Description & Operation: Introduction

The 4T40-E is a fully automatic front wheel drive electronically controlled transaxle. The 4T40-E provides four forward gear ranges, including overdrive and one reverse gear range. The Powertrain Control Module (PCM) controls shift points by means of two shift solenoids. A vane type pump supplies the oil pressure. The PCM regulates oil pressure by means of the Pressure Control (PC) solenoid.

The transaxle can be operated in any one of the following seven modes:

• P - Park position prevents the vehicle from rolling either forward or backward. For safety reasons, use the parking brake in addition to the Park position.
• R - Reverse allows the vehicle to be operated in a rearward direction.
• N - Neutral allows the engine to be started and operated while driving the vehicle. If necessary, you may select this position to restart the engine with the vehicle moving.
• D - Overdrive is used for all normal driving conditions. Overdrive provides four gear ranges plus a converter clutch operation. Depress the accelerator to downshift for safe passing.
• 3 - Drive position is used for city traffic and hilly terrain. Drive range provides three gear ranges, and prevents the transaxle from operating in 4th gear. Depress the accelerator to downshift.
• 2 - Manual 2nd provides two gear ranges under most operating conditions. Manual 2nd provides acceleration and engine braking. Select this range at any vehicle speed, but the transaxle will not downshift into 2nd gear until the vehicle speed drops below approximately 62 MPH.
• 1 - Manual Low provides maximum engine braking. Select this range at any vehicle speed, but the transaxle will not downshift into 1st gear until the vehicle speed drops below approximately 37 MPH.