Torque Converter Clutch Does Not Engage

Torque converter clutch does not engage

Shift solenoid valve D defective

A/T clutch pressure control solenoid valve A defective

Input shaft (mainshaft) speed sensor defective

Output shaft (countershaft) speed sensor defective

Torque converter clutch piston defective

Torque converter check valve defective

Lock-up shift valve defective

Lock-up control valve defective

Notes

Test the solenoid valve function with the HDS.

Notes

Inspect the A/T clutch pressure control solenoid valve body gasket, the ATF feed pipes, and the O-rings for wear and damage.

Notes

Inspect shift solenoid valve D for seizure, and the O-rings for wear and damage.

Notes

Check the input shaft (mainshaft) speed sensor and the output shaft (countershaft) speed sensor installation. Inspect the sensor O-ring for wear and damage.

Notes

Replace the torque converter assembly.

Notes

Check the torque converter check valve in the regulator valve body.

Notes

Check the lock-up shift valve in the regulator valve body.

Notes

Check the lock-up control valve in the main valve body.