Ydis; Function - Yamaha Waverunner VXS VX1800 Service Manual

Function

1. Diagnosis: Each sensor's status and each ECM diagnostic code or item is displayed. This enables
you to find malfunctioning parts and controls quickly. The diagnostic codes displayed are the same
as those described in "Diagnostic code and checking step" in this chapter.
2. Diagnosis record: Sensors that had been activated and ECM diagnostic codes that have been
recorded are displayed. This allows you to check the watercraft's record of malfunctions. The diag-
nostic codes displayed are the same as those described in "Diagnostic code and checking step" in
this chapter.
3. Engine monitor: Each sensor status and the ECM data are displayed. This enables you to find
malfunctioning parts quickly. In addition, the data displayed using the Engine monitor function can
be displayed in a graph.
Engine speed
Intake air pressure
TPS 1
Throttle valve opening angle
TPS 2
APS 1
APS 2
RPS main*1
RPS sub*2
Atmospheric pressure
Ignition timing
*1. RPS 1
*2. RPS 2
*3. Thermo sensor
4. Stationary test: Operation tests can be performed with the engine off.
Activate ignition coil (#1–#4)
*1. Operate fuel pump module
5. Active test: With the engine running, the ignition for each cylinder is dropped and the engine speed
is checked for changes to determine if the cylinder is malfunctioning. These tests can be performed
quickly.
6. Logger graph: Data stored in the ECM for the last 78 seconds (in 6-second intervals) is displayed
on a graph.
Engine speed
Battery voltage
7. ECM record graph: When a malfunction occurs in the ETV system or APS system, 4 seconds (2
seconds before and after the malfunction) of recorded data is saved in the ECM. This data can be
displayed on a graph using the "ECM record data graph" of the Data logger function.
Battery voltage
Fuel injection duration
Engine temperature
Intake air temperature
Ex. manifold water tempera-
ture*3
Thermoswitch
Slant detection switch
Oil pressure switch
Engine start switch
APS full close switch
Steering sensor
Activate injector (#1–#4)
TPS
Engine temperature
9-2
No-wake mode switch
Cruise assist set switch
Cruise assist up switch
Cruise assist down switch
Trim up switch
Trim down switch
Main relay
ETV relay
Fuel pump relay
Shift position angle
Activate electric fuel pump*1
Intake air pressure
Oil pressure switch

YDIS