| 307-01A Automatic Transmission - Vehicles With: 6-Speed Automatic Transmission - 6F50 | 2013 - 2014 MKZ |
| Diagnosis and Testing | Procedure revision date: 09/28/2012 |
Low/Reverse Clutch
For low/reverse clutch operation,
REFER to:
Low/Reverse Clutch Assembly
(307-01A Automatic Transmission - Vehicles With: 6-Speed Automatic Transmission - 6F50, Description and Operation).
Low/Reverse Clutch
| Condition | Possible Sources | Action |
| Low/Reverse clutch does not apply | Solenoid body filter blocked to Shift Solenoid D (SSD) |
CLEAN or INSTALL a new solenoid body filter screen.
REFER to: Solenoid Body (307-01A Automatic Transmission - Vehicles With: 6-Speed Automatic Transmission - 6F50, Removal and Installation). |
| Shift Solenoid D (SSD) is mechanically stuck OFF |
INSTALL a new solenoid body.
REFER to: Solenoid Body (307-01A Automatic Transmission - Vehicles With: 6-Speed Automatic Transmission - 6F50, Removal and Installation). PERFORM the Transmission Strategy Download, REFER to: Transmission Strategy Download (307-01A Automatic Transmission - Vehicles With: 6-Speed Automatic Transmission - 6F50, General Procedures). |
|
| Low/Reverse clutch (CBLR/C456) regulator valve stuck OFF |
REMOVE the main control valve body.
REFER to: Main Control Valve Body (307-01A Automatic Transmission - Vehicles With: 6-Speed Automatic Transmission - 6F50, Removal and Installation). DISASSEMBLE, CLEAN and INSPECT the low/reverse clutch regulator valve. REFER to: Main Control Valve Body (307-01A Automatic Transmission - Vehicles With: 6-Speed Automatic Transmission - 6F50, Removal and Installation). If bore or valve is damaged, INSTALL a new main control. REFER to: Main Control Valve Body (307-01A Automatic Transmission - Vehicles With: 6-Speed Automatic Transmission - 6F50, Removal and Installation). |
|
| Shift Solenoid D (SSD) SIG, CBLR/C456 SUPPLY, CBLR SUPPLY hydraulic circuits blocked/leaking |
REMOVE the main control valve body.
REFER to: Main Control Valve Body (307-01A Automatic Transmission - Vehicles With: 6-Speed Automatic Transmission - 6F50, Removal and Installation). DISASSEMBLE and INSPECT the main control valve body and separator plate passages for debris/blockage. REFER to: Main Control Valve Body (307-01A Automatic Transmission - Vehicles With: 6-Speed Automatic Transmission - 6F50, Removal and Installation). CLEAN as necessary. |
|
| REV/Shift Solenoid E (SSE) SIG to multiplex shift valve shuttle ball missing/damaged |
REMOVE the main control valve body.
REFER to: Main Control Valve Body (307-01A Automatic Transmission - Vehicles With: 6-Speed Automatic Transmission - 6F50, Removal and Installation). INSPECT the check ball missing/damage. REFER to: Main Control Valve Body (307-01A Automatic Transmission - Vehicles With: 6-Speed Automatic Transmission - 6F50, Removal and Installation). |
|
| Multiplex shift valve stuck in default position |
REMOVE the main control valve body.
REFER to: Main Control Valve Body (307-01A Automatic Transmission - Vehicles With: 6-Speed Automatic Transmission - 6F50, Removal and Installation). DISASSEMBLE, CLEAN and INSPECT the multiplex shift valve. REFER to: Main Control Valve Body (307-01A Automatic Transmission - Vehicles With: 6-Speed Automatic Transmission - 6F50, Removal and Installation). If bore or valve is damaged, INSTALL a new main control valve body. REFER to: Main Control Valve Body (307-01A Automatic Transmission - Vehicles With: 6-Speed Automatic Transmission - 6F50, Removal and Installation). |
|
| CBLR supply hydraulic circuit blocked or leaking |
DISASSEMBLE and INSPECT the transmission cover passages for debris/blockage.
REFER to: Transmission (307-01A Automatic Transmission - Vehicles With: 6-Speed Automatic Transmission - 6F50, Disassembly). CLEAN as necessary. |
|
| 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 necessary.
REFER to: Transmission (307-01A Automatic Transmission - Vehicles With: 6-Speed Automatic Transmission - 6F50, Disassembly). |
|
| 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 - Vehicles With: 6-Speed Automatic Transmission - 6F50, Disassembly). |
|
| Low/Reverse clutch piston seal leakage |
INSTALL a new low/reverse clutch piston and seals.
REFER to: Transmission (307-01A Automatic Transmission - Vehicles With: 6-Speed Automatic Transmission - 6F50, Disassembly). |
|
| Low/Reverse clutch always applied | Solenoid body filter seal damaged at Shift Solenoid D (SSD) |
INSTALL a new solenoid body filter screen.
