Lincoln Navigator Manuals

Lincoln Navigator: Automatic Transmission - 10-Speed Automatic Transmission – 10R80 / B Clutch. Diagnosis and Testing

Lincoln Navigator 2018-2026 Workshop Manual / Automatic Transmission / Automatic Transmission - 10-Speed Automatic Transmission – 10R80 / 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).


  B Clutch


Condition Possible Sources Action
B clutch does not apply SSB mechanically stuck OFF INSTALL a new solenoid.
REFER to: Shift Solenoids (SS) (307-01 Automatic Transmission - 10-Speed Automatic Transmission – 10R80, Removal and Installation).
B clutch control valve stuck OFF DISASSEMBLE, CLEAN and INSPECT the B 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).
B clutch latch valve stuck OFF DISASSEMBLE, CLEAN and INSPECT the B 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).
B 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).
CARRY OUT the air pressure test on the B 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 B 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, sun gear no. 1 DISASSEMBLE and INSPECT the front support assembly hydraulic passages for debris, blockage and leaks. INSPECT the front support assembly and sun 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).
B clutch piston seals DISASSEMBLE and INSPECT the B 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).
B clutch friction plates DISASSEMBLE and INSPECT the B 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).
B clutch always applied SSB mechanically stuck ON INSTALL a new solenoid.
REFER to: Shift Solenoids (SS) (307-01 Automatic Transmission - 10-Speed Automatic Transmission – 10R80, Removal and Installation).
B clutch control valve stuck ON DISASSEMBLE, CLEAN and INSPECT the B 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).
B clutch latch valve stuck ON DISASSEMBLE, CLEAN and INSPECT the B 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).
B 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, sun gear no. 1 DISASSEMBLE and INSPECT the components for wear and damage. INSTALL new components necessary.
REFER to: Transmission (307-01 Automatic Transmission - 10-Speed Automatic Transmission – 10R80, Overhaul).
B clutch separating springs DISASSEMBLE and INSPECT the B clutch separating springs for damage. INSTALL new components as necessary.
REFER to: Transmission (307-01 Automatic Transmission - 10-Speed Automatic Transmission – 10R80, Overhaul).
B clutch friction plates DISASSEMBLE and INSPECT the B 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).
B 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).
SSB mechanically sticking INSTALL a new solenoid.
REFER to: Shift Solenoids (SS) (307-01 Automatic Transmission - 10-Speed Automatic Transmission – 10R80, Removal and Installation).
B clutch control valve sticking DISASSEMBLE, CLEAN and INSPECT the B 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).
B clutch latch valve sticking DISASSEMBLE, CLEAN and INSPECT the B 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).
B 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 B 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 B clutch piston seals for leaks. INSTALL new components as necessary. REFER to: Transmission (307-01 Automatic Transmission - 10-Speed Automatic Transmission – 10R80, Overhaul).
B clutch piston seals DISASSEMBLE and INSPECT the B 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).
B clutch friction plates DISASSEMBLE and INSPECT the B 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).
B 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).
SSB mechanically sticking INSTALL a new solenoid.
REFER to: Shift Solenoids (SS) (307-01 Automatic Transmission - 10-Speed Automatic Transmission – 10R80, Removal and Installation).
B clutch control valve sticking DISASSEMBLE, CLEAN and INSPECT the B 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).
B clutch latch valve sticking DISASSEMBLE, CLEAN and INSPECT the B 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).
B 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).
B clutch separating springs DISASSEMBLE and INSPECT the B clutch separating springs for damage. INSTALL new components as necessary.
REFER to: Transmission (307-01 Automatic Transmission - 10-Speed Automatic Transmission – 10R80, Overhaul).
B clutch friction plates DISASSEMBLE and INSPECT the B 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. Diagnosis and Testing

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