Automatic Transmission

Symptom Troubleshooting Index (cont'd)

 14-14  
Symptom Probable cause(s) Notes
Poor acceleration; flares on starting off in and positions:

Stall speed low
  1. Torque converter one-way clutch defective
  2. Engine output low
  3. Lock-up shift valve defective
  4. Lock-up clutch piston defective
  5. Shift solenoid valve A defective
  6. Restricted ATF cooler
  • Check the indicator light indication and check for loose connectors. Inspect the shift solenoid valve filter/gasket and the shift solenoid valve A for seizure.
  • Check ATF cooling system for restriction.
Engine idle vibration
  1. Low ATF level
  2. Shift solenoid valve A defective
  3. A/T clutch pressure control solenoid valve A defective
  4. Drive plate defective or transmission misassembled
  5. Engine output low, low idle speed
  6. Lock-up clutch piston defective
  7. ATF pump worn or binding
  8. Lock-up shift valve defective
  9. Restricted ATF cooler
  10. Misadjusted engine mounts
  • Set idle rpm in gear to the specified idle speed. If still no good, adjust the engine mounts as outlined in the engine section of this shop manual.
  • Check ATF level and check ATF cooler lines for leakage and loose connections. If necessary, flush ATF cooler lines.
  • Check the indicator light indication and check for loose connectors. Inspect the shift solenoid valve filter/gasket and the shift solenoid valve A for seizure.
  • Inspect the A/T clutch pressure control solenoid valve filter/gasket for wear and damage. If the A/T clutch pressure control solenoid valve A is stuck, inspect the CPC valve.
  • Check ATF cooling system for restriction.
Vehicle moves in position
  1. Excessive ATF
  2. 1st clutch defective
  3. 2nd clutch defective
  4. 3rd clutch defective
  5. 4th clutch defective
  6. Foreign material in main orifice
  7. Clutch clearance incorrect
  8. Needle bearing seized up, worn, or damaged
  9. Thrust washer seized up, worn, or damaged
  • Check ATF level and drain ATF.
  • Inspect the clutch piston, clutch piston check valve and O-rings. Check the spring retainer for wear and damage. Inspect the clutch end-plate-to-top-disc clearance. If the clearance is out of tolerance, inspect the clutch discs and plates for wear and damage. If the discs and plates are worn or damaged, replace them as a set. If they are OK, adjust the clearance with the clutch end plate.
  • Check for clutch pressure in neutral.