found, replace the control valve body. (See CONTROL VALVE BODY REMOVAL [SJ6A-EL].) (See CONTROL VALVE BODY INSTALLATION [SJ6A-EL].)
7		No	• Replace the control valve body. (See CONTROL VALVE BODY REMOVAL [SJ6A-EL].) (See CONTROL VALVE BODY INSTALLATION [SJ6A-EL].)
8	• Verify test results. - If normal, return to the diagnostic index to service any additional symptoms. - If malfunction remains, inspect the related Service Information and perform repair or diagnosis. • If the vehicle is repaired, troubleshooting completed. • If the vehicle is not repaired or additional diagnostic information is not available, replace the TCM.

NO.17 EXCESSIVE SHIFT SHOCK FROM N TO D OR N TO R POSITION/RANGE [SJ6A-EL]

Initial Learning