Section 110-0030 Engine - Engine and Mounting 210-0000, COOLING SYSTEM. to control both the quantity of fuel injected and injection timing. There are two spin-on type fuel filters mounted on the left hand side of engine (1). Primary fuel filter (4) is in the fuel flow and acts as a strainer and secondary fuel filter (5) filters the fuel after having passed through primary fuel filter (4). The word 'Primary' or 'Secondary is cast into the top of the respective adaptor to prevent mismatching. 2. Programmable Read Only Memory (PROM) - Located in the ECM and encoded with the operating software. Additional information is programmed into the EEPROM.
This information controls the horsepower rating, torque curve, maximum engine speed and engine protection devices. The ECM processes this information and sends electronic signals to the Electronic Unit Injectors (EUI) where the precise amount of fuel is injected into the engine. DETROIT DIESEL ELECTRONIC CONTROL (DDEC) Description 3. Electronic Unit Injectors (EUI) - The EUI is a lightweight, compact unit that injects diesel fuel directly into the combustion chamber. The amount of fuel injected and the beginning of injection timing is determined by the ECM. The ECM sends a command pulse which activates the injector solenoid. Refer to Fig. 2.
WARNING Before any welding is done on a machine equipped with the DDEC system, disconnect the following in this order: Battery earth cable, battery supply cable, alternator earth cables, alternator supply cables, body hydraulics joystick, transmission (Est-37) connector, ECM interface harness connector (30 pin RHS), ECM sensor harness connector (30 pin LHS) and ECM engine to transmission datalink connector (6 pin RHS). Turn off battery master switch before disconnecting any components. The EUI performs four functions: a - Creates the high fuel pressure required for efficient injection. b - Meters and injects the exact amount of fuel required to handle the load.
c - Atomizes the fuel for mixing with the air in the combustion chamber. d - Permits continuous fuel flow for component cooling. Electronic unit injectors are self compensating and virtually eliminate engine tune-ups. After welding connect all of the above in the reverse order. Note: Never apply 12 V directly to terminals on the injector or engine sensors as they will burn out. Before removing injectors, the fuel passages must be blown out to prevent fuel flow from entering the cylinder head. The engine is equipped with DDEC which controls the timing and amount of fuel injection by the electronic unit injectors (EUI).
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. 4. Batteries - Two 12 volt maintenance free batteries supply the machine with electrical power to operate all electrical components. 5. Electronic Foot Pedal - The electronic foot pedal provides an electrical signal to the engine's fuel control system in proportion to the degree of pedal actuation.
The DDEC system also takes action to prevent damage to the engine and, provides the serviceman with diagnostic capabilities so that problems can be corrected quickly and easily. Note: The DDEC controlled engine will override the electronic foot pedal position until the engine is warmed up to the correct operating temperature. The engine MUST be started with foot 'OFF' the electronic foot pedal. 1. Electronic Control Module (ECM) - Receives electronic inputs from the driver as well as from mounted sensors that provide information electronically, such as oil pressure and temperature and intake manifold pressure. This information is used 6.
Check Engine Light - When the 'Check Engine' light comes on, the computer has detected a fault in the SM 2121 Rev 1 11-03 2