Lincoln Corsair: Automatic Transmission - 8-Speed Automatic Transmission – 8F35/8F40 / Diagnosis and Testing - C Clutch
Lincoln Corsair 2020-2024 Service Manual / Powertrain / Automatic Transmission / Automatic Transmission - 8-Speed Automatic Transmission – 8F35/8F40 / Diagnosis and Testing - C Clutch
Symptom Chart
For C clutch operation,
REFER to: C Clutch (307-01A Automatic Transmission - 8-Speed Automatic Transmission – 8F35/8F40, Description and Operation).
C clutch
| Condition | Possible Sources | Action |
| C clutch does not apply | SSC is mechanically stuck off |
INSTALL a new solenoid. REFER to: Solenoid (307-01A Automatic Transmission - 8-Speed Automatic Transmission – 8F35/8F40, Removal and Installation). |
| C clutch control valve stuck off |
DISASSEMBLE, CLEAN and INSPECT the clutch
control valve. If the bore or valve is damaged, INSTALL a new main
control valve body. REFER to: Main Control Valve Body (307-01A Automatic Transmission - 8-Speed Automatic Transmission – 8F35/8F40, Overhaul). |
|
| C CL CONTR, hydraulic circuit blocked/leaking |
DISASSEMBLE and INSPECT the main control
valve body and separator plate passages for debris/blockage. CLEAN as
necessary. REFER to: Main Control Valve Body (307-01A Automatic Transmission - 8-Speed Automatic Transmission – 8F35/8F40, Overhaul). |
|
| C clutch piston seals |
INSPECT the components for wear and damage. CLEAN and/or INSTALL new components as necessary. REFER to: Transmission (307-01A Automatic Transmission - 8-Speed Automatic Transmission – 8F35/8F40, Overhaul). |
|
| C clutch hub/reaction sun gear |
The C clutch hub and the B clutch drum are
the same component. If diagnostics indicate both C clutch and B clutch
failures, INSPECT the components for wear and damage. INSTALL new
components as necessary. REFER to: Transmission (307-01A Automatic Transmission - 8-Speed Automatic Transmission – 8F35/8F40, Overhaul). |
|
| C clutch friction plates |
INSPECT the components for wear and damage. INSTALL new components as necessary. REFER to: Transmission (307-01A Automatic Transmission - 8-Speed Automatic Transmission – 8F35/8F40, Overhaul). |
|
| C clutch always applied | SSC mechanically stuck |
INSTALL a new solenoid. REFER to: Solenoid (307-01A Automatic Transmission - 8-Speed Automatic Transmission – 8F35/8F40, Removal and Installation). |
| C clutch regulator valve or C clutch latch valve stuck on |
DISASSEMBLE, CLEAN and INSPECT the regulator
valve. If the bore or valve is damaged, INSTALL a new main control
valve body. REFER to: Main Control Valve Body (307-01A Automatic Transmission - 8-Speed Automatic Transmission – 8F35/8F40, Overhaul). |
|
| C CL CONTR, hydraulic circuit cross leaks |
DISASSEMBLE and INSPECT the main control
valve body and separator plate passages for debris/blockage. CLEAN as
necessary. REFER to: Main Control Valve Body (307-01A Automatic Transmission - 8-Speed Automatic Transmission – 8F35/8F40, Overhaul). |
|
| C clutch hub, clutch and planetary carrier, No. 4 ring gear |
INSPECT the components for wear and damage. INSTALL new components as necessary. REFER to: Transmission (307-01A Automatic Transmission - 8-Speed Automatic Transmission – 8F35/8F40, Overhaul). |
|
| C clutch friction plates |
INSPECT the components for wear and damage. INSTALL new components as necessary. REFER to: Transmission (307-01A Automatic Transmission - 8-Speed Automatic Transmission – 8F35/8F40, Overhaul). |
|
| C clutch piston seals |
INSPECT the components for wear and damage. INSTALL new components as necessary. REFER to: Transmission (307-01A Automatic Transmission - 8-Speed Automatic Transmission – 8F35/8F40, Overhaul). |
|
| C clutch delayed/soft/slipping apply | Incorrect transmission strategy programmed into PCM / TCM . |
PERFORM the Transmission Strategy Download, REFER to: Transmission Strategy Download (307-01A Automatic Transmission - 8-Speed Automatic Transmission – 8F35/8F40, General Procedures). |
