NO.14 ENGINE FLARES UP OR SLIPS WHEN UPSHIFTING OR DOWNSHIFTING [AW6A-EL, AW6AX-EL]

id050310801900

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

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].)

Diagnostic procedure

STEP	INSPECTION		ACTION
1	• Is the line pressure normal? (See MECHANICAL SYSTEM TEST [AW6A-EL, AW6AX-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 [AW6A-EL, AW6AX-EL].)	Yes	Go to the next step.
2		No	Go to No.9 “ABNORMAL SHIFTING”. (See NO.9 ABNORMAL SHIFTING [AW6A-EL, AW6AX-EL].)
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. (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	Go to the next step.
4		No	Replace the control valve body. (See CONTROL VALVE BODY REMOVAL/INSTALLATION [AW6A-EL, AW6AX-EL].)
5	• Inspect the ATF condition. • Are a large amount of specks found?	Yes	If large amount of metal specks are found, overhaul the transaxle and repair or replace any malfunctioning parts. (See Automatic Transaxle and Transfer Workshop Manual AW6A-EL AW6AX-EL.)
5		No	Replace the control valve body. (See CONTROL VALVE BODY REMOVAL/INSTALLATION [AW6A-EL, AW6AX-EL].)
6	• Verify test results. ― If normal, return to the diagnostic index to service any additional symptoms. ― If the 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.