Test I: Shock During Shifting & Transaxle Run-Up

WARNING: This page is about a different variant/trim than selected.

NOTE: If shock occurs during upshift and downshift while driving and transaxle speed becomes higher than engine speed (run-up), likely cause may be abnormal line pressure, or faulty solenoid valves, oil pump, valve body, brakes, clutches or faulty PCM.

Using scan tool, attempt to actuate each shift solenoid valve. If operation of each solenoid can be heard, go to next step. If operation of each solenoid cannot be heard, replace appropriate solenoid. See SOLENOID VALVES under REMOVAL & INSTALLATION.
Adjust line pressure. See HYDRAULIC PRESSURE ADJUSTMENTS under PERFORMANCE TESTS. If symptoms are still present, go to next step. If correct line pressure cannot be obtained, go to step 4 .
Remove transaxle assembly. See appropriate REMOVAL & INSTALLATION article in AUTOMATIC TRANSMISSIONS. Disassemble transaxle and inspect clutches and brakes. See appropriate OVERHAUL article. Check for burned clutch components, defective seals, and retainer interference. Repair as necessary.
Remove transaxle assembly. See appropriate REMOVAL & INSTALLATION article in AUTOMATIC TRANSMISSIONS. Replace oil pump assembly. See appropriate OVERHAUL article. If symptoms are still present after repairs, go to next step.
Disassemble valve body and inspect. See appropriate OVERHAUL article. Check for loose bolts, damaged "O" rings, valves and valve bodies. Repair or replace as necessary. If symptom is eliminated, diagnosis is complete. If symptom is not eliminated, replace PCM. See appropriate REMOVAL, OVERHAUL & INSTALLATION article in ENGINE PERFORMANCE.