Automatic Transmission

Symptom Troubleshooting Index (cont'd)

 14-15  
Symptom Probable cause(s) Notes
Lock-up clutch does not operate smoothly
  1. Torque converter check valve defective
  2. Lock-up timing valve defective
  3. Lock-up shift valve defective
  4. Lock-up control valve defective
  5. Lock-up clutch piston defective
  6. Torque converter clutch solenoid valve defective
  7. A/T clutch pressure control solenoid valve B defective
  8. Countershaft speed sensor 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 O-rings and check the torque converter clutch solenoid valve for seizure.
  • Check the countershaft speed sensor installation.
Look-up clutch does not engage
  1. Torque converter check valve defective
  2. Lock-up timing valve defective
  3. Lock-up shift valve defective
  4. Lock-up control valve defective
  5. Lock-up clutch piston defective
  6. Torque converter clutch solenoid valve defective
  7. A/T clutch pressure control solenoid valve B defective
  8. Mainshaft speed sensor defective
  9. Countershaft speed sensor 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 O-rings and check the torque converter clutch solenoid valve for seizure.
  • Check the mainshaft speed sensor installation.
  • Check the countershaft speed sensor installation.
A/T gear position indicator does not indicate shift lever positions
  1. Shift cable broken or out of adjustment
  2. Joint in shift cable and transmission or body worn
  3. Transmission range switch defective or out of adjustment
  • Check for a loose shift cable on the shift lever and the transmission control shaft.
  • Check the indicator light indication and check for loose connectors. Inspect the transmission range switch. If the transmission range switch is faulty, replace it. If the transmission range switch is out of adjustment, adjust it and the shift cable.