Yamaha F150A, Service Manual

Page: 146 / 493

5-15
Engine control unit and component
5. Turn the engine start switch to OFF.
6. Connect the engine ECM coupler.
Checking the TPS
1. Connect the YDIS to display “TPS”.
2. Start the engine and 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 voltage
and throttle valve opening angles when
the remote control lever is at the fully
closed position “a” and fully open position
“b”.
4. Disconnect the TPS coupler “a”, and then
measure the TPS input voltage at the
TPS coupler.
5. Turn the engine start switch to OFF.
6. Connect the TPS coupler.
Checking the ISC valve
1. Check the operation of the ISC valve
using the YDIS “Stationary test” and
check the operating sound.
2. Start the engine, and then check the
engine speed increases using the YDIS
“Active test”.
3. Disconnect the ISC valve coupler “a”.
4. Turn the engine start switch to ON, and
then measure the ISC valve input voltage
at the ISC valve coupler terminal and
ground.
Engine ECM input voltage
(reference data):
Terminal 13–Ground
11.2 V
13
F
N
R
a
b
TPS output voltage and throttle
valve opening angle (reference data):
Item Fully closed “a” Fully open “b”
Output
voltage
0.703 V 4.033 V
Opening
angle
0.1° 83.2°
TPS input voltage:
Orange (O)–Black (B)
4.75–5.25 V
O
B
a