How to use the M+ and M- in automatic transmission?
2 Answers
Usage methods of M+ and M- in automatic transmission: 1. Highway driving: On highways, drivers can manually shift to higher gears using M+ to maintain speeds between 80-100km/h; 2. Icy/snowy roads: Adjust to gear 2 using M+ to reduce wheel slippage; 3. Overtaking: Use M- to downshift, providing higher torque for instant acceleration; 4. Uphill driving: Employ M- on slopes as lower gears deliver stronger engine power. Automatic transmission refers to a vehicle's gear-shifting mechanism where the transmission control system automatically selects appropriate gears based on engine speed and load, replacing manual gear-shifting decisions.
As a beginner with automatic transmissions, it took me some time to figure out using the M+ and M- manual modes. Simply put, while driving, shift the gear lever to the M position or press the button to switch to manual mode, then tap the plus sign M+ to upshift for acceleration, and the minus sign M- to downshift for deceleration or increased power. Starting off in D mode is more worry-free, but downshifting before a long downhill helps utilize engine braking to maintain speed and prevent brake overheating, while downshifting before a steep climb increases torque for easier ascent. Downshifting momentarily during overtaking raises the RPM for quick response. Be careful not to keep the RPM too high or too low for extended periods, as it can damage the engine—practice switching gears on empty roads to get a feel for it. Safety first, don’t rush, and use caution in rain or slippery conditions. Read the manual to understand gear limitations, as designs vary greatly between cars. This method gives more control, especially for hill starts or snowy conditions to prevent wheel spin. Daily driving in D mode is sufficient, but manual mode is a big help in special road conditions.
