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.
1		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.
2		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.
3		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.
4		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].)
5	• 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].)
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.