| 307-01A Automatic Transmission - Vehicles With: 6-Speed Automatic Transmission - 6F50 | 2013 - 2014 MKZ |
| Diagnosis and Testing | Procedure revision date: 09/28/2012 |
Symptom Chart
Forward Clutch
For forward (1,2,3,4) clutch operation,
REFER to:
Forward Clutch Assembly
(307-01A Automatic Transmission - Vehicles With: 6-Speed Automatic Transmission - 6F50, Description and Operation).
Forward Clutch
| Condition | Possible Sources | Action |
| Forward (1,2,3,4) clutch does not apply | Solenoid body filter blocked to Shift Solenoid A (SSA) |
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 A (SSA) 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). |
|
| Forward (1,2,3,4) clutch 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 forward (1,2,3,4) 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). |
|
| Shift Solenoid A (SSA) SIG, CB1234, CB1234 SUP 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. |
|
| CB1234 seal 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). INSPECT the CB1234 circuit seal between the main control valve body and the transmission case for missing or damaged seal. INSTALL a new seal. |
|
| Front planetary sun gear and shell assembly |
INSPECT the sun gear and shell for wear and damage. INSTALL new components as necessary.
REFER to: Transmission (307-01A Automatic Transmission - Vehicles With: 6-Speed Automatic Transmission - 6F50, Disassembly). |
|
| Low One-Way Clutch (OWC) snap ring |
INSPECT the low One-Way Clutch (OWC) snap ring for proper seating in case.
REFER to: Transmission (307-01A Automatic Transmission - Vehicles With: 6-Speed Automatic Transmission - 6F50, Disassembly). |
|
| Low One-Way Clutch (OWC)/Forward (1,2,3,4) clutch steel plate |
DISASSEMBLE and INSPECT the forward (1,2,3,4) clutch steel plates. INSTALL new components as necessary.
REFER to: Transmission (307-01A Automatic Transmission - Vehicles With: 6-Speed Automatic Transmission - 6F50, Disassembly). |
|
| Low One-Way Clutch (OWC)/Forward (1,2,3,4) clutch friction plates |
DISASSEMBLE and INSPECT the forward (1,2,3,4) 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). |
|
| Forward (1,2,3,4) clutch piston seal leakage. |
INSTALL a new forward (1,2,3,4) clutch piston.
REFER to: Transmission (307-01A Automatic Transmission - Vehicles With: 6-Speed Automatic Transmission - 6F50, Disassembly). |
|
| Forward (1,2,3,4) clutch always applied | Solenoid body filter seal damaged at Shift Solenoid A (SSA) |
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 A (SSA) 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). |
|
| Forward (1,2,3,4) clutch 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 forward (1,2,3,4) 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). |
|
| Shift Solenoid A (SSA) SIG, CB1234, CB1234 SUP 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. INSPECT the CB1234 check ball for blocked passage. REFER to: Main Control Valve Body (307-01A Automatic Transmission - Vehicles With: 6-Speed Automatic Transmission - 6F50, Removal and Installation). CLEAN as necessary. |
|
| Front planetary sun gear and shell assembly |
INSPECT the sun gear and shell for wear and damage. INSTALL new components necessary.
REFER to: Transmission (307-01A Automatic Transmission - Vehicles With: 6-Speed Automatic Transmission - 6F50, Disassembly). |
|
| Forward (1,2,3,4) clutch friction plates |
DISASSEMBLE and INSPECT the forward (1,2,3,4) 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). |
|
| Forward (1,2,3,4) 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). |
|
| Forward (1,2,3,4) 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 A (SSA) |
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 A (SSA) mechanically stuck |
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). |
|
| Forward (1,2,3,4) 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 forward (1,2,3,4) 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). |
|
| Forward (1,2,3,4) clutch 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 forward (1,2,3,4) 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 A (SSA) SIG, CB1234, CB1234 SUP 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. |
|
| CB1234 seal 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). INSPECT the CB1234 circuit seal between the main control valve body and the transmission case for missing or damaged seal. INSTALL a new seal. REFER to: Main Control Valve Body (307-01A Automatic Transmission - Vehicles With: 6-Speed Automatic Transmission - 6F50, Removal and Installation). |
|
| Low One-Way Clutch (OWC)/Forward (1,2,3,4) clutch pressure plate |
DISASSEMBLE and INSPECT the low One-Way Clutch (OWC)/forward (1,2,3,4) clutch pressure plate. INSTALL new components as necessary.
REFER to: Transmission (307-01A Automatic Transmission - Vehicles With: 6-Speed Automatic Transmission - 6F50, Disassembly). |
|
| Forward (1,2,3,4) clutch friction plates |
DISASSEMBLE and INSPECT the forward (1,2,3,4) 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). |
|
| Forward (1,2,3,4) 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). |
|
| Forward (1,2,3,4) 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 A (SSA) 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). |
|
| Forward (1,2,3,4) 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 forward (1,2,3,4) 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). |
|
| Forward (1,2,3,4) clutch 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 forward (1,2,3,4) 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 A (SSA) SIG, CB1234, CB1234 SUP 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 leakage. INSPECT CB1234 check ball for blocked passage. CLEAN as necessary. |
|
| Forward (1,2,3,4) 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). |
|
| Forward (1,2,3,4) clutch friction plates |
DISASSEMBLE and INSPECT the forward (1,2,3,4) 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). |
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