The engine-mounted ECM includes control logic to provide overall engine management. The ECM continuously performs self diagnostic checks and monitors other system components. System diagnostic checks are made at ignition-on and continue throughout all engine operating modes. See Figure 3-1. The ECM contains an Electronically Erasable Programmable Read Only Memory (EEPROM). The EEPROM controls the… Read More »
The Engine Interface Harness used in multi-ECM applications is usually installed at the factory and delivered connected to all ECMs. The factory-installed Engine Interface Harness, see Figure 2-6, normally terminates with a quick disconnect connector. The OEM Vehicle Interface Harness connects to the quick disconnect connector, see Figure 2-7, and see Figure 2-8. Refer to… Read More »
Multi-ECM engines operate with more than one ECM. The controlling ECM is referred to as the Master ECM, while one Receiver is referred to as the first receiver and the other, if required, is the second receiver. An engine sensor harness for multi-ECM engines is a wiring harness that connects the various sensors on the… Read More »
A DDEC Electronic Unit Pump (EUP) is a type of fuel injection pump that is used in Detroit Diesel engines. It is a combination of a mechanical pump and an electronic control system. The mechanical pump generates the high pressure needed to inject fuel into the engine’s cylinders, and the electronic control system controls the… Read More »
DDEC Common Rail Electronics (CRE) is the electronic control system for common rail fuel injection systems in Detroit Diesel engines. It is responsible for controlling the fuel injection timing and quantity, as well as other aspects of engine operation, such as idle speed and turbocharger boost. The Series 4000 common rail fuel injection system relies… Read More »
DDEC Electronic Unit Injectors (EUIs) are a type of fuel injector that is used in Detroit Diesel engines. They are electronically controlled and can adjust the timing and quantity of fuel injected with great precision. This helps to improve fuel economy, reduce emissions, and extend engine life. The Electronic Unit Injector (EUI), see Figure 2-2,… Read More »
A DDEC injector harness is a wiring harness that connects the electronic unit injectors (EUIs) to the electronic control module (ECM) in a Detroit Diesel engine. It is a critical component of the DDEC system, as it allows the ECM to control the timing and quantity of fuel injected into the engine’s cylinders. The injector… Read More »
The Detroit Diesel Electronic Control (DDEC) system is a microprocessor-controlled electronic unit injection-engine governing system. It was first introduced in 1985 and has since gone through several generations of development. The DDEC system is used to control and monitor all aspects of engine operation, including fuel injection, timing, air intake, and emissions. The major components… Read More »