Steering Sensor Check; Ecm Check - Yamaha Waverunner VXS VX1800 Service Manual

Steering sensor check

1. Connect the YDIS to display "Steering
sensor."
2. Check that the following is displayed in the
"Engine monitor" window of the YDIS
when the handlebar is in each position.
Measure the steering sensor input voltage
if out of specification.
Steering sensor operation
Handlebar position
Straight ahead
Turn to the left and
right
3. Disconnect the steering sensor coupler
"a".
4. Supply power to the ECM, and then mea-
sure the input voltage at the steering sen-
sor coupler terminals (wire harness end).
Check the steering sensor output voltage if
within specification. Check the wire har-
ness if out of specification.
a
Input voltage
4.75–5.25 V
Orange/Red (O/R)–Black/Orange (B/O)
YDIS display
OFF
ON
B/O O/R
5. Connect the special service tool "1" to the
steering sensor coupler.
6. Supply power to the ECM, and then mea-
sure the output voltage when the handle-
bar is in each position.
Throttle sensor adjusting lead FWY–3 "1"
90890-06857
Test harness (3 pins) "1"
YB-06857
Steering sensor output voltage
Handlebar position
Straight ahead
Turn to the left and
right
7. Disconnect the special service tool, and
then connect the steering sensor coupler.

ECM check

1. Disconnect the ECM coupler "a".
2. Supply power to the ECM, and then mea-
sure the input voltage between the ECM
coupler terminal (wire harness end) and
ground. Check the ECM circuit for continu-
ity if out of specification.
TIP:
Do not disconnect the coupler "b" or coupler "c"
when measuring the ECM input voltage.
7-27
Control system
1
R
P
O
V
4.5
1.8