BMW E81 E87 LCI E90 118d 318d N47 Diesel ECU KIT DDE 7811701 CAS3 + Key Manual

BMW E81 E87 LCI E90 118d 318d Engine Control Unit is an original part from the Electronic Control Modules and Controllers category, designed for precise management of the powertrain. The ECU controller works with a diesel engine and a manual gearbox, ensuring stable operating parameters and correct communication with other BMW vehicle systems.

Specifications and technical data

• SKU: 7811701-3
• Mark: BMW (Genuine OE)
• Condition: Used
• OEM Part Number: 7811701
• Substitutable numbers: 13617809001, 7809001, 0281015042, 61359147220, 9147220, 13618506281, 8506281, 13617812501136178100011361781170113617807143, 7812501781000178117017807143, 13617807204136178120011361780782813617807529, 7807204781200178078287807529, 1361850, 22316872019, 6872019, 22316772031, 6772031
• Fuel type: Diesel
• Gearbox type: Manual
• ECU type: Engine Control Unit
• Category: ECUs & Computer Modules

Purpose and Function of the BMW Engine Controller

The engine control unit in BMW 1 and 3 Series models is responsible for precise control of fuel injection, boost pressure, and engine protection systems. In vehicles with diesel engines and manual transmissions, the ECU monitors, among other things, fuel dosage, system pressure, auxiliary equipment operation, and interaction with safety and comfort systems.

As an Engine Control Unit, this module is the central element of electronic powertrain management – it collects signals from sensors, processes them according to stored maps, and sends appropriate commands to actuators. A correctly selected controller allows for maintaining factory performance, smooth operation, and fuel consumption in line with the manufacturer's specifications.

Compatibility, Interchangeable Numbers, and OEM Selection

The presented controller belongs to the group of BMW Electronic Control Modules and Controllers, for which dedicated OEM part numbers and an extensive list of interchangeable numbers are available. This allows for matching the ECU to a specific engine and equipment version of the vehicle, taking into account the fuel type, gearbox type, and software version.

When selecting a controller, it is advisable to base your choice on:

• the OEM part number assigned to the module,
• reference (interchangeable) numbers used in manufacturer and supplier catalogs,
• the exact designation of the BMW model and year,
• the Diesel engine type and manual gearbox configuration.

This approach minimizes the risk of hardware or software incompatibility and facilitates the subsequent adaptation of the controller in the vehicle.

Benefits of Using an Original ECU Module

Choosing an original BMW engine control unit offers a number of practical advantages:

• Factory Integration with Vehicle Wiring – connectors, pinout, and communication protocols are compatible with the electrical system of the specific model.
• Appropriate operating maps for diesel engines – the ECU is prepared to handle the specific parameters of a diesel engine, including operation under load and in low temperatures.
• Compatibility with manual gearbox – the controller takes into account the drivetrain characteristics and the logic of driver assistance systems.
• Adaptation and coding capability – the module can be matched to a specific car instance using appropriate diagnostic tools.

This allows the controller to restore proper engine operation in case of a previous module failure or communication problems within the vehicle network.

Condition, Verification, and Practical Application

The module comes from a BMW vehicle and is offered as a used part, allowing for economical restoration of the engine control system's functionality while maintaining original specifications. This type of solution is particularly beneficial for vehicles that are several or over ten years old, where the cost of a new ECU can be disproportionately high compared to the vehicle's value.

Before installation, it is recommended to:

• verify compatibility by OEM number and interchangeable numbers,
• check the fuel type and gearbox in the vehicle,
• plan for potential programming, coding, or immobilizer data cloning.

This approach ensures seamless integration of the module with the existing vehicle wiring and electronics.

More About BMW Electronic Control Modules and Used Electronics

If you are looking for other BMW Electronic Control Modules and Controllers, check out our dedicated category: BMW Electronic Control Modules and Controllers. There you will find a wide selection of ECUs and other modules tailored for various models of this brand.

When planning to purchase a used engine controller, it is worth familiarizing yourself with the principles of selection by OEM number, hardware and software compatibility, and proper installation. We describe this in detail in the guide: Used Automotive Electronics – Why Second-Hand ECU Modules Are a Sensible Choice. Additionally, the article discusses the cost-effectiveness of original, aftermarket, and used components: Original, Aftermarket, or Used – Which Car Parts Are Most Cost-Effective.