The solenoids are activated in a specific pattern to control shifting and the lock-up function. Solenoids S1 and S2 determine which gear is to be used at the time. Solenoids SL and STH determine engagement by adjusting the hydraulic line pressure of the transmission. The basic parameters for the different shifting points are the accelerator pedal (AP) position and the vehicle speed. The shift quality is decided by the control of torque and pressure control of the STH solenoid.

The pressurization of the clutches and the brakes are adjusted by reading the changes of the speed of the transmission input shaft during the shifting process and comparing them to the values calculated in the transmission control module (TCM).

Two shifting patterns can be selected, normal conditions and winter mode (selected using the button).

In normal mode shifting and lock-up occur at relatively low engine speeds to reduce fuel consumption. In the event of rapid accelerator pedal movements, the transmission control module (TCM) automatically shifts to sport mode.

Shifting patterns

Gear	Activated solenoid
Gear	S1	S2
1	ON	ON
2	OFF	ON
3	OFF	OFF
4	ON	OFF
R	ON	ON

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.

Safety Warning

Controlling The Shift Solenoids When Shifting

Use the Manual With the Right Hardware

When to See a Mechanic