Electrical System - Yamaha F150A Service Manual

Electrical component and wiring harness routing ......... 5-1
Port ........................................................................................... 5-1
Junction box assembly .............................................................. 5-3
Rear ........................................................................................... 5-5
Top ............................................................................................ 5-6
Bottom cowling .......................................................................... 5-7
ECM circuit ........................................................................ 5-9
Circuit diagram .......................................................................... 5-9
ECM coupler layout ................................................................. 5-11
Checking the electrical component ............................... 5-12
Using the YDIS ........................................................................ 5-12
Measuring the peak voltage .................................................... 5-12
Using the digital tester ............................................................. 5-13
Engine control unit and component .............................. 5-13
Checking the main relay .......................................................... 5-13
Checking the engine ECM circuit ............................................ 5-14
Checking the TPS ................................................................... 5-15
Checking the ISC valve ........................................................... 5-15
Checking the oil pressure sensor ............................................ 5-16
Fuel control unit and component .................................. 5-16
Checking the water detection switch ....................................... 5-16
Checking the fuel injector ........................................................ 5-17
Checking the high-pressure fuel pump .................................... 5-18
Checking the vapor shut-off valve ........................................... 5-18
Charging unit and component ....................................... 5-19
Checking the lighting coil (stator assembly) ............................ 5-19
Checking the Rectifier Regulator ............................................. 5-19
Ignition unit and component .......................................... 5-21
Checking the ignition spark ..................................................... 5-21
Checking the spark plug wire .................................................. 5-21
Checking the ignition coil ......................................................... 5-21
Checking the pulser coil .......................................................... 5-22
Checking the air temperature sensor ...................................... 5-23
Checking the air pressure sensor ............................................ 5-24
Checking the engine temperature sensor ............................... 5-24

Electrical system

5