Suzuki 30-40HP outboard motors Service Manual, Page 13Get this manual
SERVICE MANUAL digital voltmeter as shown in FigSZl148Make sure battery voltage is nine volts or moreSensor output voltage at closed throttle should be 0.45-0.55 voltIf not, move position of sensor on carburetor to obtain specified voltage and securely tighten screws (7)Recheck voltage after tightening screws (7) and if necessary, remove cap (2) and turn adjustment screw to obtain 0.45-0.55 voltBe sure to reinstall cap (2)After obtaining the correct voltage at closed throttle, remove alignment pin and check sensor output voltage at wide-open throttleVoltage should be 2.7 volts or higherDo not attempt to adjust wideopen throttle voltageIDLE SPEED SWITClIIdle speed switch (8-FigSZ11-46) malfunction can be quickly verified by checking ignition timing and engine rpm while switching position of idle speed switchMake sure engine is at idle speed when checking timingNOTE: defective or maladjusted throttle valve sensor may cause Idle speed switch to be inoperative or Ignition timing at Idle speed to be incorrectPrior to testing Idle speed switch, make sure throttle valve sensor is operating properly and correctly adJustedRefer to THROTTLE VALVE SENSOR section