NO.18 EXCESSIVE SHIFT SHOCK IS GIVEN WHEN UPSHIFTING AND DOWNSHIFTING [AY6A-EL, AY6AX-EL]

id0503k3802300

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 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, input/turbine speed sensor, or VSS signal malfunctions. ― Clutch slippage, burnt (C1 clutch, C2 clutch, C3 clutch, B1 brake) • Line pressure low, high • Incorrect accelerator opening signal • VSS malfunction • Input/turbine speed sensor malfunction • TFT sensor malfunction • Shift solenoid C malfunction • Shift solenoid D malfunction • Shift solenoid E malfunction • Line pressure control solenoid malfunction • Shift solenoid F malfunction • Body ground and sensor ground malfunction • Control valve body malfunction • Not within ATF amount ― Poor hydraulic operation (Malfunction in range change)

Diagnostic procedure

STEP | INSPECTION | ACTION
--- | --- | ---
1 | • Inspect for continuity between the TCM terminal A9 and battery negative terminal. • Is there continuity? | Yes | Go to the next step.
No | Repair open ground circuit.
2 | • Perform the PID/DATA Monitor Record Procedure and access following PCM and TCM PIDs while excessive shift shock condition. (See PCM INSPECTION [MZI-3.7].) (See ON-BOARD DIAGNOSTIC SYSTEM PID/DATA MONITOR INSPECTION [AY6A-EL, AY6AX-EL].) PCM PIDs: ― APP1 ― APP2 TCM PIDs: ― SSF ― LPS ― TSS ― OSS • Are they normal? | Yes | Go to the next step.
No | Repair or replace malfunctioning part according to inspection result.
3 | • Stop the engine. • Inspect the following solenoid. ― Shift solenoid C (See SHIFT SOLENOID C INSPECTION [AY6A-EL, AY6AX-EL].) ― Shift solenoid D (See SHIFT SOLENOID D INSPECTION [AY6A-EL, AY6AX-EL].) ― Shift solenoid E (See SHIFT SOLENOID E INSPECTION [AY6A-EL, AY6AX-EL].) ― Line pressure control solenoid • Are they normal? | Yes | Go to the next step.
No | Inspect the coupler component. If normal, replace the control valve body. (See CONTROL VALVE BODY REMOVAL/INSTALLATION [AY6A-EL, AY6AX-EL].)
4 | • Inspect the ATF condition. • Are a metal specks found? | Yes | If large amount of metal specks are found, replace the transaxle. (See AUTOMATIC TRANSAXLE REMOVAL/INSTALLATION [AY6A-EL, AY6AX-EL].) If a large amount of metal specks are not found, replace the control valve body. (See CONTROL VALVE BODY REMOVAL/INSTALLATION [AY6A-EL, AY6AX-EL].)
No | Perform the “AUTOMATIC TRANSAXLE FLUID (ATF) LEVEL ADJUSTMENT” procedure. (See AUTOMATIC TRANSAXLE FLUID (ATF) LEVEL ADJUSTMENT [AY6A-EL, AY6AX-EL].)
5 | • 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.