Ford Ecosport: Automatic Transmission - 6-Speed Automatic Transmission – 6F35 / Diagnosis and Testing - Low/Reverse Clutch Assembly
Ford Ecosport 2014-2024 Service and Repair Manual / Automatic Transmission / Automatic Transmission - 6-Speed Automatic Transmission – 6F35 / Diagnosis and Testing - Low/Reverse Clutch Assembly
Low/Reverse Clutch
For low/reverse clutch operation,
REFER to: Transmission
Description - System Operation and Component Description (307-01B
Automatic Transmission - 6-Speed Automatic Transmission – 6F35,
Description and Operation).
REFER to: Transmission Description (307-01B Automatic Transmission -
6-Speed Automatic Transmission – 6F35, Description and Operation).
REFER to: Low/Reverse Clutch Assembly (307-01A Automatic Transmission -
6-Speed Automatic Transmission – 6F15, Description and Operation).
REFER to: Low/Reverse Clutch Assembly (307-01B Automatic Transmission -
6-Speed Automatic Transmission – 6F35, Description and Operation).
Low/Reverse Clutch
| Condition | Possible Sources | Action |
| Low/Reverse clutch does not apply | SSD filter screen blocked |
CLEAN or INSTALL a new solenoid. REFER to: Solenoid (307-01A Automatic Transmission - 6-Speed Automatic Transmission – 6F15, Removal and Installation). REFER to: Solenoid (307-01B Automatic Transmission - 6-Speed Automatic Transmission – 6F35, Removal and Installation). |
| SSD is mechanically stuck OFF |
INSTALL a new solenoid. REFER to: Solenoid (307-01A Automatic Transmission - 6-Speed Automatic Transmission – 6F15, Removal and Installation). REFER to: Solenoid (307-01B Automatic Transmission - 6-Speed Automatic Transmission – 6F35, Removal and Installation). |
|
| Low reverse/overdrive (4, 5, 6) clutch regulator valve stuck off |
DISASSEMBLE, CLEAN and INSPECT the low/reverse
clutch regulator valve. If bore or valve is damaged, INSTALL a new main
control valve body. REFER to: Main Control Valve Body (307-01A Automatic Transmission - 6-Speed Automatic Transmission – 6F15, Overhaul). REFER to: Main Control Valve Body (307-01B Automatic Transmission - 6-Speed Automatic Transmission – 6F35, Overhaul). |
|
| VBS CBR1/456, CBR1/456, CBR1 hydraulic circuits blocked or 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 - 6-Speed Automatic Transmission – 6F15, Overhaul). REFER to: Main Control Valve Body (307-01B Automatic Transmission - 6-Speed Automatic Transmission – 6F35, Overhaul). |
|
| Clutch bypass valve stuck in default position |
DISASSEMBLE, CLEAN and INSPECT the multiplex
shift valve. If bore or valve is damaged, INSTALL a new main control
valve body. REFER to: Main Control Valve Body (307-01A Automatic Transmission - 6-Speed Automatic Transmission – 6F15, Overhaul). REFER to: Main Control Valve Body (307-01B Automatic Transmission - 6-Speed Automatic Transmission – 6F35, Overhaul). |
|
| Low Reverse clutch main control-to-transmission case seal |
REMOVE the main control valve body, REFER to: Main Control Valve Body (307-01B Automatic Transmission - 6-Speed Automatic Transmission – 6F35, Removal and Installation). INSPECT the CBR1 circuit seal between the main control valve body and the transmission case for missing or damaged seal. INSTALL a new seal. |
|
| Rear planetary carrier/center ring gear |
INSPECT the planetary carrier/center ring gear
for wear and damage that would prevent the gear from being held. INSTALL
new components as necessary. REFER to: Transmission (307-01A Automatic Transmission - 6-Speed Automatic Transmission – 6F15, Overhaul). REFER to: Transmission (307-01A Automatic Transmission - 6-Speed Automatic Transmission – 6F15, Overhaul). |
|
| Low/Reverse clutch friction plates |
DISASSEMBLE and INSPECT the low/reverse clutch
