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.
1		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.
2		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.
3		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].)
4	• Inspect the ATF condition. • Are a metal specks found?	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.

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)