Yamaha MTN850-A 2017, Service Manual, Page: 345 / 560

THROTTLE BODIES
7-12
e. Start the engine.
f. Measure the fuel line pressure.
Faulty

Replace the fuel pump.
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EAS31159
INSTALLING THE FUEL HOSE (FUEL RAIL
SIDE)
1. Connect:
• Fuel hose (fuel rail side)
NOTICE
ECA17500
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 securely onto the fuel rail
joint until a distinct “click” is heard.
• To install the fuel hose onto the fuel rail joint,
slide the fuel hose connector cover “1” on the
end of the hose in the direction of the arrow
shown.
• It is prohibited to wear the cotton work gloves
or equivalent coverings.
EAS30485
ADJUSTING THE THROTTLE POSITION
SENSOR
NOTICE
ECA17540
• 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 “CHECKING THE THROTTLE PO-
SITION SENSOR” on page 8-170.
2. Adjust:
• Throttle position sensor angle
TIP
Before adjusting the throttle position sensor, the
throttle bodies must be removed.
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a. Temporary tighten the throttle position sensor
screws.
b. Check that the throttle valves are fully closed.
c. Connect the throttle position sensor to the
wire harness.
d. Remove the protective cap “1”, and then con-
nect the Yamaha diagnostic tool to coupler.
TIP
For information about using the Yamaha diag-
nostic tool, refer to the operation manual that is
included with the tool.
e. Diagnostic code number “01” is selected.
f. Adjust the position of the throttle position sen-
sor angle so that 11–21 can appear in the
Yamaha diagnostic tool screen.
g. After adjusting the throttle position sensor an-
gle, tighten the throttle position sensor
screws “2”.
Fuel line pressure (at idle)
300–390 kPa (3.0–3.9 kgf/cm²,
43.5–56.6 psi)
2
3
Throttle position sensor screw
3.5 N·m (0.35 kgf·m, 2.5 lb·ft)
1
T
R
.
.