NO.14 ENGINE FLARES UP OR SLIPS WHEN UPSHIFTING OR DOWNSHIFTING (EXCEPT FOR 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 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 • Accelerator cable misadjustment • Control valve body malfunction 2. Signal malfunction • Vehicle speed sensor malfunction • Sensor GND malfunction • TP sensor malfunction or mis-adjustment • 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.


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 PID using the WDS or equivalent. (See PCM INSPECTION [LF, L3].) • TP Is PID value okay?	Yes	Go to next step.
2		No	Repair or replace any defective parts.
3	Disconnect PCM. Is resistance between ground terminal at PCM connector and body ground less than 5.0 ohms?	Yes	Go to next step.
3		No	Repair open ground circuit. Reconnect PCM.
4	Check LPS PID value. Is LPS PID value okay? (See PCM INSPECTION [LF, L3].)	Yes	Overhaul control valve body and repair or replace any defective parts. (See ATX workshop manual (FN4A-EL) [1623-10-98E].) If problem remains, overhaul transaxle and repair or replace any defective parts. (See ATX workshop manual (FN4A-EL) [1623-10-98E].)
4		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 informations and perform repair or diagnosis. - If vehicle not repaired, trouble shooting completed. - If vehicle not repaired or additional diagnostic information not available, replace PCM.