The DDEC V ECU receives electronic inputs from sensors on the engine and vehicle, and uses the information to control engine operation. It computes fuel timing and fuel quantity based upon predetermined calibration tables in its memory. DDEC V provides an indication of engine and vehicle malfunctions. The ECU continually monitors the DDEC V system.… Read More »
The DDEC III/IV ECM receives electronic inputs from sensors on the engine and vehicle, and uses the information to control engine operation. Fuel is controlled by DDEC. See Figure 6. Portable equipment facilitates access to diagnostic capabilities of DDEC III/IV’s. The Diagnostic Data Reader (DDR) requests and receives engine data and diagnostic codes. This equipment… Read More »
The DDEC III/IV ECM receives electronic inputs from sensors on the engine and vehicle, and uses the information to control engine operation. It computes fuel timing and fuel quantity based upon predetermined calibration tables in its memory. Fuel is delivered to the cylinders by the EUIs, which are cam-driven to provide the mechanical input for… Read More »
DDEC II also controls the timing and amount of fuel injected into each cylinder. The system also monitors several engine sensors that send electrical signals to the main ECM. See Figure 4. Unlike DDEC I, the DDEC II ECM uses this information to actuate the EUI solenoids. DDEC II incorporates all of the control electronics… Read More »
DDEC I controls the timing and amount of fuel injected into each cylinder. The system also monitors several engine functions using various sensors that send electrical signals to the main Electronic Control Module (ECM). See Figure 3. The ECM uses this information to send a command pulse to the Electronic Distributor Unit (EDU). The EDU… Read More »
The Injection Control Pressure system provides the necessary energy to hydraulically actuate the HEUI injector. Engine oil is the hydraulic fluid used by this system for this purpose. Oil is drawn from the oil pan through the pick-up tube by the engine oil lubrication pump. The lubrication pump is a gerotor type pump driven by… Read More »
INTRODUCTION Detroit Diesel has released Detroit Diesel Electronic Control Unit (ECU) System. DETAILS AND REASON DDEC V provides an indication of engine and vehicle malfunctions. The Electronic Control Unit (ECU) continually monitors the DDEC V system. See Figure 1. Any faults that occur are stored as codes in the ECU’s memory. These codes can be… Read More »