friction and steel plates. INSTALL new components as necessary. REFER to: Transmission (307-01A Automatic Transmission - 6-Speed Automatic Transmission – 6F15, Overhaul). REFER to: Transmission (307-01A Automatic Transmission - 6-Speed Automatic Transmission – 6F15, Overhaul). |
|
| Low/Reverse clutch piston seal leakage |
INSPECT the low/reverse clutch piston and seal. INSTALL new components as necessary. REFER to: Transmission (307-01A Automatic Transmission - 6-Speed Automatic Transmission – 6F15, Overhaul). REFER to: Transmission (307-01A Automatic Transmission - 6-Speed Automatic Transmission – 6F15, Overhaul). |
|
| Center support cracked or leaking. |
INSPECT the center support for damage. INSTALL new components as necessary. REFER to: Transmission (307-01A Automatic Transmission - 6-Speed Automatic Transmission – 6F15, Overhaul). REFER to: Transmission (307-01A Automatic Transmission - 6-Speed Automatic Transmission – 6F15, Overhaul). |
|
| Low/Reverse clutch always applied | SSD O-rings damaged/leaking |
INSTALL a new solenoid. REFER to: Solenoid (307-01A Automatic Transmission - 6-Speed Automatic Transmission – 6F15, Removal and Installation). REFER to: Solenoid (307-01B Automatic Transmission - 6-Speed Automatic Transmission – 6F35, Removal and Installation). |
| SSD mechanically stuck ON |
INSTALL a new solenoid. REFER to: Solenoid (307-01A Automatic Transmission - 6-Speed Automatic Transmission – 6F15, Removal and Installation). REFER to: Solenoid (307-01B Automatic Transmission - 6-Speed Automatic Transmission – 6F35, Removal and Installation). |
|
| Low reverse/overdrive (4, 5, 6) clutch regulator valve stuck ON |
DISASSEMBLE, CLEAN and INSPECT the low/reverse
clutch regulator valve and spring. If bore, valve, or spring is damaged,
INSTALL a new main control valve body. REFER to: Main Control Valve Body (307-01A Automatic Transmission - 6-Speed Automatic Transmission – 6F15, Overhaul). REFER to: Main Control Valve Body (307-01B Automatic Transmission - 6-Speed Automatic Transmission – 6F35, Overhaul). |
|
| VBS CBR1/456, CBR1/456, CBR1 hydraulic circuits cross leaking |
DISASSEMBLE and INSPECT the main control valve
body and separator plate passages for leakage. CLEAN as necessary. REFER to: Main Control Valve Body (307-01A Automatic Transmission - 6-Speed Automatic Transmission – 6F15, Overhaul). REFER to: Main Control Valve Body (307-01B Automatic Transmission - 6-Speed Automatic Transmission – 6F35, Overhaul). |
|
| Low One-Way Clutch (OWC) |
INSPECT the Low One-Way Clutch (OWC) for free
rotation in over-run direction. INSTALL new components as necessary. REFER to: Transmission (307-01A Automatic Transmission - 6-Speed Automatic Transmission – 6F15, Overhaul). REFER to: Transmission (307-01A Automatic Transmission - 6-Speed Automatic Transmission – 6F15, Overhaul). |
|
| Low/Reverse clutch friction plates |
DISASSEMBLE and INSPECT the low/reverse clutch
friction and steel plates. INSTALL new components as necessary. REFER to: Transmission (307-01A Automatic Transmission - 6-Speed Automatic Transmission – 6F15, Overhaul). REFER to: Transmission (307-01A Automatic Transmission - 6-Speed Automatic Transmission – 6F15, Overhaul). |
|
| Low/Reverse clutch piston return spring |
INSPECT the return spring for damage. INSTALL new components as necessary. REFER to: Transmission (307-01A Automatic Transmission - 6-Speed Automatic Transmission – 6F15, Overhaul). REFER to: Transmission (307-01A Automatic Transmission - 6-Speed Automatic Transmission – 6F15, Overhaul). |
|
| Low/Reverse clutch delayed/soft/slipping apply | Incorrect Transmission Strategy programmed into PCM |
