These engines are equipped with a high pressure fuel system. The fuel injection pump and the fuel lines deliver fuel to an electronic unit injector in each cylinder. A solenoid on each injector meters the amount of fuel that is delivered by the injector. An Engine Control Module (ECM) sends signals to two pressurizing assemblies on the pump and to the injector solenoids in order to control the injection of fuel.
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Contact with high pressure fuel may cause fluid penetration and burn hazards. High pressure fuel spray may cause a fire hazard. Failure to follow these inspection, maintenance and service instructions may cause personal injury or death. |
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Do not loosen any high pressure fuel lines when the engine is running. The high pressure in the fuel lines can cause personal injury or death. Wait 60 seconds after the engine has stopped to allow pressure to purge before any service or repair is performed on the engine fuel lines. |
The electronic control system includes the ECM, the engine sensors, and the machine interface. The ECM is a computer that controls the operation of the engine. The flash file is the software for this computer. The flash file contains the operating maps. The operating maps define the following characteristics of the engine:
- Horsepower
- Torque curves
- Engine speed (rpm)
Refer to Troubleshooting, "System Overview" for additional information on the electronic control system.
The ECM interfaces with the machine via software and an electrical connector on the ECM. The software can be configured.
The machine provides inputs to the electrical connector on the ECM in order to indicate the status of switches. The ECM must be correctly configured in order to interpret the inputs.
The ECM provides outputs for the machine via the electrical connector in order to control lamps, solenoids, and other devices. The ECM must be correctly configured in order for the outputs to match the machine's configuration.
As a reference, simplified schematics for each of the engine's subsystems are included with each of the circuit tests that are in this manual. For an accurate representation of the entire electrical schematic that is for your application, refer to the Electrical System Schematic.
During troubleshooting, inspect all harness connections before any component is replaced. If these connections are not clean and tight, continuous electrical problems or intermittent electrical problems can result. Check that the wires are pushed into the connectors completely. Make sure that the connections are tight before other tests are made.
Failure of an electrical component may cause the failure of other components. Always attempt to correct the cause of an electrical failure before you replace a component. If wire insulation is punctured, repair the damage. Seal the damaged wires with 8T-0065 Silicone Sealant. Cover the sealant with two layers of 1P-0810 Electrical Tape.