| Symptom |
Possible Sources |
Action |
|
|
- Solenoid filter blocked to the TCC solenoid
|
- INSTALL a new TCC solenoid.
REFER to: Solenoid (307-01A Automatic Transmission - 8-Speed Automatic Transmission – 8F35/8F40, Removal and Installation).
|
|
|
-
TCC solenoid mechanically stuck off
|
- INSTALL a new TCC solenoid.
REFER to: Solenoid (307-01A Automatic Transmission - 8-Speed Automatic Transmission – 8F35/8F40, Removal and Installation).
|
|
|
-
TCC regulator valve stuck off
|
- DISASSEMBLE, CLEAN and INSPECT the TCC
regulator valve. If the bore or valve is damaged or if the spring is
damaged or missing, INSTALL a new main control valve body.
REFER to: Main Control Valve Body (307-01A Automatic Transmission - 8-Speed Automatic Transmission – 8F35/8F40, Overhaul).
|
|
|
- Pump stator bushing and/or input shaft worn
|
- REMOVE, CLEAN and INSPECT the pump assembly, the input shaft
and the torque converter. If the pump stator bushing and/or the input
shaft are worn, INSTALL a new pump assembly, input shaft and torque
converter.
REFER to: Transmission (307-01A Automatic Transmission - 8-Speed Automatic Transmission – 8F35/8F40, Overhaul).
|
|
|
- TCC APPLY hydraulic circuit blocked or leaking
|
- DISASSEMBLE and INSPECT the transmission, main control and
pump assembly passages for debris/blockage. CLEAN as necessary. INSPECT
the TCC hydraulic circuits for leaks.
REFER to: Main Control Valve Body (307-01A Automatic Transmission - 8-Speed Automatic Transmission – 8F35/8F40, Overhaul).
REFER to: Transmission (307-01A Automatic Transmission - 8-Speed Automatic Transmission – 8F35/8F40, Overhaul).
REFER to: Torque Converter Clutch (TCC) (307-01A Automatic Transmission
- 8-Speed Automatic Transmission – 8F35/8F40, Description and
Operation).
|
|
|
-
TCC friction material worn or damaged.
|
- INSTALL a new torque converter.
REFER to: Transmission (307-01A Automatic Transmission - 8-Speed Automatic Transmission – 8F35/8F40, Removal and Installation).
|
-
TCC always applied/stalls vehicle
|
-
TCC solenoid mechanically stuck on
|
- INSTALL a new TCC solenoid.
REFER to: Solenoid (307-01A Automatic Transmission - 8-Speed Automatic Transmission – 8F35/8F40, Removal and Installation).
|
|
|
-
TCC regulator valve stuck on
|
- DISASSEMBLE, CLEAN and INSPECT the TCC
regulator valve. If the bore or valve is damaged or if the spring is
damaged or missing, INSTALL a new main control valve body.
REFER to: Main Control Valve Body (307-01A Automatic Transmission - 8-Speed Automatic Transmission – 8F35/8F40, Overhaul).
|
|
|
- TCC RELEASE hydraulic circuit blocked or leaking
|
- DISASSEMBLE and INSPECT the transmission, main control and
pump assembly passages for debris/blockage. CLEAN as necessary. INSPECT
the TCC hydraulic circuits for leaks.
REFER to: Main Control Valve Body (307-01A Automatic Transmission - 8-Speed Automatic Transmission – 8F35/8F40, Overhaul).
REFER to: Transmission (307-01A Automatic Transmission - 8-Speed Automatic Transmission – 8F35/8F40, Overhaul).
REFER to: Torque Converter Clutch (TCC) (307-01A Automatic Transmission
- 8-Speed Automatic Transmission – 8F35/8F40, Description and
Operation).
|
|
|
|
- INSTALL a new torque converter.
REFER to: Transmission (307-01A Automatic Transmission - 8-Speed Automatic Transmission – 8F35/8F40, Removal and Installation).
|
-
TCC cycles, shudders or chatters
|
- Incorrect Transmission Strategy programmed into the PCM / TCM
|
- PERFORM transmission strategy download and the adaptive learning drive cycle.
REFER
to: Transmission Strategy Download (307-01A Automatic Transmission -
8-Speed Automatic Transmission – 8F35/8F40, General Procedures).
REFER to: Adaptive Learning Drive Cycle (307-01A Automatic Transmission
- 8-Speed Automatic Transmission – 8F35/8F40, General Procedures).
|
|
|
-
TCC solenoid filter or seal damaged at TCC solenoid
|
- INSTALL a new TCC solenoid.
REFER to: Solenoid (307-01A Automatic Transmission - 8-Speed Automatic Transmission – 8F35/8F40, Removal and Installation).
|
|
|
-
TCC solenoid mechanically sticking
|
- INSTALL a new TCC solenoid.
REFER to: Solenoid (307-01A Automatic Transmission - 8-Speed Automatic Transmission – 8F35/8F40, Removal and Installation).
|
|
|
-
TCC regulator valve, springs, clips loose, stuck, binding, missing, misassembled
|
- DISASSEMBLE, CLEAN and INSPECT the TCC
regulator valve. If the bore or valve is damaged or if the spring is
damaged or missing, INSTALL a new main control valve body.
REFER to: Main Control Valve Body (307-01A Automatic Transmission - 8-Speed Automatic Transmission – 8F35/8F40, Overhaul).
|
|
|
-
TCC RELEASE/TCC APPLY hydraulic circuit blocked or leaking
|
- DISASSEMBLE and INSPECT the transmission, main control and pump
assembly for debris/blockage. CLEAN as necessary. INSPECT the TCC
hydraulic circuits for leaks
REFER to: Main Control Valve Body (307-01A Automatic Transmission - 8-Speed Automatic Transmission – 8F35/8F40, Overhaul).
REFER to: Transmission (307-01A Automatic Transmission - 8-Speed Automatic Transmission – 8F35/8F40, Overhaul).
REFER to: Torque Converter Clutch (TCC) (307-01A Automatic Transmission
- 8-Speed Automatic Transmission – 8F35/8F40, Description and
Operation).
|
|
|
-
TCC cycling/shudder/chatter
|
- VERIFY the TCC is causing the concern. ATTEMPT to duplicate event
while commanding the PID TCC_OSC OFF. If the concern cannot be
duplicated while the TCC is commanded off the TCC may be worn or
damaged. INSTALL a new torque converter.
REFER to: Transmission (307-01A Automatic Transmission - 8-Speed
Automatic Transmission – 8F35/8F40, Removal and Installation).
|
Diagnosis and Testing - F Clutch
General Procedures - Adaptive Learning Drive Cycle