Safety Warning
DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.
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HOMESERVICE MANUALSSUBARU2007FORESTER F4-2.5L SOHCREPAIR AND DIAGNOSISPOWERTRAIN MANAGEMENTTRANSMISSION CONTROL SYSTEMSDESCRIPTION AND OPERATIONAUTOMATIC TRANSMISSION (5 AT)AWD CENTER DIFFERENTIAL CONTROL
2007 Subaru Forester F4-2.5L SOHC
AWD Center Differential Control
2007 Subaru Forester F4-2.5L SOHCSECTION AWD Center Differential Control
AWD CENTER DIFFERENTIAL CONTROL
CONTROL DESCRIPTION
Engagement of the multi-plate clutch (LSD) in the center differential is controlled according to the torque input to the transfer. It selects a map according to driving conditions and use it as the control basis.
NORMAL CONTROL
The input torque to the multi-plate clutch is calculated according to various factors such as engine torque signals, torque converter turbine speed and selected gear position. Based on the calculation result, the basic coupling force of the clutch is determined.
START CONTROL
When the vehicle speed is 0 km/h (0 MPH), the TCM increases the engaging force of the multi-plate clutch to a higher level compared to that of normal control.
This enables the vehicle to start smoothly without swerving even on a slippery road.
TURNING CONTROL
The TCM makes a correction such that the engagement force of the multi-plate clutch is reduced as the steering angle increases.
This function is performed to improve turning performance at certain vehicle speed range.
SLIP CONTROL
When front or rear wheels start slipping with the vehicle running slower than the predetermined speed, the TCM makes control to increase the differential action limiting torque. This function maintains traction and improves driving stability.
ABS CONTROL
When the TCM receives an ASS operation signal from the ASSCM, it adjusts the differential action limiting torque to the predetermined level.
This function improves ASS control.
BASE BRAKE CONTROL
When the brake switch is ON and the throttle valve is fully closed, the TCM makes control to decrease the differential action limiting torque. The ASS control has priority over this control.
This function improves stability during braking.
CONTROL DESCRIPTION
Engagement of the multi-plate clutch (LSD) in the center differential is controlled according to the torque input to the transfer. It selects a map according to driving conditions and use it as the control basis.
NORMAL CONTROL
The input torque to the multi-plate clutch is calculated according to various factors such as engine torque signals, torque converter turbine speed and selected gear position. Based on the calculation result, the basic coupling force of the clutch is determined.
START CONTROL
When the vehicle speed is 0 km/h (0 MPH), the TCM increases the engaging force of the multi-plate clutch to a higher level compared to that of normal control.
This enables the vehicle to start smoothly without swerving even on a slippery road.
TURNING CONTROL
The TCM makes a correction such that the engagement force of the multi-plate clutch is reduced as the steering angle increases.
This function is performed to improve turning performance at certain vehicle speed range.
SLIP CONTROL
When front or rear wheels start slipping with the vehicle running slower than the predetermined speed, the TCM makes control to increase the differential action limiting torque. This function maintains traction and improves driving stability.
ABS CONTROL
When the TCM receives an ASS operation signal from the ASSCM, it adjusts the differential action limiting torque to the predetermined level.
This function improves ASS control.
BASE BRAKE CONTROL
When the brake switch is ON and the throttle valve is fully closed, the TCM makes control to decrease the differential action limiting torque. The ASS control has priority over this control.
This function improves stability during braking.
RENDER: 1.0x
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When to See a Mechanic
Stop DIY work and contact a certified mechanic immediately if any of the following apply:
- • You smell fuel, burning insulation, or see smoke.
- • Brakes feel soft, pull hard to one side, or make grinding noises.
- • The engine overheats, stalls repeatedly, or misfires under load.
- • You are missing required tools, torque specs, or safe lifting equipment.
- • You are not confident in the next step or safety outcome.