Automatic Transmission

Symptom Troubleshooting Index (cont'd)

 14-21  

Symptom Probable cause(s) Notes
Noise from transmission in all shift lever positions
  1. ATF pump worn or binding
  2. Torque converter housing and transmission housing bearings worn or damaged
  • Improper alignment of ATF pump and torque converter housing may cause ATF pump seizure. The symptoms are mostly an rpm-related ticking noise or a high pitched squeak.
  • Inspect the contact of the mainshaft and countershaft with the bearings. Check the ATF guide plate for damage and wear. Inspect the 1st clutch feed pipe for damage and out of round. If the 1st clutch feed pipe is damaged or out of round, replace it. Replace the mainshaft if the bushing of the 1st clutch feed pipe is damaged or out of round.
  • Inspect the reverse selector gear teeth chamfers and engagement teeth chamfers of the countershaft 4th gear and reverse gear. If they are worn or damaged, replace them.
  • Inspect the differential pinion shaft for wear under pinion gears. If the differential pinion shaft is worn, overhaul differential assembly, replace the ATF strainer, thoroughly clean transmission and flush transmission and cooler lines.
  • Inspect the bottom of the 3rd clutch for swirl marks. If the bottom of the 3rd clutch is swirled, replace the countershaft and final driven gear.
Vehicle does not accelerate more than 31 mph (50 km/h). Torque converter one-way clutch defective Replace the torque converter.
Vibration in all shift lever positions
  1. Low idle speed
  2. Misadjusted engine mounts
  3. Drive plate defective or transmission misassembled
  • 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 the stall speed.
  • Check for a misinstalled/damaged drive plate.
Shift lever does not operate smoothly.
  1. Shift cable broken or out of adjustment
  2. Joint in shift cable and transmission or body worn
 Check for loose shift cable on the shift lever and the transmission control shaft.
Fails to shift:

stuck in 4th gear
  1. A/T clutch pressure control solenoid valve A defective
  2. Shift solenoid valve A defective
  3. Shift solenoid valve B defective
  • Check the indicator light indication and check for loose connectors. Inspect the A/T clutch pressure control solenoid valve filter/gasket for wear and damage. If the A/T clutch pressure control solenoid valve is stuck, inspect the CPC valve.
  • Check the indicator light indication and check for loose connectors. Inspect the shift solenoid valve filter/gasket and the shift solenoid valves A and B for seizure.