18

Excessive shift shock is given when upshifting and downshifting

DESCRIPTION

• Excessive shift shock is felt when depressing the accelerator pedal at upshifting.

• During cruising, excessive shift shock is felt when depressing the accelerator pedal at downshifting.

POSSIBLE CAUSE

• Shift shock may worsen when the fail-safe is operating. The shift shock may worsen if the APP sensor or turbine sensor malfunctions.

• Clutch slippage, burnt (C1 clutch, C2 clutch, C3 clutch, B1 brake, B2 brake, B3 brake, B4 brake)

• ATF level low

• Line pressure low, high

• Incorrect accelerator pedal position signal

• Turbine sensor malfunction

• Shift solenoid A malfunction

• Shift solenoid B malfunction

• Shift solenoid C malfunction

• Shift solenoid D malfunction

• Shift solenoid E malfunction

• Line pressure control solenoid malfunction

• TCC control solenoid malfunction

• Shift solenoid F malfunction

• Shift solenoid G malfunction

• Body ground and sensor ground malfunction

• Control valve body malfunction

• TCM malfunction

• AT internal malfunction

• TR switch malfunction

• Harness and/or connector malfunction

• Insufficient battery voltage

• Loose parts installation (engine or transmission mounts, suspension, propeller shaft)

• Poor hydraulic operation (Malfunction in position change)

STEP

INSPECTION

ACTION

1

• Inspect for continuity between the TCM terminal 1P, 1X and battery negative terminal.

• Is there continuity?

Yes

Go to the next step.

No

Repair or replace the suspected wiring harness.

2

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

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

  (See ON-BOARD DIAGNOSTIC SYSTEM PID/DATA MONITOR INSPECTION [TCM (SJ6A-EL)].)

PCM PIDs:

• APP

• TP_REL

TCM PIDs:

• SSA_CC

• SSB_CC

• SLT

• SSLU_C

• TSS

• OSS

• Are the PIDs value normal?

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

  (See ON-BOARD DIAGNOSTIC SYSTEM PID/DATA MONITOR INSPECTION [TCM (SJ6A-EL)].)

Yes

Go to the next step.

No

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

3

• Stop the engine.

• Inspect the following solenoid:

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

• Shift solenoid A

• Shift solenoid B

• Shift solenoid C

• Shift solenoid D

• Shift solenoid E

• Line pressure control solenoid malfunction

• TCC control solenoid malfunction

• Shift solenoid F

• Shift solenoid G

• 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].)

4

• 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].)