FITTING-ELBOW 1560995 - Caterpillar

2. Loosen two socket head bolts fastening electronic wiring harness connectors (2) to engine electronic control group (1).3. Disconnect electronic wiring harness connectors (2) from engine electronic control group (1).
The fuel in the engine electronic control module and in the hose assemblies connected to the module may be under high pressure. When the hose assemblies connected to the module are disconnected, the pressure will be released. Fuel under high pressure can penetrate the body causing personal injury. To release the pressure, slowly loosen the hose assemblies from the module.
4. Disconnect two fuel lines (3). Cap and plug the fuel lines immediately. 5. Remove four bolts (4), the bushings, washers and spacers fastening engine electronic control group (1) to the valve cover. Remove engine electronic control group. The following steps are for the installation of the original engine electronic control module that was removed in Steps 1 through 4. If a new engine electronic control module is to be installed, refer to the topic "Replacing The Electronic Control Module with a New ECM" in the 3408E & 3412E Engine Troubleshooting Module, SENR1060.6. To install the engine electronic control group, reverse the removal steps.