1996-2005 Suzuki DF40, DF50 Four Stroke Outboard Service Manual, Page 94Get this manual
3-39 ENGINE CONTROL SYSTEM MAP SENSOR OUTPUT VOLTAGE CHANGE 09917-47011Vaccum pump gauge 09930-8994012-pin test cord 09930-99320Digital tester Tester range(DC voltage)
(1) Disconnect MAP sensor hose from gas filter (surge tank) side(2) Connect the gauge to MAP sensor hose end as shown(3) While applying negative pressure to MAP sensor, measure "D7" terminal voltage(See page 3-33 and 3-34 for procedure MAP sensor output voltage change :