Torque converter clutch does not engage
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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Input shaft (mainshaft) speed sensor defective
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Output shaft (countershaft) speed sensor defective
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Torque converter clutch piston defective
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Torque converter check valve 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.
Check the input shaft (mainshaft) speed sensor and output shaft (countershaft) speed sensor installation.
Inspect the sensor O-ring for wear and damage.
Replace the torque converter assembly.
Check the torque converter check valve in the regulator valve body for free movement, and check the valve spring for wear and damage.
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.