NO.9 ABNORMAL SHIFTING [AW6A-EL, AW6AX-EL]

NO.9 ABNORMAL SHIFTING [AW6A-EL, AW6AX-EL]SM2445402

id050310801400

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 GND 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 GND malfunction

• Coupler component 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 [AW6A-EL, AW6AX-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	Verify tire condition. • Inspect the tire size and air pressure. • Is the tire of specified size and air pressure?	Yes	Go to the next step.
1		No	Replace with a specified tire size or adjust the air pressure of each specified tire to the specified value.
2	Inspect the vehicle wheel-speed signal. • Display the following ABS CM DSC CM PIDs using the M-MDS. (See ON-BOARD DIAGNOSIS.) ― WSPD_LF ― WSPD_LR ― WSPD_RF ― WSPD_RR • Are the monitoring values displayed uniformly while driving?	Yes	Go to the next step.
2		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.
3		No	Repair or replace ground circuit.
4	• Inspect following shift solenoids. (See SOLENOID VALVE INSPECTION [AW6A-EL, AW6AX-EL].) ― Shift solenoid C ― Shift solenoid D ― Shift solenoid E ― Line pressure control solenoid ― TCC control solenoid ― Shift solenoid F • Are they normal?	Yes	Inspect the TCM terminal for bend, damage, corrosion or poor contact.
4		No	Inspect the coupler component. If normal, replace the control valve body. (See CONTROL VALVE BODY REMOVAL/INSTALLATION [AW6A-EL, AW6AX-EL].)
5	• 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.