The Detroit Diesel Electronic Control (DDEC) system controls the timing and amount of fuel injected by the Electronic Unit Pump (EUP). The system also monitors several engine functions using electrical sensors which send electrical signals to the Electronic Control Module (ECM). The ECM then computes the incoming data and determines the correct fuel output and timing for optimum power, fuel economy, and emissions. The ECM also has the ability to display warnings or shut down the engine completely (depending on option selection) in the case of damaging engine conditions, such as low oil pressure, low coolant, or high oil temperature.
For complete information on component diagnosis, refer to Troubleshooting Manual , or call Detroit Diesel Technical Service (313) 592-7282.