Remove SSD and record solenoid band number. REFER to: Solenoid (307-01A Automatic Transmission - 6-Speed Automatic Transmission – 6F15, Removal and Installation). REFER to: Solenoid (307-01B Automatic Transmission - 6-Speed Automatic Transmission – 6F35, Removal and Installation). Using the scan tool, verify the correct band number is stored in the PCM . If band numbers do not match, replace SSD with correct band number. |
| SSD filter screen partially blocked or restricted. |
CLEAN or INSTALL a new solenoid. REFER to: Solenoid (307-01A Automatic Transmission - 6-Speed Automatic Transmission – 6F15, Removal and Installation). REFER to: Solenoid (307-01B Automatic Transmission - 6-Speed Automatic Transmission – 6F35, Removal and Installation). |
|
| SSD mechanically sticking |
INSTALL a new solenoid. REFER to: Solenoid (307-01A Automatic Transmission - 6-Speed Automatic Transmission – 6F15, Removal and Installation). REFER to: Solenoid (307-01B Automatic Transmission - 6-Speed Automatic Transmission – 6F35, Removal and Installation). |
|
| Low reverse/overdrive (4, 5, 6) clutch regulator valve sticking |
DISASSEMBLE, CLEAN and INSPECT the low/reverse
clutch regulator valve. If bore or valve is damaged, INSTALL a new main
control valve body. REFER to: Main Control Valve Body (307-01A Automatic Transmission - 6-Speed Automatic Transmission – 6F15, Overhaul). REFER to: Main Control Valve Body (307-01B Automatic Transmission - 6-Speed Automatic Transmission – 6F35, Overhaul). |
|
| Low reverse/overdrive (4, 5, 6) clutch latch valve stuck ON |
DISASSEMBLE, CLEAN and INSPECT the low/reverse
clutch latch valve. If bore or valve is damaged, INSTALL a new main
control valve body. REFER to: Main Control Valve Body (307-01A Automatic Transmission - 6-Speed Automatic Transmission – 6F15, Overhaul). REFER to: Main Control Valve Body (307-01B Automatic Transmission - 6-Speed Automatic Transmission – 6F35, Overhaul). |
|
| VBS CBR1/456, CBR1/456, CBR1 hydraulic circuits blocked or 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 - 6-Speed Automatic Transmission – 6F15, Overhaul). REFER to: Main Control Valve Body (307-01B Automatic Transmission - 6-Speed Automatic Transmission – 6F35, Overhaul). |
|
| Low Reverse clutch main control-to-transmission case seal |
REMOVE the main control valve body, REFER to: Main Control Valve Body (307-01B Automatic Transmission - 6-Speed Automatic Transmission – 6F35, Removal and Installation). INSPECT the CBR1 circuit seal between the main control valve body and the transmission case for missing or damaged seal. INSTALL a new seal. |
|
| Low/Reverse clutch friction plates |
DISASSEMBLE and INSPECT the low/reverse clutch
friction and steel plates. INSTALL new components as necessary. REFER to: Transmission (307-01A Automatic Transmission - 6-Speed Automatic Transmission – 6F15, Overhaul). REFER to: Transmission (307-01A Automatic Transmission - 6-Speed Automatic Transmission – 6F15, Overhaul). |
|
| Low/Reverse clutch piston seal leakage |
INSPECT the low/reverse clutch piston and seal. INSTALL new components as necessary. REFER to: Transmission (307-01A Automatic Transmission - 6-Speed Automatic Transmission – 6F15, Overhaul). REFER to: Transmission (307-01A Automatic Transmission - 6-Speed Automatic Transmission – 6F15, Overhaul). |
|
| Center support cracked or leaking. |
INSPECT the center support for damage. INSTALL new components as necessary. REFER to: Transmission (307-01A Automatic Transmission - 6-Speed Automatic Transmission – 6F15, Overhaul). REFER to: Transmission (307-01A Automatic Transmission - 6-Speed Automatic Transmission – 6F15, Overhaul). |
|
| Low/Reverse clutch harsh apply | Incorrect Transmission Strategy programmed into PCM |
