1998 Johnson Evinrude "EC" 150, 175 FFI Service Manual, P/N 520211, Page 51Get this manual
Oil Injector
The oil injector is 26-volt solenoid similar in design and function to fuel injectorIt receives oil from the oil pump, and injects it at approximately 40 PSI (275,8 kPa) into the oil distribution manifoldEach injector has an internal oil passage designed for coolingIt never closes, and passes through the body to link the inlet and outlet nipplesSince oil arrives under pressure, small volume constantly flows through the injector to cool the coil and armature before returning to the boat oil tankOil injector operation is variable and controlled by the ECUIts operation is relative to throttle position and engine RPM, and is designed to function with any TC-W3oilThe ECU can detect an injector open circuit, and in such cases will store service code, turn on the System Check "NO OIL" light, and initiate S.L.oWA fuse in the Power Distribution Panel (position 1) protects the oil injector circuitPressure Regulator The pressure regulator is located in the oil return lineThe regulator maintains approximately 6-20 PSI (41-138 kPa), and allows oil to return to the boat's oil tank