Torque Converter Clutch (TCC) Solenoid
The TCC receives signal from the PCM. The TCC solenoid controls application, modulation and release of torque converter clutch. If solenoid fails in ON position, vehicle engine will run rough (shudder) and stall in Drive at idle, low speeds with brake applied, or in manual 2nd gear. If solenoid fails in OFF position, torque converter clutch will not engage. Transmission Control Indicator Light (TCIL) may flash.
Scheme 73
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Scheme 76
TORQUE CONVERTOR ENGAGEMENT TEST
Connect tachometer. Warm engine to normal operating temperature. Ensure transmission fluid level is correct. Maintain approximately 50 mph. Release throttle for about 2 seconds, then reapply to previous setting. Engine RPM should increase when throttle is released and decrease in about 5 seconds after throttle is reapplied. If torque converter clutch operation is not as specified, see TROUBLE SHOOTING in FORD E4OD article.
Torque Converter Engagement
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 .