Checking The Throttle Position Sensor; Checking The Intake Air Temperature Sensor; Checking The Engine Temperature Sensor - Yamaha F150A Service Manual

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ELEC
Checking the throttle position
sensor
1. Remove the flywheel magnet cover.
2. Connect the test harness (3 pins) to the
throttle position sensor.
3. Turn the engine start switch to ON.
4. Measure the throttle position sensor
input voltage. Check the wiring harness
connection or replace the ECM if out of
specification.
5. Measure the throttle position sensor out-
put voltage. Adjust the throttle position
sensor if out of specification.
NOTE:
To measure the output voltage, connect the
positive tester probe to the pink wire of the
test harness and the negative tester probe to
the orange wire of the test harness.
Digital circuit tester: 90890-03174
Test harness (3 pins): 90890-06793
Throttle position sensor input
voltage:
Orange (O) – Black (B)
5 V
Throttle position sensor output
voltage:
Pink (P) – Black (B)
0.70 ± 0.02 V
8-13
Electrical systems
S63P8130
Checking the intake air temperature
sensor
1. Place the intake air temperature sensor
in a container of water and slowly heat
the water.
2. Measure the intake air temperature sen-
sor resistance. Replace if out of specifi-
cation.
Intake air temperature sensor
resistance:
at 20 °C (68 °F): 2.20–2.70 kΩ
Checking the engine temperature
sensor
1. Place the engine temperature sensor in a
container of water and slowly heat the
water.
2. Measure the engine temperature sensor
resistance. Replace if out of specifica-
tion.
Engine temperature sensor
resistance:
Black/yellow (B/Y) –
Black/yellow (B/Y)
at 20 °C (68 °F): 54.2–69.0 kΩ
at 100 °C (212 °F): 3.12–3.48 kΩ
S69J8230
S69J8240
63P3F11