REFER to: Solenoid Body (307-01A Automatic Transmission - Vehicles With: 6-Speed Automatic Transmission - 6F50, Removal and Installation). |
| Shift Solenoid D (SSD) mechanically stuck ON |
INSTALL a new solenoid body.
REFER to: Solenoid Body (307-01A Automatic Transmission - Vehicles With: 6-Speed Automatic Transmission - 6F50, Removal and Installation). PERFORM the Transmission Strategy Download, REFER to: Transmission Strategy Download (307-01A Automatic Transmission - Vehicles With: 6-Speed Automatic Transmission - 6F50, General Procedures). |
|
| Low/Reverse clutch (CBLR/C456) regulator valve stuck ON |
REMOVE the main control valve body.
REFER to: Main Control Valve Body (307-01A Automatic Transmission - Vehicles With: 6-Speed Automatic Transmission - 6F50, Removal and Installation). DISASSEMBLE, CLEAN and INSPECT the low/reverse clutch regulator valve and bias spring. REFER to: Main Control Valve Body (307-01A Automatic Transmission - Vehicles With: 6-Speed Automatic Transmission - 6F50, Removal and Installation). If bore or valve is damaged, INSTALL a new main control valve body. REFER to: Main Control Valve Body (307-01A Automatic Transmission - Vehicles With: 6-Speed Automatic Transmission - 6F50, Removal and Installation). |
|
| Shift Solenoid D (SSD) SIG, CBLR/C456 SUPPLY, CBLR SUPPLY hydraulic circuits blocked/leaking |
REMOVE the main control valve body.
REFER to: Main Control Valve Body (307-01A Automatic Transmission - Vehicles With: 6-Speed Automatic Transmission - 6F50, Removal and Installation). DISASSEMBLE and INSPECT the main control valve body and separator plate passages for leakage. REFER to: Main Control Valve Body (307-01A Automatic Transmission - Vehicles With: 6-Speed Automatic Transmission - 6F50, Removal and Installation). CLEAN as necessary. |
|
| 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 - Vehicles With: 6-Speed Automatic Transmission - 6F50, Disassembly). |
|
| 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 - Vehicles With: 6-Speed Automatic Transmission - 6F50, Disassembly). |
|
| Low/Reverse clutch piston return spring |
INSPECT the return spring for damage. INSTALL new components as necessary.
REFER to: Transmission (307-01A Automatic Transmission - Vehicles With: 6-Speed Automatic Transmission - 6F50, Disassembly). |
|
| Low/Reverse clutch delayed/soft/slipping apply | Incorrect Transmission Strategy programmed into PCM |
PERFORM the Transmission Strategy Download,
REFER to: Transmission Strategy Download (307-01A Automatic Transmission - Vehicles With: 6-Speed Automatic Transmission - 6F50, General Procedures). |
| Solenoid body filter seal damaged at Shift Solenoid D (SSD) |
INSTALL a new solenoid body filter screen.
REFER to: Solenoid Body (307-01A Automatic Transmission - Vehicles With: 6-Speed Automatic Transmission - 6F50, Removal and Installation). |
|
| Shift Solenoid D (SSD) mechanically sticking |
INSTALL a new solenoid body.
REFER to: Solenoid Body (307-01A Automatic Transmission - Vehicles With: 6-Speed Automatic Transmission - 6F50, Removal and Installation). PERFORM the Transmission Strategy Download, REFER to: Transmission Strategy Download (307-01A Automatic Transmission - Vehicles With: 6-Speed Automatic Transmission - 6F50, General Procedures). |
|
| Low/Reverse clutch (CBLR/C456) regulator valve sticking |
REMOVE the main control valve body.
REFER to: Main Control Valve Body (307-01A Automatic Transmission - Vehicles With: 6-Speed Automatic Transmission - 6F50, Removal and Installation). DISASSEMBLE, CLEAN and INSPECT the low/reverse clutch regulator valve. REFER to: Main Control Valve Body (307-01A Automatic Transmission - Vehicles With: 6-Speed Automatic Transmission - 6F50, Removal and Installation). If bore or valve is damaged, INSTALL a new main control valve body. REFER to: Main Control Valve Body (307-01A Automatic Transmission - Vehicles With: 6-Speed Automatic Transmission - 6F50, Removal and Installation). |
|
| Low/Reverse clutch (CBLR/C456) boost valve stuck ON |
REMOVE the main control valve body.
REFER to: Main Control Valve Body (307-01A Automatic Transmission - Vehicles With: 6-Speed Automatic Transmission - 6F50, Removal and Installation). DISASSEMBLE, CLEAN and INSPECT the low/reverse clutch boost valve. REFER to: Main Control Valve Body (307-01A Automatic Transmission - Vehicles With: 6-Speed Automatic Transmission - 6F50, Removal and Installation). If bore or valve is damaged, INSTALL a new main control valve body. REFER to: Main Control Valve Body (307-01A Automatic Transmission - Vehicles With: 6-Speed Automatic Transmission - 6F50, Removal and Installation). |
|
| Shift Solenoid D (SSD) SIG, CBLR/C456 SUPPLY, CBLR SUPPLY hydraulic circuits blocked/leaking |
REMOVE the main control valve body.
