Torque converter clutch does not disengage
Probable cause(s)
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Shift solenoid valve D defective
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A/T clutch pressure control solenoid valve A defective
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Torque converter clutch piston defective
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Lock-up shift valve defective
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Lock-up control valve defective
Notes
Check for a stored DTC, and check for loose connections.
Test the solenoid valve function with the HDS.
Inspect the A/T clutch pressure control solenoid valve body gasket, ATF feed pipes, and O-rings for wear and damage.
Inspect the O-rings, and check the shift solenoid valve for seizure.
Replace the torque converter assembly.
Check the lock-up shift valve in the regulator valve body for free movement, and check the valve spring for wear and damage.
Check the lock-up control valve in the main valve body for free movement, and check the valve spring for wear and damage.