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Torque Converter Engagement

CAUTION: DO NOT depress TCC switch with transmission in gear and vehicle at a stop. Damage to TCC may result.
NOTE: Both On/Off and modulated TCC solenoid are tested as On/Off solenoids.

Accelerate and upshift vehicle into 3rd gear. Maintain constant speed and depress TCC switch. Torque converter clutch should engage, engine RPM should decrease, and LED should light Green. If TCC solenoid functions correctly, see SYMPTOM DIAGNOSIS under TROUBLE SHOOTING in FORD 4R100 OVERHAUL article for TCC engagement concerns. If TCC solenoid does not function correctly, perform TEST C  under SYSTEM TESTS or TORQUE CONVERTER under COMPONENT TESTS in FORD 4R100 OVERHAUL article for TCC engagement concerns.

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