NO.14 ENGINE FLARES UP OR SLIPS WHEN UPSHIFTING OR DOWNSHIFTING [SJ6A-EL]


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, B2 brake, B3 brake) • Line pressure low • Incorrect throttle position signal • Incorrect accelerator pedal position signal • Incorrect engine speed signal • Incorrect engine coolant temperature signal • Incorrect engine torque signal • VSS malfunction • Turbine sensor malfunction • Sensor GND 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 • TCC control solenoid malfunction • Shift solenoid F malfunction • Shift solenoid G malfunction • Body GND malfunction • Control valve body malfunction Note • Before following the troubleshooting steps, make sure that the Automatic Transmission On-Board Diagnostic and Automatic Transmission Basic Inspection are conducted. (See BASIC INSPECTION [SJ6A-EL].)


STEP	INSPECTION		ACTION
1	• Is the line pressure normal? (See Line Pressure Test.)	Yes	Go to the next step.
1	• Is the line pressure normal? (See Line Pressure Test.)	No	Repair or replace any malfunctioning parts according to the inspection results.
2	• Is shift point normal? (See ROAD TEST [SJ6A-EL].)	Yes	Go to the next step.
2	• Is shift point normal? (See ROAD TEST [SJ6A-EL].)	No	Go to No.9 "ABNORMAL SHIFTING".
3	• Access the following PCM PIDs using the M-MDS. - RPM - APP - TP - ECT - ENG_TRQ • Are PIDs value normal?	Yes	Go to the next step.
3		No	Inspect and repair suspected PID related part.
4	• Stop the engine. • Inspect following solenoids. (See SOLENOID VALVE INSPECTION [SJ6A-EL].) - Shift solenoid A - Shift solenoid B - Shift solenoid C - Shift solenoid D - Shift solenoid E - Line pressure control solenoid - TCC control solenoid - Shift solenoid F - Shift solenoid G • Are they normal?	Yes	Inspect the ATF condition. • If a large amount of metal specks are found, replace the transmission. (See AUTOMATIC TRANSMISSION REMOVAL/INSTALLATION [SJ6A-EL].) • If a large amount of metal specks are not found, replace the control valve body. (See CONTROL VALVE BODY REMOVAL [SJ6A-EL].) (See CONTROL VALVE BODY INSTALLATION [SJ6A-EL].)
4		No	Replace the control valve body. (See CONTROL VALVE BODY REMOVAL [SJ6A-EL].) (See CONTROL VALVE BODY INSTALLATION [SJ6A-EL].)
5	• Inspect the coupler component for open or short. • Are coupler component normal?	Yes	Go to the next step.
5		No	Replace the coupler component.
6	• Inspect the ATF condition. • Are a large amount of specks found?	Yes	Replace the transmission. (See AUTOMATIC TRANSMISSION REMOVAL/INSTALLATION [SJ6A-EL].)
6		No	Replace the control valve body. (See CONTROL VALVE BODY REMOVAL [SJ6A-EL].) (See CONTROL VALVE BODY INSTALLATION [SJ6A-EL].)
7	• 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.