Lincoln Navigator: Automatic Transmission - 10-Speed Automatic Transmission – 10R80 / A Clutch. Diagnosis and Testing
A Clutch Assembly
A Clutch
For A clutch operation,
REFER to: A Clutch (307-01 Automatic Transmission - 10-Speed Automatic Transmission – 10R80, Description and Operation).
A Clutch
| Condition | Possible Sources | Action |
| A clutch does not apply | SSA mechanically stuck OFF |
INSTALL a new solenoid. REFER to: Shift Solenoids (SS) (307-01 Automatic Transmission - 10-Speed Automatic Transmission – 10R80, Removal and Installation). |
| A clutch control valve stuck OFF |
DISASSEMBLE, CLEAN and INSPECT the A clutch
control valve. If the bore or valve is damaged, INSTALL a new main
control valve body. REFER to: Main Control Valve Body (307-01 Automatic Transmission - 10-Speed Automatic Transmission – 10R80, Removal and Installation). |
|
| A clutch latch valve stuck OFF |
DISASSEMBLE, CLEAN and INSPECT the A clutch
latch valve. If the bore or valve is damaged, INSTALL a new main control
valve body. REFER to: Main Control Valve Body (307-01 Automatic Transmission - 10-Speed Automatic Transmission – 10R80, Removal and Installation). |
|
| A clutch hydraulic circuits blocked/leaking |
DISASSEMBLE and INSPECT the main control
valve body and separator plate passages for debris, blockage and leaks.
CLEAN as necessary. REFER to: Main Control Valve Body (307-01 Automatic Transmission - 10-Speed Automatic Transmission – 10R80, Removal and Installation). |
|
|
CARRY OUT the air pressure test on the A clutch. REFER to: Special Testing Procedures (307-01 Automatic Transmission - 10-Speed Automatic Transmission – 10R80, Diagnosis and Testing). If a leak is detected, INSPECT the front support assembly and A clutch piston seals for leaks. INSTALL new components as necessary. REFER to: Transmission (307-01 Automatic Transmission - 10-Speed Automatic Transmission – 10R80, Overhaul). |
||
| Front support assembly, ring gear no. 1 |
DISASSEMBLE and INSPECT the front support
assembly hydraulic passages for debris, blockage or leaks. INSPECT the
front support assembly and ring gear no. 1 for wear and damage. CLEAN or
INSTALL new components as necessary. REFER to: Transmission (307-01 Automatic Transmission - 10-Speed Automatic Transmission – 10R80, Overhaul). |
|
| A clutch piston seals |
DISASSEMBLE and INSPECT the A clutch piston
seals for wear and damage. INSTALL new components as necessary. REFER to: Transmission (307-01 Automatic Transmission - 10-Speed Automatic Transmission – 10R80, Overhaul). |
|
| A clutch friction plates |
DISASSEMBLE and INSPECT the A clutch
friction and steel plates for wear and damage. INSTALL new components as
necessary. REFER to: Transmission (307-01 Automatic Transmission - 10-Speed Automatic Transmission – 10R80, Overhaul). |
|
| A clutch always applied | SSA mechanically stuck ON |
INSTALL a new solenoid. REFER to: Shift Solenoids (SS) (307-01 Automatic Transmission - 10-Speed Automatic Transmission – 10R80, Removal and Installation). |
| A clutch control valve stuck ON |
DISASSEMBLE, CLEAN and INSPECT the A clutch
control valve. If the bore or valve is damaged, INSTALL a new main
control valve body. REFER to: Main Control Valve Body (307-01 Automatic Transmission - 10-Speed Automatic Transmission – 10R80, Removal and Installation). |
|
| A clutch latch valve stuck ON |
DISASSEMBLE, CLEAN and INSPECT the A clutch
latch valve. If the bore or valve is damaged, INSTALL a new main control
valve body. REFER to: Main Control Valve Body (307-01 Automatic Transmission - 10-Speed Automatic Transmission – 10R80, Removal and Installation). |
|
| A clutch hydraulic circuit cross leaks |
DISASSEMBLE and INSPECT the main control
valve body and separator plate passages for cracks, warping and damage.
If damage is found, INSTALL a new main control valve body. REFER to: Main Control Valve Body (307-01 Automatic Transmission - 10-Speed Automatic Transmission – 10R80, Removal and Installation). |
|
| Front support assembly, ring gear no. 1 |
DISASSEMBLE and INSPECT the front support
assembly hydraulic passages for debris, blockage and leaks. Inspect the
front support assembly and ring gear no. 4 for wear and damage. CLEAN or
INSTALL new components necessary. REFER to: Transmission (307-01 Automatic Transmission - 10-Speed Automatic Transmission – 10R80, Overhaul). |
|
| A clutch piston return spring |
DISASSEMBLE and INSPECT the A clutch piston
return spring for damage. INSTALL new components as necessary. REFER to: Transmission (307-01 Automatic Transmission - 10-Speed Automatic Transmission – 10R80, Overhaul). |
|
| A clutch friction plates |
DISASSEMBLE and INSPECT the A clutch
friction and steel plates for wear and damage. INSTALL new components as
necessary. REFER to: Transmission (307-01 Automatic Transmission - 10-Speed Automatic Transmission – 10R80, Overhaul). |
|
| A clutch delayed/soft/slipping apply | Incorrect transmission strategy programmed into PCM / TCM . |
CARRY OUT the Transmission Strategy Download and the Adaptive Learning Drive Cycle. REFER to: Transmission Strategy Download (307-01 Automatic Transmission - 10-Speed Automatic Transmission – 10R80, General Procedures). REFER to: Adaptive Learning Drive Cycle (307-01 Automatic Transmission - 10-Speed Automatic Transmission – 10R80, General Procedures). |
| Low line pressure |
CARRY OUT the line pressure test. If line
pressure is low, REFER to the Line Pressure Diagnosis Chart. REFER to: Special Testing Procedures (307-01 Automatic Transmission - 10-Speed Automatic Transmission – 10R80, Diagnosis and Testing). |
|
| SSA mechanically sticking |
INSTALL a new solenoid. REFER to: Shift Solenoids (SS) (307-01 Automatic Transmission - 10-Speed Automatic Transmission – 10R80, Removal and Installation). |
|
| A clutch control valve sticking |
DISASSEMBLE, CLEAN and INSPECT the A clutch
control valve. If the bore or valve is damaged, INSTALL a new main
control valve body. REFER to: Main Control Valve Body (307-01 Automatic Transmission - 10-Speed Automatic Transmission – 10R80, Removal and Installation). |
|
| A clutch latch valve sticking |
DISASSEMBLE, CLEAN and INSPECT the A clutch
latch valve. If the bore or valve is damaged, INSTALL a new main control
valve body. REFER to: Main Control Valve Body (307-01 Automatic Transmission - 10-Speed Automatic Transmission – 10R80, Removal and Installation). |
|
| A clutch hydraulic circuits blocked/leaking |
DISASSEMBLE and INSPECT the main control
valve body and separator plate passages for debris, blockage and leaks.
