Yamaha F225F, Service Manual

Page: 187 / 576

5-24
Engine control unit and component
0
1
2
3
4
5
6
7
8
9
10
A
8. Check the wiring harness for continuity.
9. Connect the engine ECM couplers
a
,
b
,
and
c
.
10. Connect the fuse holder coupler
d
, and
then install the fuse holder
a
.
11. Install the intake manifold (STBD). See
“Installing the intake manifold” (6-16).
Checking the ETV and TPS
TPS 1 and TPS 2 are components of the
ETV, which cannot be disassembled.
Do not loosen the throttle stop screw nut
or turn the throttle stop screw.
1. Connect the YDIS to display “Throttle
position sensor (main),” “Throttle valve
opening,” and “Throttle position sensor
(sub).”
2. Start the engine, warm it up for 5–10
minutes, and then stop it.
3. Turn the engine start switch to ON, and
then measure the TPS output voltages
and the throttle valve opening angles
when the Digital Electronic Control is at
the fully closed position.
TIP:
The actual TPS output voltage and throttle
valve opening angle may vary according to
environmental conditions and engine temper-
ature.
4. Turn the engine start switch to OFF.
5. Disconnect the ETV coupler
a
.
Wiring harness continuity:
Terminal 37–Terminal 10
Terminal 44–Terminal 23
Terminal 52–Terminal 22
d
a
22
10
23
37
44
52
c
d
TPS output voltage and throttle valve
opening angle (reference data):
Item Fully closed
TPS 1
0.37–0.63
V
TPS 2 2.5–3.5 V
Throttle valve opening angle 4.5°