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.
Shift Performance Curve Control
The shift performance curve control performs when the following conditions are satisfied.
- Engine coolant temperature at starting: 50 deg.C (122 deg.F) or less
- Vehicle speed: 53 km/h (32.9 MPH) or less
The shift performance curve control is performed to raise the temperature of catalyst to the operating temperature in a short period of time after engine start.
ECM requests TCM to change shift performance curves according to the following sensor and signal.
- Engine coolant temperature sensor
- ABS actuator and electric unit (control unit) (each wheel speed)
The shift performance curve control works only electrically and operates for 160 seconds at a maximum. ECM requests TCM to change shift performance curves via drivetrain CAN communication. For low or medium load state, gear shifting is performed when engine speed is higher or vehicle speed is faster.
Use the Manual With the Right Hardware
Pair factory procedures with proven DIY tools so the instructions are easier to execute.
Disclosure: Verified tool recommendations may earn an affiliate commission at no cost to you.
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.
Rather have a pro handle this?
A certified mobile mechanic comes to your home or office. They bring the tools, you stay comfortable. No tow truck, no waiting room, no surprises.
No obligation. See pricing before you book.