Remove SSD and record solenoid band number. REFER to: Solenoid (307-01A Automatic Transmission - 6-Speed Automatic Transmission – 6F15, Removal and Installation). REFER to: Solenoid (307-01B Automatic Transmission - 6-Speed Automatic Transmission – 6F35, Removal and Installation). Using the scan tool, verify the correct band number is stored in the PCM . If band numbers do not match, replace SSD with correct band number. |
| SSD mechanically sticking |
INSTALL a new solenoid. REFER to: Solenoid (307-01A Automatic Transmission - 6-Speed Automatic Transmission – 6F15, Removal and Installation). REFER to: Solenoid (307-01B Automatic Transmission - 6-Speed Automatic Transmission – 6F35, Removal and Installation). |
|
| Low reverse/overdrive (4, 5, 6) clutch regulator valve sticking |
DISASSEMBLE, CLEAN and INSPECT the low/reverse
clutch regulator valve and spring. If bore, valve or spring is damaged,
INSTALL a new main control valve body. REFER to: Main Control Valve Body (307-01A Automatic Transmission - 6-Speed Automatic Transmission – 6F15, Overhaul). REFER to: Main Control Valve Body (307-01B Automatic Transmission - 6-Speed Automatic Transmission – 6F35, Overhaul). |
|
| Low reverse/overdrive (4, 5, 6) clutch latch valve stuck OFF |
DISASSEMBLE, CLEAN and INSPECT the low/reverse
clutch latch valve and spring. If bore, valve or spring is damaged,
INSTALL a new main control valve body. REFER to: Main Control Valve Body (307-01A Automatic Transmission - 6-Speed Automatic Transmission – 6F15, Overhaul). REFER to: Main Control Valve Body (307-01B Automatic Transmission - 6-Speed Automatic Transmission – 6F35, Overhaul). |
|
| VBS CBR1/456, CBR1/456, CBR1 hydraulic circuits blocked or 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 - 6-Speed Automatic Transmission – 6F15, Overhaul). REFER to: Main Control Valve Body (307-01B Automatic Transmission - 6-Speed Automatic Transmission – 6F35, Overhaul). |
|
| Low/Reverse clutch friction plates |
DISASSEMBLE and INSPECT the low/reverse clutch
friction and steel plates. INSTALL new components as necessary. REFER to: Transmission (307-01A Automatic Transmission - 6-Speed Automatic Transmission – 6F15, Overhaul). REFER to: Transmission (307-01A Automatic Transmission - 6-Speed Automatic Transmission – 6F15, Overhaul). |
|
| Low/Reverse clutch piston return spring |
INSPECT the return spring for proper installation and damage. INSTALL new components as necessary. REFER to: Transmission (307-01A Automatic Transmission - 6-Speed Automatic Transmission – 6F15, Overhaul). REFER to: Transmission (307-01A Automatic Transmission - 6-Speed Automatic Transmission – 6F15, Overhaul). |
|
| - | Center support cracked or leaking. |
INSPECT the center support for damage. INSTALL new components as necessary. REFER to: Transmission (307-01A Automatic Transmission - 6-Speed Automatic Transmission – 6F15, Overhaul). REFER to: Transmission (307-01A Automatic Transmission - 6-Speed Automatic Transmission – 6F15, Overhaul). |
Diagnosis and Testing - Intermediate Clutch Assembly
Intermediate Clutch
For intermediate (2,6) clutch operation, REFER to: Transmission
Description (307-01B Automatic Transmission - 6-Speed Automatic
Transmission – 6F35, Description and Operation)...
Diagnosis and Testing - Overdrive Clutch Assembly
Overdrive Clutch
For overdrive clutch operation, REFER to: Transmission
Description (307-01A Automatic Transmission - 6-Speed Automatic
Transmission – 6F15, Description and Operation)...
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Materials
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Removal
NOTE: Removal steps in this procedure may contain installation details.
With the vehicle in NEUTRAL, position it on a hoist.Refer to: Jacking and Lifting - Overview (100-02 Jacking and Lifting, Description and Operation).
If equipped, remove the bolts and the underbody shield.
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