How to use the M+ and M- in automatic transmission?
3 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.
As a seasoned driver who has been driving automatics for years, the manual mode M+ and M- are my trusty tools. Before climbing steep slopes, I press M- to downshift to lower gears like 2nd or 3rd, significantly increasing engine torque for effortless uphill driving. On long descents, downshifting utilizes engine braking to control speed, reducing brake pad wear and heat for enhanced safety. When overtaking, instant downshifting delivers exhilarating acceleration with that satisfying push-back sensation. Avoid overuse—exceeding redline RPMs harms the engine, and prolonged gear dragging risks malfunctions. For daily city driving, D mode offers comfort, but switch to manual in complex terrain for better control. Exercise caution with manual mode during rain/snow to prevent skidding. Regular maintenance, including transmission fluid pressure checks, ensures system health—don’t neglect it. Cultivate these habits for peace of mind and extended vehicle lifespan. While not mandatory, manual mode can be lifesaving in critical moments. Experience teaches you to switch flexibly based on road conditions.
