Symptom Chart
For selectable one-way clutch operation,
REFER to: Hydraulic
Selectable One-Way Clutch Assembly (307-01A Automatic Transmission -
8-Speed Automatic Transmission – 8F35/8F40, Description and Operation).
Hydraulic Selectable One-Way Clutch (OWC)
Condition | Possible Sources | Action |
Selectable one-way clutch (OWC) does not apply | SSD is mechanically stuck off |
INSTALL a new solenoid. REFER to: Solenoid (307-01A Automatic Transmission - 8-Speed Automatic Transmission – 8F35/8F40, Removal and Installation). |
Hydraulic selectable one way clutch (OWC) control or limit valve valve stuck off |
DISASSEMBLE, CLEAN and INSPECT the control
valve. If the bore or valve is damaged, INSTALL a new main control valve
body. REFER to: Main Control Valve Body (307-01A Automatic Transmission - 8-Speed Automatic Transmission – 8F35/8F40, Removal and Installation). PERFORM the Transmission Strategy Download,REFER to: Transmission Strategy Download (307-01A Automatic Transmission - 8-Speed Automatic Transmission – 8F35/8F40, General Procedures). |
|
SOWC APPLY hydraulic circuit blocked/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 - 8-Speed Automatic Transmission – 8F35/8F40, Removal and Installation). |
|
Hydraulic selectable one-way clutch (OWC) actuator |
INSPECT the components for wear and damage. INSTALL new components as necessary. REFER to: Transmission (307-01A Automatic Transmission - 8-Speed Automatic Transmission – 8F35/8F40, Overhaul). |
|
Hydraulic Selectable one-way clutch (OWC) always applied | SSD mechanically stuck |
INSTALL a new solenoid. REFER to: Solenoid (307-01A Automatic Transmission - 8-Speed Automatic Transmission – 8F35/8F40, Removal and Installation). |
Hydraulic selectable one way clutch (OWC) control or limit valve valve stuck on |
DISASSEMBLE, CLEAN and INSPECT the control
valve. If the bore or valve is damaged, INSTALL a new main control valve
body. REFER to: Main Control Valve Body (307-01A Automatic Transmission - 8-Speed Automatic Transmission – 8F35/8F40, Removal and Installation). PERFORM the Transmission Strategy Download, REFER to: Transmission Strategy Download (307-01A Automatic Transmission - 8-Speed Automatic Transmission – 8F35/8F40, General Procedures). |
|
Hydraulic selectable one-way clutch (OWC) actuator |
INSPECT the components for wear and damage. INSTALL new components as necessary. REFER to: Transmission (307-01A Automatic Transmission - 8-Speed Automatic Transmission – 8F35/8F40, Overhaul). |
Selecting a Drive Mode
Note: Drive mode changes may not be available when the ignition is off.