NO.6 LOW MAXIMUM SPEED AND POOR ACCELERATION [AY6A-EL, AY6AX-EL]

id0503k3801100

6 | Low maximum speed and poor acceleration
DESCRIPTION | • Vehicle acceleration is poor at start. • Delayed acceleration when accelerator pedal is depressed while driving.
POSSIBLE CAUSE | • If the clutch is stuck or does not stay in 4GR, malfunction is in engine circuit. ― 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 A malfunction • Shift solenoid B malfunction • Shift solenoid C malfunction • Shift solenoid D malfunction • Shift solenoid E malfunction • Line pressure control solenoid malfunction • Shift solenoid F malfunction • Body ground malfunction • Control valve body malfunction ― Transaxle fixed in 3GR or 5GR* (Operation of fail-safe function) • Short or open circuit in wiring harness • Poor connection of connector • Malfunction of electronic parts of output and input system ― Insufficient starting torque (Suspected when in-gear, shift control and engine circuit are normal) • Torque converter malfunction (Poor operation, stuck) 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].)

Diagnostic procedure

STEP | INSPECTION | ACTION
--- | --- | ---
1 | • With the ignition switch at the ON position, does the gear position indicator light indication correspond to the selector lever position? | Yes | Go to the next step.
No | Go to No.27 “GEAR POSITION INDICATOR LIGHT DOES NOT ILLUMINATE IN D OR M POSITION”, or No.28 “GGEAR POSITION INDICATOR LIGHT ILLUMINATE IN P, R OR N POSITION”.
2 | • Go to No.12 “LACK/LOSS OF POWER (ACCELERATION/CRUISE)”. (See NO.12 LACK/LOSS OF POWER-ACCELERATION/CRUISE [MZI-3.7].) • Does engine control system normal? | Yes | Go to the next step.
No | Repair or replace any malfunctioning parts according to the inspection results.
3 | • Stop the engine. • Inspect following solenoid. ― Shift solenoid A (See SHIFT SOLENOID A INSPECTION [AY6A-EL, AY6AX-EL].) ― Shift solenoid B (See SHIFT SOLENOID B INSPECTION [AY6A-EL, AY6AX-EL].) ― 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].) ― Shift solenoid F (See SHIFT SOLENOID F INSPECTION [AY6A-EL, AY6AX-EL].) ― Line pressure control solenoid (See LINE PRESSURE CONTROL SOLENOID 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].)
4 | • Perform the stall test. (See MECHANICAL SYSTEM TEST [AY6A-EL, AY6AX-EL].) • Is the stall speed within the specified? | Yes | Inspect the ATF condition. 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 | Replace the torque converter. (See TORQUE CONVERTER REMOVAL/INSTALLATION [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.

* :If case of shift solenoid C failure