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.
Regulating The Solenoids When GEARSHIFTING
Shifting is regulated by the transmission control module activating the solenoids in a specific pattern. The solenoids and control which gear is engaged. The solenois also control how engagement occurs by adapting hydraulic pressure. The basic parameters for the various shift points are accelerator pedal position and vehicle speed while shift quality is determined by torque control.
The pressurizing of clutches and brakes can be adapted by means of reading off the changes in the rotation speed of the transmission input shaft during the gearshift processes and comparing them with the calculated values in the Transmission Control Module.
Two different shift patterns are available: normal mode and winter mode.
In normal conditions the gearshifts take place at relatively low speeds in order to reduce fuel consumption. With rapid accelerator pedal movements the Transmission Control Module automatically changes over to sport mode.
| Gear | Activated solenoid | |||||
| OFF | OFF | ON | ON | ON | ON | |
| OFF | OFF | ON | ON | OFF | ON | |
| OFF | OFF | ON | ON | ON | ON | |
| OFF | OFF | ON | ON | ON | ON | |
| OFF | OFF | OFF | ON | ON | ON | |
| *) | ON | ON | OFF | ON | ON | ON |
| OFF | OFF | OFF | ON | ON | OFF | |
| OFF | OFF | OFF | ON | OFF | ON | |
| OFF | OFF | OFF | OFF | ON | ON | |
| OFF | OFF | ON | OFF | OFF | ON | |
| OFF | OFF | ON | OFF | ON | OFF | |
*) with engine braking
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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.