CLEAN as necessary. REFER to: Main Control Valve Body (307-01 Automatic Transmission - 10-Speed Automatic Transmission – 10R80, Removal and Installation). |
|
|
CARRY OUT the air pressure test on the A clutch. REFER to: Special Testing Procedures (307-01 Automatic Transmission - 10-Speed Automatic Transmission – 10R80, Diagnosis and Testing). If a leak is detected, INSPECT the front support assembly and A clutch piston seals for leaks. INSTALL new components as necessary. REFER to: Transmission (307-01 Automatic Transmission - 10-Speed Automatic Transmission – 10R80, Overhaul). |
||
| A clutch piston seals |
DISASSEMBLE and INSPECT the A clutch piston
seals for wear and damage. INSTALL new components as necessary. REFER to: Transmission (307-01 Automatic Transmission - 10-Speed Automatic Transmission – 10R80, Overhaul). |
|
| A clutch friction plates |
DISASSEMBLE and INSPECT the A clutch
friction and steel plates for wear and damage. INSTALL new components as
necessary. REFER to: Transmission (307-01 Automatic Transmission - 10-Speed Automatic Transmission – 10R80, Overhaul). |
|
| A clutch harsh apply | Incorrect transmission strategy programmed into PCM / TCM . |
CARRY OUT the Transmission Strategy Download and the Adaptive Learning Drive Cycle. REFER to: Transmission Strategy Download (307-01 Automatic Transmission - 10-Speed Automatic Transmission – 10R80, General Procedures). REFER to: Adaptive Learning Drive Cycle (307-01 Automatic Transmission - 10-Speed Automatic Transmission – 10R80, General Procedures). |
| High line pressure |
CARRY OUT the line pressure test. If line
pressure is high, REFER to the Line Pressure Diagnosis Chart. REFER to: Special Testing Procedures (307-01 Automatic Transmission - 10-Speed Automatic Transmission – 10R80, Diagnosis and Testing). |
|
| SSA mechanically sticking |
INSTALL a new solenoid. REFER to: Shift Solenoids (SS) (307-01 Automatic Transmission - 10-Speed Automatic Transmission – 10R80, Removal and Installation). |
|
| A clutch control valve sticking |
DISASSEMBLE, CLEAN and INSPECT the A clutch
control valve. If the bore or valve is damaged, INSTALL a new main
control valve body. REFER to: Main Control Valve Body (307-01 Automatic Transmission - 10-Speed Automatic Transmission – 10R80, Removal and Installation). |
|
| A clutch latch valve sticking |
DISASSEMBLE, CLEAN and INSPECT the A clutch
latch valve. If the bore or valve is damaged, INSTALL a new main control
valve body. REFER to: Main Control Valve Body (307-01 Automatic Transmission - 10-Speed Automatic Transmission – 10R80, Removal and Installation). |
|
| A clutch hydraulic circuit blocked/leaking |
DISASSEMBLE and INSPECT the main control
valve body and separator plate passages for debris, blockage and leaks.
CLEAN as necessary. REFER to: Main Control Valve Body (307-01 Automatic Transmission - 10-Speed Automatic Transmission – 10R80, Removal and Installation). |
|
| A clutch piston return spring |
DISASSEMBLE and INSPECT the A clutch piston
return spring for damage. INSTALL new components as necessary. REFER to: Transmission (307-01 Automatic Transmission - 10-Speed Automatic Transmission – 10R80, Overhaul). |
|
| A clutch friction plates |
DISASSEMBLE and INSPECT the A clutch
friction and steel plates for wear and damage. INSTALL new components as
necessary. REFER to: Transmission (307-01 Automatic Transmission - 10-Speed Automatic Transmission – 10R80, Overhaul). |
Special Testing Procedures. Diagnosis and Testing
Line Pressure Test
This test verifies the line pressure is within specification.
If available, refer to the Transmission Line Pressure Test general procedure to access the line pressure tap...
B Clutch. Diagnosis and Testing
Symptom Chart
B Clutch
For B clutch operation, REFER to: B Clutch (307-01 Automatic Transmission - 10-Speed Automatic Transmission – 10R80, Description and Operation)...
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