NO.18 EXCESSIVE SHIFT SHOCK IS GIVEN WHEN UPSHIFTING AND DOWNSHIFTING [SJ6A-EL]

id050307802300

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)

Diagnostic procedure

STEP	INSPECTION		ACTION
1	• Inspect for continuity between the TCM terminal 2P, 2X and battery negative terminal. • Is there continuity?	Yes	Go to the next step.
1		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 1.5, 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 1.5, SKYACTIV-G 2.0].) (See ON-BOARD DIAGNOSTIC SYSTEM PID/DATA MONITOR INSPECTION [TCM (SJ6A-EL)].)	Yes	Go to the next step.
2		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].)
3		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 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].)

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)