| Low line pressure |
PERFORM line pressure test. REFER to: Special Testing Procedures (307-01A Automatic Transmission - 8-Speed Automatic Transmission – 8F35/8F40, Diagnosis and Testing). |
|
| SSC mechanically sticking |
INSTALL a new solenoid. REFER to: Solenoid (307-01A Automatic Transmission - 8-Speed Automatic Transmission – 8F35/8F40, Removal and Installation). |
|
| C clutch control valve sticking |
DISASSEMBLE, CLEAN and INSPECT the clutch
control valve. If the bore or valve is damaged, INSTALL a new main
control valve body. REFER to: Main Control Valve Body (307-01A Automatic Transmission - 8-Speed Automatic Transmission – 8F35/8F40, Overhaul). |
|
| C CL CONTR, hydraulic circuits blocked/leaking |
DISASSEMBLE and INSPECT the main control
valve body and separator plate passages for debris/blockage. CLEAN as
necessary. REFER to: Main Control Valve Body (307-01A Automatic Transmission - 8-Speed Automatic Transmission – 8F35/8F40, Overhaul). |
|
| C clutch friction plates |
INSPECT the components for wear and damage. INSTALL new components as necessary. REFER to: Transmission (307-01A Automatic Transmission - 8-Speed Automatic Transmission – 8F35/8F40, Overhaul). |
|
| C clutch piston seals |
INSPECT the components for wear and damage. INSTALL new components as necessary. REFER to: Transmission (307-01A Automatic Transmission - 8-Speed Automatic Transmission – 8F35/8F40, Overhaul). |
|
| C clutch harsh apply | Incorrect transmission strategy programmed into PCM / TCM . |
PERFORM the Transmission Strategy Download, REFER to: Transmission Strategy Download (307-01A Automatic Transmission - 8-Speed Automatic Transmission – 8F35/8F40, General Procedures). |
| High line pressure |
PERFORM line pressure test. REFER to: Special Testing Procedures (307-01A Automatic Transmission - 8-Speed Automatic Transmission – 8F35/8F40, Diagnosis and Testing). |
|
| SSC mechanically sticking |
INSTALL a new solenoid. REFER to: Solenoid (307-01A Automatic Transmission - 8-Speed Automatic Transmission – 8F35/8F40, Removal and Installation). |
|
| C clutch control valve sticking Weak or broken C clutch latch valve spring |
DISASSEMBLE, CLEAN and INSPECT the valves.
If the bore or valve is damaged, INSTALL a new main control valve body. REFER to: Main Control Valve Body (307-01A Automatic Transmission - 8-Speed Automatic Transmission – 8F35/8F40, Overhaul). |
|
| C CL CONTR hydraulic circuit blocked/leaking |
DISASSEMBLE and INSPECT the main control
valve body and separator plate passages for debris/blockage. CLEAN as
necessary. REFER to: Main Control Valve Body (307-01A Automatic Transmission - 8-Speed Automatic Transmission – 8F35/8F40, Overhaul). |
|
| C clutch friction plates |
INSPECT the components for wear and damage. INSTALL new components as necessary. REFER to: Transmission (307-01A Automatic Transmission - 8-Speed Automatic Transmission – 8F35/8F40, Overhaul). |
|
| C clutch piston return springs |
INSPECT the components for wear and damage. INSTALL new components as necessary. REFER to: Transmission (307-01A Automatic Transmission - 8-Speed Automatic Transmission – 8F35/8F40, Overhaul). |
Diagnosis and Testing - B Clutch
For B clutch operation, REFER to: B Clutch (307-01A Automatic Transmission - 8-Speed Automatic Transmission – 8F35/8F40, Description and Operation).
B clutch
Condition
Possible Sources
Action
B clutch does not apply
SSB is mechanically stuck off
INSTALL a new solenoid...
Diagnosis and Testing - Hydraulic Selectable One-Way Clutch Assembly
Symptom Chart
For selectable one-way clutch operation, REFER to: Hydraulic
Selectable One-Way Clutch Assembly (307-01A Automatic Transmission -
8-Speed Automatic Transmission – 8F35/8F40, Description and Operation)...
Other information:
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