2001 Edition Yamaha F225A and LF225A Outboards Service Manual, Page 112Get this manual
Power unit
Oil pressure sensor input voltage: Pinkwhite (PW) Black (B) 5V Oil pressure sensor output voltage (reference data): Orange (O) Black (B) 3.8 at idle speed (700 rmin)
5Check the oil pressureCheck the oil pump, oil leakage, and oil strainer if out of specificationOil pressure (reference data): 650 kPa (6.5 kgfcm2, 92.4 psi) at idle speed (700 rmin)
Checking the oil pressure sensor
1Connect the test harness (3 pins) to the oil pressure sensor2Start the engine and warm it up for minutes3Measure the oil pressure sensor input voltageCheck the wiring harness connection or replace the ECM if out of specification4Measure the oil pressure sensor output voltageReplace if out of specificationPW O