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

id050305801900

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.

Diagnostic procedure

STEP | INSPECTION | ACTION
--- | --- | ---
1 | • Is line pressure okay? (See Line Pressure Test.) | Yes | Go to next step.
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.
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.)
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.