NO.14 ENGINE FLARES UP OR SLIPS WHEN UPSHIFTING OR DOWNSHIFTING (GENERAL (L.H.D.) SPECS. SPORT AT) [FN4A-EL]


14	Engine flares up or slips when upshifting or downshifting
DESCRIPTION	• When accelerator pedal is depressed for driveway, engine speed increases but vehicle speed increases slowly. • When accelerator pedal is depressed while driving, engine speed increases but vehicle speed does not.
POSSIBLE CAUSE	• There is clutch slip because clutch is stuck or line pressure is low. 1. Clutch stuck, slippage (forward clutch, 3-4 clutch, 2-4 brake band, one-way clutch) • Line pressure low • Shift solenoid D malfunction • Shift solenoid E malfunction • Shift solenoid A malfunction • Shift solenoid B malfunction • Shift solenoid C malfunction • Pressure control solenoid malfunction • Body GND malfunction • Control valve body malfunction 2. Signal malfunction • Vehicle speed sensor malfunction • Sensor GND malfunction • TP sensor malfunction or misadjustment • Accelerator pedal position sensor malfunction or misadjustment • Input/turbine speed sensor malfunction 3. Poor operation of mechanical pressure • Selector lever position disparity • TR switch position disparity Note • Before following troubleshooting steps, make sure that Automatic Transaxle On-Board Diagnostic and Automatic Transaxle Basic Inspection are conducted. (See BASIC INSPECTION (GENERAL (L.H.D.) SPECS. SPORT AT) [FN4A-EL].)


STEP	INSPECTION		ACTION
1	Is shift point okay?	Yes	Go to next step.
1	Is shift point okay?	No	Go to No.9 "ABNORMAL SHIFTING".
2	Check the value at the following PCM PIDs using the WDS or equivalent. • APP1 • APP2 • TP_REL Are PIDs values okay?	Yes	Go to next step.
2		No	Repair or replace any defective parts.
3	Disconnect TCM. Is resistance between ground terminal 1P or 1O at TCM connector and body ground less than 5.0 ohms?	Yes	Go to next step.
3		No	Repair harness. Reconnect TCM.
4	Inspect pressure control solenoid circuit. Is it okay?	Yes	Overhaul control valve body and repair or replace any defective parts. (See ATX Workshop Manual (FN4A-EL).) If problem remains, overhaul transaxle and repair or replace any defective parts. (See ATX Workshop Manual (FN4A-EL).)
4	Inspect pressure control solenoid circuit. Is it okay?	No	Repair or replace any defective parts.
5	• Verify test results. - If okay, return to diagnostic index to service any additional symptoms. - If malfunction remains, inspect related Service Bulletins and/or On-line Repair Information and perform repair or diagnosis. • If vehicle repaired, troubleshooting completed. • If vehicle not repaired or additional diagnostic information not available, replace TCM.