What is EDC15?
Bosch EDC15 is a family of electronic diesel engine management systems. The ECU reads the driver request and engine operating conditions, then controls how much fuel is delivered and when. Its functions can also include air and boost control, starting, idle, diagnostics and interventions from other vehicle systems, depending on the application.
Injection quantity or torque?
EDC15 is generally best understood as injection-quantity-oriented: requests, corrections and limits commonly act on a fuel quantity. Bosch identifies the later torque-coordinated EDC architecture as introduced with EDC16. This is a description of the control approach, not a claim that EDC15 has no torque calculations or torque-related interventions. For example, Bosch lists external torque intervention for its EDC15 examples, and the 2001 Saab EDC15/VP44 system calculates permitted fuel in mg per combustion.
Family scope
EDC15 is used with several kinds of diesel injection hardware. Bosch documents EDC15V with a distributor pump, EDC15M with VP30/VP44 distributor pumps, EDC15P with unit injectors, and EDC15C in a common-rail system. Their metering, timing and pressure controls differ; identify the exact engine, ECU and software before applying a definition or tuning advice.
Continue with EDC15 fuel control and tuning basics for the request-to-fuel flow, common limits, hardware differences and a practical starting point. Compare Bosch EDC16 for the later torque-oriented approach.
Sources
Curated reference notes. Applicability follows the cited sources; hardware testing by this wiki is not implied.
- Bosch Electronic Diesel Control (EDC). Robert Bosch GmbH; independent PDF mirror. EDC15V, EDC15M, EDC15C and EDC15P examples and general EDC control principles. Source revision 2001, printed pages 15–18, 48–54 and 75–77; accessed 2026-11-10.
- Saab 9-3 Workshop Information System: EDC 15 (D223L), brief description. Saab Workshop Information System, 2001 Saab 9-3 D223L; independent online reproduction. EDC15 with VP44 pump, not all EDC15 applications. Source revision 2001 9-3, engine, EDC 15 technical description; accessed 2026-11-10.
- Volkswagen Self-Study Programme 304: Electronic Diesel Control EDC 16. Volkswagen AG, Service Training; independent PDF mirror. EDC16 description uses the V10 TDI unit-injector system, with R5 differences. Source revision SSP 304, especially printed pages 4, 8–10 and 15; accessed 2026-11-10.