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, TP 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 throttle position signal • 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 GND and sensor GND 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 range change)

Diagnostic procedure

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 [L8, LF].) (See PID/DATA MONITOR INSPECTION [SJ6A-EL].) PCM PIDs: ― APP ― TP TCM PIDs: ― SSF ― SSG ― LPS ― TCC ― TSS ― OSS • Are the PIDs value normal? (See PCM INSPECTION [L8, LF].) (See PID/DATA MONITOR INSPECTION [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 • 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 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].)