REFER to: Main Control Valve Body (307-01A Automatic Transmission - Vehicles With: 6-Speed Automatic Transmission - 6F50, Removal and Installation). DISASSEMBLE and INSPECT the main control and separator plate passages for debris/blockage. REFER to: Main Control Valve Body (307-01A Automatic Transmission - Vehicles With: 6-Speed Automatic Transmission - 6F50, Removal and Installation). CLEAN as necessary. |
|
| REV/Shift Solenoid E (SSE) SIG to multiplex shift valve shuttle ball missing/damaged |
REMOVE the main control valve body.
REFER to: Main Control Valve Body (307-01A Automatic Transmission - Vehicles With: 6-Speed Automatic Transmission - 6F50, Removal and Installation). REMOVE the main control valve body and INSPECT the check ball missing/damage. REFER to: Main Control Valve Body (307-01A Automatic Transmission - Vehicles With: 6-Speed Automatic Transmission - 6F50, Removal and Installation). |
|
| CBLR supply hydraulic circuit blocked or leaking |
DISASSEMBLE and INSPECT the transmission cover passages for debris/blockage.
REFER to: Transmission (307-01A Automatic Transmission - Vehicles With: 6-Speed Automatic Transmission - 6F50, Disassembly). CLEAN as necessary. |
|
| 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 - Vehicles With: 6-Speed Automatic Transmission - 6F50, Disassembly). |
|
| Low/Reverse clutch piston seal leakage |
INSTALL a new low/reverse clutch piston and seals.
REFER to: Transmission (307-01A Automatic Transmission - Vehicles With: 6-Speed Automatic Transmission - 6F50, Disassembly). |
|
| Low/Reverse clutch harsh apply | Incorrect Transmission Strategy programmed into PCM |
PERFORM the Transmission Strategy Download,
REFER to: Transmission Strategy Download (307-01A Automatic Transmission - Vehicles With: 6-Speed Automatic Transmission - 6F50, General Procedures). |
| Shift Solenoid D (SSD) mechanically sticking |
INSTALL a new solenoid body.
REFER to: Solenoid Body (307-01A Automatic Transmission - Vehicles With: 6-Speed Automatic Transmission - 6F50, Removal and Installation). PERFORM the Transmission Strategy Download, REFER to: Transmission Strategy Download (307-01A Automatic Transmission - Vehicles With: 6-Speed Automatic Transmission - 6F50, General Procedures). |
|
| Low/Reverse clutch regulator valve sticking |
REMOVE the main control valve body.
REFER to: Main Control Valve Body (307-01A Automatic Transmission - Vehicles With: 6-Speed Automatic Transmission - 6F50, Removal and Installation). DISASSEMBLE, CLEAN and INSPECT the low/reverse clutch regulator valve and bias spring. REFER to: Main Control Valve Body (307-01A Automatic Transmission - Vehicles With: 6-Speed Automatic Transmission - 6F50, Removal and Installation). If bore, valve or spring is damaged, INSTALL a new main control valve body. REFER to: Main Control Valve Body (307-01A Automatic Transmission - Vehicles With: 6-Speed Automatic Transmission - 6F50, Removal and Installation). |
|
| Low/Reverse clutch (CBLR/C456) boost valve sticking |
REMOVE the main control valve body.
REFER to: Main Control Valve Body (307-01A Automatic Transmission - Vehicles With: 6-Speed Automatic Transmission - 6F50, Removal and Installation). DISASSEMBLE, CLEAN and INSPECT the low/reverse clutch boost valve and bias spring. REFER to: Main Control Valve Body (307-01A Automatic Transmission - Vehicles With: 6-Speed Automatic Transmission - 6F50, Removal and Installation). If bore, valve or spring is damaged, INSTALL a new main control valve body. REFER to: Main Control Valve Body (307-01A Automatic Transmission - Vehicles With: 6-Speed Automatic Transmission - 6F50, Removal and Installation). |
|
| Shift Solenoid D (SSD) SIG, CBLR/C456 SUPPLY, CBLR SUPPLY hydraulic circuits blocked/leaking |
REMOVE the main control valve body.
REFER to: Main Control Valve Body (307-01A Automatic Transmission - Vehicles With: 6-Speed Automatic Transmission - 6F50, Removal and Installation). DISASSEMBLE and INSPECT the main control valve body and separator plate passages for debris/blockage. REFER to: Main Control Valve Body (307-01A Automatic Transmission - Vehicles With: 6-Speed Automatic Transmission - 6F50, Removal and Installation). CLEAN as necessary. |
|
| 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 - Vehicles With: 6-Speed Automatic Transmission - 6F50, Disassembly). |
|
| 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 - Vehicles With: 6-Speed Automatic Transmission - 6F50, Disassembly). |
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