**RENAULT AL4-DPO Transmission**
The RENAULT AL4-DPO transmission is a four-speed automatic transmission that was first introduced in 1999. It is a transversely mounted, front-wheel-drive transmission that is used in a variety of Renault and Nissan vehicles. The AL4-DPO transmission is known for its smooth shifting and fuel efficiency.
**Technical Specifications**
* **Type:** Four-speed automatic transmission
* **Mounting:** Transverse
* **Drive:** Front-wheel drive
* **Gear ratios:**
* First gear: 3.727:1
* Second gear: 2.086:1
* Third gear: 1.364:1
* Fourth gear: 1.000:1
* Reverse gear: 3.418:1
* **Final drive ratio:** 3.89:1
* **Weight:** 65 kg (143 lb)
**Features**
* **Electronic control unit (ECU):** The AL4-DPO transmission is controlled by an ECU that monitors a variety of inputs, including engine speed, vehicle speed, and throttle position. The ECU uses this information to determine the appropriate gear ratio and shift points.
* **Adaptive shift logic:** The AL4-DPO transmission uses adaptive shift logic to learn the driver's driving style and adjust the shift points accordingly. This helps to optimize the transmission's performance and fuel efficiency.
* **Lock-up torque converter:** The AL4-DPO transmission is equipped with a lock-up torque converter. This helps to improve fuel efficiency by reducing slippage between the engine and transmission.
* **Overdrive gear:** The AL4-DPO transmission has an overdrive gear that is used to reduce engine speed at cruising speeds. This helps to improve fuel efficiency and reduce noise.
**Applications**
The RENAULT AL4-DPO transmission is used in a variety of Renault and Nissan vehicles, including:
* Renault Clio
* Renault Mégane
* Renault Scénic
* Renault Laguna
* Nissan Micra
* Nissan Almera
* Nissan Primera
**Reliability**
The RENAULT AL4-DPO transmission is generally considered to be a reliable transmission. However, some early models experienced problems with the valve body and torque converter. These problems have been largely resolved in later models.
**Maintenance**
The RENAULT AL4-DPO transmission requires regular maintenance, including:
* Fluid changes: The transmission fluid should be changed every 30,000 miles (48,000 km).
* Filter changes: The transmission filter should be changed every 60,000 miles (96,000 km).
* Band adjustments: The transmission bands should be adjusted every 120,000 miles (192,000 km).
By following these maintenance guidelines, you can help to extend the life of your RENAULT AL4-DPO transmission.
AL4-DPO-transmission master workshop service manual
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