2004 Nissan Sentra Owner's Manual - Page 130

If the shift selector lever cannot be moved out of P (Park), have a NISSAN dealer check the automatic transmission system as soon as possible. OFF: Accelerator downshift - in D position - For passing or hill climbing, depress the accelerator pedal to the floor. This shifts the transmission down into a lower gear, depending on the vehicle speed. For driving up and down long slopes where engine braking is necessary push the Overdrive switch once. The O/D OFF indicator light in the instrument panel comes on at this time. WSD0045 When cruising at a low speed or climbing a gentle slope, you may feel uncomfortable shift shocks as the transmission shifts into and out of Overdrive repeatedly. In this case, depress the Overdrive switch to turn the Overdrive off. The O/D OFF indicator light in the instrument panel comes on at this time. When driving conditions change, depress the Overdrive switch to turn the Overdrive on. Remember not to drive at high speeds for extended periods of time with the Overdrive off. This reduces fuel economy. Overdrive switch Each time your vehicle is started, the transmission is automatically "reset" to overdrive ON. ON: With the engine running and the shift selector lever in the D (Drive) position, the transmission upshifts into Overdrive as vehicle speed increases. MANUAL TRANSMISSION WARNING ● Do not downshift abruptly on slippery roads. This may cause a loss of control. ● Do not over-rev the engine when shifting to a lower gear. This may cause a loss of control or engine damage. Overdrive does not engage until the engine has reached operating temperature. 5-10 Starting and driving