NO.14 ENGINE FLARES UP OR SLIPS WHEN UPSHIFTING OR DOWNSHIFTING [AY6A-EL, AY6AX-EL]

id0503k3801900

14 | Engine flares up or slips when upshifting or downshifting
DESCRIPTION | • When the accelerator pedal is depressed for acceleration from standstill, engine speed increases but the vehicle speed increases slowly. • When the accelerator pedal is depressed while driving, engine speed increases but the vehicle speed does not.
POSSIBLE CAUSE | • There is clutch slippage because the clutch is stuck or the line pressure is low. ― Clutch stuck, slippage (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 • Not within ATF amount 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 | • Is the line pressure normal? (See MECHANICAL SYSTEM TEST [AY6A-EL, AY6AX-EL].) | Yes | Go to the next step.
No | Repair or replace any malfunctioning parts according to the inspection results.
2 | • Is shift point normal? (See ROAD TEST [AY6A-EL, AY6AX-EL].) | Yes | Go to the next step.
No | Go to No.9 “ABNORMAL SHIFTING”.
3 | • Inspect the coupler component for open or short. • Are coupler component normal? | Yes | Go to the next step.
No | Replace the coupler component.
4 | • Stop the engine. • Inspect following 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. • 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].)
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.