Yamaha Waverunner VXS VX1800 Service Manual page 304

Diag-
nostic Item
code
143
ETV system
144
145 ETV system
150
151
RPS
152
153
154 RPS
157 SCU
158 SCU
Symptom
Engine speed is limited
Engine speed is limited
Engine speed is limited
Shifting is impossible
Engine speed is limited
Shifting is impossible
Engine speed is limited
Shifting is impossible
Changing the trim angle is im-
possible
Checking steps
Check the ECM circuit for con-
tinuity.
Check the ETV relay for conti-
nuity.
Check the charging system.
• Stator coil output peak volt-
age
• Stator coil resistance
• Rectifier/regulator output
peak voltage
• Rectifier/regulator continuity
Check the fuse for continuity.
Check the battery voltage and
specific gravity.
Check the red (R) and black
(B) power supply circuit cables
and leads for continuity.
Check the ETV relay and fuse
(ETV relay) for continuity.
Check the throttle shaft and
throttle inner surface for wear
or damage.
Check the orange/red (O/R),
orange/white (O/W), pink/red
(P/R), pink/white (P/W),
black/red (B/R), and
black/white (B/W) RPS leads
for continuity.
Check the ECM circuit for con-
tinuity.
Check the RPS output volt-
age using the YDIS.
Check the ECM circuit for con-
tinuity.
Replace the RiDE motor.
Check the electric trim switch
operation using the YDIS.
Measure the electric trim
switch resistance.
9-13
Engine unit troubleshooting
See
page
7-27
7-22
7-13
7-13
7-13
7-13
7-3
7-31
3-6
A-2
7-3
7-22
7-31
4-7
A-2
7-27
7-23
7-27
8-26
7-25
7-25