NO.14 ENGINE FLARES UP OR SLIPS WHEN UPSHIFTING OR DOWNSHIFTING [JA5AX-EL]


14	Engine flares up or slips when upshifting or downshifting
DESCRIPTION	• When accelerator pedal depressed for driveway, engine speed increases but vehicle speed increase slowly. • When accelerator pedal 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. - Clutch stuck, slippage • Line pressure low • Incorrect throttle position signal • Malfunction of VSS • Malfunction of input/turbine speed sensor • Malfunction of sensor ground • Malfunction of shift solenoid A, B, or C • Malfunction of TCC solenoid valve • Malfunction of body ground • Misadjustment of throttle cable • Malfunction of control valve body - 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 line pressure okay? (See Line Pressure Test.)	Yes	Go to next step.
1	• Is line pressure okay? (See Line Pressure Test.)	No	Repair or replace any defective parts according to inspection results.
2	• Is shift point okay? (See ROAD TEST [JA5AX-EL].)	Yes	Go to next step.
2	• Is shift point okay? (See ROAD TEST [JA5AX-EL].)	No	Go to symptom troubleshooting No.9 "Abnormal shifting".
3	• Stop engine. • Inspect shift solenoid A, B, or C circuit. • Are they okay?	Yes	• Overhaul control valve body and repair or replace any defective parts. (See ATX Workshop Manual.) • If problem remains, replace or overhaul transaxle and repair or replace any defective parts. (See ATX Workshop Manual.)
3		No	• Inspect for shift solenoid mechanical stuck. (See SOLENOID VALVE INSPECTION [JA5AX-EL].)
4	• 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 repaired, troubleshooting completed. • If vehicle not repaired or additional diagnostic information not available, replace TCM.

Mazdamanuals.com