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

Check for a stored DTC, and check for loose connections.

Notes

Test the solenoid valve function with the HDS.

Notes

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

Notes

Inspect the shift solenoid valve O-rings, and check for shift solenoid valve for seizure.

Notes

Check the input shaft (mainshaft) speed sensor and output shaft (countershaft) speed sensor installation.

Notes

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 for free movement, and check the valve spring for wear and damage.

Notes

Check the lock-up shift valve in the regulator valve body for free movement, and check the valve spring for wear and damage.

Notes

Check the lock-up control valve in the main valve body for free movement, and check the valve spring for wear and damage.