ECD Pump

Measures are increasingly being taken on a global scale to make vehicles more environmentally friendly. As a result, electronic control is being added to conventional mechanical fuel injection pumps to reduce the exhaust gases and noise from diesel vehicles.

ECD Pump

How DENSO ECD pumps work

Rotary distributor-based diesel fuel injection pumps were an industry standard for years; however, as emissions standards for new vehicles became stricter, their mechanical control systems could no longer deliver the precision control over fuel injection that was required.

The electronically controlled diesel (ECD) pump was a result of these increased demands. It electrified the distributor pump system, introducing various sensors, an electronic control unit (ECU) and an actuator. Various sensors detect running conditions and send this information to the ECU, which controls the actuator to constantly adjust fuel injection quantity and timing, depending on the state of the engine. When a certain volume or injection timing would be optimal for combustion, an ECD pump can adjust the fuel supply and timing to match this demand.

Fuel is still being pumped, via mechanical injectors, directly into each cylinder – but electrifying the process through ECD pumps means a diesel engine can achieve higher levels of performance and efficiency, allowing it to meet stricter emissions regulations.

ECD V4 type diesel pump

Features and benefits

  • More intelligent than the traditional mechanical systems
  • Supports improved accuracy of fuel injection, greater efficiency and lower carbon emissions
  • The product of 30 years of DENSO innovation
Fully electronic
In an ECD system, the engine ECU comprehensively calculates the engine and driving conditions, and correspondingly controls aspects such as the fuel injection amount and fuel injection timing to produce the optimum conditions.
High performance
The fuel injection system (fuel pump, nozzles, etc.) has a major impact on engine and vehicle performance, helping meet the various higher requirements placed on diesel cars, which necessitate high injection pressures, optimum injection ratios, fine injection timing control, highly accurate injection control, and other measures. An electronically controlled ECD-V system based on a conventional distributor-type pump (VE pump) enables this level of high performance.

Types and characteristics

There are several types of ECD pumps available, all manufactured to deliver high, reliable performance. The ECD systems developed are the ECD-V series (V3, V4, V5), which are electronic versions of the VE distributor-type pumps.

ECD Pump types


The V1 is the first of the ECD-V series, which appeared in 1982. This pump type was the bases for all the other ECD-V types, however never introduced into South Africa.


The V3, a swirl-chamber type diesel injection system, appeared in 1985. It adopted a solenoid spill valve to control fuel injection, enabling control of injection volume on a cylinder-by-cylinder basis.

Depending on the type of final injection volume correction and the solenoid spill valve used, three types of ECD-V3 are available: ECD-V3, ECD-V3 (ROM), and ECD-V3 direct-acting valve.


This pump, used in the V4 direct-injection diesel fuel injection system for small trucks and SUVs, appeared in 1998.

The V4 system, which uses an inner cam pumping mechanism, enables high-pressure injection at 1,300 bars.


This pump is used in the V5 direct-injection diesel fuel injection system for passenger vehicles. It appeared at about the same time as the V4 pump. The V5 system uses pilot injection to reduce the combustion noise of the engine.


Our ECD pump (Electronic Controlled Diesel) is used in the ECD-system, wherein the engine ECU comprehensively calculates the engine and driving conditions, and correspondingly controls aspects such as fuel injection amount and fuel injection timing to produce the optimum conditions and help meet regulations.