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d. Connect the pressure gauge "2" and fuel
pressure adapter "3" to the fuel hose.
Pressure gauge
90890-03153
Pressure gauge
YU-03153
Fuel pressure adapter
90890-03176
Fuel pressure adapter
YM-03176
3
2
e. Start the engine.
f. Measure the fuel line pressure.
Faulty → Replace the fuel pump.
Fuel line pressure (at idle)
300–390 kPa (3.0–3.9 kgf/cm²,
43.5–56.6 psi)
EAS31159
INSTALLING THE FUEL HOSE (FUEL RAIL
SIDE)
1. Connect:
• Fuel hose (fuel rail side)
ECA17500
NOTICE
When installing the fuel hose, make sure that
it is securely connected, and that the fuel
hose connector cover on the fuel hose is in
the correct position, otherwise the fuel hose
will not be properly installed.
TIP
• Install the fuel hose onto the fuel pump secure-
ly, and slide the fuel hose connector cover "1"
in the direction shown in the illustration.
• It is prohibited to wear the cotton work gloves
or equivalent coverings.
1
EAS30485
ADJUSTING THE THROTTLE POSITION
SENSOR
ECA17540
NOTICE
• Handle the throttle position sensor with
special care.
• Never subject the throttle position sensor
to strong shocks. If the throttle position
sensor is dropped, replace it.
1. Check:
• Throttle position sensor
Refer to "DIAGNOSTIC CODE: SENSOR
OPERATION TABLE" on page 9-77.
2. Adjust:
• Throttle position sensor angle
TIP
Before adjusting the throttle position sensor, the
throttle bodies must be removed.
a. Temporary tighten the throttle position sen-
sor screws "1".
b. Check that the throttle valves are fully
closed.
c. Connect the throttle position sensor to the
wire harness.
d. Remove the protective cap, and then con-
nect the YDT to coupler.
Yamaha diagnostic tool USB
90890-03267
Yamaha diagnostic tool (A/I)
90890-03264
TIP
• Yamaha diagnostic tool (A/I) (90890-03264) in-
cludes YDT sub harness (6P) (90890-03266).
• If you already have Yamaha diagnostic tool (A/
I) (90890-03262), YDT sub harness (6P)
(90890-03266) is separately required.
7-12
THROTTLE BODIES
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