Neutral Idle Description and Operation

Neutral Idle Description and Operation

Neutral Idle can only be commanded ON when the transmission is operating in Drive Range, First Gear Engine Braking (Gen 1) Drive Range, First Gear Engine Braking (Gen 1)Drive Range, First Gear Engine Braking (Gen 2/Hybrid) Drive Range, First Gear Engine Braking (Gen 2/Hybrid). When the service brakes are applied and the vehicle speed, throttle position, and transmission temperature are within the calibration defined limits, the TCM commands Neutral Idle ON. The low and reverse clutch remains applied. The TCM reduces the pressure command to the 1234 PC Solenoid 5, which reduces the fluid pressure to the 1-2-3-4 clutch, allowing the clutch to slip. The resulting slip on the 1-2-3-4 clutch reduces the difference between the torque converter input speed and torque converter turbine speed, or torque converter clutch (TCC) slip speed. The reduced TCC slip speed reduces the engine load. This results in lower fuel consumption while Neutral Idle is commanded ON.