17

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

DESCRIPTION

• Strong shock is felt when shifting from N to D or N to R position 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 accelerator pedal position signal

• Incorrect engine speed signal

• Incorrect engine coolant temperature signal

• Incorrect brake switch signal

• Incorrect engine torque signal

• Incorrect turbine sensor signal (N→D)

• TFT sensor malfunction

• Sensor ground 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 position 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

STEP

INSPECTION

ACTION

1

• Does the shift shock occur only when the engine is cold?

Yes

Go to the next step.

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.

No

Repair or replace the malfunctioning part according to the inspection results.

3

• Perform the initial learning procedure.

  (See INITIAL LEARNING PROCEDURE [SJ6A-EL].)

• Does the symptom eliminate?

Yes

Symptom troubleshooting is completed.

No

Go to the next step.

4

• Is the line pressure normal?

  (See MECHANICAL SYSTEM TEST [SJ6A-EL].)

Yes

Go to the next step.

No

Repair or replace the malfunctioning part according to the inspection results.

5

• Is the stall speed normal?

  (See MECHANICAL SYSTEM TEST [SJ6A-EL].)

Yes

Go to the next step.

No

Repair or replace the malfunctioning part according to the inspection results.

6

• Access the following PCM PIDs using the M-MDS:

  (See ON-BOARD DIAGNOSTIC TEST [PCM (SKYACTIV-G 2.0)].)

• RPM

• APP

• TP_REL

• BOO

• ECT

• Are the PIDs value normal?

  (See PCM INSPECTION [SKYACTIV-G 2.0].)

Yes

Go to the next step.

No

Repair or replace the malfunctioning part according to the inspection results.

7

• Stop the engine.

• Inspect the following solenoids:

  (See SOLENOID VALVE INSPECTION [SJ6A-EL].)

• Line pressure control solenoid

• Shift solenoid A

• Shift solenoid F

• TCC control solenoid

• Are these solenoids normal?

Yes

Inspect the ATF condition.

• If a large amount of metal specks are found, overhaul the transmission and repair or replace any malfunctioning parts.

  (See AUTOMATIC TRANSMISSION REMOVAL/INSTALLATION [SJ6A-EL].)

  (See Automatic Transmission Workshop Manual [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].)

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 Bulletins and/or On-line Repair 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. (See TCM REMOVAL/INSTALLATION [SJ6A-EL].)