NO.9 ABNORMAL SHIFTING [AY6A-EL, AY6AX-EL]

id0503k3801400

9 | Abnormal shifting
DESCRIPTION | • Shift incorrectly (incorrect shift pattern).
POSSIBLE CAUSE | • There is a malfunction in the signal circuit which controls shifting (Accelerator opening signal, input/turbine speed sensor, VSS), the control valve is stuck, or the clutch circuit is stuck. ― Clutch slippage, burnt (C1 clutch, C2 clutch, C3 clutch, B1 brake) • Line pressure low • Incorrect accelerator opening signal • VSS malfunction • Input/turbine speed sensor malfunction • Sensor ground 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 • Body ground malfunction • Control valve body malfunction ― Wheel speed signal malfunction • Tire of a different diameter from the standard tire is installed • ABS wheel-speed sensor malfunction Note • Before following the troubleshooting steps, make sure that the Automatic Transaxle On-Board Diagnostic and Automatic Transaxle Basic Inspection are conducted. (See BASIC INSPECTION [AY6A-EL, AY6AX-EL].) • If a tire of a different diameter from the standard tire is installed, the TCM determines that the driving mode is the AAS mode, and may change to a different shift timing from the normal timing.

Diagnostic procedure

STEP | INSPECTION | ACTION
--- | --- | ---
1 | • Inspect the tire size and air pressure. • Is the tire of specified size and air pressure? | Yes | Go to the next step.
No | Replace with a specified tire size or adjust the air pressure of each specified tire to the specified value.
2 | • Display the following DSC CM PIDs using the M-MDS. (See ON-BOARD DIAGNOSIS [DSC/RSC].) ― WSPD_LF ― WSPD_LR ― WSPD_RF ― WSPD_RR • Are the monitoring values displayed uniformly while driving? | Yes | Go to the next step.
No | Perform the following inspections: ABS wheel-speed sensor installation inspection ― Is the ABS wheel-speed sensor installation normal? ABS sensor rotor installation inspection ― Is the ABS sensor rotor installed twisted? (may cause output of abnormal wave pattern at high speeds.) ― Are there missing teeth on the sensor rotor? If there is any malfunction, repair or replace the malfunctioning location.
3 | • Inspect for continuity between the TCM terminal A9 and battery negative terminal. • Is there continuity? | Yes | Go to the next step.
No | Repair or replace ground circuit.
4 | • Inspect following shift solenoids. ― 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 (See LINE PRESSURE CONTROL SOLENOID INSPECTION [AY6A-EL, AY6AX-EL].) ― TCC control solenoid (See TORQUE CONVERTER CLUTCH (TCC) CONTROL SOLENOID INSPECTION [AY6A-EL, AY6AX-EL].) ― Shift solenoid F (See SHIFT SOLENOID F INSPECTION [AY6A-EL, AY6AX-EL].) • 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].)
5 | • Inspect the ATF condition. (SeeAUTOMATIC TRANSAXLE FLUID (ATF) INSPECTION [AY6A-EL, AY6AX-EL].) • Is the ATF condition normal? | Yes | Inspect the TCM terminal for bend, damage, corrosion or poor contact.
No | Replace the transaxle. (See AUTOMATIC TRANSAXLE REMOVAL/INSTALLATION [AY6A-EL, AY6AX-EL].)
6 | • 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.