Yamaha Waverunner VXS VX1800 Service Manual page 303

Diag-
nostic Item
code
136
137
ETV system
138
139
141 ETV system
142 ETV system
Symptom
Engine speed is limited
Engine speed is limited
Engine speed is limited
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 ECM circuit for con-
tinuity.
Check the ETV relay and fuse
(ETV relay) for continuity.
Check the TPS output voltage
and throttle valve opening us-
ing the YDIS.
Check the throttle shaft and
throttle inner surface for dam-
age and wear.
9-12
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
7-27
7-3
7-22
7-31
7-18
4-7