2009 Yamaha F40 Outboard Service Manual, Page 44Get this manual
TECH FEA
Technical features and description
When oil pressure is too low Engine speed control starts when the oil pressure drops to below the specified value and the oil pressure switch remains on for more than the specified period of timeThe injection and ignition to the cylinder #3 is stopped firstIf the engine speed does not drop to the target speed, injection and ignition to the cylinders #3 and #2 will be also stoppedOnce the oil pressure switch is turned on and fully closed throttle is detected, the engine speed control ends and automatically shifts to the normal operating modeOil pressure switch Low oil pressure is detected and control starts Control starts Low oil pressure duration Cylinders to stop injection and ignition Max engine speed ON29.458.8 kPa (0.2940.588 kgfcm, 4.38.5 psi) Cooling water temperature is at 40C (104F) or higher Once engine speed exceeds 1100 rmin second #3, or #3, #2 around 3000 rmin