Lincoln Corsair: Automatic Transmission - 8-Speed Automatic Transmission – 8F35/8F40 / Diagnosis and Testing - Torque Converter Clutch (TCC)

Lincoln Corsair 2020-2023 Service Manual / Powertrain / Automatic Transmission / Automatic Transmission - 8-Speed Automatic Transmission – 8F35/8F40 / Diagnosis and Testing - Torque Converter Clutch (TCC)

Principles of Operation

Symptom Chart

Torque Converter Clutch

For torque converter clutch operation,
REFER to: Torque Converter Clutch (TCC) (307-01A Automatic Transmission - 8-Speed Automatic Transmission – 8F35/8F40, Description and Operation).

Symptom	Possible Sources	Action
TCC does not apply	Solenoid filter blocked to the TCC solenoid	INSTALL a new TCC solenoid. REFER to: Solenoid (307-01A Automatic Transmission - 8-Speed Automatic Transmission – 8F35/8F40, Removal and Installation).
	TCC solenoid mechanically stuck off	INSTALL a new TCC solenoid. REFER to: Solenoid (307-01A Automatic Transmission - 8-Speed Automatic Transmission – 8F35/8F40, Removal and Installation).
	TCC regulator valve stuck off	DISASSEMBLE, CLEAN and INSPECT the TCC regulator valve. If the bore or valve is damaged or if the spring is damaged or missing, INSTALL a new main control valve body. REFER to: Main Control Valve Body (307-01A Automatic Transmission - 8-Speed Automatic Transmission – 8F35/8F40, Overhaul).
	Pump stator bushing and/or input shaft worn	REMOVE, CLEAN and INSPECT the pump assembly, the input shaft and the torque converter. If the pump stator bushing and/or the input shaft are worn, INSTALL a new pump assembly, input shaft and torque converter. REFER to: Transmission (307-01A Automatic Transmission - 8-Speed Automatic Transmission – 8F35/8F40, Overhaul).
	TCC APPLY hydraulic circuit blocked or leaking	DISASSEMBLE and INSPECT the transmission, main control and pump assembly passages for debris/blockage. CLEAN as necessary. INSPECT the TCC hydraulic circuits for leaks. REFER to: Main Control Valve Body (307-01A Automatic Transmission - 8-Speed Automatic Transmission – 8F35/8F40, Overhaul). REFER to: Transmission (307-01A Automatic Transmission - 8-Speed Automatic Transmission – 8F35/8F40, Overhaul). REFER to: Torque Converter Clutch (TCC) (307-01A Automatic Transmission - 8-Speed Automatic Transmission – 8F35/8F40, Description and Operation).
	TCC friction material worn or damaged.	INSTALL a new torque converter. REFER to: Transmission (307-01A Automatic Transmission - 8-Speed Automatic Transmission – 8F35/8F40, Removal and Installation).
TCC always applied/stalls vehicle	TCC solenoid mechanically stuck on	INSTALL a new TCC solenoid. REFER to: Solenoid (307-01A Automatic Transmission - 8-Speed Automatic Transmission – 8F35/8F40, Removal and Installation).
	TCC regulator valve stuck on	DISASSEMBLE, CLEAN and INSPECT the TCC regulator valve. If the bore or valve is damaged or if the spring is damaged or missing, INSTALL a new main control valve body. REFER to: Main Control Valve Body (307-01A Automatic Transmission - 8-Speed Automatic Transmission – 8F35/8F40, Overhaul).
	TCC RELEASE hydraulic circuit blocked or leaking	DISASSEMBLE and INSPECT the transmission, main control and pump assembly passages for debris/blockage. CLEAN as necessary. INSPECT the TCC hydraulic circuits for leaks. REFER to: Main Control Valve Body (307-01A Automatic Transmission - 8-Speed Automatic Transmission – 8F35/8F40, Overhaul). REFER to: Transmission (307-01A Automatic Transmission - 8-Speed Automatic Transmission – 8F35/8F40, Overhaul). REFER to: Torque Converter Clutch (TCC) (307-01A Automatic Transmission - 8-Speed Automatic Transmission – 8F35/8F40, Description and Operation).
	TCC welded or damaged.	INSTALL a new torque converter. REFER to: Transmission (307-01A Automatic Transmission - 8-Speed Automatic Transmission – 8F35/8F40, Removal and Installation).
TCC cycles, shudders or chatters	Incorrect Transmission Strategy programmed into the PCM / TCM	PERFORM transmission strategy download and the adaptive learning drive cycle. REFER to: Transmission Strategy Download (307-01A Automatic Transmission - 8-Speed Automatic Transmission – 8F35/8F40, General Procedures). REFER to: Adaptive Learning Drive Cycle (307-01A Automatic Transmission - 8-Speed Automatic Transmission – 8F35/8F40, General Procedures).
	TCC solenoid filter or seal damaged at TCC solenoid	INSTALL a new TCC solenoid. REFER to: Solenoid (307-01A Automatic Transmission - 8-Speed Automatic Transmission – 8F35/8F40, Removal and Installation).
	TCC solenoid mechanically sticking	INSTALL a new TCC solenoid. REFER to: Solenoid (307-01A Automatic Transmission - 8-Speed Automatic Transmission – 8F35/8F40, Removal and Installation).
	TCC regulator valve, springs, clips loose, stuck, binding, missing, misassembled	DISASSEMBLE, CLEAN and INSPECT the TCC regulator valve. If the bore or valve is damaged or if the spring is damaged or missing, INSTALL a new main control valve body. REFER to: Main Control Valve Body (307-01A Automatic Transmission - 8-Speed Automatic Transmission – 8F35/8F40, Overhaul).
	TCC RELEASE/TCC APPLY hydraulic circuit blocked or leaking	DISASSEMBLE and INSPECT the transmission, main control and pump assembly for debris/blockage. CLEAN as necessary. INSPECT the TCC hydraulic circuits for leaks REFER to: Main Control Valve Body (307-01A Automatic Transmission - 8-Speed Automatic Transmission – 8F35/8F40, Overhaul). REFER to: Transmission (307-01A Automatic Transmission - 8-Speed Automatic Transmission – 8F35/8F40, Overhaul). REFER to: Torque Converter Clutch (TCC) (307-01A Automatic Transmission - 8-Speed Automatic Transmission – 8F35/8F40, Description and Operation).
	TCC cycling/shudder/chatter	VERIFY the TCC is causing the concern. ATTEMPT to duplicate event while commanding the PID TCC_OSC OFF. If the concern cannot be duplicated while the TCC is commanded off the TCC may be worn or damaged. INSTALL a new torque converter. REFER to: Transmission (307-01A Automatic Transmission - 8-Speed Automatic Transmission – 8F35/8F40, Removal and Installation).

Diagnosis and Testing - F Clutch

Symptom Chart F clutch For F clutch operation, REFER to: F Clutch (307-01A Automatic Transmission - 8-Speed Automatic Transmission – 8F35/8F40, Description and Operation)...

General Procedures - Adaptive Learning Drive Cycle

Configuration NOTE: The engine and transmission must be at normal operating temperature. Using the scan tool, clear the DTC and Transmission Adaptive Tables...

Other information:

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Note: Make sure that you are sitting in the correct position.

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