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.
Closed Loop Control
The ratio control system is a closed loop system utilizing a Proportional - Integral - Derivative (PID) controller (part of the TCM) to compensate for differences between commanded speed ratio and actual speed ratio. The PID controller utilizes the combination of proportional control action, integral control action, and derivative control action to continually adjust ratio control motor step counts in an attempt to maintain zero difference between commanded counts and actual counts. Commanded speed ratio is determined from the difference between desired speed ratio and the last commanded speed ratio. This difference is used to determine the rate at which commanded speed ratio converges to desired speed ratio. The difference between commanded speed ratio (converted to RCM counts) and actual speed ratio (converted to RCM counts) is used as the input to the PID controller which modifies the step counts of the ratio control actuator.
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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.