Yamaha WaveRunner VXR VX1800A, Service Manual

Page: 206 / 318

Electrical system
Electrical components ....................................................... 7-1
Engine ........................................................................................ 7-1
Deck and hull.............................................................................. 7-2
Electrical box .............................................................................. 7-3
ECM circuit diagram ................................................................... 7-4
ECM coupler layout .................................................................... 7-7
Electrical analysis .............................................................. 7-9
Electrical component check using the YDIS............................... 7-9
Power supply to the ECM........................................................... 7-9
Peak voltage measurement........................................................ 7-9
Test lead preparation ............................................................... 7-10
Ignition system ................................................................. 7-11
Ignition spark check.................................................................. 7-11
Ignition coil check ..................................................................... 7-11
Pickup coil check...................................................................... 7-12
Charging system .............................................................. 7-13
Stator coil check ....................................................................... 7-13
Rectifier/regulator check........................................................... 7-13
Control system ................................................................. 7-15
Oil pressure switch check......................................................... 7-15
Thermo switch check................................................................ 7-15
Thermo sensor check............................................................... 7-16
Engine temperature sensor check............................................ 7-16
Intake air temperature sensor check ........................................ 7-17
Intake air pressure sensor check ............................................. 7-18
TPS check ................................................................................ 7-18
ETV circuit continuity................................................................ 7-20
APS check................................................................................ 7-20
APS circuit continuity................................................................ 7-21
ETV relay check ....................................................................... 7-22
RPS check................................................................................ 7-23
RPS circuit continuity ............................................................... 7-23
SCU relay check....................................................................... 7-24
Electric trim switch check ......................................................... 7-25
Cam position sensor check ...................................................... 7-25
Slant detection switch check .................................................... 7-26
Steering sensor check.............................................................. 7-27
ECM check ............................................................................... 7-27
Earth plate check...................................................................... 7-28